SC1403_04 Datasheet, PDF (8/31 Pages) Semtech Corporation – Mobile Multi-Output PWM Controller with Lossless Current Sense

SC1403
POWER MANAGEMENT
Pin Descriptions (Cont.)
PRELIMINARY
Pin # Pin Name Pin Function
19
DL5 Gate Drive Output for the 5V low side synchronous rectifier MOSFET.
20
PGND Power Ground.
21
VL
5V Internal Linear Regulator Output. For improved efficiency, VL connects to 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 3.3V low side synchronous rectifier MOSFET.
25
BST3 Boost Capacitor Connection for 3.3V high side gate drive.
26 PHASE3 3.3V Switching Node (inductor) Connection.
27
DH3 Gate Drive Output for the 3.3V, high side N-Channel switch.
28
ON3 3.3V ON/OFF Control Input.
Note: All logic level inputs and outputs are open collector TTL compatible.
Block Diagram
 2004 Semtech Corp.
8
United States Patent No. 6,377,032
www.semtech.com