SC2453ITSTR View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'SC2453ITSTR' PDF : 22 Pages View PDF
SC2453
POWER MANAGEMENT
Pin Descriptions (Cont.)
Pin #
16
17
18
19
20
21
22
23
24
25
26
27
28
Pin Name
AVCC
BST2
GD2H
PH2
GD2L
PGND
PVCC
GD1L
PH1
GD1H
BST1
VIN
BDI
Pin Function
This pin is connected to the output of the external linear regulator to supply the IC. The IC may
be powered directly from a single 5V (±10%) supply at this pin. The pin must be always
decoupled to PGND with a minimum of 1uF ceramic capacitor, place very close to the pin.
The pin powers the upper MOSFET driver of PWM switcher2. Connect this pin to the junction
of the bootstrap capacitor and cathode of the bootstrap diode. The anode of the bootstrap
diode is connected to the PVCC.
Switcher2 upper MOSFET gate driver output. It swings between BST2 and PH2.
The pin is connected to the junction of the upper MOSFET's source, output inductor and lower
MOSFET's drain.
Switcher2 lower MOSFET gate driver output. It swings between PVCC and PGND.
The pin provides the power ground for the lower gate drivers for both PWM switchers. It should
be connected to the sources of the lower MOSFETs and the negative terminal of the input
capacitors.
This pin is connected to the output of the external linear regulator to supply the internal lower
gate drivers for both PWM switchers. It may be powered directly from a single 5V (±10%)
supply at this pin. The pin must be always decoupled to PGND with a minimum of 10uF
ceramic capacitor, place very close to the pin.
Switcher1 lower MOSFET gate driver output. It swings between PVCC and PGND.
The pin is connected to the junction of the upper MOSFETs source, output inductor and lower
MOSFETs drain.
Switcher1 upper MOSFET gate driver output. It swings between BST1 and PH1.
The pin powers the upper MOSFET driver of PWM switcher1. Connect this pin to the junction
of the bootstrap capacitor and cathode of the bootstrap diode. The anode of the bootstrap
diode is connected to the PVCC.
The pin is internally connected to the pull-up resistor of an N-channel MOSFET to regulate the
bias for the IC.
The external bias pass PNP transistor driver. Internally connected to the drain of an N-channel
MOSFET.
2005 Semtech Corp.
7
www.semtech.com
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