NCP3488 Ver la hoja de datos (PDF) - ON Semiconductor

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Fabricante

NCP3488

MOSFET Driver with Dual Outputs for Synchronous Buck Converters

ON Semiconductor 

OD 3

IN 2

VCC

TSD

UVLO

START STOP

MIN DRVL

OFF TIMER

NCP3488

FALLING

EDGE

DELAY

FALLING

EDGE

DELAY

NON−OVERLAP

TIMERS

MONITOR

MONITOR

Figure 1. Block Diagram

1 BST

8 DRVH

7 SWN

4 VCC

5 DRVL

6 PGND

PIN DESCRIPTION

Pin No. Symbol

Description

1

BST

Upper MOSFET Floating Bootstrap Supply. A capacitor connected between BST and SW pins holds this

bootstrap voltage for the high−side MOSFET as it is switched. The recommended capacitor value is between

100 nF and 1.0 mF. An external diode is required with the NCP3488.

2

IN

Logic−Level Input. This pin has primary control of the drive outputs.

3

OD

Output Disable. When low, normal operation is disabled forcing DRVH and DRVL low.

4

VCC

Input Supply. A 1.0 mF ceramic capacitor should be connected from this pin to PGND.

5

DRVL Output drive for the lower MOSFET.

6

PGND Power Ground. Should be closely connected to the source of the lower MOSFET.

7

SWN Switch Node. Connect to the source of the upper MOSFET.

8

DRVH Output drive for the upper MOSFET.

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2

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