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MAX15118

High-Efficiency, 18A, Current-Mode Synchronous

Step-Down Regulator with Integrated Switches

Functional Diagram

SKPM

SOURCE

SINK

ZX

IN

SS/REFIN

0.6V

SKPM

EN

AIN

SKIP

FB

GSNS

0.58V

COMP

LX

LX

PGOOD

CK

BST

LX

IN

GND

CK

IN

BIAS

GENERATOR

VOLTAGE

REFERENCE

EN LOGIC,

IN UVLO, THERMAL

SHDN

SKIP MODE

LOGIC

C

CURRENT-SENSE

AMPLIFIER

SS/REFIN BUFFER

PREBIAS

ABOVE

FORCED

PWM

START

10µA

ERROR

AMPLIFIER

555mV, RISING

530mV, FALLING

OSCILLATOR

RAMP

GENERATOR

LOW-SIDE SOURCE-SINK

CURRENT-LIMIT AND ZERO-

CROSSING COMPARATOR

PWM

COMPARATOR

CONTROL

LOGIC

HIGH-SIDE

CURRENT LIMIT

COMPENSATION

RAMP

MAX15118