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参数资料
| 型号： | TC572502ECTTR |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO5 |
| 封装： | SOT-23A, 5 PIN |
| 文件页数： | 1/16页 |
| 文件大小： | 462K |
| 代理商： | TC572502ECTTR |
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
A Operating,
0.2
A 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
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°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
SHDN
5
5-Pin SOT-23A
TC57
13
4
EXT
2
VIN
VOUT
GND
NOTE: 5-Pin SOT-23A is equivalent to the EIAJ SC-74A.
TC573002ECT
VOUT
GND
SHDN
VIN
EXT
CIN
10F
(Tantalum)
FZT749
Q1
RB
1K
CL
10
F
(Tantalum)
RL
VIN +3.3V
RBE
47K
1
2
ON
OFF
3
4
5
VOUT +3V
3.3V Line Input, 3.0V, 500mA Output LDO
Line Regulator Controller
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