Evaluates: MAX77801
MAX77801 Evaluation Kit
General Description
The MAX77801 evaluation kit demonstrates the IC 2A,
buck-boost with I2C capability. The EV kit enables user to
evaluate MAX77801 performances with preprogrammed
output voltage even without I2C interface board (e.g.,
MINIQUSB). The two output voltages supported by default
are 3.3V and 3.4V and it can be set by pulling DVS high/
low. With I2C interface board (additional order required
if necessary), user can set output voltage from 2.6V to
4.1875V with 12.5mV step. The EV kit comes standard
with the MAX77801EWP+ installed.
The MINIQUSB interface board can be used to enable
PC communication through the USB interface board.
Windows® 2000-, Windows XP®-, Windows Vista®-, and
Windows 7-compatible software along with an extender
board allows an IBM-compatible PC to use to the USB
port to emulate an I2C 2-wire inter-face. This menu-driven
program offers a graphical user interface (GUI) with con-
trol buttons.
Benets and Features
●Kelvin Sense Pins at the Input and Output of the
Regulator Ensure Accurate Efficiency Measurement
19-7523; Rev 0; 2/15
Ordering Information appears at end of data sheet.
Windows, Windows XP, and Windows Vista are registered trademarks
and service marks of Microsoft Corporation.
Quick Start
Required Equipment
●MAX77801 EV kit
●MINIQUSB command module (optional, USB cable
included)
●Adjustable DC power supply
●1.8V DC power supply (optional)
●Digital multimeters
Figure 1. MAX77801 Evaluation Board
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Evaluates: MAX77801
MAX77801 Evaluation Kit
Procedure
The EV kit is fully assembled and tested. Follow the steps
below to verify board operation. Use twisted wires of
appropriate gauge (20AWG) that are as short as possible
to connect the load and power sources.
1) Ensure that the EV kit has the correct jumper set-
tings, as shown in Table 1.
2) Connect the MINIQUSB interface board (if I2C con-
trol is required to test).
3) Preset the DC power supply to 3.8V. Turn off the
power supply. Do not turn on the power supply until
all connections are completed.
4) Connect the EV kit to the power supply and meters.
Adjust the ammeters to their largest current range
to minimize their series impedance. Do not allow
the ammeters to operate in their autorange mode.
If current readings are not desired, short across the
ammeters.
5) Turn on the power supply.
6) Switch JU2 to VIO (1-2) to enable the MAX77801.
7) Apply load for desired test. If reading register (e.g.,
reading status register) or writing register (e.g., pro-
gramming specic output voltage) is required, then
proceed to step 8.
8) Visit www.maximintegrated.com/evkitsoftware to
download the latest version of the EV kit software,
MAX77801Rxx.ZIP. Save the EV kit software to a
temporary folder and uncompress the ZIP le.
9) Install the EV kit software on your computer by run-
ning the INSTALL.EXE program inside the temporary
folder. The program les are copied and icons are
created in the Windows Start | Programs menu.
10) Connect the USB cable from the PC to the
MINIQUSB board.
11) Start the EV kit software by opening its icon in the
Start | Programs menu. The EV kit software main
window appears, as shown in Figure 2.
12) The EV kit is now ready for testing.
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Evaluates: MAX77801
MAX77801 Evaluation Kit
Detailed Description of Software
The GUI shown in Figure 2 is the main window of the
MAX77801 EV kit software that provides a convenient
means to control the MAX77801 IC. Use the mouse or
press the Tab key to navigate through the GUI controls.
The EV kit software main window consists of two tabs,
CHIPID/STATUS/CONFIG (Figure 2) and VOUT_DVS
(Figure 3). The CHIPID/STATUS/CONFIG tab sheet
provides group boxes, checkboxes, and pushbuttons
of the CHIP ID read, STATUS of alarm, CONFIG1, and
CONFIG2. VOUT_DVS tab sheet provides access to
control OUTPUT voltage depending on DVS pin status.
Refer to register description in the MAX77801 data sheet.
Figure 2. MAX77801 Evaluation Kit Software Window (CHIPID/STATUS/CONFIG Tab)
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Evaluates: MAX77801
MAX77801 Evaluation Kit
Figure 3. MAX77801 Evaluation Kit Software Window (VOUT_DVS Tab)
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Evaluates: MAX77801
MAX77801 Evaluation Kit
Detailed Description of Hardware
The MAX77801 EV kit demonstrates the MAX77801
buck-boost. It regulates output from input voltage ranges
from 2.3V to 5.5V. Programmable output range is from
2.6V to 4.1875V with 12.5mV step. The EV kit is suited
with a general DC input. By connecting an external
MINIQUSB, and launching the EV kit software, the user
can adjust output voltage can be reported the status of
buck-boost on the EV kit GUI. Table 1 lists jumpers and
associated functions that are available on the EV kit.
Table 1. Jumper Functions
*Default position.
JUMPER NODE OR FUNCTION SHUNT
POSITION FUNCTION
JU1 VIO 1-2* VIO is supplied from an onboard 1.8V LDO(U1)
2-3 VIO is supplied from MINIQUSB board
JU2 EN 1-2 Connecting EN to VIO (MAX77801 is enabled)
2-3* Connecting EN to GND (MAX77801 is disabled)
JU3 DVS 1-2 Connecting DVS to VIO, output voltage is set by VOUT_DVS_H register
2-3* Connecting DVS to GND, output voltage is set by VOUT_DVS_L register
JU4 Input for onboard LDO OPEN Disconnect onboard LDO input
1-2* Inboard LDO is supplied from VIN
JU5 SDA pullup OPEN* No pullup for SDA
1-2 SDA pin is pulled up to VIO through 2.2kΩ
JU6 SCL pullup OPEN* No pullup for SCL
1-2 SCL pin is pulled up to VIO through 2.2kΩ
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Evaluates: MAX77801
MAX77801 Evaluation Kit
Note: Indicate that you are using the MAX77801 when contacting these component suppliers.
PART QTY DESCRIPTION
C1 1
10μF ±5%, 6.3V X5R ceramic
capacitor (0603)
TDK CGB3C1X5R0J106M065AC
C2, C8,
C9 3
1μF ±10%, 6.3V X5R ceramic capacitors
(0402)
Murata GRM155R60J105KE19
C3 1
0.1μF ±10%, 10V X5R ceramic
capacitor (0402)
Taiyo-Yuden LMK105BJ104KV-F
C4 1
47μF ±20%, 6.3V X5R ceramic
capacitor (0805)
TDK C2012X5R0J476M125AC
C5, C7,
C10 0 Capacitors, not installed
C6 0 100µF capacitor, not installed
J1 1 20-pin, right-angle connector
Sullins PPTC102LJBN-RC
PART QTY DESCRIPTION
JU1,
JU2, JU3 33-pin straight connectors
Samtec TSW-103-07-L-S
JU4,
JU5, JU6 32-pin straight connectors
Samtec TSW-102-07-T-S
L1 1
1µH ±20% inductor,
ISAT = 8.7A, DCR = 13.25mΩ
Coilcraft XAL4020-102ME
R1 1 100kΩ ±1% resistor (0402)
R2, R3 2 2.2kΩ ±1% resistors (0402)
R4 1 0Ω resistor (0402)
U1 1 Buck-boost (20 WLP)
Maxim MAX77801EWP+
U2 1 Voltage regulator (5 SC70)
Maxim MAX8511EXK18+
— 1 PCB: MAX77801EVKIT
SUPPLIER PHONE WEBSITE
TDK 847-803-6100 www.comopnent.tdk.com
Murata 770-436-1300 www.murata-northamerica.com
Taiyo-Yuden 603-669-7587 www.t-yuden.com
Sullins 760-774-0125 www.sullinselectronics.com
Samtec 800-726-8329 www.samtec.com
Coilcraft 847-639-6400 www.coilcraft.com
Component List
Component Suppliers
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Evaluates: MAX77801
MAX77801 Evaluation Kit
Figure 4. MAX77801 EV Kit Schematic
IVS -20BG A P-A 376-00
E N
DVS
T P
T P
T P
POK
T P T P
SCL
TSW-102-07-T-S
TSW-102-07-T-S
SDA
TSW-102-07-T-S
04 02_ F F
2.2K
04 02_ F F
2.2K
VIO
T P
TSW-103-07-L-S
TSW-103-07-L-S
IND_DU A L
1U H
LXBB2LXBB1
PPTC102LJ BN-RC
VIO
47U F
6.3V
100K
TSW-103-07-L-S
T PT P
10V
0.1 U F
04 02_ F F
04 02_ F F
MAXIMPAD
100U F
6.3V
1210
MAXIMPAD
MAXIMPAD
04 02_ F F
6.3V6.3V
04 02_ F F
1U F
MAX8511EXK18+
1U F
N/A
OPEN OPEN OPEN
0603_ F F
0603_ F F
T P
T P
OU TBB
MAXIMPAD
MAXIMPAD
MAXIMPAD
VIN
0603_ F F
6.3V
10U F
T P
T P
6.3V
04 02_ F F
1U F
0
04 02_ F F
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Evaluates: MAX77801
MAX77801 Evaluation Kit
Figure 5. MAX77801 EV Kit Component Placement Guide–Top
Side
Figure 6. MAX8971 EV Kit PCB Layout–Top Side
Figure 7. MAX8971 EV Kit PCB Layout–Bottom Side
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Evaluates: MAX77801
MAX77801 Evaluation Kit
PART TYPE
MAX77801EVKIT# EV kit
MINIQUSB+ Command module
#Denotes RoHS compliant.
+Denotes a lead(Pb)-free/RoHS-compliant package.
Ordering Information
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specications without notice at any time.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. © 2015 Maxim Integrated Products, Inc.
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Evaluates: MAX77801
MAX77801 Evaluation Kit
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 2/15 Initial release —
Revision History
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
