SC1480A View Datasheet(PDF) - Semtech Corporation
Part Name
Description
Manufacturer
SC1480A Datasheet PDF : 23 Pages
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SC1480A
POWER MANAGEMENT
Pin Configuration
TOP VIEW
REFIN
1
TON
2
REFOUT
3
VCCA
4
FB
5
PGD
6
VSSA
7
14
BST
13
DH
12
LX
11
ILIM
10
VDDP
9
DL
8
PGND
Ordering Information
Device (1)
Package
SC1480AITSTRT(2)
TSSOP-14
SC1480AEVB
Evaluation Board
Notes:
(1) Only available in tape and reel packaging. A reel
contains 2500 devices.
(2) Lead free product. This product is fully WEEE, RoHS
and J-STD-020B compliant.
(14 Pin TSSOP)
Pin Descriptions
Pin # Pin Name Pin Function
1
REFIN Reference input. A 10kOhm + 10kOhm resistor divider from VDDQ to VSSA sets this voltage. A
0.1µF input filter capacitor is recommended.
2
TON This pin is used to sense VBAT through a pull-up resistor, RTON, and to set the top MOSFET on-
time. Bypass this pin with a 1nF ceramic capacitor to VSSA.
3
REFOUT Buffered REFIN output. The switching controller regulates to this voltage. Connect a series 10
Ohm and 1µF from this pin to VSSA.
4
VCCA Supply voltage input for the analog supply. Use a 10 Ohm/1µF RC filter from 5VSUS to VSSA.
5
FB
Feedback input. Connect to the output at the output capacitor.
6
PGD Power Good open drain NMOS output. Goes high after a fixed clock cycle delay (440 cycles)
following power up.
7
VSSA Ground reference for analog circuitry. Connect to bottom of the output capacitor(s).
8
PGND Power ground.
9
DL
Gate drive output for the low side MOSFET switch.
10
VDDP +5V supply voltage input for the gate drivers. Decouple this pin with a 1µF ceramic capacitor to
PGND.
11
ILIM
Current limit input pin. Connect to drain of low-side MOSFET for RDS(ON) sensing or the source
for resistor sensing through a threshold sensing resistor.
12
LX
Phase node (junction of top and bottom MOSFETs and the output inductor) connection.
13
DH
Gate drive output for the high side MOSFET switch.
14
BST Boost capacitor connection for the high side gate drive.
2003 Semtech Corp.
6
www.semtech.com
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