SC411
POWER MANAGEMENT
Pin Descriptions (Cont.)
12
13
14
DH
BST
NC
Gate drive output for the high side MOSFET switch.
Boost capacitor connection for the high side gate drive.
Not connected.
Enable/Power Save input. Pull down to VSSA to shut down VOUT and discharge it through
22Ω (nom.). Pull up to enable VOUT and activate PSAVE mode. Float to enable VOUT ac-
tivate continuous conduction mode (CCM). If
fl
oated, bypass to VSSA with a 10nF ceramic
capacitor.
This pin is used to sense VBAT through a pullup resistor, RTON, and to set the top MOSFET
on-time. Bypass this pin with a 1nF ceramic capacitor to VSSA.
Pad for heatsinking purposes. Connect to ground plane using multiple vias.
Not connected internally.
15
EN/PSV
16
-
TON
Thermal
Pad
Shoot-Through Delay Timing Diagram
LX
DH
DL
DL
tplhDL
tplhDH
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2007 Semtech Corp.
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