MAX1637 Просмотр технического описания (PDF) - Maxim Integrated

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производитель

MAX1637

Miniature, Low-Voltage, Precision Step-Down Controller

Maxim Integrated 

Miniature, Low-Voltage,

Precision Step-Down Controller

3.15V TO 5.5V

VBIAS

VCC

SYNC

SKIP

VBATT

+

IC

POWER

MAX1637

VGG

BST

200kHz

TO

300kHz

DH

OSC

PWM

LX

LOGIC

VOUT

DL

+

REF

1.1V

REF.

PGND

SHDN

SHUTDOWN

CONTROL

OFF

REF

CSH

-

CSL

UNDER-

VOLTAGE

SLOPE

ERROR

FAULT

COMPENSATION INTEGRATOR

CC

OVERVOLTAGE

gm-

- FAULT

REF

VREF -30%

VREF +7%

60kHz

FB

LP FILTER

GND

Figure 2. Functional Diagram

The pulse-width-modulation (PWM) controller consists

of a multi-input PWM comparator, high-side and low-

side gate drivers, and logic. It uses a 200kHz/300kHz

synchronizable oscillator. The MAX1637 contains fault-

protection circuits that monitor the PWM output for

undervoltage and overvoltage. It includes a 1.100V pre-

cision reference. The circuit blocks are powered from

an internal IC power rail that receives power from VCC.

VGG provides direct power to the synchronous-switch

gate driver, but provides indirect power to the high-

side-switch gate driver via an external diode-capacitor

boost circuit.

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