Datasheet

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LT1086 Series

sn1086 1086ffs

APPLICATIO S

FEATURES

DESCRIPTIO

TYPICAL APPLICATIO

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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

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Ripple Rejection >75dB

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Available in 3-Pin TO-220 and 3-Pin DD Packages

The LT

1086 is designed to provide up to 1.5A output

current. All internal circuitry is designed to operate down

to 1V input-to-output differential and the dropout voltage

is fully specified as a function of load current. Dropout is

guaranteed at several operating points up to a maximum

of 1.5V at maximum output current. Dropout decreases at

lower load currents. On-chip trimming adjusts the refer-

ence/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 minimum 10µF output capacitor is

required on these devices.

The LT1086 offers excellent line and load regulation speci-

fications and ripple rejection exceeds 75dB even at the

maximum load current of 1.5A. The LT1086 is floating

architecture with a composite NPN output stage. All of the

quiescent current and the drive current for the output

stage flows to the load increasing efficiency.

The LT1086 is available in a 3-pin TO-220 package and a

space-saving surface mountable 3-pin DD package.

1.5A Low Dropout Positive

Regulators Adjustable and

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

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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

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

≥ 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 (16 pages)

PAGE 1
LT1086 Series 1.5A Low Dropout Positive Regulators Adjustable and Fixed 2.85V, 3.3V, 3.6V, 5V, 12V U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO 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.
PAGE 2
LT1086 Series W W U W ABSOLUTE MAXIMUM RATINGS (Note 1) “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 * Although the device’s maximum operating voltage is limited, (18V for a 2.
PAGE 3
LT1086 Series ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. PARAMETER CONDITIONS Reference Voltage (Note 3) LT1086, LT1086H Output Voltage (Note 3) 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.
PAGE 4
LT1086 Series ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. PARAMETER CONDITIONS Current Limit LT1086/-2.85/-3.3/-3.6/-5/-12 (VIN – VOUT) = 5V (VIN – VOUT) = 25V LT1086H Minimum Load Current Quiescient Current Thermal Regulation TA = 25°C, 30ms pulse Ripple Rejection f = 120Hz, COUT = 25µF Tantalum, IOUT = 1.5A, (IOUT = 0.
PAGE 5
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 = 150°C 2.0 TJ = 25°C TJ = –55°C 1.5 1.0 0.5 0 GUARANTEED OUTPUT CURRENT 0 25 10 15 20 5 INPUT/OUTPUT DIFFERENTIAL (V) 30 MINIMUM OPERATING CURRENT (mA) OUTPUT VOLTAGE DEVIATION (%) SHORT-CIRCUIT CURRENT (A) ∆I = 1.5A 0.05 0 –0.05 –0.10 –0.15 –0.
PAGE 6
LT1086 Series U W TYPICAL PERFORMANCE CHARACTERISTICS LT1086-5 Ripple Rejection vs Current 100 80 90 fR = 20kHz VRIPPLE ≤ 0.5VP-P 50 40 30 VOUT = 5V CADJ = 25µF COUT = 25µF 20 10 90 80 60 (VIN – VOUT) ≥ 3V 50 40 (VIN – VOUT) ≥ VDROPOUT 30 20 1.25 0.75 1.0 0.5 OUTPUT CURRENT (A) 1.5 100 10 1k 10k FREQUENCY (Hz) LT1086 Line Transient Response 0 –20 CADJ = 0 VOUT = 10V IOUT = 0.2A CIN = 1µF TANTALUM COUT = 10µF TANTALUM 12 100 TIME (µs) 0 200 0.2 CADJ = 0 0.1 0 –0.1 CADJ = 1µF –0.
PAGE 7
LT1086 Series U W TYPICAL PERFORMANCE CHARACTERISTICS LT1086H Maximum Power Dissipation* LT1086H Ripple Rejection 5 100 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.
PAGE 8
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 and 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.
PAGE 10
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 W U 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 IN VIN LT1086 + 5V OUT 121Ω 1% ADJ + 10µF C2 100µF 100µF 1k 365Ω 1% 2N3904 TTL 1k *NEEDED IF DEVICE IS FAR FROM FILTER CAPACITORS R2 †V OUT = 1.25V 1 + R1 ( ) LT1086 • TA05 LT1086 • TA04 Battery Charger LT1086 ( ( VOUT – 1.
PAGE 13
LT1086 Series U TYPICAL APPLICATIONS High Efficiency Dual Linear Supply L1 285µH IN MBR360 10k 1k + HEAT SINK 2N6667 Q1 DARLINGTON 1000µF ADJ 30k + MDA201 8 4700µF + 7 – 12V 1.5A OUT 124Ω* 2.4k 510k + LT1086 LT1004-2.5 + 20k* 2 100µF 30.1k* D1 1N4002 1.07k* LT1011 – 3 4 L1 285µH STANCOR P-8685 IN HEAT SINK 2N6667 Q2 DARLINGTON 1000µF MBR360 10k 1k + 130VAC TO 90VAC 30k 8 4700µF + 7 – 124Ω* 2.4k + MDA201 OUT ADJ 510k + LT1086 LT1004-2.5 + 20k* 2 100µF 30.
PAGE 14
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.
PAGE 15
LT1086 Series U PACKAGE DESCRIPTION K Package 2-Lead TO-3 Metal Can (Reference LTC DWG # 05-08-1310) 0.760 – 0.775 (19.30 – 19.69) 0.320 – 0.350 (8.13 – 8.89) 0.060 – 0.135 (1.524 – 3.429) 0.420 – 0.480 (10.67 – 12.19) 0.038 – 0.043 (0.965 – 1.09) 1.177 – 1.197 (29.90 – 30.40) 0.655 – 0.675 (16.64 – 17.15) 0.210 – 0.220 (5.33 – 5.59) 0.151 – 0.161 (3.86 – 4.09) DIA, 2PLCS 0.167 – 0.177 (4.24 – 4.49) R 0.425 – 0.435 (10.80 – 11.05) 0.067 – 0.077 (1.70 – 1.96) 0.490 – 0.510 (12.45 – 12.
PAGE 16
LT1086 Series U PACKAGE DESCRIPTION T Package 3-Lead Plastic TO-220 (Reference 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) 0.570 – 0.620 (14.478 – 15.748) 0.460 – 0.500 (11.684 – 12.700) 0.330 – 0.370 (8.382 – 9.398) 0.980 – 1.070 (24.892 – 27.178) 0.520 – 0.570 (13.208 – 14.478) 0.100 (2.540) BSC 0.218 – 0.252 (5.537 – 6.401) 0.013 – 0.023 (0.330 – 0.584) 0.