LT1086 Linear Technology Corporation, LT1086 Datasheet

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LT1086

Manufacturer Part Number
LT1086
Description
Manufacturer
Linear Technology Corporation
Datasheet

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FEATURES
APPLICATIO S
TYPICAL APPLICATIO
V
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
Ripple Rejection >75dB
Available in 3-Pin TO-220 and 3-Pin DD Packages
SCSI-2 Active Terminator
High Efficiency Linear Regulators
Post Regulators for Switching Supplies
Constant Current Regulators
Battery Chargers
Microprocessor Supply
IN
4.75V
*MAY BE OMITTED IF INPUT SUPPLY IS WELL
BYPASSED WITHIN 2" OF THE LT1086
10 F*
TANTALUM
U
5V to 3.3V Regulator
IN
LT1086-3.3
GND
U
OUT
LT1086 • TA01
10 F
TANTALUM
3.3V AT 1.5A
Fixed 2.85V , 3.3V, 3.6V, 5V , 12V
Regulators Adjustable and
DESCRIPTIO
The LT
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 10 F 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
, LTC and LT are registered trademarks of Linear Technology Corporation.
®
1086 is designed to provide up to 1.5A output
0
2
1
0
INDICATES GUARANTEED TEST POINT
U
LT1086 Dropout Voltage
–55 C T
0 C T
0.5
OUTPUT CURRENT (A)
J
J
150 C
125 C
1
LT1086 Series
T
T
T
J
J
J
= – 55 C
= 25 C
= 150 C
LT1086 • TA02
1.5
sn1086 1086ffs
1

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LT1086 Summary of contents

Page 1

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

Page 2

... LT1086 Series ABSOLUTE MAXIMUM Power Dissipation ............................... Internally Limited Input Voltage* ......................................................... 30V Operating Input Voltage Adjustable Devices ........................................... 25V 2.85V Devices .................................................. 18V 3.3V, 3.6V, and 5V Devices ............................... 20V 12V Devices ...................................................... 25V Operating Junction Temperature Range “C” Grades Control Section ............................... 125 C Power Transistor ............................. 150 C “ ...

Page 3

... LT1086/-2.85/-3.3/-3.6/-5/-12 (V – OUT LT1086H V REF The denotes the specifications which apply over the full operating = 10mA – OUT 1.5A, (0.5A for LT1086H), 1.5V (V OUT = 0mA 1.5A, 4.35V V 18V OUT 0mA OUT J 18V 1.5A IN OUT ...

Page 4

... Load regulation is measured at the output lead 1/8" from the package. Note 3: Line and load regulation are guaranteed up to the maximum power dissipation of 15W (3W for the LT1086H). Power dissipation is determined 4 The denotes the specifications which apply over the full operating = 25 C ...

Page 5

... – INPUT/OUTPUT DIFFERENTIAL (V) LT1086 • TPC03 LT1086 Maximum Power Dissipation* 20 LT1086MK 15 LT1086CT 10 LT1086CK 100 110 120 130 140 150 CASE TEMPERATURE ( C) *AS LIMITED BY MAXIMUM JUNCTION TEMPERATURE LT1086 • ...

Page 6

... R V 0.5V RIPPLE P OUT ADJ OUT 0 0 0.25 0.75 1.0 1.25 0.5 OUTPUT CURRENT (A) LT1086 • TPC10 LT1086 Line Transient Response ADJ 0 – ADJ – 10V OUT I = 0.2A OUT – TANTALUM TANTALUM 14 OUT ...

Page 7

... RIPPLE P-P (V – OUT 10k 100k LT1086 • TPC19 *AS LIMITED BY MAXIMUM JUNCTION TEMPERATURE V IN LIMIT LT1086 Series LT1086H Maximum Power Dissipation* LT1086MH 100 110 120 130 140 150 CASE TEMPERATURE ( C) LT1086 • TPC20 + – 1086 • ...

Page 8

... F to 5000 F, and with the input 20 F pin instantaneously shorted to ground, can damage occur. A crowbar circuit at the input of the LT1086 can generate those kinds of currents and a diode from output to input is then recommended. Normal power supply cycling or even sn1086 1086ffs ...

Page 9

... C ADJ 10 F Overload Recovery Like any of the IC power regulators, the LT1086 has safe area protection. The safe area protection decreases the current limit as input-to-output voltage increases and keeps the power transistor inside a safe operating region for all values of input-to-output voltage. The LT1086 ...

Page 10

... U APPLICATIONS INFORMATION Load Regulation Because the LT1086 is a 3-terminal device not possible to provide true remote load sensing. Load regu- lation will be limited by the resistance of the wire connect- ing the regulator to the load. The data sheet specification for load regulation is measured at the bottom of the package ...

Page 11

... LT1086 OUT 121 ADJ 365 1% *REQUIRED FOR STABILITY SCSI-2 Active Termination TERMPWR IN LT1086-2.85 OUT GND + 10 F TANTALUM LT1086 Series TANTALUM LT1086 • AI02 110 110 2% 0.1 F 110 CERAMIC 110 2% 18 TOTAL 110 110 2% LT1086 • TA03 sn1086 1086ffs 11 ...

Page 12

... LT1086 • TA04 Adjusting Output Voltage of Fixed Regulators > 12V OUT IN R1 LT1086 • TA06 10V OUT + TTL OR 100 F CMOS 5V LT1086 • TA08 Remote Sensing R P (MAX DROP 300mV) LT1086 OUT + ADJ V IN 100 LM301A 1 121 100pF 365 ...

Page 13

... F LT1086 Series 12V LT1086 OUT 1.5A ADJ 124 * LT1004-2.5 + 100 F 20k* 30.1k* D1 1.07k* 1N4002 LT1086 OUT ADJ 124 * LT1004-2.5 + 100 F 20k* 30.1k* D2 1.07k* 1N4002 –12V 1.5A LT1086 • TA11 12V 1.5A 124 * + 1N4002 10 F 1.07k* 124 * + 1N4002 10 F 1.07k* –12V 1.5A LT1086 • TA12 sn1086 1086ffs 13 ...

Page 14

... FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS OBSOLETE PACKAGE Improving Ripple Rejection IN LT1086 OUT R1 ADJ 121 365 LT1086 • TA14 Low Dropout Negative Supply LT1086-12 OUT IN GND + + 10,000 F LT1086 • TA16 0.200 (5.080) 0.100 TYP (2.540) PIN 1 0.100 (2.540) ...

Page 15

... BSC LT1086 Series 0.151 – 0.161 (3.86 – 4.09) DIA, 2PLCS 0.167 – 0.177 (4.24 – 4.49 (TO-3) 1098 0.165 – 0.180 (4.191 – 4.572) 0.045 – 0.055 (1.143 – 1.397) 15 TYP 0 ...

Page 16

... LT1086 Series PACKAGE DESCRIPTION 0.390 – 0.415 (9.906 – 10.541) 0.460 – 0.500 (11.684 – 12.700) 0.980 – 1.070 (24.892 – 27.178) 0.520 – 0.570 (13.208 – 14.478) 0.100 (2.540) BSC 0.028 – 0.038 (0.711 – 0.965) RELATED PARTS PART NUMBER ...

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