TC1072/TC1073
50mA and 100mA CMOS LDOs with Shutdown, ERROR Output and VREF Bypass
Features:
General Description
• 50 µA Ground Current for Longer Battery Life
• Very Low Dropout Voltage
The TC1072 and TC1073 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 50 µA at full load
(20 to 60 times lower than in bipolar regulators).
• Choice of 50 mA (TC1072) and 100 mA (TC1073)
Output
• High Output Voltage Accuracy
• Standard or Custom Output Voltages
• Power-Saving Shutdown Mode
The devices’ key features include ultra low noise
operation (plus optional Bypass input); very low
dropout voltage (typically 85 mV, TC1072 and 180 mV,
TC1073 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 0.5 µA (max)
and both VOUT and ERROR are disabled when the
shutdown input is low. The devices incorporate both
overtemperature and overcurrent protection.
• ERROR Output Can Be Used as a Low Battery
Detector or Processor Reset Generator
• Bypass Input for Ultra Quiet Operation
• Overcurrent and Overtemperature Protection
• Space-Saving 6-Pin SOT-23 Package
• Pin Compatible Upgrades for Bipolar Regulators
• Standard Output Voltage Options:
- 1.8V, 2.5V, 2.6V, 2.7V, 2.8V, 2.85V, 3.0V,
3.3V, 3.6V, 4.0V, 5.0V
• Other output voltages are available. Please
contact Microchip Technology Inc. for details.
The TC1072 and TC1073 are stable with an output
capacitor of only 1 µF and have a maximum output
current of 50 mA, and 100 mA, respectively. For higher
output current versions, please see the TC1185,
TC1186, TC1187 (IOUT = 150 mA) and TC1107,
TC1108 and TC1173 (IOUT = 300 mA) data sheets.
Applications:
• Battery Operated Systems
• Portable Computers
• Medical Instruments
• Instrumentation
• Cellular/GSM/PHS Phones
• Linear Post-Regulators for SMPS
• Pagers
Package Type
6-Pin SOT-23
VOUT Bypass ERROR
Typical Application Circuit
5
6
4
R
P
1
2
6
5
V
V
V
V
OUT
IN
IN
OUT
+
TC1072
TC1073
1 µF
GND
Bypass
C
3
1
BYPASS
470 pF
2
VIN
GND SHDN
3
4
ERROR
SHDN
ERROR
Shutdown Control
(from Power Control Logic)
© 2007 Microchip Technology Inc.
DS21354D-page 1