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Linear Technology Electronic Components Datasheet

LT1086 Datasheet

1.5A Low Dropout Positive Regulators

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LT1086 Series
1.5A Low Dropout Positive
Regulators Adjustable and
Fixed 2.85V, 3.3V, 3.6V, 5V, 12V
FEATURES
s 3-Terminal Adjustable or Fixed
2.85V, 3.3V, 3.6V, 5V, 12V
s Output Current of 1.5A (0.5A for LT1086H)
s Operates Down to 1V Dropout
s Guaranteed Dropout Voltage at Multiple Current Levels
s Line Regulation: 0.015%
s Load Regulation: 0.1%
s 100% Thermal Limit Functional Test
s Ripple Rejection >75dB
s Available in 3-Pin TO-220 and 3-Pin DD Packages
U
APPLICATIO S
s SCSI-2 Active Terminator
s High Efficiency Linear Regulators
s Post Regulators for Switching Supplies
s Constant Current Regulators
s Battery Chargers
s Microprocessor Supply
DESCRIPTIO
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
5V to 3.3V Regulator
VIN 4.75V
IN
10µF*
TANTALUM
LT1086-3.3 OUT
GND
3.3V AT 1.5A
10µF
TANTALUM
LT1086 • TA01
*MAY BE OMITTED IF INPUT SUPPLY IS WELL
BYPASSED WITHIN 2" OF THE LT1086
LT1086 Dropout Voltage
2
INDICATES GUARANTEED TEST POINT
–55°C TJ 150°C
0°C TJ 125°C
1
TJ = – 55°C
TJ = 25°C
TJ = 150°C
0
0 0.5 1
1.5
OUTPUT CURRENT (A)
LT1086 • TA02
sn1086 1086ffs
1


Linear Technology Electronic Components Datasheet

LT1086 Datasheet

1.5A Low Dropout Positive Regulators

No Preview Available !

LT1086 Series
ABSOLUTE MAXIMUM RATINGS (Note 1)
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 ............................... 0°C to 125°C
Power Transistor ............................. 0°C to 150°C
“I” Grades
Control Section .......................... – 40°C to 125°C
Power Transistor ........................ – 40°C to 150°C
“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
2.85V device, 20V for a 5V device, and 25V for adjustable and12V devices) the
devices are guaranteed to withstand transient input voltages up to 30V. For
input voltages greater than the maximum operating input voltage some
degradation of specifications will occur. For fixed voltage devices operating at
input/output voltage differentials greater than 15V, a minimum external load
of 5mA is required to maintain regulation.
PRECONDITIONING
100% Thermal Shutdown Functional Test.
PACKAGE/ORDER INFORMATION
BOTTOM VIEW
ADJ
2
VIN 1 3 VOUT
(CASE)
ORDER
PART NUMBER
LT1086CH
LT1086MH
H PACKAGE
3-LEAD TO-39 METAL CAN
θJA = 150°C/W
VIN
ADJ (GND)*
BOTTOM VIEW
2
CASE
IS OUTPUT
ORDER
PART NUMBER
LT1086CK
LT1086CK-5
LT1086CK-12
1 LT1086IK
LT1086IK-5
K PACKAGE
2-LEAD TO-3 METAL CAN
θJA = 35°C/W
LT1086IK-12
LT1086MK
LT1086MK-5
LT1086MK-12
OBSOLETE PACKAGES
Consider the T Package for Alternate Source
For fixed versions.
Consult LTC Marketing for parts specified with wider operating temperature ranges.
FRONT VIEW
TAB IS
OUTPUT
3 VIN
2 VOUT
1 ADJ
(GND)
M PACKAGE
3-LEAD PLASTIC DD
θJA = 30°C/W**
** WITH PACKAGE SOLDERED TO 0.5IN2 COPPER AREA
OVER BACKSIDE GROUND PLANE OR INTERNAL POWER
PLANE. θJA CAN VARY FROM 20°C/W TO > 40°C/W
DEPENDING ON MOUNTING TECHNIQUE.
TAB IS
OUTPUT
FRONT VIEW
3
2
1
T PACKAGE
3-LEAD PLASTIC TO-220
θJA = 50°C/W
VIN
VOUT
ADJ
(GND)
ORDER
PART NUMBER
LT1086CM
LT1086CM-3.3
LT1086CM-3.6
LT1086IM
LT1086IM-3.3
ORDER
PART NUMBER
LT1086CT
LT1086CT-2.85
LT1086CT-3.3
LT1086IT
LT1086IT-5
LT1086IT-12
LT1086CT-3.6
LT1086CT-5
LT1086CT-12
2
sn1086 1086ffs


Part Number LT1086
Description 1.5A Low Dropout Positive Regulators
Maker Linear
Total Page 16 Pages
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