SC112_01 Datasheet, PDF (1/5 Pages) Semtech Corporation – 150mA ULTRA LOW DROPOUT MICROPOWER LINEAR REGULATOR

POWER MANAGEMENT
Description
SC112
150mA Ultra Low Dropout
Micropower Linear Regulator
PRELIMINARY
Features
The SC112 is a 150mA ultra low dropout linear regulator
with a built in CMOS/TTL logic level enable, designed
specifically for battery powered applications where low
quiescent current and low dropout are critical for battery
longevity.
The SC112 uses a Semtech proprietary internal PNP
device for the pass element, providing a low dropout
voltage of 130mV at a load of 60mA.
The output noise is reduced to 30µV (typical) by placing a
very low leakage 10nF capacitor on pin 3 (noise bypass).
Each device contains a bandgap reference, error
amplifier, PNP pass element, thermal and current
limiting circuitry and resistor divider network for setting
output voltage.
The SC112 is packaged in a six lead SOT-23 surface
mount package for a very small footprint and it requires
only a 1µF capacitor on the output and a 0.01µF on the
bypass pin for a minimum number of external
components.
u Low dropout voltage
u CMOS/TTL compatible control switch
u Very low quiescent current 60µA (ON, no load)
u Internal thermal shutdown
u Short circuit protection
u Very low standby current 0.1µA maximum (OFF)
u Low noise with external bypass capacitor
u Industrial temperature range
u SOT-23-6 package
Applications
u Battery powered systems
u Cellular telephones
u Cordless telephones
u Pagers
u Personal digital assistants
u Portable instrumentation
u Low voltage systems
Typical Application Circuit
U1 SC112
EN
1 _EN
VIN ⁶
VIN
2
5
GND GND
3 _{BYP VO} 4
VO
C1
10nF
C2
C3
1uF
1uF
Notes:
(1) C_IN (C3) is needed if the device is far from the supply’s filter capacitors, or for operation from a battery. A value
of 1.0µF or greater should be used. C_IN may be tantalum or ceramic.
(2) C_O (C2) should be a 1µF or greater tantalum or ceramic capacitor, with an Equivalent Series Resistance (ESR)
between 10mW and 1W over temperature. Larger value capacitors will improve the overall transient response.
(3) C_BYP (C1 - required) should be placed as close as possible to pin 3 and ground. A 10nF ceramic capacitor is
recommended.
(4) EN may be tied to V_IN if the shutdown feature is not required. Maximum EN voltage = V_IN.
(5) Connect both ground pins (2 and 5) to ground to maximize heat conduction.
Revision 1, January 2001
1
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