SC4503 Просмотр технического описания (PDF) - Semtech Corporation
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SC4503 Datasheet PDF : 22 Pages
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SC4503
POWER MANAGEMENT
Pin Configuration - 2mm X 2mm MLPD
Top View
SW 1
SW 2
IN 3
SHDN/SS 4
8 NC
7 GND
6 GND
5 FB
Ordering Information
Device(1,2)
Top Mark
Package
SC4503WLTRT
E00
2mmX2mm
MLPD-W
SC4503_MLPD EVB
Evaluation Board
Notes:
(1) Available in tape and reel only. A reel contains 3,000 devices.
(2) Available in lead-free package only. Device is WEEE and
RoHS compliant.
8-LEAD 2X2mm MLPD-W
Pin Descriptions - 2X2mm MLPD-W
Pin
Pin Name
Pin Functions
Collector of the internal power transistor. Connect to the boost inductor and the free-
1,2
SW
wheeling diode. The maximum switching voltage spike at this pin should be limited to
34V.
3
IN
Power Supply Pin. Bypassed with capacitor close to the pin.
Shutdown and Soft-start Pin. Pulling this pin below 0.4 shuts down the converter. Apply-
ing more than 2V at this pin enables the SC4503. An external resistor and an external
capacitor connected to this pin soft-start the switching regulator. The SC4503 will try
4
SHDN/SS
to pull the SHDN/SS pin below its 1.4V switching threshold regardless of the external
circuit attached to the pin if VIN is below the under-voltage lockout threshold. Tie this pin
through an optional resistor to IN or to the output of a controlling logic gate if soft-start is
not used. See Applications Information for more details.
5
FB
The inverting input of the error amplifier. Tie to an external resistive divider to set the
output voltage.
6,7
GND
Ground. Tie to ground plane.
8
N.C.
No Connection.
EDP
Solder to the ground plane of the PCB.
2007 Semtech Corp.
4
www.semtech.com
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