SC1403(2002) View Datasheet(PDF) - Semtech Corporation
Part Name
Description
Manufacturer
SC1403 Datasheet PDF : 30 Pages
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POWER MANAGEMENT
Pin Descriptions (Cont.)
Pin # Pin Name Pin Function
19
DL5 Gate Drive Output for the low side synchronous rectifier MOSFET.
20
PGND Power Ground.
21
VL
5 V Internal Linear Regulator Output.
22
V+
Battery Voltage Input.
23 SHDN# Shutdown Control Input, active low.
24
DL3 Gate Drive Output for the low side synchronous rectifier MOSFET.
25
BST3 Boost Capacitor Connection for high side gate drive.
26 PHASE3 Switching Node (inductor) Connection.
27
DH3 Gate Drive Output for the 3.3 V, high side N-Channel switch.
28
ON3 ON/OFF Control Input.
Note: All logic level inputs and outputs are open collector TTL compatible.
Block Diagram
V+
V+
SYNC PSAVE
+3.3V
VL
VL
BST3
VIN
DH3
LX3
DL3
5V
REG
EN
DELAY
CSL5
VL
LS
OSC
50mV
7.5m V
2.5m V
OC
3V
CTL
PS LOGIC
POL
HS
LS
OC
5V
CTL
LOGIC PS
POL
VL
VIN
BST5
VL
50mV
DH5
LX5
DL5
PGND
7.5m V
2.5m V
CSH3
CSL3
COMP3
PWM
MODULATOR
OV FAULT
+10%
-25%
UV FAULT
PWM
MODULATOR
CSH5
CSL5
COMP5
2002 Semtech Corp.
FB3
0.6V
REF
TIME/ON5
V+
CSL3
2.5V CSL5
REF
CURRENT
RAMP
3
VL
2
POW ER-ON
SEQUENCE
LOGIC
0.6
DELAY
TIMER
BV
SS
2.0
0.5
FB5
RESET
SEQ
RUN/ON3
8
SC1403
PRELIMINARY
+5V
www.semtech.com
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