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Extremely Low Supply Current for Longer Battery Life
Very Low Dropout Voltage
300mA Output Current
Standard or Custom Output Voltages
ERROR Output Can Be Used as a Low Battery
Detector or Processor Reset Generator
Power Saving Shutdown Mode
Bypass Input for Ultra Quiet Operation
Over Current and Over Temperature Protection
Space-Saving MSOP Package Option
General Description
The TC1173 is a precision output (typically 鹵0.5%)
CMOS low dropout regulator. Total supply current is
typically 50碌A(chǔ) at full load (20 to 60 times lower than in
bipolar regulators).
TC1173 key features include ultra low noise operation
(plus optional Bypass input); very low dropout voltage
(typically 240mV at full load) and internal feed-forward
compensation for fast response to step changes in
load. An error output (ERROR) is asserted when the
TC1173 is out-of-regulation (due to a low input voltage
or excessive output current). ERROR can be set as a
low battery warning or as a processor RESET signal
(with the addition of an external RC network). Supply
current is reduced to 0.05碌A(chǔ) (typical) and V
OUT
and
ERROR fall to zero when the shutdown input is low.
The TC1173 incorporates both over temperature and
over current protection. The TC1173 is stable with an
output capacitor of only 1碌F and has a maximum
output current of 300mA.
Applications
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Battery Operated Systems
Portable Computers
Medical Instruments
Instrumentation
Cellular/GSM/PHS Phones
Linear Post-Regulators for SMPS
Pagers
Typical Application
V
OUT
1
Device Selection Table
Part Number
TC1173-xxVOA
TC1173-xxVUA
Package
8-Pin SOIC
8-Pin MSOP
Junction
Temp. Range
-40擄C to +125擄C
-40擄C to +125擄C
+
C1
1碌F
2
V
OUT
V
IN
8
V
IN
GND
NC
7
R3
1M
TC1173
3
NC
SHDN
6
NOTE:
xx indicates output voltages
Available Output Voltages: 2.5, 2.8, 3.0, 3.3, 5.0.
Other output voltages are available. Please contact Microchip
Technology Inc. for details.
4
Bypass
ERROR
5
ERROR
C
BYPASS
470pF
(Optional)
Shutdown Control
(from Power Control Logic)
Package Type
8-Pin MSOP
V
OUT
GND
NC
Bypass
1
2
3
4
8
8-Pin SOIC
V
IN
NC
SHDN
ERROR
V
OUT
1
GND 2
NC 3
Bypass 4
TC1173VOA
8 V
IN
7 NC
6 SHDN
5 ERROR
7
6
5
TC1173VUA
2002 Microchip Technology Inc.
DS21362B-page 1
漏
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