SC1403(2002) View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
SC1403 Datasheet PDF : 30 Pages
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SC1403
POWER MANAGEMENT
Pin Descriptions
PRELIMINARY
Pin # Pin Name Pin Function
1
CSH3 Current limit sense input for 3.3 V SMPS. Connect to the inductor side of a current sense resistor .
2
CSL3 Output voltage sense input for 3.3 V SMPS. Connect to the output side of a current sense resistor .
3
FB3 Feedback Input for the 3.3 V SMPS; regulates at FB3 = REF (approx. 2.5 V) in adjustable mode.
FB3 selects the 3.3 V fixed output voltage setting when tied to GND. Connect FB3 to a resistor
divider for adjustable output mode.
4
COMP3 The output of the error amplifier for 3.3V SMPS.
5
COMP5 The output of the error amplifier for 5.0V SMPS.
6
SYNC Oscillator Synchronization and Frequency Select. Tie to VL for 300 kHz operation; tie to GND for
200 kHz. Driven externally to SYNC between 240 kHz and 350 kHz.
7
ON5 5V ON/OFF Control Input.
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 Control Input that disables PSAVE Mode when high. Connect to GND for normal use.
11 RESET# Active Low Timed Reset Output. RESET# swings GND to VL. Goes high after a fixed 32,000 clock
cycle delay following power up.
12
FB5 Feedback Input for 5 V SMPS; regulates at FB5 = REF (approx. 2.5 V) in adjustable mode. FB5
selects the 5 V fixed output voltage setting when tied to GND. Connect FB5 to a resistor divider for
adjustable output mode.
13
CSL5 Output voltage sense input for 5 V SMPS. Connect to the output side of a current sense resistor .
14
CSH5 Current limit sense input for 5 V SMPS. Connect to the inductor side of a current sense resistor .
15
SEQ Input that selects SMPS sequence for RESET#.
16
DH5 Gate Drive Output for the 5 V, high side N-Channel switch.
17 PHASE5 Switching Node (inductor) connection.
18
BST5 Boost capacitor connection for high side gate drive.
Note: All logic level inputs and outputs are open collector TTL compatible.
2002 Semtech Corp.
7
www.semtech.com
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