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MAX798ESE

High-Accuracy Step-Down Controller with Synchronous Rectifier for CPU Power

Maxim Integrated 

High-Accuracy Step-Down Controller

with Synchronous Rectifier for CPU Power

The MAX798 contains the following seven major circuit

blocks, which are shown in Figure 2.

PWM Controller Blocks:

• Multi-Input PWM Comparator

• Current-Sense Circuit

• PWM Logic Block

• Gate-Driver Outputs

Bias Generator Blocks:

• +5V Linear Regulator

• Automatic Bootstrap Switchover Circuit

• +2.505V Reference

BATTERY VOLTAGE

V+

TO

CSL

4.5V

SKIP

PWM

LOGIC

+5V LINEAR

REGULATOR

OUT

VL

SHDN

BST

DH

LX

+2.505V

REF

+2.505V

AT 100µA REF

PWM

COMPARATOR

1X

1.6V

GND

DL

PGND

CSH

CSL

ON/OFF

SHDN

SS

MAX798

FB

SYNC

+5V AT 5mA

MAIN

OUTPUT

Figure 2. Functional Diagram

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