LT1581CT7-2.5 Linear Technology, LT1581CT7-2.5 Datasheet

IC LDO REGULATOR 10A 2.5V TO2207

LT1581CT7-2.5

Manufacturer Part Number
LT1581CT7-2.5
Description
IC LDO REGULATOR 10A 2.5V TO2207
Manufacturer
Linear Technology
Datasheet

Specifications of LT1581CT7-2.5

Applications
Converter, Intel Pentium®
Voltage - Input
1.68 ~ 6 V
Number Of Outputs
1
Voltage - Output
2.5V
Operating Temperature
0°C ~ 125°C
Mounting Type
Through Hole
Package / Case
TO-220-7 (Bent and Staggered Leads)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
APPLICATIONS
FEATURES
TYPICAL
3.3V
0.2A
10A
5V
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
Microprocessor Supplies
Post Regulators for Switching Supplies
High Current Regulators
5V to 3.XXV for Pentium
at 90MHz to 166MHz and Beyond
3.3V to 2.9V for Portable Pentium Processor
PowerPC
+
+
330 F
OS-CON
10 F
TANT
TM
2.5V Microprocessor Supply
APPLICATION
Series Power Supplies
POWER
CONTROL
GND
U
LT1581-2.5
OUTPUT
®
SENSE
ADJ
Processors Operating
0.1 F
U
2.5V/10A
+
100 F TANT
AVX TPS
7
1581 TA01
DESCRIPTION
The LT
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.
Pentium is a registered trademark of Intel Corporation.
PowerPC is a trademark of IBM Corporation.
, LTC and LT are registered trademarks of Linear Technology Corporation.
®
1581 is a 10A low dropout regulator designed to
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
Dropout Regulators
0
1
INDICATES GUARANTEED TEST POINTS
DATA SHEET LIMIT
Minimum Power Voltage
U
2
Dropout Voltage –
OUTPUT CURRENT (A)
3
LT1581/LT1581-2.5
10A, Very Low
4
5
T
J
= 25 C
6
7
T
J
8
= 125 C
1581 G03
9
10
1

Related parts for LT1581CT7-2.5

LT1581CT7-2.5 Summary of contents

Page 1

... A small capacitor on the ADJUST pin further improves transient response. This device is ideal for generating processor supplies 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. 0.8 2.5V/10A ...

Page 2

... Pulse Thermal Resistance, Junction-to-Case Control Circuitry/Power Transistor 2 U RATINGS PACKAGE/ORDER TAB IS OUTPUT *PIN2 = NC FOR LT1581CT7, GND FOR LT1581CT7-2.5 Consult factory for Industrial and Military grade parts. The denotes specifications which apply over the full operating = 25 C. (Note 5V 3.3V 0mA POWER ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T PARAMETER CONDITIONS Dropout Voltage (Note 3) Minimum V : LT1581-2.5 V CONTROL POWER (V – CONTROL OUT POWER V POWER V POWER V POWER Minimum V : LT1581 ...

Page 4

LT1581/LT1581-2 TYPICAL PERFORMANCE CHARACTERISTICS Control Pin Current vs Output Current 200 INDICATES GUARANTEED TEST POINTS 180 160 140 120 DATA SHEET LIMIT 100 80 TYPICAL 60 DEVICE ...

Page 5

W BLOCK DIAGRA ADJ U U APPLICATIONS INFORMATION The LT1581 is a low dropout regulator designed to power the new generation of microprocessors. Low dropout regulators have become more common in desktop com- puter systems as microprocessor manufacturers have moved ...

Page 6

LT1581/LT1581-2 APPLICATIONS INFORMATION processors cycle load current from several hundred mil- liamperes to several amperes in tens of nanoseconds. Output voltage tolerances are tighter and include transient response as part of the specification. The LT1581 is designed to ...

Page 7

U U APPLICATIONS INFORMATION 5V CONTROL 3.3V POWER SENSE LT1581 OUTPUT ADJ R1 R2 Figure 1. Conventional Load Sensing 5V CONTROL 3.3V SENSE POWER LT1581 OUTPUT ADJ R1 R2 Figure 2. Remote Load Sensing ( I )(R ) OUT P ...

Page 8

LT1581/LT1581-2 APPLICATIONS INFORMATION network must handle until the regulator throttles to the load current level. Capacitors are not ideal elements and contain parasitic resistance and inductance. These para- sitic elements dominate the change in output voltage at the ...

Page 9

U U APPLICATIONS INFORMATION 1000 F to 5000 F, and with the V neously shorted to ground can damage occur. A crowbar circuit at the power input can generate those levels of current and a diode from output to power ...

Page 10

... If the case of the device must be electroni- cally isolated, a thermally conductive spacer can be used as long as the added contribution to thermal resistance is considered. Please consult Linear Technology’s “Mount- ing Considerations for Power Semiconductors,” 1990 Linear Applications Handbook, Volume 1 , Pages RR3-1 to RR3-20. Note that the case of the LT1581 is electrically connected to the output ...

Page 11

... Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 2.5V/10A Regulator ...

Page 12

... COMMENTS > 90% Efficiency High Current Microprocessor Supply > 90% Efficiency in 12V to 3.3V Applications Fast Transient Response, No Bulk Capacitors Needed For 3.3V to 2.XXV Applications For High Performance Microprocessors For High Performance Microprocessors 158125fa LT/TP 0399 2K REV A • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1996 ...

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