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LT1581 Datasheet

10A/ Very Low Dropout Regulators

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LT1581/LT1581-2.5
10A, Very Low
Dropout Regulators
FEATURES
s Low Dropout, 430mV at 10A 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 ®1581 is a 10A 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 430mV at 10A. 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 LT1581.
A remote SENSE pin is brought out. This feature virtually
eliminates output voltage variations due to load changes.
Typical load regulation for a load current step of 100mA to
10A, measured at the SENSE pin, is less than 1mV.
The LT1581 has fast transient response, equal to the
LT1584. On fixed voltage devices, the ADJUST pin is
brought out. A small capacitor on the ADJUST 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
10A +
POWER
330µF
OUTPUT
OS-CON
LT1581-2.5
5V
0.2A
+
10µF
CONTROL
GND
TANT
SENSE
ADJ
0.1µF
2.5V/10A
+ 100µF TANT
AVX TPS
×7
1581 TA01
Dropout Voltage –
Minimum Power Voltage
0.8
INDICATES GUARANTEED TEST POINTS
0.7
0.6
0.5 DATA SHEET LIMIT
0.4
0.3
TJ = 125°C
0.2 TJ = 25°C
0.1
0
0 1 2 3 4 5 6 7 8 9 10
OUTPUT CURRENT (A)
1581 G03
1


Linear Technology Electronic Components Datasheet

LT1581 Datasheet

10A/ Very Low Dropout Regulators

No Preview Available !

LT1581/LT1581-2.5
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VPOWER Input Voltage ................................................ 6V
VCONTROL Input Voltage ........................................... 13V
Operating Junction Temperature Range
Control Section ...................................... 0°C to 125°C
Power Transistor ................................... 0°C to 150°C
Storage Temperature ............................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PRECONDITIONING
100% Thermal Limit Functional Test
PACKAGE/ORDER INFORMATION
FRONT VIEW
7 NC
6 VCONTROL
5 VPOWER
4 OUTPUT
3 SENSE
2 NC/GND*
1 ADJUST
TAB IS
OUTPUT
T7 PACKAGE
7-LEAD PLASTIC TO-220
θJA = 50°C/ W
*PIN2 = NC FOR LT1581CT7, GND FOR LT1581CT7-2.5
ORDER PART
NUMBER
LT1581CT7
LT1581CT7-2.5
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 2)
PARAMETER
CONDITIONS
Output Voltage: LT1581-2.5
Reference Voltage: LT1581
(VADJ = 0V)
Line Regulation: LT1581-2.5
LT1581
Load Regulation: LT1581-2.5
LT1581 (VADJ = 0V)
Minimum Load Current: LT1581
Control Pin Current: LT1581-2.5
(Note 5)
Control Pin Current: LT1581
(Note 5)
Ground Pin Current: LT1581-2.5
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 = 3.3V to 5.5V, ILOAD = 0mA to 10A
VCONTROL = 2.75V, VPOWER = 2V, ILOAD = 10mA
VCONTROL = 2.7V to 12V, VPOWER = 1.75V to 5.5V, ILOAD = 0mA to 4A
VCONTROL = 2.7V to 12V, VPOWER = 2.05V to 5.5V, ILOAD = 0mA to 10A
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
VCONTROL = 5V, VPOWER = 3.3V, ILOAD = 0mA to 10A
VCONTROL = 2.75V, VPOWER = 2.1V, ILOAD = 10mA to 10A
VCONTROL = 5V, VPOWER = 3.3V, VADJ = 0V (Note 4)
VCONTROL = 5V, VPOWER = 3.3V, ILOAD = 100mA
VCONTROL = 5V, VPOWER = 3.3V, ILOAD = 4A
VCONTROL = 5V, VPOWER = 3.3V, ILOAD = 7A
VCONTROL = 5V, VPOWER = 3.3V, ILOAD = 10A
VCONTROL = 2.75V, VPOWER = 2.05V, ILOAD = 100mA
VCONTROL = 2.75V, VPOWER = 2.05V, ILOAD = 4A
VCONTROL = 2.75V, VPOWER = 2.05V, ILOAD = 7A
VCONTROL = 2.75V, VPOWER = 2.05V, ILOAD = 10A
VCONTROL = 5V, VPOWER = 3.3V, ILOAD = 0mA
Adjust Pin Current: LT1581 (VADJ = 0V) VCONTROL = 2.75V, VPOWER = 2.05V, ILOAD = 10mA
Current Limit: LT1581-2.5
VCONTROL = 5V, VPOWER = 3.3V, VOUT = 100mV
LT1581 (VADJ = 0V) VCONTROL = 2.75V, VPOWER = 2.05V, VOUT = 100mV
Ripple Rejection: LT1581-2.5
VCONTROL = VPOWER = 5V Avg, VRIPPLE = 1VP-P, fRIPPLE = 120Hz,
IOUT = 4A, TJ = 25°C
LT1581
VCONTROL = VPOWER = 3.75V Avg, VRIPPLE = 1VP-P, fRIPPLE = 120Hz,
VADJ = 0V, IOUT = 4A, TJ = 25°C
Thermal Regulation
30ms Pulse
Thermal Resistance, Junction-to-Case Control Circuitry/Power Transistor
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
MIN
2.485
2.475
2.475
1.243
1.237
1.237
10.1
10.1
55
TYP
2.500
2.500
2.500
1.250
1.250
1.250
1
1
1
1
3
5
20
40
70
5
20
40
70
6
60
11
11
80
MAX
2.515
2.525
2.525
1.257
1.263
1.263
3
3
10
5
10
10
50
100
170
10
50
100
170
10
120
UNITS
V
V
V
V
V
V
mV
mV
mV
mV
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
µA
A
A
dB
60 80
dB
0.004 0.020
0.65/2.50
%/W
°C/W
2


Part Number LT1581
Description 10A/ Very Low Dropout Regulators
Maker Linear Technology
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LT1581 Datasheet PDF






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