to ask an associate for production status of specific part numbers.
MAX77857 Evaluation Kit
Evaluates: MAX77857 (WLP)
319-100857; Rev 0; 3/22
General Description
The MAX77857 evaluation kit (EV kit) is a fully assembled
and tested printed circuit board (PCB) that demonstrates
the MAX77857, a high-efficiency, high-performance buck-
boost regulator with a switching current of 7A. The IC is
capable of 2.5V to 16V input and dynamically adjustable
output between 4.5V to 15V when using internal feedback
resistors, or between 3V to 15V when using external
feedback resistors. The EV kit is factory-configured as
internal feedback with default startup output voltage at 5V.
Other startup voltages can be achieved with external
feedback resistors. The output voltage can be adjusted
dynamically through the I
2
C serial interface.
I/O pins are available to support the I
2
C serial interface,
Enable function, and interrupt/Power-OK indicator. The
I
2
C slave address, switching current limit, and feedback
configuration can be adjusted by changing the R
SEL
resistor value (R9). MAXUSB_INTERFACE# allows the
use of Windows
®
-based software with a friendly graphical
user interface (GUI) as well as a detailed register-based
interface to exercise all features of the IC. The EV kit is
compatible with any version of the MAX77857 WLP IC
(MAX77T is the default installed on the EV kit).
Features
•
Proven PCB Reference Design and Layout Benefit
•
Fully Assembled and Tested
•
Sense Points for High-Accuracy Measurements
•
Accessible Test Point Pins for EN, POKB/INTB, V
IO
,
and I
2
C Serial Interface SCL, SDA
•
MAXUSB_INTERFACE# Allows Easy Communication
with a Windows PC
•
GUI Software that Drives I
2
C Serial Interface for
Optional Software Control
•
Startup Output Voltage Adjustable Through External
Feedback Resistors
•
Output Voltage Dynamically Adjustable Through I
2
C
Serial Interface
•
I
2
C Slave Address, Switching Current Limit, and
Feedback Configuration Adjustable Using R
SEL
(R9)
Check List
•
MAX77857 IC Evaluation Board
•
MAXUSB_INTERFACE# (USB to I
2
C Serial Interface)
•
USB Type-A to Micro-USB Cable
•
Windows-based Graphical User Interface (GUI) Software
• Can be downloaded from Maxim’s website at
https://www.maximintegrated.com/products/MAX77857WEVKIT
(under the
Design Resources
tab). Windows 7 or newer is required to use the EV kit GUI software.
EV Kit Specifications
SPECIFICATION
TEST CONDITION
MIN
TYP
MAX
UNIT
Input voltage
2.5
16
V
Output voltage
Internal feedback
4.5
15
V
External feedback
3
15
Default output voltage
Internal feedback
5
V
Switching current limit
7
A
Peak efficiency
V
IN
= 4V, V
OUT
= 5V, 700mA load
97.0
%
Windows is a registered trademark and registered service mark of Microsoft Corporation.
