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Microchip Technology - (TC572502/3002/3302) Line Regulator Controller

Numéro de référence TC573302
Description (TC572502/3002/3302) Line Regulator Controller
Fabricant Microchip Technology 
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TC573302 fiche technique
TC57
Line Regulator Controller
Features
• Low Dropout Voltage: 100mV @ 650mA with
FZT749 PNP Transistor
• 2.7V to 8V Supply Range
• Low Operating Current: 50µA Operating,
0.2µA Shutdown
• Low True Chip Enable
• Output Accuracy < ±2%
• 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
Part Number
Output
Voltage
Package
Temperature
Range
TC572502ECT 2.5V 5-Pin SOT-23A -40°C to +85°C
TC573002ECT 3.0V 5-Pin SOT-23A -40°C to +85°C
TC573302ECT 3.3V 5-Pin SOT-23A -40°C to +85°C
Other output voltages and package options are available.
Please contact Microchip Technology Inc. for details.
Package Type
5-Pin SOT-23A
SHDN
EXT
54
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
VIN +3.3V
FZT749
Q1
VOUT +3V
CIN
10µF
(Tantalum)
OFF
ON
RBE
47K
RB
1K
4
EXT
2 VIN
VOUT 3
TC573002ECT
5
SHDN
GND
1
CL
10µF
(Tantalum)
RL
3.3V Line Input, 3.0V, 500mA Output LDO
TC57
1 23
GND VIN VOUT
NOTE: 5-Pin SOT-23A is equivalent to the EIAJ SC-74A.
© 2002 Microchip Technology Inc.
DS21437B-page 1

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