SC5205 Datasheet, PDF (1/5 Pages) Semtech Corporation – 150mA Ultra Low Dropout, Low Noise Micropower Linear Regulator

SC5205
150mA Ultra Low Dropout, Low
Noise Micropower Linear Regulator
POWER MANAGEMENT
Description
Features
PRELIMINARY
The SC5205 is a 150mA ultra low dropout linear
regulator with a built in CMOS/TTL logic level enable
switch. It is designed specifically for battery powered
applications where low quiescent current and low
dropout are critical for battery longevity.
The SC5205 uses a Semtech proprietary internal PNP
device for the pass element, providing a low dropout
voltage of 165mV at a load of 150mA, while maintaining
a ground pin current of 2750µA.
u Ultra low dropout voltage - 165mV @ 150mA
u Guaranteed 150mA output current
u Low ground pin current at all loads
u <5µA quiescent current in shutdown
u Wide input supply voltage range 2.5V to 16V in
u Wide output voltage range
u Excellent line regulation
u Industrial temperature range
u Surface mount packaging (5 pin SOT-23)
The output noise is reduced by placing a 10nF capacitor
on pin 4 (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 SC5205 is packaged in a 5 pin 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 amount of external components.
Applications
u Battery Powered Systems
u Cellular Telephones
u Cordless Telephones
u Pagers
u Personal Digital Assistants
u Portable Instrumentation
u Cameras
u Portable Consumer Equipment
u PCMCIA cards
Typical Application Circuit
VIN
EN
+ C1
1uF
U1 SC5205
1 _VIN
VO ⁵
2 _GND
3 _EN
BYP ⁴
VO
C2
10nF
+ C3
1uF
Notes:
(1) C_IN (C1) 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 aluminum electrolytic.
(2) C_O (C3) should be a 1µF or greater tantalum or aluminum electrolytic capacitor. Larger value capacitors will
improve the overall transient response.
(3) C_BYP (C2 - required) should be placed as close as possible to pin 4 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.
Revision 1, January 2001
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