Analog Devices MAX77857 Manual Download Page 4

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Evaluates: MAX77857 (WLP)

MAX77857 Evaluation Kit

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MAX77857 EV KIT

PGND1

PGND2

OUT

PGND1S

INS

PGND2S

OUTS

DC POWER

SUPPLY

DIGITAL

VOLTMETER

ELECTRONIC

LOAD

DIGITAL

VOLTMETER

J1: INSTALLED 1-2
J2: INSTALLED

Figure 3. EV Kit Connection Block Diagram

—Standalone Operation

MAX77857 EV KIT

PGND1

PGND2

OUT

PGND1S

INS

PGND2S

OUTS

DC POWER

SUPPLY

DIGITAL

VOLTMETER

ELECTRONIC

LOAD

DIGITAL

VOLTMETER

J1: INSTALLED 2-3
J2: REMOVED

MAXUSB_INTERFACE#

CONNECTOR

Figure 4. EV Kit Connection Block Diagram

—with MAXUSB_INTERFACE#

MAX77857 EV KIT

PGND1

PGND2

OUT

PGND1S

INS

PGND2S

OUTS

DC POWER

SUPPLY

DIGITAL

VOLTMETER

ELECTRONIC

LOAD

DIGITAL

VOLTMETER

EXTERNAL

C HOST

SCL

SDA

POWER

SUPPLY

VIO

AGND1

J1: INSTALLED 2-3
J2: REMOVED

Figure 5. EV Kit Connection Block Diagram

—with External I2C Bus

Summary of Contents for MAX77857

Page 1: ...s compatible with any version of the MAX77857 WLP IC MAX77857BEWB T is the default installed on the EV kit Features Proven PCB Reference Design and Layout Benefit Fully Assembled and Tested Sense Poin...

Page 2: ...F 25V 0603 CBST2 0 22 F 25V 0603 CIN 2x 10 F 25V 0805 COUT 2x 22 F 25V 0805 VIO CVIO 0 47 F 6 3V 0402 IO SUPPLY 1 08V TO 2 0V CHOOSE RSEL VALUE BASED ON TABLE 2 USING INTERNAL FEEDBACK RESISTORS POKB...

Page 3: ...andalone Operation section for more information 2 3 Connects EN to VIO The converter is enabled when both VIN and VIO are valid Not installed Floats EN Use for controlling EN from an external logic si...

Page 4: ...PGND1 IN PGND2 OUT PGND1S INS PGND2S OUTS J1 J2 DC POWER SUPPLY DIGITAL VOLTMETER ELECTRONIC LOAD DIGITAL VOLTMETER A A PC J1 INSTALLED 2 3 J2 REMOVED MAXUSB_INTERFACE CONNECTOR Figure 4 EV Kit Conne...

Page 5: ...ructions to complete the installation 8 Turn off the input power supply connected in step 4 9 Remove jumper J2 VIO is later powered from MAXUSB_INTERFACE s on board LDO Move jumper J1 to position 2 3...

Page 6: ...external I2C serial bus s 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 RSEL Configurati...

Page 7: ...n When using internal feedback output voltage ranges are between 4 5V and 15V in 73 5mV steps When using external feedback output voltage range and step size vary based on the external feedback resist...

Page 8: ...ion and line regulation measurements use these sense pins to measure input and output voltages Warning These sense pins are only for measuring voltages Do not connect input supply to input sense pins...

Page 9: ...ng the GUI to MAXUSB_INTERFACE After opening the GUI click Device in the upper left corner of the GUI window Click Connect in the drop down menu If you have multiple MAXUSB_INTERFACE adapters or FTDI...

Page 10: ...X77857 s registers Alternatively click Read on each setting section to obtain the setting values of that particular section currently stored on the MAX77857 s registers After changing the setting valu...

Page 11: ...Internal Reference Voltage slider To obtain the correct value check the Internal Feedback or External Feedback checkbox corresponding to the EV kit configuration For external feedback configuration e...

Page 12: ...is critical to achieving low switching power losses and clean stable operation The EV kit also serves as a Maxim recommended layout of the MAX77857 If POK or fault interrupt functionality is desired t...

Page 13: ...otstrap capacitor CBST as short as possible Prioritize CBST placement to reduce trace length to the IC Connect the inner PGND bumps to the low impedance ground plane on the PCB with vias placed next t...

Page 14: ...IC TO MINIMIZE PARASITIC INDUCTANCE WITHIN THE LOOP IN PGND OUT PGND BST1 VL FB SEL USING INTERNAL FEEDBACK RESISTORS BST2 4 0mm x 4 0mm LX1 LX2 LAYOUT BASED ON 7 0A ILIM CONFIGURATION 0603 0402 0805...

Page 15: ...D HDI VIA 4mil HOLE 8mil PAD LEGEND COMPONENT SIZES LISTED IN IMPERIAL METRIC AGND VIO EN SDA SCL POKB INTB L 1008 2520 C IN 0603 C IN 0603 C OUT 0603 C OUT 0603 CBST2 0603 CBST1 0603 RSEL 0402 R PU 0...

Page 16: ...CY BUCK BOOST CONVERTER PACKAGE OUTLINE DRAWING 21 100367 PACKAGE CODE W352A2 1 WLP35 C9 DNP N A N A OPEN CAPACITOR SMT 0402 OPEN FORMFACTOR R11 DNP N A N A OPEN RESISTOR 0402 OPEN FORMFACTOR Componen...

Page 17: ...PGND2S 2 5001 KEYSTONE N A TEST POINT PIN DIA 0 1IN TOTAL LENGTH 0 3IN BOARD HOLE 0 04IN BLACK PHOSPHOR BRONZE WIRE SILVER PLATE FINISH R1 1 CRCW0402510KFK VISHAY DALE 510K RES SMT 0402 510K 1 100PPM...

Page 18: ...Evaluates MAX77857 WLP MAX77857 Evaluation Kit www analog com Analog Devices 18 MAX77857 EV Kit Schematic...

Page 19: ...tion Kit www analog com Analog Devices 19 MAX77857 EV Kit PCB Layouts MAX77857 EV Kit Component Placement Guide Top Silkscreen MAX77857 EV Kit PCB Layout Internal 2 MAX77857 EV Kit PCB Layout Top View...

Page 20: ...57 WLP MAX77857 Evaluation Kit www analog com Analog Devices 20 MAX77857 EV Kit PCB Layouts continued MAX77857 EV Kit PCB Layout Internal 4 MAX77857 EV Kit PCB Layout Internal 5 MAX77857 EV Kit PCB La...

Page 21: ...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 n...

Page 22: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Maxim Integrated MAX77857WEVKIT...

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