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LT1581-2.5 Datasheet

  • LT1581-2.5

  • 10A, Very Low Dropout Regulators

  • 12頁

  • LINER

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LT1581/LT1581-2.5
10A, Very Low
Dropout Regulators
FEATURES
s
s
s
s
s
s
DESCRIPTION
The LT
廬
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.
Low Dropout, 430mV at 10A Output Current
Fast Transient Response
Remote Sense
1mV Load Regulation
Fixed 2.5V Output and Adjustable Output
No Supply Sequencing Problems in
Dual Supply Mode
APPLICATIONS
s
s
s
s
s
s
Microprocessor Supplies
Post Regulators for Switching Supplies
High Current Regulators
5V to 3.XXV for Pentium
廬
Processors Operating
at 90MHz to 166MHz and Beyond
3.3V to 2.9V for Portable Pentium Processor
PowerPC
TM
Series Power Supplies
TYPICAL APPLICATION
2.5V Microprocessor Supply
0.8
POWER
OUTPUT
2.5V/10A
Dropout Voltage 鈥?/div>
Minimum Power Voltage
INDICATES GUARANTEED TEST POINTS
MINIMUM POWER VOLTAGE (V)
(V
POWER
鈥?V
OUT
) (V)
3.3V
10A
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
1
2
3 4 5 6 7 8
OUTPUT CURRENT (A)
9
10
T
J
= 25擄C
T
J
= 125擄C
DATA SHEET LIMIT
+
330碌F
OS-CON
+
LT1581-2.5
100碌F TANT
AVX TPS
脳
7
5V
0.2A
CONTROL
SENSE
ADJ
0.1碌F
1581 TA01
+
10碌F
TANT
GND
U
U
U
1581 G03
1

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