Datasheet

ManualsBrandsLINEAR TECHNOLOGY ManualsVoltage RegulatorsLT1086CM#PBF

LT1086 Series

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3-Terminal Adjustable or Fixed

2.85V, 3.3V, 3.6V, 5V, 12V

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Output Current of 1.5A, (0.5A for LT1086H)

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Operates Down to 1V Dropout

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Guaranteed Dropout Voltage at Multiple Current Levels

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Line Regulation: 0.015%

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Load Regulation: 0.1%

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100% Thermal Limit Functional Test

The LT

1086 is designed to provide 1.5A with higher

efficiency than currently available devices. All internal

circuitry is designed to operate down to 1V input-to-

output differential and the dropout voltage is fully speci-

fied as a function of load current. Dropout is guaranteed at

a maximum of 1.5V at maximum output current, decreas-

ing at lower load currents. On-chip trimming adjusts the

reference/ouput voltage to 1%. Current limit is also

trimmed, minimizing the stress on both the regulator and

power source circuitry under overload conditions.

The LT1086 is pin compatible with older 3-terminal adjust-

able regulators. A 10µF output capacitor is required on

these new devices; however, this is usually included in

most regulator designs.

A 2.85V output version is offered for SCSI-2 active termi-

nation. For surface mount applications see the LT1117-

2.85 data sheet. For high current or lower dropout require-

ments see the LT1123-2.85 data sheet.

Unlike PNP regulators, where up to 10% of the output

current is wasted as quiescent current, the LT1086 quies-

cent current flows into the load, increasing efficiency.

1.5A Low Dropout Positive

Regulators Adjustable and

Fixed 2.85V, 3.3V, 3.6V, 5V, 12V

FEATURES

DESCRIPTION

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SCSI-2 Active Terminator

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High Efficiency Linear Regulators

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Post Regulators for Switching Supplies

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Constant Current Regulators

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Battery Chargers

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Microprocessor Supply

APPLICATIONS

LT1086 Dropout Voltage

OUTPUT CURRENT (A)

MINIMUM INPUT/OUTPUT DIFFERENTIAL (V)

0.5

LT1086 • TA02

1.5

INDICATES GUARANTEED TEST POINT

–55°C ≤ T

≤ 150°C

0°C ≤ T

≤ 125°C



= –55°C

= 25°C

= 150°C

TYPICAL APPLICATION

≥ 4.75V 3.3V AT 1.5A

*MAY BE OMITTED IF INPUT SUPPLY IS WELL

BYPASSED WITHIN 2" OF THE LT1086

LT1086-3.3

LT1086 • TA01

10µF*

TANTALUM

10µF

TANTALUM

IN OUT

GND

5V to 3.3V Regulator

, LTC and LT are registered trademarks of Linear Technology Corporation.

Summary of content (17 pages)

PAGE 1
LT1086 Series 1.5A Low Dropout Positive Regulators Adjustable and Fixed 2.85V, 3.3V, 3.6V, 5V, 12V U DESCRIPTION FEATURES ■ ■ ■ ■ ■ ■ ■ 3-Terminal Adjustable or Fixed 2.85V, 3.3V, 3.6V, 5V, 12V Output Current of 1.5A, (0.5A for LT1086H) Operates Down to 1V Dropout Guaranteed Dropout Voltage at Multiple Current Levels Line Regulation: 0.015% Load Regulation: 0.1% 100% Thermal Limit Functional Test U APPLICATIONS ■ ■ ■ ■ ■ ■ The LT ®1086 is designed to provide 1.
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LT1086 Series U W W W ABSOLUTE MAXIMUM RATINGS “M” Grades Control Section .......................... – 55°C to 150°C Power Transistor ........................ – 55°C to 200°C Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C Note 1: Although the device’s maximum operating voltage is limited, (18V for a 2.
PAGE 3
LT1086 Series ELECTRICAL CHARACTERISTICS PARAMETER CONDITIONS Reference Voltage (Note 2) LT1086, LT1086H Output Voltage (Note 2) LT1086-2.85 LT1086-3.3 LT1086-3.6 LT1086-5 LT1086-12 Line Regulation LT1086, LT1086H LT1086-2.85 LT1086-3.3 LT1086-3.6 LT1086-5 LT1086-12 Load Regulation LT1086, LT1086H LT1086-2.85 LT1086-3.3 LT1086-3.6 MIN TYP MAX UNITS ● 1.238 1.225 1.250 1.250 1.262 1.270 V V IOUT = 0mA, TJ = 25°C, VIN = 5V 0V ≤ IOUT ≤ 1.5A, 4.35V ≤ VIN ≤ 18V ● 2.82 2.79 2.85 2.85 2.
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LT1086 Series ELECTRICAL CHARACTERISTICS PARAMETER CONDITIONS MIN TYP Current Limit LT1086/-2.85/-3.3/-3.6/-5/-12 (VIN – VOUT) = 5V (VIN – VOUT) = 25V ● ● 1.50 0.05 2.00 0.15 A A LT1086H (VIN – VOUT) = 5V (VIN – VOUT) = 25V ● ● 0.50 0.02 0.700 0.075 A A Minimum Load Current LT1086/LT1086H (VIN – VOUT) = 25V (Note 4) ● 5 10 mA Quiescient Current LT1086-2.85 LT1086-3.3 LT1086-3.
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LT1086 Series U W TYPICAL PERFORMANCE CHARACTERISTICS LT1086 Short-Circuit Current Minimum Operating Current (Adjustable Device) LT1086 Load Regulation 2.5 10 0.10 TJ = 25°C TJ = –55°C 1.5 1.0 0.5 GUARANTEED OUTPUT CURRENT 0 0 25 10 15 20 5 INPUT/OUTPUT DIFFERENTIAL (V) 30 MINIMUM OPERATING CURRENT (mA) TJ = 150°C 2.0 OUTPUT VOLTAGE DEVIATION (%) SHORT-CIRCUIT CURRENT (A) ∆I = 1.5A 0.05 0 –0.05 –0.10 –0.15 –0.
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LT1086 Series U W TYPICAL PERFORMANCE CHARACTERISTICS LT1086-5 Ripple Rejection vs Current 80 100 90 90 fR = 20kHz VRIPPLE ≤ 0.5VP-P 50 40 30 VOUT = 5V CADJ = 25µF COUT = 25µF 10 60 (VIN – VOUT) ≥ 3V 50 40 (VIN – VOUT) ≥ VDROPOUT 30 20 0.25 1.25 0.75 1.0 0.5 OUTPUT CURRENT (A) 100 10 1.5 1k 10k FREQUENCY (Hz) 0.2 INPUT VOLTAGE DEVIATION (V) OUTPUT VOLTAGE DEVIATION (V) 40 CADJ = 1µF 0 –20 CADJ = 0 –40 VOUT = 10V IOUT = 0.
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LT1086 Series U W TYPICAL PERFORMANCE CHARACTERISTICS LT1086H Maximum Power Dissipation* LT1086H Ripple Rejection 100 5 VRIPPLE ≤ 3VP-P VRIPPLE ≤ 0.5VP-P 90 (VIN – VOUT) ≥ 3V 70 4 (VIN – VOUT) ≥ VDROPOUT 60 POWER (W) RIPPLE REJECTION (dB) 80 50 40 3 LT1086MH 2 30 CADJ = 200µF AT FREQUENCIES < 60Hz CADJ = 25µF AT FREQUENCIES > 60Hz IOUT = 0.
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LT1086 Series U W U U APPLICATIONS INFORMATION The LT1086 family of 3-terminal regulators is easy to use and has all the protection features that are expected in high performance voltage regulators. They are short-circuit protected, have safe area protection as well as thermal shutdown to turn off the regulator should the temperature exceed about 165°C at the sense point.
PAGE 9
LT1086 Series U W U U APPLICATIONS INFORMATION plugging and unplugging in the system will not generate current large enough to do any damage. the power supply may need to be cycled down to zero and brought up again to make the output recover. The adjustment pin can be driven on a transient basis ±25V, with respect to the output without any device degradation.
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LT1086 Series U U W U APPLICATIONS INFORMATION Load Regulation Thermal Considerations Because the LT1086 is a 3-terminal device, it is not possible to provide true remote load sensing. Load regulation will be limited by the resistance of the wire connecting the regulator to the load. The data sheet specification for load regulation is measured at the bottom of the package.
PAGE 11
LT1086 Series U U W U APPLICATIONS INFORMATION In both cases the junction temperature is below the maximum rating for the respective sections, ensuring reliable operation. Junction-to-case thermal resistance for the K and T packages is specified from the IC junction to the bottom of the case directly below the die. This is the lowest resistance path for heat flow.
PAGE 12
LT1086 Series U TYPICAL APPLICATIONS 5V Regulator with Shutdown 1.2V to 15V Adjustable Regulator VIN IN LT1086 VOUT† OUT R1 121Ω ADJ + C1* 10µF + R2 5k LT1086 IN VIN 5V OUT 121Ω 1% ADJ + + 10µF C2 100µF 100µF 1k 365Ω 1% 2N3904 TTL 1k *NEEDED IF DEVICE IS FAR FROM FILTER CAPACITORS † VOUT = 1.25V 1 + R2 R1 ( ) LT1086 • TA05 LT1086 • TA04 Battery Charger LT1086 ( ( VOUT – 1.25 1 + R2 R1 ( – RS 1 + R2 R1 ) dIF = dVOUT ) VIN > 12V VOUT 1.
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LT1086 Series U TYPICAL APPLICATIONS High Efficiency Dual Linear Supply L1 285µH IN MBR360 10k 1k + HEAT SINK 2N6667 Q1 DARLINGTON LT1086 1000µF ADJ LT1004-2.5 30k + MDA201 8 4700µF – + 20k* 2 + 7 124Ω* 2.4k 510k + 12V 1.5A OUT 100µF 30.1k* D1 1N4002 1.07k* LT1011 – 3 4 L1 285µH STANCOR P-8685 IN HEAT SINK 2N6667 Q2 DARLINGTON 10k 1k LT1004-2.5 30k 8 4700µF – + 20k* 2 + 7 124Ω* 2.
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LT1086 Series U TYPICAL APPLICATIONS Improving Ripple Rejection Battery Backed Up Regulated Supply VIN IN + 5.2V LINE 5V BATTERY LT1086-5 OUT VIN ≥ 6.5V GND 10µF LT1086 IN OUT ADJ + 10µF 50Ω 150µF R2 365Ω 1% SELECT FOR CHARGE RATE IN + 6.5V LT1086-5 OUT + C1 10µF* LT1086 • TA14 + GND 10µF VOUT = 5V R1 121Ω 1% *C1 IMPROVES RIPPLE REJECTION.
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LT1086 Series U PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted. K Package 2-Lead TO-3 Metal Can (LTC DWG # 05-08-1310) 1.177 – 1.197 (29.90 – 30.40) 0.655 – 0.675 (16.64 – 17.15) 0.320 – 0.350 (8.13 – 8.89) 0.760 – 0.775 (19.30 – 19.69) 0.210 – 0.220 (5.33 – 5.59) 0.151 – 0.161 (3.86 – 4.09) DIA, 2PLCS 0.060 – 0.135 (1.524 – 3.429) 0.167 – 0.177 (4.24 – 4.49) R 0.425 – 0.435 (10.80 – 11.05) 0.420 – 0.480 (10.67 – 12.19) 0.067 – 0.077 (1.70 – 1.96) 0.495 – 0.
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LT1086 Series U PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted. T Package 3-Lead Plastic TO-220 (LTC DWG # 05-08-1420) 0.147 – 0.155 (3.734 – 3.937) DIA 0.390 – 0.415 (9.906 – 10.541) 0.165 – 0.180 (4.191 – 4.572) 0.045 – 0.055 (1.143 – 1.397) 0.230 – 0.270 (5.842 – 6.858) 0.460 – 0.500 (11.684 – 12.700) 0.570 – 0.620 (14.478 – 15.748) 0.330 – 0.370 (8.382 – 9.398) 0.980 – 1.070 (24.892 – 27.178) 0.520 – 0.570 (13.208 – 14.478) 0.090 – 0.110 (2.286 – 2.794) 0.
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