SC1402(2001) データシートの表示（PDF） - Semtech Corporation

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SC1402
(Rev.:2001)

Multi-Output, Low-Noise Power Supply Controller for Notebook Computers

Semtech Corporation 

SC1402

POWER MANAGEMENT

Pin Descriptions (Cont.)

Pin#

Pin Name Pin Function

9

REF

2.5V Reference voltage output. Bypass to GND with 1µF minimum capacitor.

10

PSAVE

Logic control input that disables PSAVE mode when high. Connect to GND for power

save mode.

11

RESET

Active low timed output. RESET swings from GND to VL. Goes high after 32,000

clock cycle delay following power up as a power good signal.

Feedback input for 5V SMPS. Connect FB5 to a resistor divider for adjustable output

12

FB5

mode and FB5 regulates to REF (approx. 2.5V). FB5 selects the 5V fixed output

voltage setting when tied to GND.

13

CSL5

Current sense input for 5V SMPS.

14

CSH5

Current sense input for 5V SMPS.

15

SEQ

Inputs that selects SMPS power up sequence.

16

DH5

Gate drive output for the 5V, high side N-Channel MOSFET.

17

PHASE5 Switching node inductor connection.

18

BST5

Boost capacitor connection for 5V, SMPS high-side gate drive. Connect a 0.1µF

capacitor.

19

DL5

Gate drive output for the 5V, SMPS low-side N-Channel MOSFET.

20

PGND

Power ground.

21

VL

5V, Internal linear regulator output.

22

V+

Battery voltage input.

23

SHDN

Shutdown control input, active low.

24

DL3

Gate drive output for the 3.3V, SMPS low-side N-Channel MOSFET.

25

BST3

Boost capacitor connection for high side gate drive. Connect a 0.1µF capacitor.

26

PHASE3 Switching node inductor connection.

27

DH3

Gate drive output for the 3.3V, high-side N-Channel MOSFET.

28

RUN/ON3 ON/OFF control input of 3.3V SMPS.

Note:

1. All logic level inputs and outputs are open collector TTL compatible.

 2001 Semtech Corp.

7

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