SC2441A(2006) 查看數據表（PDF） - Semtech Corporation

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SC2441A
(Rev.:2006)

1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter

Semtech Corporation 

SC2441A

POWER MANAGEMENT

Pin Descriptions (Cont.)

20

GDL2

Gate Drive Output for Channel 2 Synchronous MOSFET. Gate drive voltage swings from

ground to VCC.

Supply Voltage for Both Step-down Controllers and the Synchronous MOSFET Gate Drivers. The

21

VCC

boost converter generates VCC if VIN is not high enough to fully enhance the power MOSFETs

and the boost converter provides an auxiliary supply voltage for the step-down controllers. Tie

VCC to VIN if the boost converter is not needed.

22

GDL1

Gate Drive Output for Channel 1 Synchronous MOSFET. Gate drive voltage swings from

ground to VCC.

23

GDH1

Gate Drive Output for Channel 1 Upper MOSFET. Gate drive voltage swings from ground to

VBST1.

24

PGND1 Power Ground Return of the Gate Drivers.

25

BST1

Bootstrapped Supply for Channel 1 Upper Gate Drive. Connect to a bootstrap capacitor and an

external diode.

26

PGND2 Boost Switch Emitter.

27

SW3

Boost Switch Collector. Connect to a boost inductor and freewheeling diode.

28

CKOUT Clock output. See timing diagram in Figure 5(b).

Exposed PAD Must be properly soldered to the signal ground plane to enhance thermal conduction.

 2006 Semtech Corp.

7

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