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TC1265 800mA Fixed Output CMOS with Shutdown
Very Dropout Voltage Guaranteed 800mA Output High Output Voltage Accuracy Standard Custom Output Voltages Over-Current Over-Temperature Protection SHDN Input Active Power Management ERROR Output Detect Battery (SOIC Only)
TC1265 fixed output, high accuracy (typically ±0.5%) CMOS dropout regulator. Designed specifically battery-operated systems, TC1265's CMOS construction eliminates wasted ground current, significantly extending battery life. Total supply current typically 80µA full load times lower than bipolar regulators!). TC1265 features include ultra noise, very dropout voltage (typically 450mV full load), fast response step changes load. TC1265 incorporates both over-temperature over-current protection. TC1265 stable with output capacitor only maximum output current 800mA. available 8Pin SOIC, 5-Pin TO-220, 5-Pin DDPAK packages.
APPLICATIONS
Battery-Operated Systems Portable Computers Medical Instruments Instrumentation Cellular Phones Linear Post-Regulator SMPS Pagers
ORDERING INFORMATION
Part Number TC1265-xxVOA TC1265-xxVAT TC1265-xxVET Junction Temperature Range
TYPICAL APPLICATION
Package
VOUT SHDN
VOUT
8-Pin SOIC(Narrow) 40°C +125°C 5-Pin TO-220 40°C +125°C 5-Pin DDPAK 40°C +125°C
TC1265
SHDN
Available Output Voltages: 1.8, 2.5, 3.0, indicates ouput voltages
Other output voltages available. Please contact Microchip Technology Inc. details.
CONFIGURATION
5-Pin DDPAK
FRONT VIEW
TC1265
5-Pin TO-220
SHDN VOUT
8-Pin SOIC
TC1265 VOUT BYPASS SHDN ERROR
TC1265
2001 Microchip Technology Inc.
DS21376A
SHDN VOUT
TC1265-4 3/28/00
800mA Fixed Output CMOS with Shutdown TC1265
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.) +260°C
*Absolute Maximum Ratings indicate device operation limits beyond damage occur. Device operation beyond limits listed Electrical Characteristics recommended.
ELECTRICAL CHARACTERISTICS: 1.5V (Note 100µA, 3.3µF, SHDN VIH, 25°C, unless
otherwise specified. BOLDFACE type specifications apply junction temperatures 40°C +125°C.
Symbol
IOUTMAX VOUT VOUT/T VOUT/VIN VOUT/VOUT VOUT
Parameter
Input Operating Voltage Maximum Output Current Output Voltage VOUT Temperature Coefficient Line Regulation Load Regulation Dropout Voltage (Note
Test Conditions
Units
ppm/°C %/mA
ISHDN PSRR IOUTSC VOUT/PD SHDN Input
Supply Current Shutdown Supply Current Power Supply Rejection Ratio Output Short Circuit Current Thermal Regulation Output Noise SHDN Input High Threshold SHDN Input Threshold
(Note (SOIC-8 TBD) 2.5V 2.5% 0.5% 2.5% 1.8V 0.5% (Note 0.007 0.35 -0.01 0.002 0.1mA IOUTMAX (Note 2.5V, 100µA 100mA 300mA 500mA 800mA (SOIC TBD) 1300 1000 1.8V, 500mA 800mA (SOIC TBD) 1400 SHDN VIH, SHDN 0.05 1KHz VOUT 1200 1400 (Note 0.04 IOUTMAX, 10kHz
nV/Hz %VIN %VIN
ERROR Output (SOIC Only) VMIN VHYS Minimum Operating Voltage Output Logic Voltage ERROR Threshold Voltage ERROR Positive Hysteresis Flows ERROR (Note 0.95
NOTES: regulator output voltage setting. minimum justify conditions: VIN> VDROPOUT 2.7V 0.1mA IOUTMAX. 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 1.5V 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 thermal shutdown. Please Thermal Considerations section this data sheet more details. Hysteresis voltage referenced
TC1265-4
3/28/00
2001 Microchip Technology Inc.
DS21376A
800mA Fixed Output CMOS with Shutdown TC1265
DETAILED DESCRIPTION
TC1265 precision, fixed output LDO. Unlike bipolar regulators, TC1265 supply current does increase with load current. addition, VOUT remains stable within regulation very load currents important consideration CMOS battery backup applications). Figure shows typical application circuit.
BATTERY VOUT VOUT
timing capacitor C3). should chosen maintain ERROR below processor RESET input least msec allow time system stabilize. Pull-up resistor tied VOUT, other voltage less than (VIN 0.3V.)
VOUT
Hysteresis (VH)
TC1265
ERROR
SHDN Shutdown Control CMOS Logic unused)
ERROR BATTLOW RESET
Required Only ERROR used Processor RESET Signal (See Text)
Figure ERROR Output Operation
0.2µF
Thermal Considerations
Thermal Shutdown Integrated thermal protection circuitry shuts regulator when temperature exceeds 160°C. regulator remains until temperature drops approximately 150°C. 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: worst case actual power dissipation VINMAX maximum voltage VOUTMIN minimum regulator output voltage ILOADMAX maximum output (load) current
Equation
Figure Typical Application Circuit
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. ERROR Output ERROR driven whenever VOUT falls regulation more than (typical). This condition caused input voltage, output current limiting, thermal limiting. ERROR threshold below rated VOUT regardless programmed output voltage value (e.g., ERROR 4.75V (typ) 5.0V regulator 2.85V (typ) 3.0V regulator). ERROR output operation shown Figure Note that ERROR active when VOUT below VTH, inactive when VOUT above shown Figure ERROR used battery flag, processor RESET signal (with addition
2001 Microchip Technology Inc. DS21376A
maximum allowable power dissipation (Equation function maximum ambient temperature (TAMAX), maximum allowable temperature (125°C) thermal resistance from junction-to-air JA). PDMAX (TJMAX TAMAX)
Where terms previously defined.
Equation
TC1265-4 3/28/00
800mA Fixed Output CMOS with Shutdown TC1265
Table shows various values TC1265 mounted 1/16 inch, 2-layer with copper foil. Table Thermal Resistance Guidelines TC1265 8-Pin SOIC Package Copper Area (Topside)* 2500 1000 Copper Area (Backside) 2500 2500 2500 2500 Board Area 2500 2500 2500 2500 Thermal Resistance 60°C/W 60°C/W 68°C/W 74°C/W
Equation used conjunction with Equation ensure regulator thermal operation within limits. example: GIVEN: VINMAX VOUTMIN ILOADMAX TJMAX TAMAX
3.3V 2.7V 0.5% 275mA 125°C 95°C 60°C/W(SOIC)
FIND: Actual power dissipation Maximum allowable dissipation Actual power dissipation:
NOTES: *Pin ground. Device mounted topside.
Table Thermal Resistance Guidelines TC1265 5-Pin DDPAK/TO-220 Package Copper Area (Topside)* 2500 1000 Copper Area (Backside) 2500 2500 2500 Board Area 2500 2500 2500 Thermal Resistance 25°C/W 27°C/W 35°C/W
(VINMAX VOUTMIN)ILOADMAX [(3.3 1.1) (2.7 .995)]275 10-3 260mW Maximum allowable power dissipation: (TJMAX TAMAX) PDMAX
(125 500mW
NOTES: *Tab device attached topside copper
this example, TC1265 dissipates maximum only 260mW; below allowable limit similar manner, Equation Equation used calculate maximum current and/or input voltage limits. example, maximum allowable found substituting maximum allowable power dissipation into Equation from which VINMAX 4.6V.
TC1265-4
3/28/00
2001 Microchip Technology Inc.
DS21376A
800mA Fixed Output CMOS with Shutdown TC1265
TYPICAL CHARACTERISTICS
Line Regulation Temperature 0.020 0.018
LINE REGULATION
Output Noise Frequency 10.0 0.0100 RLOAD COUT
LOAD REGULATION %/mA
Load Regulation Temperature 0.0090 0.0080 0.0070 0.0060 0.0050 0.0040 0.0030 0.0020 0.0010 0.0100 -40°C 25°C 70°C 85°C 125°C VOUT 800mA
0.016 0.014 0.012 0.010 0.008 0.006 0.004 0.002 0.000 -40°C 25°C 70°C 85°C 125°C 0.01 0.01 1000
NOISE (µV//
TEMPERATURE (°C) Temperature
(µA) DROPOUT VOLTAGE
FREQUENCY (KHz)
TEMPERATURE (°C) 3.0V VOUT Temperature 3.030 3.020 3.010 3.000
VOUT
3.0V Dropout Voltage ILOAD 0.600 0.550 0.500 0.450 0.400 0.350 0.300 0.250 0.200 0.150 0.100 0.050 0.000 -40°C 85°C 70°C 25°C 125°C
ILOAD 0.1mA
2.990 2.980 2.970 2.960 2.950 2.940 2.930 2.920 -40°C
ILOAD 300mA ILOAD 500mA
-40°C 25°C 70°C
VOUT
ILOAD 800mA
85°C 125°C
ILOAD (mA) ISHDN Temperature
25°C
70°C
85°C 125°C
TEMPERATURE (°C) Power Supply Rejection Ratio -30dB -35dB VOUT RLOAD -40dB VINAC 50mVp-p -45dB
PSRR (dB) ISHDN (µA)
TEMPERATURE (°C)
0.090 0.080 0.070 0.060 0.050 0.040 0.030 0.020 0.010
-50dB -55dB -60dB -65dB -70dB -75dB -80dB 100K FREQUENCY (Hz) COUT
0.000 -40°C
25°C
70°C
85°C 125°C
TEMPERATURE (°C)
2001 Microchip Technology Inc.
DS21376A
TC1265-4 3/28/00
800mA Fixed Output CMOS with Shutdown TC1265
TAPING FORM
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 5-Pin DDPAK Devices
User Direction Feed
Device Marking Device Marking
Standard Reel Component Orientation Suffix Device (Mark Right Side Package Carrier Width
User Direction Feed
Reverse Reel Component Orientation Suffix Device (Mark Upside Down)
Carrier Tape, Number Components Reel Reel Size
Pitch Part Full Reel Reel Size
5-Pin DDPAK
TC1265-4
3/28/00
2001 Microchip Technology Inc.
DS21376A
800mA Fixed Output CMOS with Shutdown TC1265
PACKAGE DIMENSIONS
8-Pin SOIC
indicated beveled edge
.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) .013 (0.33) .010 (0.25) .004 (0.10) .010 (0.25) .007 (0.18) .050 (1.27) .016 (0.40)
8°MAX.
5-Pin DDPAK
.410 (10.41) .385 (9.78) .067 (1.70) .045 (1.14) (5x) .370 (9.40) .330 (8.38) .605 (15.37) .549 (13.95) .026 (0.66) .014 (0.36) .037 (0.94) .026 (0.66) .067 (1.70) TYP. MAX. .110 (2.79) .068 (1.72) .010 (0.25) .000 (0.00) .183 (4.65) .170 (4.32) .055 (1.40) .045 (1.14)
Dimensions: inches (mm)
2001 Microchip Technology Inc.
DS21376A
TC1265-4 3/28/00
800mA Fixed Output CMOS with Shutdown TC1265
PACKAGE DIMENSIONS (CONT.)
5-Pin TO-220
.185 (4.70) .165 (4.19) .117 (2.97) .103 (2.62) .415 (10.54) .390 (9.91) .156 (3.96) .140 (3.56) DIA. .055 (1.40) .045 (1.14)
.293 (7.44) .204 (5.18) .613 (15.57) .569 (14.45) 7.5° PLCS.
.590 (14.99) .482 (12.24)
.037 (0.95) .025 (0.64) .025 (0.64) .012 (0.30) .072 (1.83) .062 (1.57) .273 (6.93) .263 (6.68) .115 (2.92) .087 (2.21)
Dimensions: inches (mm)
TC1265-4
3/28/00
2001 Microchip Technology Inc.
DS21376A
800mA Fixed Output CMOS with Shutdown TC1265
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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.
2001 Microchip Technology Inc.
DS21376A
TC1265-4 3/28/00
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