MAX1875A Просмотр технического описания (PDF) - Maxim Integrated

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MAX1875A

Dual 180° Out-of-Phase Buck Controllers with Sequencing/Prebias Startup and POR

Maxim Integrated 

Dual 180° Out-of-Phase Buck Controllers with

Sequencing/Prebias Startup and POR

REF

GND

COMP1

FB1

VREF

2.0V

SOFT-START DAC

(SEQUENCING—

MAX1858A ONLY)

OSC

SYNC

CK0

RST

(MAX1858A/

MAX1876A ONLY)

1VP-P

OSCILLATOR

RESET

EN

VREF

VL

UVLO

AND

SHUTDOWN

COMP2

FB2

MAX1858A

MAX1875A

MAX1876A

5V LINEAR

REGULATOR

CONVERTER 1

RQ

SQ

V+

VL

BST1

DH1

LX1

DL1

PGND

CONVERTER 2

5µA

ILIM1

VL - 0.5V

BST2

DH2

LX2

DL2

ILIM2

Figure 2. Functional Diagram

The internal VL linear regulator can source over 50mA to

supply the IC, power the low-side gate driver, charge the

external boost capacitor, and supply small external

loads. When driving large FETs, little or no regulator cur-

rent may be available for external loads.

For example, when switched at 600kHz, a single large

FET with 18nC total gate charge requires 18nC ✕ 600kHz

= 11mA. To drive larger MOSFETs, or deliver larger

loads, connect VL to an external power supply from 4.5V

to 5.5V.

_______________________________________________________________________________________ 9

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