SC1457 Datasheet, PDF (1/13 Pages) Semtech Corporation – 150mA Ultra Low Dropout Regulator with Undervoltage Flag

SC1457
150mA Ultra Low Dropout
Regulator with Undervoltage Flag
POWER MANAGEMENT
Description
Features
The SC1457 is a low dropout linear regulator that
operates from a +2.25V to +6.5V input range and
delivers up to 150mA. A PMOS pass transistor allows
the low 75µA supply current to remain independent of
load, making these devices ideal for battery operated
portable equipment such as cellular phones, cordless
phones and personal digital assistants.
The SC1457 has very low dropout voltage (typically 1.1mV
at light loads and 150mV at 150mA) with better than
1.5% initial output voltage accuracy. It has a logic
compatible enable control input and an internal output
undervoltage monitor.
Designed especially for hand held, battery powered
devices, the SC1457 can be switched by a CMOS or TTL
compatible logic signal. When disabled, power
consumption drops nearly to zero. Other features include
short circuit protection, thermal shutdown protection and
reverse battery protection.
The SC1457 is available in several fixed voltages in the
tiny 5 lead SOT-23 package and the ultra low profile 5
lead TSOT-23.
‹ Guaranteed 150mA output current
‹ Error flag indicates output undervoltage fault
‹ 2% output accuracy guaranteed over line, load and
temperature
‹ Very small external components - designed to work
with ceramic capacitors
‹ Low 110µV_RMS output noise
‹ Very low supply current
‹ Thermal overload protection
‹ Reverse battery protection
‹ Low power shutdown
‹ Full industrial temperature range
‹ Very low profile packaging available (1mm max.
height)
‹ Surface mount packaging (SOT-23-5 and
TSOT-23-5)
Applications
‹ Battery Powered Systems
‹ Cellular Telephones
‹ Cordless Telephones
‹ Personal Digital Assistants
‹ Portable Instrumentation
‹ Modems
‹ PCMCIA cards
Typical Application Circuit
VIN
C1
1uF
U1
1
IN
SC1457
5
OUT
3
4
EN GND FLG
2
R1 100k
VO
C2
1uF
UNDERVOLTAGE FLAG
Revision: November 10, 2004
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