LM2596
G
ENERAL
DESCRIPTION
The LM2596 series of regulators are monolithic integrated
circuits that provide all the active functions for a step-down
(buck) switching regulator, capable of driving a 3A load with
excellent line and load regulation. These devices are available
in fixed output voltages of 3.3V, 5V, 12V, and an adjustable
output version.
Requiring a minimum number of external components, these
regulators are simple to use and include internal frequency
compensation, and a fixed-frequency oscillator.
The LM2596 series operates at a switching frequency of 150
kHz thus allowing smaller sized filter components than what
would be needed with lower frequency switching regulators.
Available in a standard 5-lead TO-220 package with several
different lead bend options, and a 5-lead TO-263 surface mount
package.
A standard series of inductors are available from several
different manufacturers optimized for use with the LM2596
series. This feature greatly simplifies the design of switch-mode
power supplies.
Other features include a guaranteed 4% tolerance on output
voltage under specified input voltage and output load
conditions, and 15% on the oscillator frequency. External
shutdown is included, featuring typically 80 µA standby
current. Self protection features include a two stage frequency
reducing current limit for the output switch and an over
temperature shutdown for complete protection under fault
conditions.
FEATURES
3.3V, 5V, 12V, and adjustable output versions
Adjustableversionoutputvoltagerange,1.2V to37V
4% max over line and load conditions
Available in TO-220 and TO-263 packages
Guaranteed 3A output load current
Input voltage range up to 40V
Requires only 4 external components
Excellent line and load regulation specifications
150 kHz fixed frequency internal oscillator
TTL shutdown capability
Low power standby mode, IQtypically 80 µA
High efficiency
Uses readily available standard inductors
Thermal shutdown and current limit protection
APPLICATIONS
Simplehigh-efficiencystep-down (buck)regulator
On-card switching regulators
Positi
v
e
to n
e
g
a
ti
v
e
c
on
v
e
rt
e
r
TYPICAL
APPLICATION
(Fixed Output Voltage Versions)
4
1
2
V
+
V
IN
L1
5.
0V
+
C
IN
1
5
5
.
0
3
2
+
C
OUT
6
80
F
2
2
0
F
B
L
OCK DIA
G
RAM
O
N
/
O
F
F
2.
5
V
STAR
T
UP
+
COM
-
+
+
V
IN
FE
E
D
B
A
C
K
R2
+
GM
-
COM
+
A
ct
i
ve
A
M
P
-
-
+
L
A
T
C
H
D
R
I
V
E
R
c
a
p
a
c
i
tor
+
-
O
U
T
P
U
T
1
50
k
H
z
O
S
C
G
N
D
BEIJING ESTEK ELECTRONICS CO.,LTD
1
LM2596
PIN FUNCTIONS
+VIN - This is the positive input supply for the IC switching
regulator. A suitable input bypass capacitor must be present at
this pin to minimize voltage transients and to supply the
switching currents needed by the regulator.
Ground - Circuit ground.
Output - Internal switch. The voltage at this pin switches
between (+VIN - VSAT ) and approximately -0.5V, with a duty
cycle of approximately VOUT /VIN. To minimize coupling to
sensitive circuitry, the PC board copper area connected to this
pin should be kept to a minimum.
Feedback — Senses the regulated output voltage to complete
the feedback loop.
ON/OFF - Allows the switching regulator circuit to be shut
down using logic level signals thus dropping the total input
supply current to approximately 80 µA. Pulling this pin below a
threshold voltage of approximately 1.3V turns the regulator on,
and pulling this pin above 1.3V (up to a maximum of 25V) shuts
the regulator down. If this shutdown feature is not needed, the
ON /OFF pin can be wired to the ground pin or it can be left
op
e
n, in
e
ith
e
r
case
th
e
r
e
g
ul
a
tor
w
ill b
e
in th
e
ON
c
ondition.
A
B
SOLUTE
M
AXI
M
U
M
RATIN
G
S
(
N
o
t
e
1)
Maximum Supply Voltage 45V
ON /OFF Pin Input Voltage -0.3
V
+25V
Feedback Pin Voltage -0.3
V
+25V
Output Voltage to Ground
(Steady State) -1V
Power Dissipation Internally limited
0C to +1500CStorage Temperature Range -65
ESD Susceptibility
Human Body Model (Note 2) 2 kV
Lead Temperature
S Package
Vapor Phase (60 sec.) +2150C
Infrared (10 sec.) +2450C
T Package (Soldering, 10 sec.) +2600C
Maximum Junction Temperature +1500C
OPERATING CONDITIONS
T
e
m
p
era
tur
e
Ra
n
g
e
-
40
0
C
T
J
+
12
5
0
C
L
M
2596
-
3.
3
ELECTRICAL CHARACTERISTICS
Specifications with standard type face are for TJ= 250C, and those with boldface type apply over full Operating Temperature
Ra
n
g
e
Sy
m
b
o
l
P
a
ra
m
ete
r
Co
nd
i
t
i
o
n
s
T
y
p
L
M
2596
-
3.
3
Li
m
it
U
n
its
S
Y
S
TE
M
PARA
M
ETER
S
(
N
ot
e
5)
T
es
t
C
ir
c
uit Fi
g
ur
e
1
(
N
ot
e
3
)
(
N
ot
e
4
)
(Li
m
its)
VOUT Output Voltage 4.7V5
V
I
N
40V, 0.2A
I
L
O
A
D
3A 3.3
3.168
/
3.13
5
3.432
/
3.46
5
V
V(min
)
V
(
m
a
x
)
Efficiency VIN=12V, ILOAD=3A
73 %
LM2596-5.0
ELECTRICAL CHARACTERISTICS
Specifications with standard type face are for T
J
= 250C, and those with boldface type apply over full Operating Temperature
Ra
n
g
e
Sy
m
b
o
l
P
a
ra
m
ete
r
Co
nd
i
t
i
o
n
s
T
y
p
L
M
2596
-
5.
0
Li
m
it
U
n
its
S
Y
S
TE
M
PARA
M
ETER
S
(
N
ot
e
5)
T
es
t
C
ir
c
uit Fi
g
ur
e
1
(
N
ot
e
3
)
(
N
ot
e
4
)
(Li
m
its)
V
OUT
Output
Volt
a
g
e
7
V
V
I
N
40V,
0.2
A
I
L
O
A
D
3
A
5.
0
4.800
/
4.75
0
5.200
/
5.25
0
V
V(min
)
V
(
m
a
x
)
Efficiency VIN=12V, ILOAD=3A
80 %
LM2596-12
ELECTRICAL CHARACTERISTICS
Specifications with standard type face are for T
J
= 250C, and those with boldface type apply over full Operating Temperature
Ra
n
g
e
Sy
m
b
o
l
P
a
ra
m
ete
r
Co
nd
i
t
i
o
n
s
T
y
p
L
M
2596
-
1
2
Li
m
it
U
n
its
S
Y
S
TE
M
PARA
M
ETER
S
(
N
ot
e
5)
T
es
t
C
ir
c
uit Fi
g
ur
e
1
(
N
ot
e
3
)
(
N
ot
e
4
)
(Li
m
its)
V
OUT
Output
Volt
a
g
e
15
V
V
I
N
40V,
0.2
A
I
L
O
A
D
3
A
12.
0
11.52
/
11.4
0
12.48
/
12.6
0
V
V(min
)
V
(
m
a
x
)
Efficiency VIN=12V, ILOAD=3A
90 %
LM2596-ADJ
ELECTRICAL
C
H
ARACTERISTICS
2
BEIJING ESTEK ELECTRONICS CO.,LTD
LM2596
Specifications with standard type face are for TJ= 250C, and those with boldface type apply over full Operating
Te
m
p
erat
u
re
Ra
n
g
e
L
M
2596
-
AD
J
Sy
m
b
o
l
P
a
ra
m
ete
r
Co
nd
i
t
i
o
n
s
T
y
p
(
N
ot
e
3
)
Li
m
it
(
N
ot
e
4
)
U
n
its
(Limits)
S
Y
S
TE
M
PARA
M
ETER
S
(
N
ot
e
5)
T
es
t
C
ir
c
uit Fi
g
ur
e
1
VOUT Output Voltage 4.5V
VIN
40V, 0.2A
ILOAD
3A
VOUT programmed for 3V. Circ
uit of
Fi
g
ur
e
1.
1.23
0
1.193
/
1.18
0
1.267
/
1.28
0
V
V(min
)
V
(
m
a
x
)
E
ff
i
c
i
e
n
c
y
V
I
N
=
12V,
V
OU
T
=
3V, I
L
O
A
D
=
3
A
ALL OUTPUT VOLTAGE VERSIONS
ELECTRICAL CHARACTERISTICS
Specifications with standard type face are for TJ= 250C, and those with boldface type apply over full Operating Temperature
Range. Unless otherwise specified, VIN = 12V for the 3.3V, 5V, and Adjustable version and VIN = 24V for the 12V version. ILOAD
=
500
m
A
L
M
2596
-
X
X
Sy
m
b
o
l
P
a
ra
m
ete
r
Co
nd
i
t
i
o
n
s
T
y
p
(
N
ot
e
3
)
Li
m
it
(
N
ot
e
4
)
U
n
its
(Limits)
DE
V
ICE
PARA
M
ETERS
IbFeedback Bias Current Adjustable Version Only, VFB=1.3V 10
fOOscillator Frequency (Note 6) 150
V
S
A
T
S
a
tur
a
tion
Volt
a
g
e
I
OU
T
=
3
A
(
N
ot
es
7, 8)
1.16
50
/
10
0
127/110
173/173
1.4
/
1.5
n
A
nA (max)
kHz
kHz (min)
kHz (max)
V
V
(
m
a
x
)
DC Max Duty Cycle
(ON)
Min
D
ut
y
C
y
c
l
e
(O
FF
)
(
N
ot
e
8
)
(
N
ot
e
9
)
10
0
0
%
I
C
L
C
urr
e
nt
L
i
m
it
P
ea
k
C
urr
e
nt (
N
ot
es
7, 8)
4.5
3.6
/
3.4
6.9
/
7.5
A
A (m
in)
A (max)
I
L
O
utput
L
eakage
C
u
rre
n
t
O
u
tput
=
0
V
(
N
ot
es
7,
9
)
5
0
A
(
m
a
x
)
O
u
tput
=
-
0.9V
(
N
ot
e
10
)
1
0
I
Q
Quiescent Current (Note 9) 5
3
0
1
0
mA
mA (max)
mA
m
A
(
m
a
x
)
ISTBY Standby
Q
ui
esce
nt
ON
/
O
FF pin
=
5V (
O
FF) (
N
ot
e
10)
80
200
/
25
0
A
A (max)
0
C/W
JC Thermal Resistance TO-220orTO-263Package,JunctiontoCase 2
JA TO-220Package,JunctiontoAmbient(Note11) 50
JA TO-263Package,JunctiontoAmbient(Note12) 50
JA TO-263Package,JunctiontoAmbient(Note13) 30
JA TO-263Package,JunctiontoAmbient(Note14) 20
ON/OFF CONTROL
T
e
st Circuit Fi
g
ure 1
0C/W
0C/W
0C/W
0C/W
V
IH
VIL
ON
/
O
FF
P
in
L
o
g
i
c
I
nput
Threshold Voltage Low (Regulator ON)
High (Regulator OFF)
1.
3
0.
6
2.0
V
V (max
)
V (min)
IH
VON/OFF Pin Input Current LOGIC=2.5V (Regulator OFF) 5
V
L
OG
I
C
=
0
.5V
(
Re
g
ul
a
t
o
r
ON
)
0.0
2
1
5
5
A
A (max)
A
A
(
m
a
x
)
Note
1:
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate
conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed
specifications and test conditions, see the Electrical Characteristics.
Note 2: The human body model is a 100 pF capacitor discharged through a 1.5k resistor into each pin.
Note 3: Typical numbers are at 250C and represent the most likely norm.
Note 4: All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). All room
temperature limits are 100% production tested. All limits at temperature extremes are guaranteed via correlation using standard
Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).
Note 5: External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors ca
n
affect switching regulator system performance. When the LM2596 is used as shown in the Figure 1 test circuit, system performan
ce
w
ill b
e
as
sho
w
n in s
y
st
e
m
p
a
r
a
m
e
t
e
rs s
ec
tion o
f
El
ec
tri
ca
l Ch
a
r
ac
t
e
risti
c
s.
BEIJING ESTEK ELECTRONICS CO.,LTD
3
LM2596
Note
6:
The switching frequency is reduced when the second stage current limit is activated. The amount of reduction is
determined by the severity of current over-load.
Note 7: No diode, inductor or capacitor connected to output pin.
Note 8: Feedback pin removed from output and connected to 0V to force the output transistor switch ON.
Note 9: Feedback pin removed from output and connected to 12V for the 3.3V, 5V, and the ADJ. version, and 15V for the 12V
version, to force the output transistor switch OFF.
Note 10: VIN = 40V.
Note 11: Junction to ambient thermal resistance (no external heat sink) for the TO-220 package mounted vertically, with the leads
soldered to a printed circuit board with (1 oz.) copper area of approximately 1 in2
Note 12: Junction to ambient thermal resistance with the TO-263 package tab soldered to a single printed circuit board with 0.5 in2
of (1 oz.) copper area.
Note 13: Junction to ambient thermal resistance with the TO-263 package tab soldered to a single sided printed circuit board with
2.5 in2of (1 oz.) copper area.
Note 14: Junction to ambient thermal resistance with the TO-263 package tab soldered to a double sided printed circuit board with
3 in2of (1 oz.) copper area on the LM2596S side of the board, and approximately 16 in2of copper on the other side of the p-c
bo
a
rd.
TYPICAL
PERFOR
M
ANCE
CHARACTERISTIC
S
(Cir
c
uit o
f
Fi
g
ur
e
1)
Nor
m
a
li
ze
d
O
u
t
pu
t
V
o
lt
a
ge
L
i
n
e
Re
g
u
l
a
t
i
o
n
Eff
i
c
i
e
n
cy
1
.
5
1.0
0.5
0
-
0.5
0
.4
0.3
0.2
0.1
0
-0.1
-
0.2
9
5
90
85
80
75
5
V
12
V
20
V
-
1.0
-
0.3
7
0
-
0.
4
-50 -25 0 25 50 75
0 5 10 15 20 25 30
35 40
I
N
P
U
T
V
O
L
T
A
G
E
(
V
)
6
5
0
5
1
0
1
5
2
0
2
5
3
0
35 40
Swit
c
h
S
a
t
u
r
a
ti
o
n
V
o
lt
a
ge
Switch Current Limit Dropout Voltage
1.
4
1.
3
V
I
N
=
12
V
5
.5
V
=12V
IN
V
=
5V
1.6
1.
2
1.1
1.0
0.9
0.8
0
T
=
0
-40 C
5
.0
4.5
4
.0
O
U
T
1
.4
1.2
1.0
0.8
I
=
I
=
LOAD
1A
3A
0
.7
0
.6
2
5
C
0
12
5
C
3
.5
0.6
0
1
2
3
4
SW
I
T
C
H
C
U
RR
E
NT
(
A
)
-
50
-
25
0
2
5
5
0
7
5
-
50
-
25
0
2
5
5
0
75
4
BEIJING ESTEK ELECTRONICS CO.,LTD
LM2596
TYPICAL
PERFOR
M
ANCE
CHARACTERISTIC
S
(
C
ir
c
uit o
f
Fi
g
ur
e
1) (
C
ontinu
e
d)
2
4
2
0
O
p
erat
i
n
g
Quiescent Current
I
=
0
1
20
1
00
S
hu
t
do
w
n
Quiescent Current
_
V
5V
5
Mi
n
i
m
u
m
O
p
er
a
ti
n
g
Supply Voltage
16
12
8
4
0
80
60
40
20
0
T
=
0
25
C
4
3
2
1
0
-
50
-
25
0
2
5
50
7
5
0
10 20 30 40
S
UP
P
L
Y
V
O
L
T
A
G
E
(
V
)
-
50
-
25
0
2
5
5
0
7
5
2
.5
2.0
1.5
1.0
0
.5
ON
/
O
FF T
h
res
ho
ld
Voltage
OFF
ON
8
7
6
5
4
3
2
1
ON
/
O
FF Pin
Current (Sinking) Switching Frequency
160
155
150
145
140
135
130
-
50
-
25
0
2
5
5
0
75
0
0
1
0
1
5
2
0
2
5
-
50
-
25
0
2
5
5
0
7
5
O
N/
O
F
P
I
N
V
O
L
T
A
G
E
(
V
)
Feedback Pin
Bi
as
C
u
rre
n
t
1
0
7
.5
5
.0
2
.5
A
D
J
U
S
T
A
B
L
E
V
E
R
S
I
O
N
O
N
L
Y
0
-
2.5
-
5.0
-50 -25 0 25 50
7
5
BEIJING ESTEK ELECTRONICS CO.,LTD
5
LM2596
TYPICAL
PERFOR
M
ANCE
CHARACTERISTICS
C
on
ti
nuou
s
M
od
e
Swit
c
h
i
n
g
Wav
e
f
o
r
m
s
VIN=20V, VOUT=5V, ILOAD=2A
L=32
H, COUT=220
F, COUTESR=50m
2
0
V
Discontinuous Mode Switching Waveforms
VIN=20V, VOUT=5V, ILOAD=500mA L=10
H
,
COUT=330
F, COUTESR=45m
2
0
V
A
B
1
0
V
0V
2A
1A
0A
A
B
1
0
V
0V
1A
0A
C
AC/
d
i
v
C
A
C
/
d
iv
A
:
O
u
tp
u
t
P
i
n
V
o
l
t
a
g
e
,
1
0
V
/
d
i
v
B: Inductor Current 1A/div
C: Output Ripple Voltage,50mV/div
H
o
r
i
z
o
n
ta
l
T
i
m
e
B
a
s
e:
2
s
/
d
i
v
A
:
O
u
tput
P
i
n
V
o
l
tage
,
1
0
V
/
d
i
v
B: Inductor Current 1A/div
C: Output Ripple Voltage,100mV/div
H
o
r
i
z
o
n
ta
l
T
i
m
e
B
a
s
e:
2
s
/
di
v
Load Transient Response for Continuous Mode
VIN=20V, VOUT=5V, ILOAD=500mA to 2A
L=32
H
,
C
OU
T
=22
0
F,
C
OU
T
E
S
R
=
50
m
L
oad
Tr
ans
i
en
t
Response
f
or
D
i
scon
ti
nuous
M
ode
VIN=20V, VOUT=5V, ILOAD=500mA to 2A
L=10
H, C
OU
T
=330
F, C
OU
T
ESR=45m
A
AC
d
iv
A
AC
d
i
v
B
1A
0A
B
1A
0A
A: Output Voltage,100mV/div.(AC)
B
:
5
0
0m
A
t
o
2A
L
o
a
d
P
u
l
s
e
A: Output Voltage,100mV/div. (AC)
B
:
5
0
0
mA
t
o
2
A
L
o
a
d
P
ul
s
e
H
ori
zo
n
ta
l
T
i
m
e
B
a
s
e:
100
s
/
di
v
H
o
r
izo
n
tal
T
i
m
e
B
a
s
e:
200
s
/
d
i
v
6
BEIJING ESTEK ELECTRONICS CO.,LTD
LM2596
TEST
CIRCUIT
AND
LAYOUT
G
U
IDELINES
F
i
x
ed
O
u
t
p
u
t
V
o
l
t
a
ge
V
er
s
i
o
ns
+
+V
IN
+C
IN
3
4
5
2
L1
+
C
OUT
L1
+
C
IN
-
4
7
0
F
,
5
0
V
,
A
lum
i
nu
m
E
l
e
ctr
o
l
y
t
i
c
N
i
ch
i
c
o
n
“
P
L
S
e
r
i
e
s
”
C
OUT
- 220 F
,25V,Aluminum Electrolytic Nichicon “PL
S
er
i
e
s
”
D
1
-
5
A
,
40V
S
c
h
ottky
R
ectifer
,
1
N
58
2
5
L
1
-
68
H
,
L
3
8
A
d
j
u
s
t
a
b
l
e
Ou
t
p
u
t
V
o
l
t
a
g
e
V
er
s
i
o
n
s
C
FF
R
1
R2
+
+V
IN
+C
IN
3
4
5
2
L1
+
C
OUT
V
=
R
2
V (
REF
1+ )
R
1
w
here V
REF
=1.23V
V
OUT
R=R (
2
-
1
)
S
e
l
ect
R
1
to
b
e
a
ppr
o
x
i
m
a
t
e
ly
1
k
,
u
se
a
1
%
r
e
s
i
s
t
o
r
for
be
s
t
st
a
bi
li
t
y
.
C
IN
-
4
7
0
F
,
5
0
V
,
A
l
u
m
in
u
m
E
l
e
c
tro
l
y
t
i
c
N
ich
i
c
o
n
“
P
L
S
e
r
i
e
s”
C
OUT
- 220 F
,35V,Aluminum Electrolytic Nichicon “PL
S
e
r
i
e
s
”
D
1
-
5
A
,
40V
S
c
h
o
t
t
k
y
R
e
c
tifer
,
1
N
58
2
5
L
1
-
68
H
,
L
3
8
R
1
-
1
k
,
1
%
C
s
ee
A
pp
li
c
a
t
i
on
I
nfor
m
a
t
i
on
Sect
i
o
n
Fi
g
ur
e
1. St
a
nd
a
rd
T
es
t
C
ir
c
uit
s
a
nd
L
a
y
out
G
uid
e
s
As in any switching regulator, layout is very important. Rapidly switching currents associated with wiring inductance can generat
e
voltage transients which can cause problems. For minimal inductance and ground loops, the wires indicated by heavy lines shoul
d
be wide printed circuit traces and
should be kept as short as possible. For best results, external components should be located as close to the switcher lC as possible
using ground plane construction or single point grounding.
If open core inductors are used, special care must be taken as to the location and positioning of this type of inductor. Allowing
the inductor flux to intersect sensitive feedback, lC groundpath and COUT wiring can cause problems.
When using the adjustable version, special care must be taken as to the location of the feedback resistors and the associated wiring.
Ph
y
s
i
ca
ll
y
lo
ca
t
e
both r
es
i
s
tor
s
n
ea
r th
e
I
C
,
a
nd rout
e
th
e
w
irin
g
a
w
a
y
f
ro
m
th
e
indu
c
tor,
es
p
ec
i
a
ll
y
a
n op
e
n
c
or
e
t
y
p
e
o
f
indu
c
tor
.
7
BEIJING ESTEK ELECTRONICS CO.,LTD
LM2596
L
M2596
SE
R
IES
BUCK R
E
G
U
L
A
T
OR D
ESI
G
N PROC
E
DUR
E
(F
I
X
E
D OU
T
PU
T
)
PROCEDURE
(Fi
x
e
d
O
u
t
pu
t
V
o
lta
g
e
V
ersio
n
)
E
X
A
MP
LE
(
Fix
e
d
O
u
t
pu
t
V
o
lt
a
g
e
V
ers
i
on
)
Given:
Given:
VOUT = Regulated Output Voltage (3.3V, 5V or 12V) VOUT =5V
VIN (max) = Maximum DC Input Voltage VIN (max) = 12V
I
(
m
a
x
)
=
Ma
x
i
m
u
m
L
o
a
d
C
u
rre
nt
I
(
m
a
x
)
=
3
A
1.
I
ndu
c
t
o
r
S
e
l
ec
ti
on
(
L
1)
1.
I
ndu
c
t
o
r
S
e
l
ec
ti
on
(
L
1
)
A
.
S
e
l
ec
t th
e
c
orr
ec
t indu
c
tor
v
a
lu
e
se
l
ec
tion
g
uid
e
f
ro
m
Fi
g
ur
e
s
Figure 4, Figure 5,or Figure 6. (Output voltages of 3.3V, 5V, or
12V respectively.) For all other voltages, see the design procedure
for the adjustable version.
B. From the inductor value selection guide, identify the inductance
region intersected by the Maximum Input Voltage line and the
Maximum Load Current line. Each region is identified by an
inductance value and an inductor code (LXX).
C. Select an appropriate inductor from the four manufacturer’s part
numbers listed in Figure 8.
A
.
Use
th
e
indu
c
tor
se
l
ec
tion
g
uid
e
f
or th
e
5V
v
e
r
s
ion
s
ho
w
n in Fi
g
ur
e
5.
B. From the inductor value selection guide shown in Figure 5, the
inductance region intersected by the 12V horizontal line and the 3A
vertical line is 33 µH, and the inductor code is L40.
C. Theinductancevaluerequiredis33 µH. FromthetableinFigure8,go tothe
L40 lineandchoose aninductorpartnumber fromanyofthefourmanufacturers
shown. (Inmost in-stance,boththroughholeandsurfacemount inductorsare
available.)
2.
O
u
t
pu
t
Ca
pa
c
i
tor
S
e
l
ect
i
on
(C
OU
T
)
2.
O
u
t
pu
t
Ca
pa
c
i
tor
S
e
l
ect
i
on
(C
OU
T
)
A
.
In the majority of applications, low ESR (Equivalent Series
Resistance) electrolytic capacitors between 82 µF and 820 µF and
low ESR solid tantalum capacitors between 10 µF and 470 µF
provide the best results. This capacitor should be located close to
the IC using short capacitor leads and short copper traces. Do not
use capacitors larger than 820 µF.
B. To simplify the capacitor selection procedure, refer to the quick
design component selection table shown in Figure 2. This table
contains different input voltages, output voltages, and load
currents, and lists various inductors and output capacitors that will
pro
v
id
e
th
e
b
es
t d
es
i
g
n
s
olution
s
.
A
. S
ee
sect
i
on
o
n
o
u
t
pu
t
ca
pa
c
i
tors
i
n
a
pp
li
cat
i
on
i
n
for
m
at
i
on
sect
i
on
.
B.Fromthequickdesigncomponentselectiontableshown inFigure2,locatethe
5Voutput voltagesection.Intheloadcurrentcolumn, choosetheloadcurrentline
thatisclosest tothecurrentneeded inyourapplication,forthisexample, usethe3A
line.In themaximuminputvoltagecolumn,select thelinethat coverstheinput
voltageneeded inyour application,inthisexample,usethe15Vline.Continuingon
thislinearerecommendedinductorsand capacitorsthatwillprovidethebestoverall
performance.
Thecapacitorlistcontainsboththrough holeelectrolyticandsurfacemount tantalum
capacitorsfromfourdifferentcapacitormanufacturers.Itisrecommendedthatboth
themanufacturersandthemanufacturer’sseriesthatarelistedinthetablebeused.
Inthisexamplealuminumelectrolyticcapacitorsfromseveral different
manufacturersareavailablewith therangeofESRnumbersneeded.
330µF35VPanasonicHFQSeries
330µF35VNichiconPLSeries
C
.
T
h
e
ca
p
ac
itor
v
olt
a
g
e
r
a
tin
g
f
or
e
l
ec
trol
y
ti
c
ca
p
ac
itor
s
s
hould be
C
.
F
o
r
a
5V
ou
t
pu
t,
a
ca
p
ac
it
o
r
v
o
lt
age
ra
ti
n
g
a
tl
eas
t
7
.
5V
o
r
m
o
re
i
s
n
ee
d
e
d
.
B
u
t
at least 1.5 times greater than the output voltage, and often much
higher voltage ratings are needed to satisfy the low ESR
r
e
quir
e
m
e
nt
s
f
or lo
w
output rippl
e
v
olt
a
g
e
.
evenalowESR, switchinggrade,220µF10V aluminumelectrolyticcapacitor
would exhibitapproximately225 mWofESR(seethe curveinFigure 14forthe
ESRvsvoltagerating).ThisamountofESRwouldresultin relativelyhighoutput
ripplevoltage. To reducetherippleto1%oftheoutputvoltage,orless, acapacitor
with ahighervalueorwith ahighervoltagerating(lowerESR)should beselected.
A
16
V
or25
V
ca
p
ac
itor
w
illr
e
du
ce
th
e
rippl
e
v
o
lt
-
a
g
e
b
y
a
ppro
x
i
m
a
t
e
l
y
h
a
l
f
.
3.
Catc
h
D
i
o
d
e
S
e
l
ect
i
on
(D
1)
3.
Catc
h
D
i
o
d
e
S
e
l
ect
i
on
(D
1
)
A.
T
h
e
ca
t
c
h
d
i
od
e
c
u
rre
n
t
ra
ti
n
g
m
u
s
t
b
e
a
tl
eas
t
1
.
3
ti
m
es
grea
t
er
t
h
a
n
t
h
e
A.
Re
f
er
to th
e
t
a
bl
e
s
ho
w
ninFi
g
u
re
11.
I
n
thi
s
e
x
a
m
pl
e
,
a
5
A
,20V,1
N
5823
m
a
x
i
m
u
m
lo
a
d
c
u
rre
nt.
A
l
s
o
,i
f
th
e
po
w
er
s
uppl
y
d
es
i
g
n
m
u
s
t
w
ith
s
t
a
nda
S
c
hott
k
y
diod
e
w
illpro
v
id
e
th
e
b
e
stp
e
r
f
or
m
a
n
ce
,
a
nd
w
illnotb
e
o
v
er
str
e
ss
e
d
e
v
e
n
c
ontinuou
s
output
s
ho
r
t,th
e
diod
e
s
houldh
a
v
e
a
c
u
rre
nt
ra
tin
g
e
qu
a
ltoth
e
f
o
r
a
s
ho
r
t
e
doutput.
maximumcurrentlimitoftheLM2596.Themost stressfulconditionfor
thisdiodeisanoverloadorshortedoutput condition.
B.Thereversevoltageratingofthediode shouldbeat least 1.25timesthe
maximuminput voltage.
C. This diodemustbefast(short reverserecoverytime)andmust belocated
closetotheLM2596usingshortleadsand short printedcircuittraces.
Becauseoftheirfastswitchingspeed andlowforwardvoltagedrop,
Schottkydiodesprovidethebestperformanceand efficiency,andshouldbe
thefirstchoice,especiallyinlowoutputvoltageapplications.
Ultra-fastrecovery,orHigh-Efficiencyrectifiersalsoprovidegoodresults.
Ultra-fastrecoverydiodestypicallyhavereverserecoverytimes of50nsor
less.Rectifierssuch asthe1N5400seriesare muchtooslowand should not
b
e
u
se
d
.
8
BEIJING ESTEK ELECTRONICS CO.,LTD
LM2596
PROCEDURE
(Fi
x
e
d
O
u
t
pu
t
V
o
lta
g
e
V
ersio
n
)
E
X
A
MP
LE
(
Fix
e
d
O
u
t
pu
t
V
o
lt
a
g
e
V
ers
i
on
)
4.InputCapacitor(C
I
N
) 4.InputCapacitor(C
I
N
)
A
lowESRaluminumortantalumbypasscapacitorisneededbetweenthe
inputpinand groundpin topreventlargevolt-agetransientsfromappearing
a
tth
e
input.
T
h
i
s
ca
p
ac
ito
r
s
houldb
e
lo
ca
t
e
d
c
lo
se
toth
e
I
C
T
h
e
i
m
po
r
t
a
ntp
ara
m
e
t
ers
f
o
r
th
e
I
nput
ca
p
ac
ito
r
are
th
e
input
v
o
lt
a
g
e
ra
tin
g
a
ndthe
RMScurrent rating. Withanominal
input
v
o
lt
a
g
e
o
f
12V,
a
n
a
lu
m
inu
m
e
l
ec
t
r
o
l
y
ti
c
ca
p
ac
ito
r
w
ith
a
v
o
lt
a
g
e
ra
ting
u
s
in
g
s
ho
r
tl
ea
d
s
.
I
n
a
ddition,th
e
R
MS
c
u
rre
nt
ra
tin
g
o
f
th
e
input
ca
p
ac
ito
r
grea
t
er
t
h
a
n
18V
(
1
.
5
x
V
I
N
)
w
ou
l
d
b
e
n
ee
d
e
d
.
T
h
e
n
ex
t
h
i
g
h
er
ca
p
ac
it
o
r
v
o
lt
age
shouldbeselectedtobeatleast1/2the DCload current.Thecapacitor
manufacturers datasheet must be checked toassurethat this currentrating
isnotexceeded.Thecurveshown inFigure9showstypicalRMScurrent
ratingsfor severaldifferentaluminumelectrolyticcapacitorvalues.
Foranaluminumelectrolytic,thecapacitorvoltageratingshouldbe
approximately1.5timesthemaximuminput voltage.
Thetantalumcapacitorvoltageratingshouldbe2timesthemaximum
inputvoltageanditisrecommendedthat theybesurgecurrenttestedby
themanufacturer.
Usecautionwhenusingceramiccapacitorsforinputbypassing,becauseit
m
a
y
ca
u
se
severe
r
i
n
g
i
n
g
a
tt
h
e
V
I
N
pin.
r
a
tin
g
is25
V
.
TheRMScurrentratingrequirementfortheinputcapacitorin
abuckregulatorisapproximately1 /2theDC load current.In thisexample,with a
3Aload,acapacitorwithaRMScurrentratingofat least 1.5Aisneeded.The
curvesshowninFigure9canbeusedtoselectanappropriateinputcapacitor.
Fromthecurves,locatethe35Vlineandnotewhich capacitorvalueshaveRMS
currentratingsgreaterthan1.5A. A680µF/35V capacitorcouldbeused.
Forathroughholedesign,a680µF/35Velectrolyticcapacitor(PanasonicHFQ
seriesorNichiconPLseries orequivalent)wouldbeadequate.othertypesorother
manufacturerscapacitorscan beusedprovided theRMS ripplecurrent ratingsare
adequate.
Forsurface mountdesigns,solidtantalumcapacitorscan beused,butcautionmust
beexercised withregardtothecapacitorsurgecurrent rating.TheTPSseries
availablefromAVX,andthe593DseriesfromSpraguearebothsurgecurrent
teste
d
.
L
M2596
SE
R
IES
BUCK R
E
G
U
L
A
T
OR D
ESI
G
N PROC
E
DUR
E
(F
I
X
E
D OU
T
PU
T
)
(
C
o
n
ti
nu
e
d
)
C
ond
i
t
i
on
s
I
ndu
ct
or
Ou
t
pu
t
C
apa
c
i
t
or
T
h
ro
u
g
h
Ho
l
e
E
l
ectro
l
y
t
i
c
S
u
rface
M
oun
t
Ta
n
ta
l
u
m
Ou
t
put
Voltage
(V)
L
oad
Current
(A)
M
a
x
I
nput
Voltage(V)
I
ndu
ct
an
c
e
(
H)
I
ndu
ct
or
(#)
P
ana
s
on
i
c
HFQSeries
(
F/
V
)
NichiconPL
S
er
i
es
(
F/
V
)
AVXTP
S
Series
(
F/
V
)
S
p
r
a
g
u
e
595
D
S
er
i
e
s
(
F/V)
3.3
5
12
3
2
3
2
3
2
5
2
2
L
4
1
470/2
5
560/1
6
330/6.
3
390/6.3
7 22 L41 560/35 560/35 330/6.3
390/6.3
10 22 L41 680/35 680/35 330/6.3
390/6.3
40 33 L40 560/35 470/35 330/6.3
390/6.3
6 22 L33 470/25 470/35 330/6.3
390/6.3
10 33 L32 330/35 330/35 330/6.3
390/6.3
40 47 L39 330/35 270/50 220/10
330/10
8 22 L41 470/25 560/16 220/10
330/10
10 22 L41 560/25 560/25 220/10
330/10
15 33 L40 330/35 330/35 220/10
330/10
40 47 L39 330/35 270/35 220/10
330/10
9 22 L33 470/25 560/16 220/10
330/10
L
M2596
SE
R
IES
BUCK R
E
G
U
L
A
T
OR D
ESI
G
N PROC
E
DUR
E
(ADJU
ST
AB
LE
OU
T
PU
T
)
PROCEDURE (Adjustable Output Voltage Version) EXAMPLE (Adjustable Output Voltage Version)
Given:
Given:
VOUT = Regulated Output Voltage VOUT = 20V
VIN(max) = Maximum Input Voltage VIN(max) = 28V
ILOAD(max) = Maximum Load Current ILOAD(max) = 3A
F
=
S
w
it
c
hin
g
Fr
e
qu
e
n
c
y
(Fi
x
e
d
a
t
a
no
m
in
a
l 150
k
Hz
).
F
=
S
w
it
c
hin
g
Fr
e
qu
e
n
c
y
(Fi
x
e
d
a
t
a
no
m
in
a
l 150
k
Hz
).
1. P
r
o
g
r
a
mm
i
n
g
Ou
t
pu
t
V
o
lt
a
ge
(Selecting R1and R2, as shown in
Figure 1)
Use the following formula to select the appropriate resistor values.
V
OUT
V
REF
(1R
2
)
1. Programming Output Voltage (Selecting R1and R2, as shown
in Figure 1)
S
e
l
ec
t
R
1
to b
e
1
k
, 1
%
. Sol
v
e
f
or R
2
.
R
1
w
h
e
re
V
REF
1.23
V
R
2
R
1
(
V
OUT
1)
1k(
20
V
Select a value for R1between 240
and 1.5k
. The lower resistor
v
a
lu
es
m
ini
m
i
ze
nois
e
pi
c
k
up in th
e
s
e
nsiti
v
e
f
ee
db
ac
k
pin. (For the
V
REF
1.23
V
lo
w
e
st t
e
m
p
e
r
a
tur
e
c
o
e
ff
i
c
i
e
nt
a
nd th
e
b
e
st st
a
bilit
y
w
ith ti
m
e
, us
e
1%
m
e
t
a
l
f
il
m
r
e
sistors.)
R2=1k (16.26-1)=15.26k, closest 1% value is 15.4k
R
2
=
15.4
k
.
9
BEIJING ESTEK ELECTRONICS CO.,LTD
LM2596
PROCEDURE
(A
d
j
u
sta
b
l
e
O
u
t
pu
t
V
o
lta
g
e
V
ersio
n
)
E
X
A
M
PLE
(A
d
j
u
sta
b
l
e
O
u
t
pu
t
V
o
lta
g
e
V
ersio
n
)
R
2
R
1
(V
OUT
1) V
REF
2. Inductor Selection (L1) 2. Inductor Selection (L1)
A
.
Ca
l
c
ul
a
t
e
th
e
indu
c
tor Volt
•
m
i
c
ro
sec
ond
c
on
s
t
a
nt E
T
(V
µs)
,
f
rom
A
.
Ca
l
c
ul
a
t
e
th
e
indu
c
tor Volt
m
i
c
ro
sec
ond
c
on
s
t
a
nt
th
e
f
ollo
w
in
g
f
or
m
ul
a
:
(E
T
)
,
E
T
(V
V
V
)
V
V
D
1000
s)
1000
IN
OUT
SAT
E
T
2
8
(
20
.
1
)
1
20
0
5
.
(
V
s)
V
IN
V
SAT
V
D
kH
z
150
28
1
1
6
.
0
5
.
150
where VSAT = internal switch saturation voltage = 1.16V
and VD= diode forward voltage drop = 0.5V
B. Use the E
T value from the previous formula and match it w
ith the
E
T number on the vertical axis of the Inductor Value Selection G
uide
s
ho
w
n in Fi
g
ur
e
7.
E
T
( .
684
)
.
205
.
3
C
.
on th
e
hori
z
ont
a
l
ax
i
s
,
se
l
ec
t th
e
m
ax
i
m
u
m
lo
a
d
c
u
rre
nt.
C
.
D. Identify the inductance region intersected by the E
T value and the
Maximum Load Current value. Each region is identified by an
inductance value and an inductor code (LXX).
E. Select an appropriate inductor from the four manufacturer’s part
nu
m
b
e
r
s
li
s
t
e
d in Fi
g
ur
e
8.
D
.
From the inductor value selection guide shown in Figure
7, the
inductance region intersected by the 34 (V
µs) horizontal line a
nd
the 3A vertical line is 47 µH, and the inductor code is L39.
E. From the table in Figure 8, locate line L39, and select an
indu
c
tor p
a
rt nu
m
b
e
r
f
ro
m
th
e
li
s
t o
f
m
a
nu
f
ac
tur
e
r
s
p
a
rt nu
m
b
e
r
s
.
3. Output Capacitor Selection (COUT) 3. Output Capacitor SeIection (COUT)
A. In themajorityofapplications,lowESRelectrolyticorsolidtantalum
capacitors between 82 µF and 820 µF provide the best results. This capacitor
should be located close to the IC using short capacitor leads and short copper
t
races
.
D
o
no
t
u
se
ca
p
ac
it
o
rs
l
arger
t
h
a
n
820
µ
F
.
B
.
To simplifythe capacitor selection procedure, refer to the quick
design table shown in Figure 3. This table contains different output
voltages, and lists various output capacitors that will provide the best
d
es
i
g
n
s
olution
s
.
B
.
Fromthequickdesign tableshown inFigure3, locatetheoutputvoltage
column.Fromthat column,locatetheoutputvoltageclosesttotheoutput
voltageinyourapplication.In thisexample,selectthe24Vline. Underthe
output capacitor section, select acapacitorfromthelistofthroughhole
electrolyticorsurfacemounttantalumtypes fromfourdifferentcapacitor
manufacturers.Itisrecommendedthatboththemanufacturersandthe
manufacturersseriesthat arelistedinthetablebeused.
Inthisexample,throughholealuminumelectrolyticcapacitorsfrom
several differentmanufacturersareavailable.
220µF/35V PanasonicHFQSeries
150µF/35V NichiconPLSeries
C
.
The capacitor voltage rating should be at least 1.5 times greater tha
n
the output voltage, and often much higher voltage ratings are neede
d to
sa
ti
s
f
y
th
e
lo
w
ES
R
r
e
quir
e
m
e
nt
s
n
ee
d
e
d
f
or lo
w
output rippl
e
v
olt
a
g
e
.
C
.
For a 20V output, a capacitor rating of at least 30V or more is
needed. In this example, either a 35V or 50V capacitor would
work. A 35V rating was chosen, although a 50V rating could also
be used if a lower output ripple voltage is needed.
Other manufacturers or other types of capacitors may also be used,
provided the capacitor specifications (especially the 100 kHz
ESR) closely match the types listed in the table. Refer to the
ca
p
ac
ito
r
m
a
nu
f
ac
tur
ers
d
a
t
a
s
h
ee
t
f
o
r
thi
s
in
f
o
r
m
a
tion
.
4. F
ee
d
for
w
ar
d
Ca
pa
c
i
tor
(C
FF
)
(See
Fi
g
u
re
1)
4. F
ee
d
for
w
ar
d
Ca
pa
c
i
tor
(C
FF
)
For output voltages greater than approximately 10V, an additional
capacitor is required. The compensation capacitor is typically between
100 pF and 33 nF, and is wired in parallel with the output voltage
setting resistor, R2. It provides additional stability for high output
voltages, low input-output voltages, and/or very low ESR output
ca
p
ac
ito
rs
,
s
u
c
h
as
s
olid t
a
nt
a
lu
m
ca
p
ac
ito
rs.
The table shown in Figure 3 contains feed forward capac
itor
values for various output voltages. In this example, a
560 pF
ca
p
ac
ito
r
i
s
n
ee
d
e
d
.
C
FF
1
31
1
0
3
R
2
This capacitor type can be ceramic, plastic, silver mica, etc. (Because of
the unstable characteristics of ceramic capacitors made with Z5U
m
a
t
er
i
a
l, th
e
y
are
not
rec
o
mm
e
nd
e
d.
)
1
0
BEIJING ESTEK ELECTRONICS CO.,LTD
LM2596
L
M2596
SE
R
IES
BUCK R
E
G
U
L
A
T
OR D
ESI
N
G
PROC
E
DUR
E
(ADJU
ST
AB
LE
OU
T
PU
T
)
T
h
r
ou
g
h
Ho
l
e
Ou
t
pu
t
C
apa
c
it
o
r
S
u
r
f
a
ce
M
oun
t
Ou
t
pu
t
C
apa
c
it
or
Ou
t
put
Voltage (V) Panasonic HF
Q
Series
(
F/
V
)
N
i
c
h
i
co
n
P
L
S
er
i
es
(
F/V) Feedforw
ard
ca
pa
c
i
tor
A
VX
T
PS S
er
i
es
(
F/
V
)
Sprague 595
D
Series
(
F/
V
)
F
ee
d
for
w
ard
Capacitor
2
820/3
5
820/3
5
33
n
F
330/6.
3
470/
4
33
n
F
4 560/35 470/35 10 nF 330/6.3 390/6.3 10 nF
6 470/25 470/25 3.3 nF 220/10 330/10 3.3 nF
9 330/25 330/25 1.5 nF 100/16 180/16 1.5 nF
12 330/25 330/25 1 nF 100/16 180/16 1 nF
15 220/35 220/35 680 pF 68/20 120/20 680 pF
24 220/35 150/35 560 pF 33/25 33/25 220 pF
28 100/50 100/50 390 pF 10/35 15/50 220 pF
Fi
g
ur
e
3.
O
utput
Ca
p
ac
itor
a
nd F
ee
d
f
or
w
a
rd
Ca
p
ac
itor S
e
l
ec
tion
T
a
ble
LM2596 SERIES BUCK REGULATOR DESIGN PROCEDURE
Induc
to
r
V
a
lue
Selec
t
i
o
n
Guide
s
(
F
or
C
o
n
ti
nu
o
us
Mode Opera
ti
o
n)
40V
L29
20V
L
3
0
L
3
1
L40
4
0V
30V
2
5V
L
2
7
L
3
6
L
3
7
L
4
3
10V
8V
L
2
1
L
2
2
L
3
2
L
3
3
20V
L28
1
9V
L
3
8
L
30
L39
7
V
6V
L
2
3
L
2
4
L
3
4
1
8V
17V
16V
1
5V
L
2
9
L21
L
2
2
L
3
1
L
3
2
L
4
0
L
3
3
5
V
L
1
5
L
1
6
L
2
5
1
4V
L
2
3
L
2
4
L
3
4
0.6 0.8 1.0 1.5 2.0 2.5
3.0
0
.6
0.8
1.0
1.5
2.0
2
.5
3.0
M
A
X
I
M
U
M
L
O
A
D
C
U
R
R
E
N
T
(
A
)
Fi
g
ur
e
4.
L
M2596
-
3.3
Fi
g
ur
e
6.
L
M2596
-
12
1
1
BEIJING ESTEK ELECTRONICS CO.,LTD
LM2596
40
V
20V
L
2
9
L
3
0
L
3
8
L
3
9
70
6
0
L27
L
3
5
Fi
g
ur
e
7.
L
M2596
-
A
D
J
L
4
3
15
V
12V
10
V
L
2
1
L
3
1
L
4
0
L
3
2
50
40
30
25
L
3
6
L28L29
L
3
0
L
3
7
L
3
8
L
3
9
L
4
4
9
V
8V
7
V
L
2
2
L
2
3
L
2
4
L
2
5
L
3
3
L
3
4
20
15
10
9
8
7
6
5
4
L
2
1
L22
L23
L
1
5
L
2
4
L
3
1
L32
L
2
5
L
4
0
L33
L
3
4
0.6 0.8 1.0 1.5 2.0 2.5
3.0
MAXIMUM LOAD CURRENT (A)
0.6 0.8 1.0 1.5 2.0 2.5
3.0
M
A
X
I
M
U
M
L
O
A
D
C
U
R
R
E
N
T
(
A
)
L
M2596
SE
R
IES
BUCK R
E
G
U
L
A
T
OR D
ESI
G
N PROC
E
DURE
(
C
o
n
ti
nu
ed)
I
ndu
c
t
an
c
e
C
u
r
-
S
c
ho
tt
Re
n
c
o
P
u
l
s
e
E
n
gi
n
eer
i
n
g
C
o
il
cr
a
f
t
(
H)
re
n
t
(A)
T
h
r
ou
g
h
Hole
S
u
rface
Mount
T
h
ro
u
g
h
Ho
le
S
u
rface
Mount
T
h
r
ou
g
h
Hole
S
u
rface
Mount
S
u
rface
M
oun
t
L
15
2
2
0.9
9
6714835
0
6714846
0
R
L
-
1284
-
22
-
43
R
L
1500
-
22
PE
-
53815
P
E
-
53815
-
S
DO3308-223
L21 68 0.99 67144070 67144450 RL-5471-5 RL1500-68 PE-53821 PE-53821-S
DO3316-683
L22 47 1.17 67144080 67144460 RL-5471-6 - PE-53822 PE-53822-S
DO3316-473
L23 33 1.40 67144090 67144470 RL-5471-7 - PE-53823 PE-53823-S
DO3316-333
L24 22 1.70 67148370 67148480 RL-1283-22-43 - PE-53824 PE-53825-S
DO3316-223
L25 15 2.10 67148380 67148490 RL-1283-15-43 - PE-53825 PE-53824-S
DO3316-153
L26 330 0.80 67144100 67144480 RL-5471-1 - PE-53826 PE-53826-S
DO5022P-334
L27 220 1.00 67144110 67144490 RL-5471-2 - PE-53827 PE-53827-S
DO5022P-224
L28 150 1.20 67144120 67144500 RL-5471-3 - PE-53828 PE-53828-S
DO5022P-154
L29 100 1.47 67144130 67144510 RL-5471-4 - PE-53829 PE-53829-S
DO5022P-104
L30 68 1.78 67144140 67144520 RL-5471-5 - PE-53830 PE-53830-S
DO5022P-683
L31 47 2.20 67144150 67144530 RL-5471-6 - PE-53831 PE-53831-S
DO5022P-473
L32 33 2.50 67144160 67144540 RL-5471-7 - PE-53932 PE-53932-S
DO5022P-333
L33 22 3.10 67148390 67148500 RL-1283-22-43 - PE-53933 PE-53933-S
DO5022P-223
L
34
1
5
3.4
0
6714840
0
6714879
0
R
L
-
1283
-
15
-
43
-
PE
-
53934
P
E
-
53934
-
S
2200
2000
1800
1600
1400
1200
1000
800
600
400
200
0
10 20 30 40 50 60 70
Figure 9. RMS Current Ratings for Low
ESR
El
ec
trol
y
ti
c
C
a
p
ac
itors (t
y
pi
ca
l)
C
A
P
A
CI
T
O
R
V
OL
T
A
GE
R
A
T
IN
G
(
V
)
1
2
BEIJING ESTEK ELECTRONICS CO.,LTD
LM2596
Address :
6A06--6A07
Rm 6A07,Changyin Office Building ,No.88,Yong Ding Road,Hai Dian District ,Beijing
Postalcode:100039
Tel: 86-010-58895780 / 81 / 82 / 83 / 84 Fax : 010-58895793
Http://www.estek.com.cn
Email:sales@estek.com.cn
REV No:01
-
060814
1
3
BEIJING ESTEK ELECTRONICS CO.,LTD