Very Dropout Voltage Guaranteed 500mA Output High Output Voltage Accur
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TC1262 500mA Fixed Output CMOS
Very Dropout Voltage Guaranteed 500mA Output High Output Voltage Accuracy Standard Custom Output Voltages Over-Current Over-Temperature Protection
TC1262 fixed output, high accuracy (typically ±0.5%) CMOS dropout regulator. Designed specifically battery-operated systems, TC1262's CMOS construction eliminates wasted ground current, significantly extending battery life. Total supply current typically full load times lower than bipolar regulators). TC1262 features include ultra noise, very dropout voltage (typically 350mV full load), fast response step changes load. TC1262 incorporates both over-temperature over-current protection. TC1262 stable with output capacitor only maximum output current 500mA. available 3Pin SOT-223, 3-Pin TO-220, 3-Pin DDPAK packages.
APPLICATIONS
Battery-Operated Systems Portable Computers Medical Instruments Instrumentation Cellular Phones Linear Post-Regulator SMPS Pagers
TYPICAL APPLICATION
ORDERING INFORMATION
Part Number TC1262-xxVDB TC1262-xxVAB TC1262-xxVEB Package Junction Temp. Range
VOUT
VOUT
TC1262
3-Pin SOT-223 40°C +125°C 3-Pin TO-220 40°C +125°C 3-Pin DDPAK 40°C +125°C
CONFIGURATION
3-Pin TO-220
Available Output Voltages: 2.5, 2.8, 3.0, 3.3, indicates output voltages
3-Pin DDPAK
FRONT VIEW
Other output voltages available. Please contact Microchip Technology Inc. details.
TC1262
TC1262
VOUT
FRONT VIEW
VOUT
TC1262
2001 Microchip Technology Inc. DS21373A TC1262-2 12/01/00
VOUT
3-Pin SOT-223
500mA Fixed Output CMOS
TC1262
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:
VOUT 100µA, 3.3µF, 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
Note Note 0.1mA IOUTMAX (Note 100µA 100mA 300mA 500mA 1KHz VOUT Note IOUTMAX
PSRR IOUTSC VOUT/PD
Supply Current Power Supply Rejection Ratio Output Short Circuit Current Thermal Regulation Output Noise
0.5% 2.5% 2.5% .003 0.35 0.002 0.01 1200 0.04
nV/Hz
NOTES: regulator output voltage setting. 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 msec. 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.
TC1262-2
12/01/00
2001 Microchip Technology Inc.
DS21373A
500mA Fixed Output CMOS
TC1262
DETAILED DESCRIPTION
TC1262 precision, fixed output LDO. Unlike bipolar regulators, TC1262 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. Where: (VINMAX VOUTMIN)ILOADMAX worst case actual power dissipation VINMAX maximum voltage VOUTMIN minimum regulator output voltage ILOADMAX maximum output (load) current
Equation
Battery VOUT VOUT
TC1262
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.
Figure Typical Application Circuit Equation
Output Capacitor (min) capacitor from VOUT ground required. output capacitor should have effective series resistance less, resonant frequency above MHz. 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.
Table shows various values TC1262 mounted 1/16 inch, 2-layer with copper foil. Table Thermal Resistance Guidelines TC1262 SOT-223 Package Copper Area (Topside)* 2500 1000 1000 1000 Copper Area (Backside) 2500 2500 2500 2500 1000 Board Area 2500 2500 2500 2500 1000 1000 Thermal Resistance 45°C/W 45°C/W 53°C/W 59°C/W 52°C/W 55°C/W
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:
NOTES: *Tab device attached topside copper
Table Thermal Resistance Guidelines TC1262 3-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
NOTES: *Tab device attached topside copper
Equation used conjunction with Equation ensure regulator thermal operation within limits. example:
TC1262-2 12/01/00
2001 Microchip Technology Inc.
DS21373A
500mA Fixed Output CMOS
TC1262
GIVEN: VINMAX VOUTMIN ILOAD TAMAX
3.3V 2.7V 0.5% 275mA 95°C 59°C/W (SOT-223)
FIND: Actual power dissipation Maximum allowable dissipation Actual power dissipation: (VINMAX VOUTMIN)ILOADMAX [(3.3 1.1) (2.7 .995)]275 10-3 260mW Maximum allowable power dissipation: (TJMAX TAMAX) PDMAX
(125 508mW
this example, TC1262 dissipates maximum only 260mW; below allowable limit 508mW. similar manner, Equation Equation used calculate maximum current and/or input voltage limits. example, maximum allowable found substituting maximum allowable power dissipation 508mW into Equation from which VINMAX 4.6V.
TC1262-2
12/01/00
2001 Microchip Technology Inc.
DS21373A
500mA Fixed Output CMOS
TC1262
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 2.5V 500mA
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 TEMPERATURE (°C) Temperature
DROPOUT VOLTAGE NOISE (µV//
500mA
FREQUENCY (KHz)
TEMPERATURE (°C) 5.0V Dropout Voltage ILOAD 0.50 125°C
2.5V Dropout Voltage ILOAD 0.50 125°C
DROPOUT VOLTAGE
(µA)
0.40 25°C
85°C 70°C
0.40 85°C 0.30 70°C 25°C 0.20 0.10 -40°C
-40°C
2.5V
0.30
0.20 -40°C 0.10
0.00 25°C 70°C 85°C 125°C TEMPERATURE (°C) 2.5V VOUT Temperature ILOAD (mA) 5.0V VOUT Temperature 5.20 5.10 5.00 4.90 4.80 4.70 4.60 4.50 4.40 4.30 4.20 4.10 4.00 -40°C
0.00 ILOAD (mA) Power Supply Rejection Ratio -30dB 0.1mA -35dB VOUT RLOAD -40dB VINAC 50mVp-p -45dB 300mA 500mA
PSRR (dB)
2.70 2.50 2.30
VOUT VOUT
0.1mA
2.10 1.90 1.70
300mA 500mA
-50dB -55dB -60dB -65dB -70dB -75dB COUT
1.50 -40°C
25°C
70°C
85°C
125°C
25°C
70°C
85°C
125°C
-80dB 100K
FREQUENCY (KHz)
TEMPERATURE (°C)
TEMPERATURE (°C)
2001 Microchip Technology Inc.
DS21373A
TC1262-2
12/01/00
500mA Fixed Output CMOS
TC1262
TAPING FORMS
Component Taping Orientation 3-Pin SOT-223 Devices
User Direction Feed
Device Marking Device Marking
User Direction Feed
Standard Reel Component Orientation Suffix Device (Mark Right Side
Reverse Reel Component Orientation Suffix Device (Mark Upside Down)
Carrier Tape, Number Components Reel Reel Size
Package Carrier Width Pitch Part Full Reel Reel Size
3-Pin SOT-223
4000
PACKAGE DIMENSIONS
3-Pin SOT-223
.264 (6.70) .248 (6.30)
.122 (3.10) .114 (2.90)
.287 (7.30) .146 (3.70) .264 (6.70) .130 (3.30)
.091 (2.30) TYP. .033 (0.84) .024 (0.60) .071 (1.80) MAX. .004 (0.10) .001 (0.02) .181 (4.60) TYP.
.041 (1.04) .033 (0.84)
MAX. .036 (0.91) MIN.
.013 (0.33) .009 (0.24)
Dimensions: inches (mm)
TC1262-2
12/01/00
2001 Microchip Technology Inc.
DS21373A
500mA Fixed Output CMOS
TC1262
PACKAGE DIMENSIONS
3-Pin DDPAK
.410 (10.41) .385 (9.78) .067 (1.70) .045 (1.14) (5x) .010 (0.25) .000 (0.00) .051 (1.30) .049 (1.24) .037 (0.94) .026 (0.66) .100 (2.54) TYP. MAX. .026 (0.66) .014 (0.36) .110 (2.79) .068 (1.72) .183 (4.65) .170 (4.32)
.055 (1.40) .045 (1.14)
.370 (9.40) .330 (8.38) .605 (15.37) .549 (13.95)
3-Pin TO-220
.185 (4.70) .165 (4.19) .113 (2.87) .103 (2.62) .410 (10.41) .357 (9.06) .156 (3.96) .146 (3.71) DIA.
.055 (1.40) .045 (1.14)
.258 (6.55) .230 (5.84) .594 (15.09) .569 (14.45) 7.5° PLCS.
.244 (6.20) .234 (5.94) .560 (14.22) .518 (13.16) .055 (1.40) .045 (1.14) .037 (0.94) .027 (0.69) .105 (2.67) .095 (2.41) .205 (5.21) .195 (4.95)
.020 (0.51) .012 (0.30)
.115 (2.92) .095 (2.41)
Dimensions: inches (mm)
2001 Microchip Technology Inc.
DS21373A
TC1262-2
12/01/00
500mA Fixed Output CMOS
TC1262
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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.
TC1262-2
12/01/00
2001 Microchip Technology Inc.
DS21373A
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