MAX26239/MAX26240

4.5V to 36V, 6A Buck-Boost Converters

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Analog Devices | 2

Simplified Block Diagram

1.8V VCC

REGULATOR

CONTROL

LOGIC

SUP

BST1

LX1

PGND1

PWM

COMP

SUP

EN

PGOOD

LOGIC

FEEDB ACK-

SELE CT

LOGIC

SUPPLY

SWITCHOVER

FB

OUT

AGND

SOFT-START

EAMP

COMP

PLL/

OSCILLATOR

SPREAD

SPECTRUM

ON/OFF

FSYNC-

SELE CT

LOGIC

FPWM/SKIP MODE

EXTERNAL

CLOCK

CLK

SLOPE COMP

ILIM

COMP

SYNC*

SPS

PGOOD

MAX26239

MAX26240

VCC

BST2

LX2

PGND2

OUT

HS1

DRIVER

LS1

DRIVER

HS2

DRIVER

LS2

DRIVER

OTP

n

PRE-

REGULATOR

BANDGAP

AND

REFERENCES

VBG

IN

EN

COMP

POK

SHDN

POK

THSD

BK_CS

POK

ICSLIM

ICSLIM

ICS

SHDN

DH1

DH2

DL2

DL1

THSD

VTH_REF

OVP

COMP

VFB

UVLO VIN

UVLO VCC

VIN_UVLO

VTH_REF

VOVP_TH

ICS

VIN_UVLO

VVCC_UVLO

VCC_UVLO

VCC

VCC

VCC

OUT

VCCS

BST_CS

IZX

IZX

COMP

IZX

BST1_REFRESH

BST2_REFRESH

BST1_REFRESH

SYNCOUT

BST2_REFRESH

* SYNC CAN BE PROGRAMMED TO SYNCOUT. CONTACT ANALOG DEVICES FOR OPTIONS.

HS1

LS1

HS2

LS2