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Linear Technology Electronic Components Datasheet

LT1528 Datasheet

3A Low Dropout Regulator

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LT1528
3A Low Dropout Regulator
for Microprocessor Applications
FEATURES
n Dropout Voltage: 0.6V at IOUT = 3A
n Fast Transient Response
n Output Current: 3A
n Quiescent Current: 400μA
n No Protection Diodes Needed
n Fixed Output Voltage: 3.3V
n Controlled Quiescent Current in Dropout
n Shutdown IQ = 125μA
n Stable with 3.3μF Output Capacitor
n Reverse Battery Protection
n No Reverse Output Current
n Thermal Limiting
APPLICATIONS
n Microprocessor Applications
n Post Regulator for Switching Supplies
n 5V to 3.3V Logic Regulator
DESCRIPTION
The LT ®1528 is a 3A low dropout regulator optimized to
handle the large load current transients associated with
the current generation of microprocessors. This device has
the fastest transient response of currently available PNP
regulators and is very tolerant of variations in capacitor
ESR. Dropout voltage is 75mV at 10mA, rising to 300mV
at 1A and 600mV at 3A. The device has a quiescent cur-
rent of 400μA. Quiescent current is well controlled; it does
not increase significantly as the device enters dropout.
The regulator can operate with output capacitors as small
as 3.3μF, although larger capacitors will be needed to
achieve the performance required in most microprocessor
applications. The LT1528 is available with a fixed output
voltage of 3.3V. An external SENSE pin allows adjustment
to output voltages greater than 3.3V, using a simple resis-
tive divider. This allows the device to be adjusted over a
wide range of output voltages, including the 3.3V to 4.2V
range required by a variety of processors from Intel, IBM,
AMD, and Cyrix.
The LT1528 has both reverse input and reverse output
protection and includes a shutdown feature. Quiescent
current drops to 125μA in shutdown. The LT1528 is avail-
able in 5-lead TO-220 and 5-lead DD-PAK packages.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
TYPICAL APPLICATION
Microprocessor Supply with Shutdown
5 IN
OUT 1
VIN =5V
LT1528
4 SHDN
SENSE 2
GND
3
VOUT
15Ω 68Ω + 4 × 47μF*
SOLID TANTALUM
J1 J2
J3
330Ω
VSHDN (PIN 4)
<0.25
>2.80
NC
OUTPUT
OFF
ON
ON
SHORTING
J1
J2
J3
VOUT
3.30
3.45
4.00
*CHOOSE CAPACITORS
TO MEET PROCESSOR
REQUIREMENTS
1528 TA01
Dropout Voltage
0.6
0.5
0.4
0.3
0.2
0.1
0
0 0.5 1.0 1.5 2.0 2.5 3.0
OUTPUT CURRENT (mA)
1528 TA02
1528fb
1


Linear Technology Electronic Components Datasheet

LT1528 Datasheet

3A Low Dropout Regulator

No Preview Available !

LT1528
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Voltage........................................................ ±15V*
OUTPUT Pin Reverse Current ................................10mA
SENSE Pin Current.................................................10mA
SHDN Pin Input Voltage (Note 2)..................6.5V, – 0.3V
SHDN Pin Input Current (Note 2).............................5mA
Output Short-Circuit Duration .......................... Indefinite
Storage Temperature Range................... –65°C to 150°C
Operating Junction Temperature Range
LT1528C................................................ 0°C to 125°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
*For applications requiring input voltage ratings greater than 15V,
contact the factory.
PIN CONFIGURATION
FRONT VIEW
TAB IS
GND
5 VIN
4 SHDN
3 GND
2 SENSE
1 OUTPUT
Q PACKAGE
5-LEAD PLASTIC DD
TJMAX = 125°C, θJA = 30°C/ W
TAB IS
GND
FRONT VIEW
5
4
3
2
1
T PACKAGE
5-LEAD PLASTIC TO-220
TJMAX = 125°C, θJA = 50°C/ W
VIN
SHDN
GND
SENSE
OUTPUT
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LT1528CQ#PBF
LT1528CQ#TRPBF
LT1528CQ
5-Lead Plastic DD-PAK
LT1528CT#PBF
LT1528CT#TRPBF
LT1528CT
5-Lead Plastic TO-220
LEAD BASED FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LT1528CQ
LT1528CQ#TR
LT1528CQ
5-Lead Plastic DD-PAK
LT1528CT
LT1528CT#TR
LT1528CT
5-Lead Plastic TO-220
Consult LTC Marketing for parts specified with wider operating temperature ranges.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
0°C to 125°C
0°C to 125°C
TEMPERATURE RANGE
0°C to 125°C
0°C to 125°C
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TJ = 25°C.
PARAMETER
Regulated Output Voltages (Notes 3, 4)
Line Regulation (Note 4)
Load Regulation (Note 4)
Dropout Voltage (Note 5)
CONDITIONS
VIN = 3.8V, IOUT = 1mA
4.3V < VIN < 15V, 1mA < IOUT < 3A
ΔVIN = 3.8V to 15V, IOUT = 1mA
ΔILOAD = 1mA to 3A, VIN = 4.3V
ΔILOAD = 1mA to 3A, VIN = 4.3V
ILOAD = 10mA
ILOAD = 10mA
MIN
3.250
l 3.200
l
l
l
TYP
3.300
3.300
1.5
12
15
70
MAX
3.350
3.400
1.0
20
30
110
150
UNITS
V
V
mV
mV
mV
mV
mV
1528fb
2


Part Number LT1528
Description 3A Low Dropout Regulator
Maker Linear Technology
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LT1528 Datasheet PDF






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