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componentes Descripción

Fabricante

SC1404

Mobile Multi-Output PWM Controller with Virtual Current Sense™

Semtech Corporation 

SC1404

POWER MANAGEMENT

Pin Descriptions

PRELIMINARY

Pin # Pin Name Pin Function

1

CSH3

Current limit sense input for 3V SMPS. Connect to the inductor side of a current sense resistor.

2

CSL3

Output voltage sense input for 3V SMPS. Connect to the output side of a current sense resistor.

3

COMP3 Compensation pin and output of the 3.3V SMPS error amplifier.

4

12OUT 12V internal linear regulator output.

5

VDD

Supply voltage input for the 12OUT linear regulator. Also connects internally to a 19V overvoltage

shunt regulator clamp.

6

SYNC

Oscillator Synchronization and Frequency Select. Tie to VL for 300 kHz operation; tie to GND for 200

kHz. Drive externally to synchronize to an external oscillator between 240 kHz and 350 kHz.

7

ON5

5V ON/OFF Control Input. Connect a 1K-10K ohm resistor in series with ON5 to allow 5V shutdown

on OVP/UV.

8

GND

Low noise Analog Ground and Feedback reference point.

9

REF

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

10

PSAVE# Logic input that disables PSAVE Mode when high. Connect to GND for normal use.

11

RESET# Active-low timed Reset output. RESET# swings from GND to VL. RESET# goes high after a fixed

32,000 clock cycle delay following a successful power up.

12

COMP5 Compensation pin and output of the 5V SMPS error amplifier.

13

CSL5

Output voltage sense input for 5V SMPS. Connect to the output side of a current sense resistor.

14

CSH5

Current limit sense input for 5V SMPS. Connect to the inductor side of a current sense resistor.

15

SEQ

Input that selects SMPS power-up sequence and selects monitor voltage(s) used by RESET#.

16

DH5

Gate Drive Output for the 5V, high-side N-Channel switch.

17

PHASE5 5V switching node (inductor) connection.

18

BST5 Boost capacitor connection for 5V high-side gate drive.

19

DL5

Gate drive output for the 5V low-side synchronous rectifier MOSFET

20

PGND Power Ground.

21

VL

5 V internal linear regulator output. For improved efficiency, VL is switched to the 5V SMPS output

when 5V SMPS is enabled.

22

V+

Battery Voltage input.

23

SHDN# Shutdown control input, active low.

24

DL3

Gate drive output for the 3V low-side synchronous rectifier MOSFET.

25

BST3 Boost capacitor connection for 3V high-side gate drive.

26

PHASE3 3V switching node (inductor) connection.

27

DH3

Gate drive output for the 3V high-side N-Channel switch.

28

ON3

3V ON/OFF Control Input.

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

 2004 Semtech Corp.

6

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