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Linear Technology Electronic Components Datasheet

LT1585A Datasheet

5A Low Dropout Fast Response Positive Regulators

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LT1585A/LT1585A-3.3
5A Low Dropout
Fast Response
Positive Regulators
Adjustable and Fixed
FEATURES
s Fast Transient Response
s Guaranteed Dropout Voltage at Multiple Currents
s Load Regulation: 0.05% Typ
s Trimmed Current Limit
s On-Chip Thermal Limiting
s Standard 3-Pin Power Package
U
APPLICATIONS
s Pentium® Processor Supplies
s PowerPCTM Supplies
s Other 2.5V to 3.6V Microprocessor Supplies
s Low Voltage Logic Supplies
s Battery-Powered Circuitry
s Post Regulator for Switching Supply
LT1585ACT
LT1585ACT-3.3
Adjustable
3.3V Fixed
DESCRIPTION
The LT®1585A/LT1585A-3.3 are low dropout 3-terminal
regulators with 5A output current capability. Design has
been optimized for low voltage applications where tran-
sient response and minimum input voltage are critical.
Similar to the LT1084 family, these regulators feature
lower dropout voltage and faster transient response.
These improvements make them ideal for low voltage
microprocessor applications requiring a regulated 2.5V to
3.6V output with an input supply below 7V.
Current limit is trimmed to ensure specified output current
and controlled short-circuit current. On-chip thermal lim-
iting provides protection against any combination of over-
load that would create excessive junction temperatures.
The LT1585A/LT1585A-3.3 are available in the industry
standard 3-pin TO-220 power package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Pentium is a registered trademark of Intel Corporation. PowerPC is a trademark of IBM Corporation.
TYPICAL APPLICATION
3.3V, 5A Regulator
VIN 4.75V
+ C1
10µF
LT1585A-3.3
3.3V
5A
+ C2*
10µF
* REQUIRED FOR STABILITY
1585A TA01
NOTE: MICROPROCESSOR APPLICATIONS WITH LOAD TRANSIENTS OF 3.8A REQUIRE
OUTPUT DECOUPLING CAPACITANCE >1300µF ON FIXED VOLTAGE PARTS TO ACHIEVE
< 50mV OF DEVIATION FROM NOMINAL OUTPUT. CONSULT FACTORY FOR DETAILS
Dropout Voltage vs Output Current
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0
OUTPUT CURRENT (A)
IFULL LOAD
LT1585A TA02
1


Linear Technology Electronic Components Datasheet

LT1585A Datasheet

5A Low Dropout Fast Response Positive Regulators

No Preview Available !

LT1585A/LT1585A-3.3
ABSOLUTE MAXIMUM RATINGS
VIN ............................................................................. 7V
Operating Junction Temperature Range
Control Section.................................... 0°C to 125°C
Power Transistor ................................. 0°C to 150°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PRECONDITIONI G
100% Thermal Limit Functional Test
PACKAGE/ORDER INFORMATION
FRONT VIEW
3
2
1
ORDER PART
NUMBER
VIN
VOUT LT1585ACT
ADJ
T PACKAGE
3-LEAD PLASTIC TO-220
θJA = 50°C/W
Consult factory for Industrial and Military grade parts.
FRONT VIEW
3
2
1
T PACKAGE
3-LEAD PLASTIC TO-220
θJA = 50°C/W
ORDER PART
NUMBER
VIN
VOUT LT1585ACT-3.3
GND
ELECTRICAL CHARACTERISTICS
PARAMETER
Reference Voltage LT1585A
Output Voltage LT1585A-3.3
Line Regulation LT1585A
(Notes 1, 2)
LT1585A-3.3
CONDITIONS
(VIN – VOUT) = 3V, TJ = 25°C, IOUT = 10mA
1.5V (VIN – VOUT) 5.75V, 10mA IOUT 5A
VIN = 5V, TJ = 25°C, IOUT = 0mA
4.75V VIN 7V, 0mA IOUT 5A
2.75V VIN 7V, IOUT = 10mA
4.75V VIN 7V, IOUT = 0mA
Load Regulation LT1585A
(Notes 1, 2, 3) LT1585A-3.3
(VN – VOUT) = 3V, TJ = 25°C, 10mA IOUT IFULL LOAD
VIN = 5V, TJ = 25°C, 0mA IOUT IFULL LOAD
Dropout Voltage LT1585A
LT1585A-3.3
VREF = 1%, IOUT = 3A
VOUT = 1%, IOUT = 3A
LT1585A
LT1585A-3.3
VREF = 1%, IOUT = 5A
VOUT = 1%, IOUT = 5A
Current Limit
(Note 3)
LT1585A
LT1585A-3.3
(VIN – VOUT) = 5.5V
(VIN – VOUT) = 5.5V
Adjust Pin Current LT1585A
Adjust Pin Current LT1585A
Change (Note 3)
Minimum
Load Current
LT1585A
Quiescent Current LT1585A-3.3
1.5V (VIN – VOUT) 5.75V, 10mA IOUT IFULL LOAD
1.5V (VIN – VOUT) 5.75V
VIN = 5V
MIN TYP MAX UNITS
1.238 (–1%) 1.250 1.262 (+1%)
q 1.225 (–2%) 1.250 1.275 (+2%)
V
V
3.267 (–1%) 3.300 3.333 (+1%)
q 3.235 (– 2%) 3.300 3.365 (+ 2%)
V
V
q
0.005
0.2
%
0.05 0.3
%
q
0.05 0.5
%
q
1.150 1.300
V
q
1.200 1.400
V
q 5.0
q
q
q
q
6.0
55 120
0.2 5
2 10
8 13
A
µA
µA
mA
mA
2


Part Number LT1585A
Description 5A Low Dropout Fast Response Positive Regulators
Maker Linear Technology
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LT1585A Datasheet PDF






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