SC1402ISS(2001) 데이터 시트보기 (PDF) - Semtech Corporation

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SC1402ISS
(Rev.:2001)

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

Semtech Corporation 

POWER MANAGEMENT

Pin Configuration

Top View

SC1402

Ordering Information

DEVICE

SC1402ISS

PACKAGE

SSOP-28

TEMP. (TA)

-40 - +85°C

Notes:

1. Only available in tape and reel packaging. A reel contains

1000 devices.

SSOP-28

Pin Descriptions

Pin#

1

Pin Name

CSH3

Pin Function

Current Sense Input for the 3.3V SMPS. Current limit level is 100mV referred to

CSL3.

2

CSL3

Current Sense Input for 3.3V SMPS.

3

FB3

Feedback Input for the 3.3V SMPS; Connect FB3 to a resistor divider for adjustable

output mode and FB3 is regulated to REF (approx. 2.5V). FB3 selects the 3.3V fixed

output voltage setting when tied to GND.

4

12OUT

12V, 120mA Linear Regulator Output. Input supply comes from VDD. Bypass 12 OUT

to GND with 1µF minimum capacitor.

5

VDD

Supply Voltage Input for the 12 OUT Linear Regulator. Also connects to a 18V

overvoltage shunt regulator clamp.

6

SYNC

Oscillator Synchronization and Frequency Select. Tie to VL for 300kHz operation; tie

to GND for 200kHz. Driven externally to SYNC between 240kHz and 350kHz.

7

TIME/ON5 Dual Purpose Timing Capacitor Pin and 5V SMPS ON/OFF Control Input. Input

resistor of 1K is required when using ON/OFF control input.

8

GND

Low noise Analog Ground and feedback reference point.

 2001 Semtech Corp.

6

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