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SC2542EVB

High Performance Wide Input Range Dual Synchronous Buck Controller

Semtech Corporation 

SC2542

POWER MANAGEMENT

Pin Descriptions

Pin # Pin Name

Pin Function

1

VIN

Input supply voltage. The range is from 6.5V to 28V.

2

VCC

10V regulator output. Supply voltage for chip bias and gate drivers.

3

ENABLE TTL compatible level. Then ENABLE is low, all outputs are disabled. Typical shitdown current

is 100nA.

4

STBY

When pulled low the 10V regulator and both switcher outputs are disabled. Only 5VSBY is

available. Quiescent current is typically 200µA.

5

FB1

Negative input of the error amplifier for output 1.

6

ERROUT1 Error amplifier output for buck converter 1.

7

MINSET1 Connect external resistor from this pin to AGND to set the minimum pulse width in

discontinuous mode. This also sets the operating frequency in skip mode for a given load.

8

SS1

An external capacitor connected from this pin to AGND sets the soft-start time. Disable

output1 by pulling this pin below 0.65V.

9

ILIM1

An external resistor connected from this pin to PHASE1 sets the overcurrent shutdown trip

point.

10

BST1

Boost capacitor connection for OUTPUT1 high side gate drive. Connect an external capacitor

as shown in the Typical Application Circuit.

11

DRVH1 Gate drive for the high side MOSFET of OUTPUT1. 180 degree out of phase with DRVH2.

12

PHASE1 Phase node for output 1.

13

DRVL1 Low side gate drive for output 1.

14

PGND Power ground of low-side drivers.

15

PVCC Supply voltage for low-side gate drivers.

16

DRVL2 Low-side gate drive for output 2.

17

PHASE2 Phase node for output 2.

18

DRVH2 Gate drive for the high side MOSFET of OUTPUT2. 180 degree out pf phase with GDRVH1.

19

BST2

Boost capacitor connection for the OUTPUT2 high side gate drive. Connect an external

capacitors as shown in the Typical Application Circuit.

20

ILIM2

An external resistor connected from this pin to PHASE2 sets the overcurrent shutdown trip

point.

21

SS2

An external capacitor connected from this pin to AGND sets the soft-start time. Disable output

2 by pulling this pin below 0.65V.

22

MINSET2 Connect one external resistor from this pin to AGND to set the minimum pulse width in

discontinuous mode. This also sets the operating frequency in skip mode for a given load.

23

ERROUT2 Error amplifier output for buck converter 2.

24

FB2

Negative input of the error amplifier for output 2.

 2005 Semtech Corp.

6

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