SC1480
POWER MANAGEMENT
Pin Configuration
Ordering Information
(1)
Device
Package
TOP VIEW
SC1480ITSTR
SC1480ITSTRT(2)
SC1480EVB
TSSOP-14
TSSOP-14
REFIN
TON
REFOUT
VCCA
FBK
PGOOD
AGND
1
2
3
4
5
6
7
14
13
12
11
10
9
BST
DH
LX
ILIM
VDDP
DL
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 and
RoHS compliant.
8
PGND
(14 Pin TSSOP)
Pin Descriptions
Pin #
Pin Name Pin Function
1
2
3
4
5
6
REFIN
TON
External Reference input. Tie to ground to disable SMPS and reference buffer.
On-time set input. Sets on-time of upper MOSFET via series resistor to the input supply.
REFOUT Reference output pin. Can source 3mA.
VCCA
FBK
Supply voltage input for the analog supply. Connect through a RC filter to +5V.
Feedback input. Connect from resistor divider at output of SMPS to select output voltage.
PGOOD
Power Good open drain NMOS output. Goes high after a fixed clock cycle delay following power
up.
7
8
AGND
PGND
DL
Analog ground.
Power ground.
9
Gate drive output for the low side MOSFET switch.
+5V supply voltage input for the gate drivers. Tie to ground to disable SMPS.
10
11
VDDP
ILIM
Current limit input. Connect to drain of low-side MOSFET for RDS(on) sensing or the source for
resistor sensing through a threshold sensing resistor. See applications section for more
information.
12
13
14
LX
DH
Switching node inductor connection.
Gate drive output for the high side MOSFET switch.
Boost capacitor connection for the high side gate drive.
BST
2006 Semtech Corp.
5
www.semtech.com
SEMTECH [ SEMTECH CORPORATION ]
