LM108

FEATURES● Low Dropout Voltage 500mV at 3A Output Current● Fast Transient Response● 0.015% Line Regulation● 0.1% Load Regulation● Internal Thermal and Current Limiting● Adjustable or Fixed Output Voltage(1.5, 2.5, 2.85, 3.0, 3.3, 5.0V)● Surface Mount Package SOT-223 & TO-263 (D2 Package)● 100% Thermal Limit Burn-in TO-220 PKGLM1085

APPLICATIONS● Battery Charger● Adjustable Power Supplies● Constant Current Regulators● Portable Instrumentation● High Efficiency Linear Power Supplies● High Efficiency \"Green\" Computer Systems● SMPS Post-Regulator● Power PC Supplies● Powering VGA & Sound Card

TO-263 PKG 1. Adj/Gnd 2. Output 3. InputORDERING INFORMATION

Device & MarkingLM1085T-X.XLM1085R-X.X

PackageTO-220TO263 (D2)

DESCRIPTION

(XX=Vout=1.5V, 2.5V, 2.85V, 3.0V, 3.3V, 5.0V

Adjustable= AD)

The LM1085 is a low dropout three terminal regulator with 3A output current capability.

The output voltage is adjustable with the use of a resistor divider. Dropout is guaranteed at a maximumof 500 mV at maximum output current.

It's low dropout voltage and fast transient response make it ideal for low voltage microprocessor applications. Internal current and thermal limiting provides protection against any overload conditionthat would create excessive junction temperature.

TEST & TYPICAL APPLICATION CIRCUIT

2VIN5V+C110㎌3LM10851ADJVREFRF1124Ω1%VOUT3.33VVREF=VOUT-VADJ=1.25V(Typ.)VOUT=VREFx(1+RF2/RF1)+IADJxRF2IADJ=55㎂(Typ.)C210㎌(1) C1 Needed if device is far away from filter capacitors.(2) C2 Required for stabilityRF2205Ω1%Adjustable Voltage RegulatorMar. 2006 - Rev 06

84

HTC3A L.D.O. VOLTAGE REGULATOR (Adjustable & Fixed)

ABSOULTE MAXIMUM RATINS

CHARACTERISTICSupply Voltage

Operating Junction Temperature RangeStorage Temperature Range

Thermal Resistance Junction to Case TO-263Thermal Resistance Junction to Ambient TO-263Lead Temperature (Soldering) 10 sec.Maximum Output Current

SYMBOLVinToprTstgTjcTjaTsolImax

VALUE70~125-65~150

3603003

LM1085

UNITV℃℃C/WC/W℃A

ELECTRICAL CHARACTERISTICS I

PARAMETER

1.5V Version Output Voltage 2.5V Version Output Voltage 2.85V Version Output Voltage 3.0V Version Output Voltage 3.3V Version Output Voltage 5.0V Version Output Voltage All Voltage Options Reference Voltage (VREF) Min. Load Current(Note 3) Line Regulation (ΔVREF(VIN)) Load Regulation (ΔVREF(VOUT)) Dropout Voltage Current Limit IOUT(MAX) Long Term Stability Thermal Regulation (ΔVOUT(Pwr)) Output Noise, RMS Thermal Resistance

OUT=100㎃, TA=25℃, unless otherwise specified

TEST CONDITIONSMINTYPMAXUNIT

000000≤IOUT≤3A, 5.5V≤VIN<10V4.9555.05V

VIN≤7V,P≤PMAX

VOUT)≤5.75V, 10㎃≤IOUT≤3A 1.5V≤(VIN- 1.5V≤(VIN-VOUT)≤5.75V

2.75V≤VIN≤7V, IOUT=10㎃, TJ=25℃ 10㎃≤IOUT≤3A,(VIN-VOUT)=3V,TJ=25℃ ΔVREF=1% , Iout=3A Vin-Vout=3V

1.4V≤(VIN-VOUT) Adjustable Only TA=125℃, 1000Hrs TA=25℃, 30㎳ pulse 10Hz to 10Khz TA=25℃ Junction to Tab Junction to Ambient

1.2381.225

1.251.2550.0050.051.1

1.2631.27100.20.31.2

VmA%%VA

3.24.00.30.01

10.02

%%/W%/Vo

0.003

360

℃/W

Mar. 2006 - Rev 06

85

HTC