Extremely Supply Current (50µA, Typ.) Very Dropout Voltage Guaranteed

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Extremely Supply Current (50µA, Typ.) Very Dropout Voltage Guaranteed

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TC1174 300mA Adjustable CMOS with Shutdown VREF Bypass
Extremely Supply Current (50µA, Typ.) Very Dropout Voltage Guaranteed 300mA Output Adjustable Output Voltage Power-Saving Shutdown Mode Bypass Input Ultra-Quiet Operation Over-Current Over-Temperature Protection Space-Saving MSOP Package Option
TC1174 adjustable output CMOS dropout regulator. Total supply current typically 50µA full load times lower than bipolar regulators!). TC1174 features include ultra noise operation (plus optional Bypass input); very dropout voltage (typically 240mV full load) internal feed-forward compensation fast response step changes load. Supply current reduced 0.05µA (typical) VOUT falls zero when shutdown input low. TC1174 incorporates both over-temperature over-current protection. TC1174 stable with output capacitor only maximum output current 300mA.
APPLICATIONS
Battery-Operated Systems Portable Computers Medical Instruments Instrumentation Cellular Phones Linear Post-Regulator SMPS Pagers
ORDERING INFORMATION
Part Number TC1174VOA TC1174VUA Output Voltage Adjustable Adjustable Junction Temperature Range
Package
8-Pin SOIC +125°C 8-PIn MSOP +125°C
TYPICAL APPLICATION
CONFIGURATION 8-Pin MSOP
VOUT 470K
VOUT
VOUT
TC1174VUA
SHDN Bypass
TC1174
SHDN Shutdown Control (from Power Control Logic) CBYPASS 470pF (Optional) VOUT VREF
8-Pin SOIC
VOUT Bypass
470K
Bypass
TC1174VOA SHDN
2001 Microchip Technology Inc.
DS21363A
TC1174-2 1/25/00
300mA Adjustable CMOS with Shutdown VREF Bypass TC1174
ABSOLUTE MAXIMUM RATINGS*
Input Voltage .6.5V Output Voltage (VSS 0.3) (VIN 0.3) Power Dissipation Internally Limited (Note Operating Temperature 40°C 125°C Storage Temperature 65°C +150°C Maximum Voltage +0.3V 0.3V Lead Temperature (Soldering, Sec.) +300°C
*Absolute Maximum Ratings indicate device operation limits beyond damage occur. Device operation beyond limits listed Electrical Characteristics recommended.
ELECTRICAL CHARACTERISTICS: VOUT 0.1µA, 3.3µF, SHDN VIH, 25°C, unless otherwise noted.
BOLDFACE type specifications apply junction temperatures 40°C +125°C
Symbol
IOUTMAX VREF VOUT/T VOUT/VIN VOUT/VOUT VOUT
Parameter
Input Operating Voltage Maximum Output Current Reference Voltage VOUT Temperature Coefficient Line Regulation Load Regulation Dropout Voltage (Note
Test Conditions
1.165
1.20 0.05 0.05 0.04
1.235 0.35
Units
ppm/°C
IISS1 ISS2 PSRR IOUTSC VOUT/PD
Supply Current Shutdown Supply Current Power Supply Rejection Ratio Output Short Circuit Current Thermal Regulation Output Noise
Note 0.1mA IOUTMAX (Note 0.1mA 100mA 300mA SHDN SHDN 1kHz VOUT Note 10kHz, IOUTMAX 470pF from Bypass
nV/Hz
SHDN Input
SHDN Input High Threshold SHDN Input Threshold %VIN %VIN
Input
IADJ Adjust Input Leakage Current
NOTES: VOUT (VOUTMAX VOUTMIN) VOUT Regulation measured constant junction temperature using duty cycle pulse testing. Load regulation tested over load range from 0.1mA maximum specified output current. Changes output voltage heating effects covered thermal regulation specification. Dropout voltage defined input output differential which output voltage drops below nominal value measured differential. Thermal Regulation defined change output voltage time after change power dissipation applied, excluding load line regulation effects. Specifications current pulse equal ILMAX 10msec. maximum allowable power dissipation function ambient temperature, maximum allowable junction temperature thermal resistance from junction-to-air (i.e. JA). Exceeding maximum allowable power dissipation causes device initiate
TC1174-2
1/25/00
2001 Microchip Technology Inc.
DS21363A
300mA Adjustable CMOS with Shutdown VREF Bypass TC1174
DETAILED DESCRIPTION
TC1174 adjustable dropout regulator. Unlike bipolar regulators, TC1174 supply current does increase with load current. addition, VOUT remains stable within regulation very load currents important consideration CMOS battery back-up applications). TC1174 functions detailed below:
VOUT 470K VOUT Battery Shutdown Control (from Power Control Logic) CBYPASS 470pF (Optional)
TC1174
SHDN
DESCRIPTIONS
470K
Bypass
Symbol
VOUT
Description
Regulated voltage output Ground terminal connect Output voltage adjust terminal. Output voltage setting programmed with resistor divider from VOUT this input. capacitor also added this input reduce output noise (see text). Reference bypass input. Connecting 470pF this input further reduces output noise. Shutdown control input. regulator fully enabled when logic high applied this input. regulator enters shutdown when logic applied this input. During shutdown, output voltage falls zero supply current reduced 0.05µA (typical). connect Unregulated supply input
Figure Typical Application Circuit
Bypass
SHDN
Output Capacitor (min) capacitor from VOUT ground required. output capacitor should have effective series resistance less. capacitor should connected from there more than inches wire between regulator filter capacitor, battery used power source. Aluminum electrolytic tantalum capacitor types used. (Since many aluminum electrolytic capacitors freeze approximately 30°C, solid tantalums recommended applications operating below 25°C.) When operating from sources other than batteries, supply-noise rejection transient response improved increasing value input output capacitors employing passive filtering techniques. Adjust Input output voltage setting determined values (Figure ohmic values these resistors should between 470K minimize bleeder current. output voltage setting calculated using: VOUT VREF
Figure shows typical application circuit. regulator enabled time shutdown input (SHDN) above VIH, shutdown (disabled) when SHDN below VIL. SHDN controlled CMOS logic gate, port microcontroller. SHDN input required, should connected directly input supply. While shutdown, supply current decreases 0.05µA (typical) VOUT falls zero. Bypass Input 470pF capacitor connected from Bypass input ground reduces noise present internal reference, which turn significantly reduces output noise. output noise concern, this input left unconnected. Larger capacitor values used, results longer time period rated output voltage when power initially applied.
2001 Microchip Technology Inc. DS21363A
Equation
voltage adjustment range TC1174 from VREF (VIN 0.05V).
Thermal Considerations
Thermal Shutdown Integrated thermal protection circuitry shuts regulator when temperature exceeds 150°C. regulator remains until temperature drops approximately 140°C.
TC1174-2 1/25/00
300mA Adjustable CMOS with Shutdown VREF Bypass TC1174
Power Dissipation amount power regulator dissipates primarily function input output voltage, output current. following equation used calculate worst case actual power dissipation: (VINMAX VOUTMIN)ILOADMAX Where: VINMAX VOUTMIN ILOADMAX worst case actual power dissipation maximum voltage minimum regulator output voltage maximum output (load) current
Equation
155mW Maximum allowable power dissipation: PDMAX (TJMAX TAMAX)
(125 350mW
maximum allowable power dissipation (Equation function maximum ambient temperature (TAMAX), maximum allowable temperature (125°C), thermal resistance from junction-to-air JA). 8-Pin SOIC package approximately 160°C/Watt, while 8-Pin MSOP package approximately 200°C/Watt; both when mounted single layer dielectric copper clad board. PDMAX (TJMAX TAMAX)
this example, TC1174 dissipates maximum only 155mW; below allowable limit 350mW. similar manner, Equation Equation used calculate maximum current and/or input voltage limits. example, maximum allowable found substituting maximum allowable power dissipation 350mW into Equation from which VINMAX 4.1V. Layout Considerations primary path heat conduction package package leads. Therefore, layouts having ground plane, wide traces pads, wide power supply lines combine lower and, therefore, increase maximum allowable power dissipation limit.
Where terms previously defined.
Equation
Equation used conjunction with Equation ensure regulator thermal operation within limits. example: GIVEN: VINMAX 3.0V VOUTMIN 2.7V 0.5% ILOADMAX 250mA TJMAX 125°C TAMAX 55°C 8-Pin MSOP Package
FIND: Actual power dissipation Maximum allowable dissipation. Actual power dissipation: (VINMAX VOUTMIN)ILOADMAX [(3.0 1.1) (2.7 .995)]250 10-3
TC1174-2
1/25/00
2001 Microchip Technology Inc.
DS21363A
300mA Adjustable CMOS with Shutdown VREF Bypass TC1174
TYPICAL CHARACTERISTICS
Line Regulation 0.012 0.010
LINE REGULATION Noise (µV//
Output Noise 10.0 2.00 RLOAD COUT
LOAD REGULATION
Load Regulation 1.80 1.60 1.40 1.20 1.00 0.80 0.60 0.40 0.20 100mA 50mA 300mA
0.008 0.006 0.004 0.002 0.000 -0.002 -0.004
0.01
0.01
1000
0.00
TEMPERATURE (°C) Supply Current 100.0
DROPOUT VOLTAGE SUPPLY CURRENT (µA)
FREQUENCY (KHz)
TEMPERATURE (°C) VOUT Temperature 3.075 ILOAD 100µA CLOAD 3.3µF 3.025
VOUT
Dropout Voltage Load Current 0.40 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0.00 -40°C 125°C 85°C 70°C 25°C
90.0 80.0 70.0 60.0 50.0 40.0
2.975
2.925
TEMPERATURE (°C)
LOAD CURRENT (mA)
TEMPERATURE (°C)
Power Supply Rejection Ratio VOUT -35dB LOAD -40dB VINAC 50mV -45dB
PSRR (dB)
-30dB
-50dB -55dB -60dB -65dB -70dB -75dB -80dB 100K
FREQUENCY (Hz)
COUT
2001 Microchip Technology Inc.
DS21363A
TC1174-2
1/25/00
300mA Adjustable CMOS with Shutdown VREF Bypass TC1174
TAPE REEL
Component Taping Orientation 8-Pin SOIC (Narrow) Devices
User Direction Feed
User Direction Feed
Standard Reel Component Orientation Suffix Device
Standard Reel Component Orientation Suffix Device
Carrier Tape, Number Components Reel Reel Size
Package Carrier Width Pitch Part Full Reel Reel Size
8-Pin SOIC
2500
Component Taping Orientation 8-Pin MSOP Devices
User Direction Feed
User Direction Feed
Standard Reel Component Orientation Suffix Device
Reverse Reel Component Orientation Suffix Device
Carrier Tape, Number Components Reel Reel Size
Package Carrier Width Pitch Part Full Reel Reel Size
8-Pin MSOP
2500
TC1174-2
1/25/00
2001 Microchip Technology Inc.
DS21363A
300mA Adjustable CMOS with Shutdown VREF Bypass TC1174
PACKAGE DIMENSIONS
8-Pin SOIC (Narrow)
.157 (3.99) .150 (3.81)
.244 (6.20) .228 (5.79)
.050 (1.27) TYP.
.197 (5.00) .189 (4.80) .069 (1.75) .053 (1.35) .020 (0.51) .010 (0.25) .013 (0.33) .004 (0.10) .010 (0.25) .007 (0.18) .050 (1.27) .016 (0.40)
MAX.
8-Pin MSOP
.122 (3.10) .114 (2.90)
.197 (5.00) .189 (4.80)
.026 (0.65) TYP.
.122 (3.10) .114 (2.90) .043 (1.10) MAX. .016 (0.40) .010 (0.25) .006 (0.15) .002 (0.05)
MAX. .028 (0.70) .016 (0.40)
.008 (0.20) .005 (0.13)
Dimensions: inches (mm)
2001 Microchip Technology Inc.
DS21363A
TC1174-2
1/25/00
300mA Adjustable CMOS with Shutdown VREF Bypass TC1174
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rights reserved. 2001 Microchip Technology Incorporated. Printed USA. 1/01
Information contained this publication regarding device applications like intended through suggestion only superseded updates. your responsibility ensure that your application meets with your specifications. representation warranty given liability assumed Microchip Technology Incorporated with respect accuracy such information, infringement patents other intellectual property rights arising from such otherwise. products critical components life support systems authorized except with express written approval Microchip. licenses conveyed, implicitly otherwise, except maybe explicitly expressed herein, under intellectual property rights. Microchip logo name registered trademarks Microchip Technology Inc. U.S.A. other countries. rights reserved. other trademarks mentioned herein property their respective companies.
TC1174-2
1/25/00
2001 Microchip Technology Inc.
DS21363A

Extremely Supply Current (50µA, Typ.) Very Dropout Voltage Guaranteed

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