TC1174 Datasheet, PDF (1/12 Pages) Microchip Technology – 300mA CMOS LDO with Shutdown and VREF Bypass

TC1174
300mA CMOS LDO with Shutdown and V_REF Bypass
Features
• Extremely Low Supply Current (50µA, Typ.)
• Very Low Dropout Voltage
• 300mA Output Current
• Adjustable Output Voltages
• Power Saving Shutdown Mode
• Bypass Input for Ultra Quiet Operation
• Over Current and Over Temperature Protection
• Space-Saving MSOP Package Option
Applications
• Battery Operated Systems
• Portable Computers
• Medical Instruments
• Instrumentation
• Cellular/GSM/PHS Phones
• Linear Post-Regulators for SMPS
• Pagers
Device Selection Table
Part Number
Output
Voltage
(V)
Package
Junction
Temp. Range
TC1174VOA Adjustable 8-Pin SOIC -40°C to +125°C
TC1174VUA Adjustable 8-Pin MSOP -40°C to +125°C
Package Type
8-Pin MSOP
V_OUT 1
8 V_IN
GND 2 _TC1174VUA 7 NC
NC 3
6 SHDN
ADJ 4
5 Bypass
8-Pin SOIC
V_OUT 1
8 V_IN
GND 2 _TC1174VOA 7 NC
NC 3
6 SHDN
ADJ 4
5 Bypass
General Description
The TC1174 is an adjustable output CMOS low dropout
regulator. Total supply current is typically 50µA at full
load (20 to 60 times lower than in bipolar regulators).
TC1174 key features include ultra low noise operation
(plus optional Bypass input); very low dropout voltage
(typically 270mV at full load) and internal feed-forward
compensation for fast response to step changes in
load. Supply current is reduced to 0.05µA (typical) and
V_OUT falls to zero when the shutdown input is low.
The TC1174 incorporates both over temperature and
over current protection. The TC1174 is stable with an
output capacitor of only 1µF and has a maximum
output current of 300mA.
Typical Application
V_OUT
+
C1
1µF
R1
470K
R2
470K
1 _VOUT
V_IN ⁸
V_IN
2
GND
7
NC
TC1174
3 NC
6
SHDN
4 _ADJ
5
Bypass
[ ] ^VOUT ^{= V}REF ^{x —RR12 + 1}
NC
Shutdown
Control
(from Power
Control Logic)
C_BYPASS
470pF
(Optional)
© 2002 Microchip Technology Inc.
DS21363B-page 1