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PDF TC573002 Data sheet ( Hoja de datos )
| Número de pieza | TC573002 | |
| Descripción | (TC572502/3002/3302) Line Regulator Controller | |
| Fabricantes | Microchip Technology | |
| Logotipo |  |
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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
1 page  
TC57
3.4 Input Capacitor
The addition of an input capacitor further reduces
output noise, and negates the effects of power supply
input impedance. A 10µF (min) Tantalum capacitor is
recommended.
3.5 Shutdown Mode
The TC57 enters a low power shutdown mode when
the shutdown input (SHDN) is high. During shutdown,
the regulator is disabled, the output capacitor is
discharged through the load, and supply current to the
TC57 decreases to less than 1µA. Normal operation
resumes when SHDN is brought low. If the shutdown
mode is not used, SHDN should be tied to VIN.
TABLE 3-1: COMPONENT SUPPLIERS
Device
CAPACITORS
267 Series
F95 Tantalum Series
595 Tantalum Series
OS-CON Series
LXF Series
TRANSISTORS
ZTX749
2N4403
2N2907A
FZT749
Mounting
Method
Manufacturer
Website
Surface Mount
Surface Mount
Surface Mount
Through-Hole
Through-Hole
Matsuo
Nichicon
Sprague
Sanyo
United Chemi-Con
http://www.matsuoelectronics.com
http://www.nichicon-us.com
http://www.vishay.com/brands/sprague
http://www.sanyovideo.com
http://chemi-con.com
Through-Hole
Through-Hole
Through-Hole
Surface Mount
Zetex
ON SEMI
ON SEMI
Zetex
http://www.zetex.com
http://www.onsemi.com/home
http://www.onsemi.com/home
http://www.zetex.com
© 2002 Microchip Technology Inc.
DS21437B-page 5
5 Page 
5.3 Package Dimensions
SOT-23A-5
.075 (1.90)
REF.
TC57
.122 (3.10)
.098 (2.50)
.071 (1.80)
.059 (1.50)
.020 (0.50)
.012 (0.30)
PIN 1
.037 (0.95)
REF.
.122 (3.10)
.106 (2.70)
.057 (1.45)
.035 (0.90)
.006 (0.15)
.000 (0.00)
10° MAX.
.024 (0.60)
.004 (0.10)
.010 (0.25)
.004 (0.09)
Dimensions: inches (mm)
© 2002 Microchip Technology Inc.
DS21437B-page 11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet TC573002.PDF ] | |
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