SC2544 View Datasheet(PDF) - Semtech Corporation
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SC2544 Datasheet PDF : 24 Pages
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SC2544
POWER MANAGEMENT
Pin Descriptions for SC2544MLTRT (MLPQ)
Pin # Pin Name
Pin Function
1
FB1 Negative input of the error amplifier for output1.
2
ERROUT1 Error amplifier output for buck converter1.
3
SS1 An external capacitor connected from this pin to AGND sets the soft-start time.
Disable output1 by pulling this pin below 1V.
4
ILIM1 An external resistor connected from this pin to PHASE1 sets the over current shutdown trip
point.
5
BST1 Boost capacitor connection for output1 high side gate drive.
Connect an external capacitor as shown in the typical application circuit.
6
DRVH1 Gate drive for the high side MOSFET of output1. 180 degrees out of phase with DRVH2.
7
PHASE1 Phase node for output 1.
8
DRVL1 Low side gate drive for output 1.
9
PGND Power ground of low-side drivers.
10
PVCC Supply voltage for low-side gate drivers.
11
DRVL2 Low-side gate drive for output 2.
12
PHASE2 Phase node for output 2.
13
DRVH2 Gate drive for the high side MOSFET of output2. 180 degrees out of phase with DRVH1.
14
BST2 Boost capacitor connection for output2 high side gate drive.
Connect an external capacitor as shown in the typical application circuit.
15
ILIM2 An external resistor connected from this pin to PHASE2 sets the over current shutdown trip
point.
16
SS2
An external capacitor connected from this pin to AGND sets the soft-start time.
Disable output1 by pulling this pin below 1V.
17 ERROUT2 Error amplifier output for buck converter2.
18
FB2
Negative input of the error amplifier of output2.
19
PWRGD Open collector output. It is internally pulled low when either output is below the power good
threshold level.
20
ROSC A resistor from this pin to AGND sets oscillator frequency.
21
AGND Analog signal ground. Star connected to the system ground plane.
22
VIN
Input supply voltage. The range is from 4.5V to 28V.
23
VCC 10V regulator output. Supply voltage for the gate drivers. Connect to VIN pin when Vin<10V.
24
EN
When EN pin is low all outputs are disabled. Typical shutdown current is 100nA.
2005 Semtech Corp.
6
www.semtech.com
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