Very Dropout Voltage Guaranteed 500mA Output High Output Voltage Accur
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TC1268 500mA Fixed Output, Fast Response CMOS with Shutdown
Very Dropout Voltage Guaranteed 500mA Output High Output Voltage Accuracy Standard Custom Output Voltages Over-Current Over-Temperature Protection SHDN Input Active Power Management ERROR Output Detect Battery 5µsec (typ.) Wake Time from SHDN
TC1268 fixed output, fast turn-on, high accuracy (typically ±0.5%) CMOS dropout regulator. Designed specifically battery-operated systems, TC1268's CMOS construction eliminates wasted ground current, significantly extending battery life. Total supply current typically 80µA full load times lower than bipolar regulators!). TC1268's features include ultra noise, very dropout voltage (typically 350mV full load), fast response step changes load. TC1268 also fast wake response time µsec typically) when released from shutdown. TC1268 incorporates both over-temperature over-current protection. TC1268 stable with output capacitor only maximum output current 500mA.
APPLICATIONS
RAMBUS Memory Module Battery-Operated Systems Portable Computers Medical Instruments Instrumentation Cellular Phones Linear Post-Regulator SMPS Pagers Digital Cameras
ORDERING INFORMATION
Part Number TC1268-2.5VOA Output* Voltage Package Junction Temperature Range
TYPICAL APPLICATION
8-Pin SOIC 40°C +125°C
VOUT
VOUT COUT SHDN
*Other output voltages package options available. Please contact Microchip Technology Inc. details.
TC1268
SHDN
CONFIGURATION
8-Pin SOIC
VOUT BYPASS SHDN ERROR
TC1268
2001 Microchip Technology Inc.
DS21379A
TC1268-1 2/9/00
500mA Fixed Output, Fast Response CMOS with Shutdown TC1268
ABSOLUTE MAXIMUM RATINGS*
Input Voltage 6.5V 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:
Symbol
IOUTMAX VOUT VOUT/T VOUT/VIN VOUT/VOUT VOUT
VOUT 100µA, 3.3µF, SHDN VIH, 25°C, unless otherwise specified. BOLDFACE type specifications apply junction temperatures 40°C +125°C.
Parameter
Input Operating Voltage Maximum Output Current Output Voltage VOUT Temperature Coefficient Line Regulation Load Regulation Dropout Voltage (Note
Test Conditions
(SOIC-8 TBD) Note Note 0.1mA IOUTMAX (Note 100µA 100mA 300mA 500mA SHDN VIH, SHDN 3.5V, VOUT 2.5V COUT 250mA, (See Fig. 3.5V, VOUT 2.5V COUT 250mA, (See Fig. 1kHz VOUT Note IOUTMAX
Units
ppm/°C %/mA
ISHDN
Supply Current (Active Mode) Supply Current (Shutdown Mode) Wake Time (from Shutdown Mode) Settling Time (from Shutdown Mode) Power Supply Rejection Ratio Output Short Circuit Current Thermal Regulation Output Noise SHDN Input High Threshold SHDN Input Threshold
0.5% 2.5% 2.5% 0.05 0.35 0.002 0.01
µsec µsec
PSRR IOUTSC VOUT/PD SHDN Input
1200 0.04
1400
nV/Hz %VIN %VIN
ERROR Output VMIN VHYS Minimum Operating Voltage Output Logic Voltage ERROR Threshold Voltage ERROR Positive Hysteresis Flows ERROR Note 0.95
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. qJA). Exceeding maximum allowable power dissipation causes device initiate thermal shutdown. Please Thermal Considerations section this data sheet more details. Hysteresis voltage referenced
TC1268-1 2/9/00
2001 Microchip Technology Inc.
DS21379A
500mA Fixed Output, Fast Response CMOS with Shutdown TC1268
DETAILED DESCRIPTION
TC1268 precision, fixed output LDO. Unlike bipolar regulators, TC1268 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.
VOUT VOUT COUT
switching regulator during normal power conditions switched power mode, where TC1268 takes over supplies same 2.5V much lower current (300mA). order voltage droop during transition from high power power, TC1268 very fast wake time 5µsec support 2.5V rail. This makes TC1268 ideal applications involving RAMBUS. Bypass Input 10nF 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, this results longer time period achieve rated output voltage once power initially applied. 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. 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 2.375V (typ.) 2.5V 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 timing capacitor C1). 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.)
Battery
TC1268
SHDN SHDN
CBYP 10nF ERROR required only ERROR used processor RESET signal (See Text) 0.2µF
Figure Typical Application Circuit
Turn Response turn response defined separate response categories, Wake Time (TWK) Settling Time (TS). TC1268 fast Wake Time (5µsec typical) when released from shutdown. Figure Wake Time designated TWK. Wake Time defined time takes output rise VOUT value after being released from shutdown. total turn response defined Settling Time (TS), Figure Settling Time (inclusive with TWK) defined condition when output within fully enabled value (15µsec typical) when released from shutdown. settling time output voltage dependent load conditions output capacitance VOUT response). Wake Time (TWK important parameter consider when using TC1268 RAMBUS applications. this application, voltage held 2.5V
SHDN VOUT
Figure Wake Response Time
2001 Microchip Technology Inc. DS21379A
1268-1 2/9/00
500mA Fixed Output, Fast Response CMOS with Shutdown TC1268
VOUT
Table Thermal Resistance Guidelines TC1268 8-Pin SOIC Package
Hysteresis (VH)
Copper Area (Topside)* 2500 1000
Copper Area (Backside) 2500 2500 2500 2500
Thermal Resistance Board Area 2500 2500 2500 2500 60°C/W 60°C/W 68°C/W 74°C/W
ERROR
Figure ERROR Output Operation
NOTES: *Pin ground. Device mounted topside.
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 used conjunction with Equation ensure regulator thermal operation within limits. example: GIVEN: VINMAX VOUTMIN ILOAD TAMAX
3.3V 2.5V 0.5% 275mA 95°C 59°C/W
FIND: Actual power dissipation Maximum allowable dissipation Actual power dissipation: (VINMAX VOUTMIN)ILOADMAX [(3.3 1.1) (2.5 .995)]275 10-3 314mW Maximum allowable power dissipation: (TJMAX TAMAX) PDMAX
Equation
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)
(125 508mW
Where terms previously defined.
Equation
this example, TC1268 dissipates maximum only 314mW; 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 3.94V.
Table shows various values TC1268 mounted 1/16 inch, 2-layer with copper foil.
TC1268-1 2/9/00
2001 Microchip Technology Inc.
DS21379A
500mA Fixed Output, Fast Response CMOS with Shutdown TC1268
TYPICAL CHARACTERISTICS
Fast Response TC1268 Fast Response TC1268
SHDN
Conditions: VOUT 2.50V 3.50V COUT RLOAD
SHDN
Conditions: VOUT 2.50V 3.50V COUT RLOAD
VOUT
VOUT
100µsec/DIV; 15µsec Rise Time
10µsec/DIV; 15µsec Rise Time
2001 Microchip Technology Inc.
DS21379A
1268-1 2/9/00
500mA Fixed Output, Fast Response CMOS with Shutdown TC1268
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
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.
Dimensions: inches (mm)
TC1268-1 2/9/00
2001 Microchip Technology Inc.
DS21379A
500mA Fixed Output, Fast Response CMOS with Shutdown TC1268
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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.
DS21379A
1268-1 2/9/00
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