Analog Devices MAX77857 Manual
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Analog Devices MAX77857 Manual

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MAX77857 Evaluation Kit
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
I/O pins are available to support the I
Enable function, and interrupt/Power-OK indicator. The
2
I
C slave address, switching current limit, and feedback
configuration can be adjusted by changing the R
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
(MAX77857BEWB+T is the default installed on the EV kit).
Check List
•
MAX77857 IC Evaluation Board
•
MAXUSB_INTERFACE# (USB to I
•
USB Type-A to Micro-USB Cable
•
Windows-based Graphical User Interface (GUI) Software
• Can be downloaded from Maxim's website at
(under the Design Resources tab). Windows 7 or newer is required to use the EV kit GUI software.
EV Kit Specifications
SPECIFICATION
Input voltage
Output voltage
Default output voltage
Switching current limit
Peak efficiency
Windows is a registered trademark and registered service mark of Microsoft Corporation.
319-100857; Rev 0; 3/22
2
C serial interface.
2
C serial interface,
2
C Serial Interface)
TEST CONDITION
Internal feedback
External feedback
Internal feedback
V
= 4V, V
= 5V, 700mA load
IN
OUT
Evaluates: MAX77857 (WLP)
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
2
and I
C Serial Interface SCL, SDA
•
MAXUSB_INTERFACE# Allows Easy Communication
with a Windows PC
•
GUI Software that Drives I
Optional Software Control
•
Startup Output Voltage Adjustable Through External
Feedback Resistors
•
Output Voltage Dynamically Adjustable Through I
Serial Interface
•
2
I
C Slave Address, Switching Current Limit, and
Feedback Configuration Adjustable Using R
SEL
Ordering Information
https://www.maximintegrated.com/products/MAX77857WEVKIT
2
C Serial Interface for
appears at end of data sheet.
MIN
TYP
MAX
2.5
16
4.5
15
3
15
5
7
97.0
,
IO
2
C
(R9)
SEL
UNIT
V
V
V
A
%

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Summary of Contents for Analog Devices MAX77857

  • Page 1 Evaluates: MAX77857 (WLP) Features General Description • Proven PCB Reference Design and Layout Benefit The MAX77857 evaluation kit (EV kit) is a fully assembled • Fully Assembled and Tested and tested printed circuit board (PCB) that demonstrates • Sense Points for High-Accuracy Measurements the MAX77857, a high-efficiency, high-performance buck- •...
  • Page 2 C INTERFACE AGND PGND *CHOOS E R VALUE SEL * BASED ON TABLE 2 Figure 1. MAX77857 Typical Application Circuit SWITCH NODES PROBE POINTS OUTPUT LOAD TERMINALS INPUT SUPPLY TERMINALS INPUT VOLTAGE SENSE PINS OUTPUT VOLTAGE SENSE PINS MAX77857 SOLUTION...

  • Page 3: Quick Start

    C serial interface (optional) • USB Type-A to Micro-USB cable (optional) • Windows-based PC with MAX77857 EV kit GUI (optional) Setup Overview Typical bench setups for the MAX77857 EV kit with different configurations are shown in Figure Figure 4, and Figure www.analog.com...
  • Page 4 Evaluates: MAX77857 (WLP) MAX77857 Evaluation Kit PGND1S PGND2S PGND1 PGND2 DIGITAL DC POWER ELECTRONIC DIGITAL VOLTMETER SUPPLY LOAD VOLTMETER MAX77857 EV KIT OUTS J1: INSTALLED 1-2 J2: INSTALLED Figure 3. EV Kit Connection Block Diagram—Standalone Operation PGND1S PGND2S PGND1 PGND2...

  • Page 5: Standalone Operation

    V pin. This is useful for systems without a host controller or if the MAX77857 is the only power supply in the system. To configure the MAX77857 EV kit for standalone operation, install header jumper www.analog.com...
  • Page 6 V pin by connecting header jumper J2. Make sure the external I logic voltage level is compatible with the MAX77857’s I/O logic voltage level. Refer to the MAX77857 IC data sheet for the appropriate I/O logic voltage level.
  • Page 7 *Default EV kit configuration High-Temperature Testing The MAX77857 is rated for operation under junction temperatures up to +125°C. Note that not all components on the EV kit are rated for temperatures this high. Some ceramic capacitors experience extra leakage when put under temperatures higher than they are rated for and supply current readings for the IC might be larger than expected.

  • Page 8: Input Voltage

    MAXUSB_INTERFACE# drives I C communication with the EV kit. Every control in the GUI corresponds directly to a register within the MAX77857. Refer to the Register Map section of the MAX77857 IC data sheet for a complete description of the registers. See Figure 7 for a screenshot of the GUI upon first opening.

  • Page 9: Installation

    MAXUSB_INTERFACE# adapters or FTDI devices connected to your PC, the Port Synchronization menu appears (Figure 8). Select the port corresponding to the MAXUSB_INTERFACE# attached to the MAX77857 EV kit and click Connect. The Device Synchronization menu opens...
  • Page 10 Miscellaneous Configuration. Click Read Once located on the top of the GUI window to obtain all setting values currently stored on all the MAX77857’s registers. After changing the setting values in the GUI software, click Write on the top of the GUI window to apply all settings to the MAX77857’s registers.
  • Page 11 (using the internal reference voltage DVS slew rate). Refer to the MAX77857 IC data sheet for more information on each available setting. Click Read to obtain the setting stored on the IC and click Write to apply new settings to the IC.
  • Page 12 Figure 13. Configuration Tab—Miscellaneous Configuration Sections Register Map The Register Map tab provides an overview of all the MAX77857 registers and the values currently stored on them. Clicking on an individual bit shows the name and description of the specific bitfield.
  • Page 13 Keep the power traces and load connections short and wide. This is essential for high converter efficiency. • Do not neglect ceramic capacitor DC voltage derating. Choose capacitor values and case sizes carefully. Refer to the Output Capacitor Selection section in the MAX77857 IC data sheet and Tutorial 5527 for more information.
  • Page 14 Evaluates: MAX77857 (WLP) MAX77857 Evaluation Kit LEGEND **LAYOUT BASED ON 7.0A I CONFIGURATION 4.0mm x 4.0mm 4.0mm x 4.0mm PGND PGND 0805 0603 BST1 BST2 BST1 BST2 0603 0603 0402 NON-HDI *USING INTERNAL 8mil HOLE, 16mil PAD FEEDB ACK RESISTORS...

  • Page 15: Ordering Information

    Evaluates: MAX77857 (WLP) MAX77857 Evaluation Kit **LAYOUT BASED ON LEGEND 3.8A I CONFIGURATION 1008 (2520) PGND PGND 1008 (2520) 0603 0402 NON-HDI VIA BST1 BST2 BST1 BST2 8mil HOLE, 16mil PAD 0603 0603 6mil HOLE, 12mil PAD HDI µVIA *USING INTERNAL...
  • Page 16 PACKAGE CODE: W352A2+1; WLP35 CAPACITOR; SMT (0402); OPEN; OPEN FORMFACTOR RESISTOR; 0402; OPEN; OPEN FORMFACTOR Components below this line are outside of the immediate MAX77857 evaluation circuit and solution silkscreen. AGND1, AGND2, EVK KIT PARTS; MAXIM PAD; WIRE; MAXIM IN, OUT, 9020 BUSS WEICO WIRE NATURAL;...
  • Page 17 Evaluates: MAX77857 (WLP) MAX77857 Evaluation Kit TEST POINT; PIN DIA=0.1IN; TOTAL LENGTH=0.3IN; BOARD INS, OUTS, 5000 KEYSTONE HOLE=0.04IN; RED; PHOSPHOR VIO, VL BRONZE WIRE SILVER PLATE FINISH; TSW- CONNECTOR; THROUGH HOLE; TSW-103-07-T-S SAMTEC 103-07- TSW SERIES; SINGLE ROW; STRAIGHT; 3PINS EVKIT PART-CONNECTOR;...
  • Page 18 Evaluates: MAX77857 (WLP) MAX77857 Evaluation Kit MAX77857 EV Kit Schematic www.analog.com Analog Devices | 18...
  • Page 19 Evaluates: MAX77857 (WLP) MAX77857 Evaluation Kit MAX77857 EV Kit PCB Layouts MAX77857 EV Kit Component Placement Guide—Top MAX77857 EV Kit PCB Layout—Internal 2 Silkscreen MAX77857 EV Kit PCB Layout—Top View MAX77857 EV Kit PCB Layout—Internal 3 www.analog.com Analog Devices | 19...
  • Page 20 Evaluates: MAX77857 (WLP) MAX77857 Evaluation Kit MAX77857 EV Kit PCB Layouts (continued) MAX77857 EV Kit PCB Layout—Internal 4 MAX77857 EV Kit PCB Layout—Internal 5 MAX77857 EV Kit PCB Layout—Bottom View www.analog.com Analog Devices | 20...

  • Page 21: Revision History

    Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

  • Page 22: Maxim Integrated

    Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Maxim Integrated MAX77857WEVKIT#...

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