TC2054/2055/2186
50mA, 100mA, and 150mA CMOS LDOs
with Shutdown and Error Output
Features
General Description
• Very Low Supply Current (55µA Typ.) for Longer
Battery Life
The TC2054, TC2055 and TC2186 are high accuracy
(typically ±0.4%) CMOS upgrades for older (bipolar)
low dropout regulators. Designed specifically for bat-
tery-operated systems, the devices’ total supply current
is typically 55µA at full load (20 to 60 times lower than
in bipolar regulators).
• Very Low Dropout Voltage: 140mV (Typ.) @
150mA
• High Output Voltage Accuracy: ±0.4% (Typ)
• Standard or Custom Output Voltages
• Power-Saving Shutdown Mode
The devices’ key features include ultra low noise oper-
ation, very low dropout voltage - typically 45mV
(TC2054); 90mV (TC2055); and 140mV (TC2186) 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 exces-
sive output current). Supply current is reduced to 0.5µA
• ERROR Output Can Be Used as a Low Battery
Detector or Processor Reset Generator
• Fast Shutdown Reponse Time: 60µsec (Typ)
• Over-Current Protection
• Space-Saving 5-Pin SOT-23A Package
• Pin Compatible Upgrades for Bipolar Regulators
(max) and both V
and ERROR are disabled when
OUT
the shutdown input is low. The devices also incorporate
over-current protection.
Applications
The TC2054, TC2055 and TC2186 are stable with a
low esr ceramic output capacitor of 1µF and have a
maximum output current of 50mA, 100mA and 150mA,
respectively. This LDO Family also features a fast
response time (60µsec typically) when released from
shutdown.
• Battery Operated Systems
• Portable Computers
• Medical Instruments
• Instrumentation
• Cellular / GSMS / PHS Phones
• Pagers
Typical Application
Device Selection Table
1
5
V
V
V
V
OUT
IN
IN
OUT
Junction Temp.
Part Number
Package
Range
1µF
1µF
TC2054-xxVCT 5-Pin SOT-23A*
TC2055-xxVCT 5-Pin SOT-23A*
TC2186-xxVCT 5-Pin SOT-23A*
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
2
GND
TC2054
TC2055
TC2186
1M
Note:
*5-Pin SOT-23A is equivalent to EIAJ (SC-74A).
3
4
SHDN
ERROR
ERROR
Package Type
Shutdown Control
(from Power Control Logic)
VOUT
ERROR
4
5
TC2054
TC2055
TC2186
2
3
1
5-Pin SOT-23A*
TOP VIEW
VIN
GND SHDN
2002 Microchip Technology Inc.
DS21663B-page 1