SC2442 Datasheet, PDF (5/10 Pages) Semtech Corporation – High Performance Wide Input Range Dual Synchronous Buck Controller

SC2442/H
POWER MANAGEMENT
Pin Descriptions
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Pin Name
AVCC
BDI
VIN
OC1
EA1
FB1
SS1
BST1
GD1H
PH1
GD1L
PGND
PVCC
GD2L
PH2
GD2H
BST2
SS2
FB2
EA2
OC2
SYNC/EN
ROSC
AGND
Pin Function
Supply voltage for analog circuit.
Regulated by the BDI pin to 7V from VIN using an external PNP transistor.
Base drive for AVCC/PVCC regulator.
Input supply voltage. Maximum is 30V for SC2442 and 36V for SC2442H.
High side current sense for VOUT1. Threshold is 100 mV.
Error amplifier output for compensation for the VOUT1.
Feedback input for the VOUT1.
Soft start pin for VOUT1. A capacitor to AGND sets the soft start period.
Boost capacitor connection for the VOUT1 high side gate drive.
Connect an external capacitor and a diode as shown in the Typical Application Circuit.
Gate drive for the high side MOSFET of VOUT1. 180 degrees out of phase with GD2H.
Switching node for VOUT1 external inductor connection.
Gate drive for low side MOSFET of VOUT1.
Power ground for gate drive return currents.
Supply voltage for output drivers.
Gate drive for low side MOSFET of VOUT2.
Switching node for VOUT2 external inductor connection.
Gate drive for the high side MOSFET of VOUT2. 180 degrees out of phase with GD1H.
Boost capacitor connection for the VOUT2 high side gate drive.
Connect an external capacitor and a diode as shown in the Typical Application Circuit.
Soft start pin for VOUT2. A capacitor to AGND sets the soft start period.
Feedback input for the VOUT2.
Error amplifier output for compensation for the VOUT2.
High side current sense for VOUT2. Threshold is 100 mV.
Oscillator synchronization and PWM Enable pin.
Oscillator frequency programming pin. Connect a resistor to AGND to set clock frequency.
Analog signal ground.
© 2007 Semtech Corp.
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