MAX1637 View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX1637

Miniature, Low-Voltage, Precision Step-Down Controller

Maxim Integrated 

Miniature, Low-Voltage,

Precision Step-Down Controller

SLOPE

COMPENSATION

30mV

SKIP

1X

gm

R

Q

S

OSC

CSH

CSL

FB

2X

REF

REF

CC

BST

LEVEL

DH

SHIFT

LX

SHDN

-100mV

DAC

CURRENT

LIMIT

CK

COUNTER

SOFT-START

SYNCHRONOUS

RECTIFIER CONTROL

RQ

S

SHOOT-

THROUGH

CONTROL

LEVEL

SHIFT

VGG

DL

PGND

Figure 3. PWM Controller Functional Diagram

PWM Controller Block

The heart of the current-mode PWM controller is a

multi-input, open-loop comparator that sums four sig-

nals: the output voltage error signal with respect to

the reference voltage, the current-sense signal, the

integrated voltage-feedback signal, and the slope-

compensation ramp (Figure 3). The PWM controller is

a direct-summing type, lacking a traditional error

amplifier and the phase shift associated with it. This

direct-summing configuration approaches ideal

cycle-by-cycle control over the output voltage.

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