2002 Microchip Technology Inc.
DS21437B-page 1
TC57
Features
" Low Dropout Voltage: 100mV @ 650mA with
FZT749 PNP Transistor
" 2.7V to 8V Supply Range
" Low Operating Current: 50礎 Operating,
0.2礎 Shutdown
" Low True Chip Enable
" Output Accuracy < ?%
" Small Package: 5-Pin SOT-23A
Applications
" Battery Operated Systems
" Portable Instruments
" High-Efficiency Linear Regulator
" Post-Regulator for SMPS
" Power Supply or Battery Back-Up Supply for
Memory
Device Selection Table
Other output voltages and package options are available.
Please contact Microchip Technology Inc. for details.
Package Type
General Description
The TC57 is a low dropout regulator controller that
operates with an external PNP pass transistor, allowing
the user to tailor the LDO characteristics to suit the
application at hand. This results in lower dropout
operation (and often lower cost) compared with
traditional linear regulators with on-board pass
transistors. The maximum output current of a TC57-
based regulator circuit is limited only by the
characteristics of the external pass transistor. For
example, a maximum output current of 650mA (with a
dropout voltage of 100mV) results when an FZT749
pass transistor is used, while a Darlington configuration
can deliver up to 4A.
Flexibility, and superior performance make this family
of regulator controllers the ideal choice in applications
where low dropout voltage and low installed cost are
key.
Functional Block Diagram
Part Number
Output
Voltage
Package
Temperature
Range
TC572502ECT 2.5V 5-Pin SOT-23A -40癈 to +85癈
TC573002ECT 3.0V 5-Pin SOT-23A -40癈 to +85癈
TC573302ECT 3.3V 5-Pin SOT-23A -40癈 to +85癈
SHDN
5
5-Pin SOT-23A
TC57
1
3
4
EXT
2
V
IN
V
OUT
GND
NOTE: 5-Pin SOT-23A is equivalent to the EIAJ SC-74A.
TC573002ECT
V
OUT
GND
SHDN
V
IN
EXT
C
IN
10礔
(Tantalum)
FZT749
Q1
R
B
1K
C
L
10礔
(Tantalum)
R
L
V
IN
+3.3V
R
BE
47K
1
2
ON
OFF
3
4
5
V
OUT
+3V
3.3V Line Input, 3.0V, 500mA Output LDO
Line Regulator Controller
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