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TC1187

Description
Low Dropout Voltage Regulator
File Size267KB,17 Pages
ManufacturerMicrochip
Websitehttps://www.microchip.com
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TC1187 Overview

Low Dropout Voltage Regulator

TC1070/TC1071/TC1187
50 mA, 100 mA and 150 mA Adjustable CMOS LDOs with Shutdown
Features:
50 µA Ground Current for Longer Battery Life
Adjustable Output Voltage
Very Low Dropout Voltage
Choice of 50 mA (TC1070), 100 mA (TC1071)
and 150 mA (TC1187) Output
Power-Saving Shutdown mode
Overcurrent and Overtemperature Protection
Space-Saving 5-Pin SOT-23 Package
Pin Compatible with Bipolar Regulators
Description:
The TC1070, TC1071 and TC1187 devices are
adjustable LDOs designed to supersede a variety of
older (bipolar) voltage regulators. Total supply current
is typically 50 µA 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 85 mV
(TC1070), 180 mV (TC1071) and 270 mV (TC1187) at
full load and fast response to step changes in load.
Supply current is reduced to 0.5 µA (maximum) when
the shutdown input is low. The devices incorporate both
overtemperature and overcurrent protection. Output
voltage is programmed with a simple resistor divider
from V
OUT
to ADJ to GND.
The TC1070, TC1071 and TC1187 devices are stable
with an output capacitor of only 1 µF and have a
maximum output current of 50 mA, 100 mA and
150 mA, respectively. For higher output versions
please see the TC1174 (I
OUT
= 300 mA) data sheet
(DS21363).
Applications:
Battery Operated Systems
Portable Computers
Medical Instruments
Instrumentation
Cellular/GSM/PHS Phones
Linear Post-Regulators for SMPS
Pagers
Typical Application
V
IN
1
V
IN
V
OUT
5
C1 +
1 µF
R1
V
OUT
Package Type
5-Pin SOT-23
V
OUT
5
TC1070
TC1071
TC1187
R2
TC1070
TC1071
TC1187
2 GND
ADJ
4
3
SHDN
ADJ
4
1
V
IN
2
3
GND SHDN
Shutdown Control
(from Power Control Logic)
R1
V
OUT
= V
REF
------ + 1
-
R2
2010 Microchip Technology Inc.
DS21353E-page 1

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Description Low Dropout Voltage Regulator Low Dropout Voltage Regulator Low Dropout Voltage Regulator
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