TC57
Line Regulator Controller
Features
鈥?Low Dropout Voltage: 100mV @ 650mA with
FZT749 PNP Transistor
鈥?2.7V to 8V Supply Range
鈥?Low Operating Current: 50碌A Operating,
0.2碌A Shutdown
鈥?Low True Chip Enable
鈥?Output Accuracy < 卤2%
鈥?Small Package: 5-Pin SOT-23A
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.
Applications
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
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
Part Number
TC572502ECT
TC573002ECT
TC573302ECT
Output
Voltage
2.5V
3.0V
3.3V
Package
Temperature
Range
Functional Block Diagram
V
IN
+3.3V
FZT749
Q1
V
OUT
+3V
5-Pin SOT-23A -40掳C to +85掳C
5-Pin SOT-23A -40掳C to +85掳C
5-Pin SOT-23A -40掳C to +85掳C
R
BE
47K
C
IN
10碌F
(Tantalum)
R
B
1K
4
EXT
V
IN
2
V
OUT
3
C
L
10碌F
(Tantalum)
R
L
OFF
TC573002ECT
ON
5
SHDN
GND
1
Other output voltages and package options are available.
Please contact Microchip Technology Inc. for details.
Package Type
3.3V Line Input, 3.0V, 500mA Output LDO
5-Pin SOT-23A
SHDN
5
EXT
4
TC57
1
GND
2
V
IN
3
V
OUT
NOTE:
5-Pin SOT-23A is equivalent to the EIAJ SC-74A.
2002 Microchip Technology Inc.
DS21437B-page 1
漏
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