SC4503 Просмотр технического описания (PDF) - Semtech Corporation
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SC4503 Datasheet PDF : 22 Pages
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SC4503
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Unless specified: VIN = VSHDN/SS = 3V, -40°C < TA = TJ < 85°C
Parameter
SHDN/SS Switching Threshold
Shutdown Input High Voltage
Shutdown Input Low Voltage
SHDN/SS Pin Bias Current
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Conditions
VFB = 0V
VSHDN/SS = 2V
VSHDN/SS = 1.8V
VSHDN/SS = 0V
Min
Typ
Max Units
1.4
V
2
V
0.4
22
50
20
45
µA
0.1
155
°C
10
Pin Configuration - TSOT - 23
Ordering Information
Top View
Device(1,2)
Top Mark
Package
SW 1
GND 2
FB 3
5 IN
4 SHDN/SS
5-LEAD TSOT-23
SC4503TSKTRT
BH00
TSOT-23
SC4503EVB
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.
Pin Descriptions - TSOT -23
Pin Pin Name Pin Functions
1
SW
Collector of the internal power transistor. Connect to the boost inductor and the freewheeling
diode. The maximum switching voltage spike at this pin should be limited to 34V.
2
GND Ground. Tie to ground plane.
3
FB
The inverting input of the error amplifier. Tie to an external resistive divider to set the output volt-
age.
Shutdown and Soft-start Pin. Pulling this pin below 0.4 shuts down the converter. Applying more
than 2V at this pin enables the SC4503. An external resistor and an external capacitor con-
nected to this pin soft-start the switching regulator. The SC4503 will try to pull the SHDN/SS pin
4
SHDN/SS 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
IN
Power Supply Pin. Bypassed with capacitor close to the pin.
2007 Semtech Corp.
3
www.semtech.com
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