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Linear Technology Electronic Components Datasheet

LT1580 Datasheet

Very Low Dropout Regulator

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LT1580/LT1580 -2.5
7A, Very Low
Dropout Regulator
FEATURES
s Low Dropout, 540mV at 7A Output Current
s Fast Transient Response
s Remote Sense
s 1mV Load Regulation
s Fixed 2.5V Output and Adjustable Output
s No Supply Sequencing Problems in
Dual Supply Mode
U
APPLICATIONS
s Microprocessor Supplies
s Post Regulators for Switching Supplies
s High Current Regulators
s 5V to 3.XXV for Pentium® Processors Operating
at 90MHz to 166MHz and Beyond
s 3.3V to 2.9V for Portable Pentium Processor
s PowerPCTM Series Power Supplies
DESCRIPTION
The LT ®1580 is a 7A low dropout regulator designed to
power the new generation of microprocessors. The drop-
out voltage of this device is 100mV at light loads rising to
just 540mV at 7A. To achieve this dropout, a second low
current input voltage 1V greater than the output voltage, is
required. The device can also be used as a single supply
device where dropout is comparable to an LT1584.
Several other new features have been added to the LT1580.
A remote SENSE pin is brought out. This feature virtually
eliminates output voltage variations due to load changes.
Typical load regulation, measured at the SENSE pin, for a
load current step of 100mA to 7A is less than 1mV.
The LT1580 has fast transient response, equal to the
LT1584. On fixed voltage devices, the ADJ pin is brought
out. A small capacitor on the ADJ pin further improves
transient response.
This device is ideal for generating processor supplies of
2V to 3V on motherboards where both 5V and 3.3V
supplies are available.
, 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
2.5V Microprocessor Supply
3.3V
7A +
VPOWER
330µF
VOUT
OS-CON
LT1580-2.5
2.5V/7A
+ 100µF TANT
AVX TPS
×7
5V
0.2A + 10µF
TANT
VCONTROL
GND
SENSE
ADJ
0.1µF
1580 TA01
Dropout Voltage —
Minimum Power Voltage
1.0
INDICATES GUARANTEED TEST POINTS
0°C TJ 125°C
DATA SHEET LIMIT
0.5
TJ = 125°C
TJ = 25°C
0
012 34 567
OUTPUT CURRENT (A)
1580 G03
1


Linear Technology Electronic Components Datasheet

LT1580 Datasheet

Very Low Dropout Regulator

No Preview Available !

LT1580/LT1580 -2.5
ABSOLUTE MAXIMUM RATINGS
VPOWER Input Voltage ................................................ 6V
VCONTROL Input Voltage ........................................... 13V
Storage Temperature ............................ – 65°C to 150°C
Operating Junction Temperature Range
Control Section
LT1580C ........................................... 0°C to 125°C
LT1580I ........................................ – 40°C to 125°C
Power Transistor
LT1580C ........................................... 0°C to 150°C
LT1580I ........................................ – 40°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PRECONDITIONING
100% Thermal Limit Functional Test
PACKAGE/ORDER INFORMATION
TAB
IS
OUTPUT
FRONT VIEW
5
4
3
2
1
Q PACKAGE
5-LEAD PLASTIC DD
θJA = 30°C/ W
VPOWER
VCONTROL
VOUT
ADJ
SENSE
ORDER PART
NUMBER
LT1580CQ
LT1580IQ
TAB
IS
OUTPUT
TAB
IS
OUTPUT
FRONT VIEW
7
6
5
4
3
2
1
R PACKAGE
7-LEAD PLASTIC DD
θJA = 30°C/ W
NC
VPOWER
ADJ
VOUT
VCONTROL
GND
SENSE
Consult factory for Military grade parts.
ORDER PART
NUMBER
LT1580CR-2.5
LT1580IR-2.5
TAB
IS
OUTPUT
FRONT VIEW
5
4
3
2
1
T PACKAGE
5-LEAD PLASTIC TO-220
θJA = 50°C/ W
FRONT VIEW
7
6
5
4
3
2
1
T7 PACKAGE
7-LEAD PLASTIC TO-220
θJA = 50°C/ W
VPOWER
VCONTROL
VOUT
ADJ
SENSE
ORDER PART
NUMBER
LT1580CT
LT1580IT
NC
VPOWER
ADJ
VOUT
VCONTROL
GND
SENSE
ORDER PART
NUMBER
LT1580CT7-2.5
LT1580IT7-2.5
ELECTRICAL CHARACTERISTICS (Note 1)
PARAMETER
Output Voltage: LT1580-2.5
Reference Voltage: LT1580
(VADJ = 0V)
Line Regulation: LT1580-2.5
LT1580
CONDITIONS
VCONTROL = 5V, VPOWER = 3.3V, ILOAD = 0mA
VCONTROL = 4V to 12V, VPOWER = 3V to 5.5V, ILOAD = 0mA to 4A
VCONTROL = 4V to 12V, VPOWER = 3V to 5.5V,
ILOAD = 0mA to 7A, 0°C TJ 125°C
VCONTROL = 4V to 12V, VPOWER = 3V to 5.5V,
ILOAD = 0mA to 6.5A, – 40°C TJ < 0°C
VCONTROL = 2.75V, VPOWER = 2V, ILOAD = 10mA
VCONTROL = 2.7V to 12V, VPOWER = 1.75V to 5.5V, ILOAD = 10mA to 4A
VCONTROL = 2.7V to 12V, VPOWER = 2.05V to 5.5V,
ILOAD = 10mA to 7A, 0°C TJ 125°C
VCONTROL = 2.7V to 12V, VPOWER = 2.05V to 5.5V,
ILOAD = 10mA to 6.5A, – 40°C TJ < 0°C
VCONTROL = 3.65V to 12V, VPOWER = 3V to 5.5V, ILOAD = 10mA
VCONTROL = 2.5V to 12V, VPOWER = 1.75V to 5.5V, ILOAD = 10mA
q
q
q
q
MIN
2.485
2.475
2.475
2.460
1.243
1.237
1.237
1.232
TYP
2.500
2.500
2.500
MAX
2.515
2.525
2.525
UNITS
V
V
V
2.500 2.525
V
1.250 1.257
1.250 1.263
1.250 1.263
1.250 1.263
V
V
V
V
13
13
mV
mV
2


Part Number LT1580
Description Very Low Dropout Regulator
Maker Linear
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LT1580 Datasheet PDF






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