TC1054 Datasheet, PDF (2/18 Pages) TelCom Semiconductor, Inc – 50mA CMOS LDO WITH SHUTDOWN AND ERROR OUTPUT

TC1054/TC1055/TC1186
General Description
The TC1054, TC1055 and TC1186 are high accuracy
(typically ±0.5%) CMOS upgrades for older (bipolar)
low dropout regulators. Designed specifically for
battery-operated systems, the devices’ CMOS
construction eliminates wasted ground current,
significantly extending battery life. Total supply current
is typically 50µA at full load (20 to 60 times lower than
in bipolar regulators).
The devices’ key features include ultra low noise
operation, very low dropout voltage – typically 85mV
(TC1054); 180mV (TC1055); and 270mV (TC1186) at
full load — and fast response to step changes in load.
An error output (ERROR) is asserted when the devices
are out-of-regulation (due to a low input voltage or
excessive output current). ERROR can be used as a
low battery warning or as a processor RESET signal
(with the addition of an external RC network). Supply
current is reduced to 0.5µA (max) and both V_OUT and
ERROR are disabled when the shutdown input is low.
The devices incorporate both over-temperature and
over-current protection.
The TC1054, TC1055 and TC1186 are stable with an
output capacitor of only 1µF and have a maximum
output current of 50mA, 100mA and 150mA,
respectively. For higher output current regulators,
please see the TC1173 (I_OUT = 300mA) data sheet.
Typical Application
1
V_IN
V_IN
5
V_OUT
V_OUT
TC1054
TC1055
TC1186
2 _GND
+
1µF
3
SHDN
4
ERROR
ERROR
Shutdown Control
(from Power Control Logic)
DS21350B-page 2
© 2002 Microchip Technology Inc.