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date 01/26/2016
page 1 of 8
SERIES: V78-500-SMT │ DESCRIPTION: NON-ISOLATED SWITCHING REGULATOR
MODEL input
voltage
output
voltage
output
current
output
power
ripple and
noise1
efciency
typ
(Vdc)
range
(Vdc) (Vdc) (mA)
max
(W)
max
(mVp-p)
Vin min
(%)
Vin max
(%)
V7803-500-SMT 12 4.5 ~ 28 3.3 500 1.65 25 90 75
V7805-500-SMT 12 6 ~ 28 5 500 2.5 25 94 81
V7812-500-SMT224 14 ~ 28 12 500 6 25 95 90
V7815-500-SMT224 17 ~ 28 15 500 7.5 25 96 92
Notes: 1. ripple & noise are measured at 20 MHz BW with 1 µF ceramic cap and 10 µF electrolytic capacitors on the output
2. must operate with a minimum of 5% loading
page 1 of 8
FEATURES
• 500 mA current output
• high efficiency up to 96%
• no heat sink required
• SMT package
• remote on/off control
• low ripple and noise
• short circuit protection, thermal shutdown
• wide temperature (-40°C~+85°C)
RoHS
PART NUMBER KEY
V78 XX - XXX -SMT- X
Output VoltageBase Number Output Current Package Options
"blank" = standard
TR = Tape & Reel
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date 01/26/2016 │ page 2 of 8CUI Inc │ SERIES: V78-500-SMT │ DESCRIPTION: NON-ISOLATED SWITCHING REGULATOR
INPUT
parameter conditions/description min typ max units
input voltage
3.3 Vdc output
5 Vdc output
12 Vdc output
15Vdc output
4.5
6
14
17
12
12
24
24
28
28
28
28
Vdc
Vdc
Vdc
Vdc
remote on/off shutdown
threshold voltage 1.1 1.25 1.4 Vdc
on/off control current on:
off:
open or 1.5<Vc≤6V
GND or 0V<Vc<1V 2 µA
shutdown input current 15 30 µA
OUTPUT
parameter conditions/description min typ max units
max capacitive load 1000 µF
line regulation measured from low line to high line at 100% load ±0.2 ±0.5 %
load regulation measured from 10% to full load at nominal input ±0.3 ±0.75 %
voltage accuracy measured from low line to high line at 100% load ±2 ±3 %
adjustability1see application notes
temperature coefcient ±0.02 %/°C
Notes: 1. output voltage adjustment must meet Vin-Vo > 2V requirement
PROTECTIONS
parameter conditions/description min typ max units
short circuit protection hiccup, continuous, automatic recovery
thermal shutdown internal IC junction 160 °C
current limit 1.8 A
SAFETY AND COMPLIANCE
parameter conditions/description min typ max units
RoHS 2011/65/EU
MTBF as per MIL-HDBK-217F, 25°C 2,000,000 hours
ENVIRONMENTAL
parameter conditions/description min typ max units
case operating temperature 100 °C
operating temperature see derating curve -40 85 °C
storage temperature -55 125 °C
storage humidity 95 %
hand soldering for 10 seconds 300 °C
reow soldering refer to IPC/JEDEC J-STD-020D.1 240 °C
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date 01/26/2016 │ page 3 of 8CUI Inc │ SERIES: V78-500-SMT │ DESCRIPTION: NON-ISOLATED SWITCHING REGULATOR
MECHANICAL DRAWING
MECHANICAL
parameter conditions/description min typ max units
dimensions 15.24 x 8.30 x 7.25 (0.600 x 0.327 x 0.285 inch) mm
case material plastic (UL94-V0)
weight 2.3 g
units: mm [in]
pin tolerance: ±0.10 mm [±0.004 in]
general tolerance: ±0.25 mm [±0.010 in]
PIN CONNECTIONS
1 Vin
5 Vout
6 Vadj
7 GND
9 GND
10 On/Off
100
80
60
40
20
Ambient Temperature (°C)
Load (%)
-40-20 02040607185 100 120
DERATING CURVES
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date 01/26/2016 │ page 4 of 8CUI Inc │ SERIES: V78-500-SMT │ DESCRIPTION: NON-ISOLATED SWITCHING REGULATOR
PACKAGING DIMENSIONS
∅1.50 [0.059]
∅1.50 [0.059]
∅
13.00[0.512]
∅
21.50[0.846]
14.70 [0.579]
10.20[0.402]
5.60 [0.220]
6.50[0.256]
8.20[0.323]
10.20 [0.402]
2.00 [0.079]
1.75 [0.069]
11.50 [0.453]0.50 [0.020]
7.65 [0.301
]
16.00 [0.630]
12.40 [0.488]
15.65[0.616]
29.40 [1.157]
∅100.00[3.937]
∅330.00[12.992]
Note:
Unit :mm[inch]
Generaltolerances: 0.50mm[0.020inch]
Devicesper reel quantity:500pcs
No
te:
Un
it :mm[inch]
Ge
neraltolerances: 0.50mm[0.020inch]
L=530mm[20.866inch]Tube Quantity:33pcs
L=220mm[8.661inch] Tube Quantity:13pcs
Taping dimension:
Taping reel dimension:
TYPICAL APPLICATION CIRCUIT
V78XX-500-SMT
1. C1, C2: Use ceramic capacitors (see table below); C3: For best performance, use a 100 μF or more capacitor.
2. C1, C2, & C3 are required and should be placed close to the pins of the converter, with shortest possible leads.
3. R1 is used when trimming down. R2 is used when trimming up.
4. No parallel connection or plug and play.
Part Number C1
(ceramic capacitor)
C2
(ceramic capacitor)
V7803-500-SMT 10uF/50V 22uF/16V
V7805-500-SMT 10uF/50V 22uF/16V
V7812-500-SMT 10uF/50V 10uF/25V
V7815-500-SMT 10uF/50V 10uF/25V
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date 01/26/2016 │ page 5 of 8CUI Inc │ SERIES: V78-500-SMT │ DESCRIPTION: NON-ISOLATED SWITCHING REGULATOR
OUTPUT TRIMMING
V7815-500-SMT
V7812-500-SMT
V7805-500-SMT
V7803-500-SMT
Part Name Vo nom
3.3V
5.0V
12V
15V
Trim Down Trim Up
R2(K )ΩR1(KΩ)
75.10-10*Vo
Vo-3.3
61*Vo-75.10
3.3-Vo
269.37-15*Vo
Vo-15
66*Vo-269.37
15-Vo
=
91.52-10*Vo
Vo-5.0
=
287.02-20*Vo
Vo-12
=
=
=
61*Vo-91.52
5.0-Vo
=
71*Vo-287.02
12-Vo
=
=
To trim the output of the device input the desired output voltage (Vo) into the proper equation.
R1 trims the output voltage down and R2 trims the voltage up. If not using the trim feature
R1 and R2 are left open. Make sure that the desired output voltage is within the trim range
.
TEST CIRCUIT
1) Efficiency and OutputVoltage Ripple Test
Scope
Ceramic
7 9
5
Vin
GND
+Vout
C2
C1
25.4mm
1
2.54mm
DC/DC
Converter
470pF
6
C5
C3
25.4mm
12.7mm
1F 10 F
Copperstrip
Copperstrip
Ta ntalum
Ceramic
Load
2)
Start-up and Load TransientResponseTest
Scope
Ceramic
7 9
5
Vin
GND
+Vout
C2
C1
50.8 mm
1
2 .54 mm
DC/DC
Converter
470pF
6
C5
C3
Copper strip
Copper strip
Load
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date 01/26/2016 │ page 6 of 8CUI Inc │ SERIES: V78-500-SMT │ DESCRIPTION: NON-ISOLATED SWITCHING REGULATOR
CUI offers a two (2) year limited warranty. Complete warranty information is listed on our website.
CUI reserves the right to make changes to the product at any time without notice. Information provided by CUI is believed to be accurate and reliable. However, no responsibility is
assumed by CUI for its use, nor for any infringements of patents or other rights of third parties which may result from its use.
CUI products are not authorized or warranted for use as critical components in equipment that requires an extremely high level of reliability. A critical
component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to
affect its safety or effectiveness.
Headquarters
20050 SW 112th Ave.
Tualatin, OR 97062
800.275.4899
Fax 503.612.2383
cui.com
techsupport@cui.com
EFFICIENCY AND RIPPLE
0
10
20
30
40
50
60
70
80
90
100
20 50 80 120160 200240 280320 360400 440480 500550 Load (m A)
Efficiency(%)
V7803-500-SMT
V7805-500-SMT
V7812-500-SMT
V7815-500-SMT
V7803-500-SMT
V7805-500-SMT
V7812-500-SMT
V7815-500-SMT
V7803-500-SMT
V7805-500-SMT
V7812-500-SMT
V7815-500-SMT
V7803-500-SMT
V7805-500-SMT
V7812-500-SMT
V7815-500-SMT
0
5
10
15
20
25
30
35
40
45
20 50 80 120160 200240 280320 360400 440480 500550 Load(mA)
Ripple (m V)
Efficiency VS Output Load (Vin=Norm) Output VoltageRipple VS Output Load (Vin=Norm)
40
45
50
55
60
65
70
75
80
85
90
95
100
4.56 810121416172022242628Vi n(V)
Efficiency (%)
0
5
10
15
20
25
30
35
40
45
4.56 810121416172022242628
Vi n(V)
Ripple (mV)
Efficiency VS InputVoltage (FullLoad) Output VoltageRipple VS InputVoltage (FullLoad)
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date 01/26/2016 │ page 7 of 8CUI Inc │ SERIES: V78-500-SMT │ DESCRIPTION: NON-ISOLATED SWITCHING REGULATOR
TheON/OFF pinprovides several features foradjusting andsequencingthe powersupply, auserhas theflexibility of using theON/OFFpin as:
1) Adigital on/off controlbypulling down theON/OFFpin with an open-drain transistor.
ON/OFF
2) Line UVLO. If desiredtoachieveaUVLO voltage, aresistordivider from VintoON/OFFtoGND canbeusedtodisable theconverter until
ahigherinput voltageisachieved. Forexample,itisnot useful foraconverterwith12V output to startupwitha12Vinput ,as the
output cannot each regulation.Toenablethe converterwhenthe inputvoltage reaches14V,a51kΩ/5kΩvoltage dividerfromVin to GN
D
canbeconnected to theON/OFF pin. Both theprecision 1.25Vthreshold and150mV hysteresis ar emultipliedbythe resistor rati
o,
providingaproportional 12%hysteresisfor anystartup threshold. So,the turn offthreshold wouldbebetween 12.3V to 15.7V.
7,9
5
Vin
GND
+Vout
100F
1V78XX-500-SMT
C1
6
470pF
10
51KΩ
5KΩ
Load
3) Powersupply sequencing. By connecting asmall capacitor from ON/OFF to GND, the 2Acurrent source and1.25V thresholdcan provid
e
astableand predictabledelay betweenstartup of multiple powersupplies. Forexample,astartupdelay of roughly64mSisprovidedusi
ng
100nF, androughly 136mSbyusing 200nF.
7,9
5
Vin
GND
+Vout
100F
1
C1 6
470pF
10
100nF
C5
Load
CH1: Von/off
CH2: Vo
Delaytime: 64mS
7,9
5
Vin
GND
+Vout
100F
1
C1 6
470pF
10
200nF
C5
Load
CH1: Von/off
CH2: Vo
Delaytim e: 136mS
V78XX-500-SMT
V78XX-500-SMT
SHUTDOWN CONTROL
For more information, please visit the product page.
date 01/26/2016 │ page 8 of 8CUI Inc │ SERIES: V78-500-SMT │ DESCRIPTION: NON-ISOLATED SWITCHING REGULATOR
CUI offers a two (2) year limited warranty. Complete warranty information is listed on our website.
CUI reserves the right to make changes to the product at any time without notice. Information provided by CUI is believed to be accurate and reliable. However, no responsibility is
assumed by CUI for its use, nor for any infringements of patents or other rights of third parties which may result from its use.
CUI products are not authorized or warranted for use as critical components in equipment that requires an extremely high level of reliability. A critical
component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to
affect its safety or effectiveness.
Headquarters
20050 SW 112th Ave.
Tualatin, OR 97062
800.275.4899
Fax 503.612.2383
cui.com
techsupport@cui.com
rev. description date
1.0 initial release 01/04/2008
1.01 new template applied 04/28/2009
1.02 V-Innity branding removed 09/06/2012
1.03 added TR package option 10/31/2012
1.04 added minimum loading requirement note 01/30/2013
1.05 updated spec 03/08/2013
1.06 housing width changed, updated datasheet 01/26/2016
The revision history provided is for informational purposes only and is believed to be accurate.
REVISION HISTORY
For more information, please visit the product page.
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
CUI Inc.:
V7805-500-SMT-TR V7812-500-SMT-TR V7803-500-SMT-TR