LT1580IQ#TRPBF Linear Technology, LT1580IQ#TRPBF Datasheet

IC LDO REGULATOR 7A ADJ DDPKA-5

LT1580IQ#TRPBF

Manufacturer Part Number
LT1580IQ#TRPBF
Description
IC LDO REGULATOR 7A ADJ DDPKA-5
Manufacturer
Linear Technology
Datasheet

Specifications of LT1580IQ#TRPBF

Applications
Converter, Intel Pentium®
Voltage - Input
1.79 ~ 6 V
Number Of Outputs
1
Voltage - Output
1.25 ~ 4.65 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
D²Pak, TO-263 (5 leads + tab)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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LT1580IQ#TRPBF
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APPLICATIONS
FEATURES
TYPICAL
3.3V
0.2A
7A
5V
Low Dropout, 540mV at 7A 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
APPLICATION
Series Power Supplies
2.5V Microprocessor Supply
V
V
GND
POWER
CONTROL
U
LT1580-2.5
®
SENSE
V
ADJ
Processors Operating
OUT
0.1 F
U
2.5V/7A
+
100 F TANT
AVX TPS
7
1580 TA01
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.
DESCRIPTION
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.
1.0
0.5
0
0
Dropout Regulator
INDICATES GUARANTEED TEST POINTS
0 C T
1
Minimum Power Voltage
U
Dropout Voltage —
J
OUTPUT CURRENT (A)
LT1580/LT1580-2.5
2
DATA SHEET LIMIT
125 C
3
7A, Very Low
T
J
4
= 25 C
5
T
J
= 125 C
6
1580 G03
7
1

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LT1580IQ#TRPBF Summary of contents

Page 1

... A small capacitor on the ADJ 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. 1.0 2.5V/7A ...

Page 2

LT1580/LT1580-2 ABSOLUTE MAXIMUM V Input Voltage ................................................ 6V POWER V Input Voltage ........................................... 13V CONTROL Storage Temperature ............................ – 150 C Operating Junction Temperature Range Control Section LT1580C ........................................... 125 C ...

Page 3

ELECTRICAL CHARACTERISTICS PARAMETER CONDITIONS Load Regulation: LT1580-2.5 V CONTROL LT1580 (V = 0V) V ADJ CONTROL Minimum Load Current: LT1580 V CONTROL Control Pin Current: LT1580-2.5 V CONTROL (Note 4) V CONTROL V CONTROL V CONTROL V CONTROL V CONTROL ...

Page 4

LT1580/LT1580-2.5 ELECTRICAL CHARACTERISTICS PARAMETER CONDITIONS Minimum V : LT1580-2.5 V POWER CONTROL (V – POWER OUT CONTROL V CONTROL V CONTROL V CONTROL V CONTROL V CONTROL Minimum V : LT1580 V POWER CONTROL (V – V ...

Page 5

W U TYPICAL PERFORMANCE CHARACTERISTICS LT1580 Reference Voltage vs Temperature 1.258 1.256 1.254 1.252 1.250 1.248 1.246 1.244 1.242 –50 – 100 125 150 TEMPERATURE ( C) 1580 G04 PIN FUNCTIONS (5-Lead/7-Lead) SENSE ...

Page 6

LT1580/LT1580-2.5 W BLOCK DIAGRA ADJ U U APPLICATIONS INFORMATION The LT1580 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 ...

Page 7

U U APPLICATIONS INFORMATION The LT1580 has improved frequency compensation which permits the use of capacitors with very low ESR. This is critical in addressing the needs of modern, low voltage, high speed microprocessors. Current generation micro- processors cycle load ...

Page 8

LT1580/LT1580-2 APPLICATIONS INFORMATION pin and the top of the resistor divider are connected to the top of the load. The bottom of the resistor divider is connected to the bottom of the load. R connected inside the regulating ...

Page 9

U U APPLICATIONS INFORMATION load current changes. Output capacitance can increase without limit and larger values of output capacitance further improve the stability and transient response of the LT1580. Modern microprocessors generate large high frequency current transients. The load current ...

Page 10

LT1580/LT1580-2 APPLICATIONS INFORMATION A protection diode between the V OUT pin is usually not needed. An internal diode between the V pin and the V pin on the LT1580 can handle OUT POWER microsecond surge currents of 50A ...

Page 11

... 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 ...

Page 12

LT1580/LT1580-2.5 U TYPICAL APPLICATION 5V 3. 25V 0.33 F RTN 12 2.5V/6A Regulator POWER CONT 1 SENSE LT1580 V = 2.5V 3 OUT V OUT ADJ 220 F ...

Page 13

PACKAGE DESCRIPTION 0.060 0.256 (1.524) (6.502) 0.060 0.183 (1.524) (4.648) 0.075 (1.905) 0.300 (7.620) BOTTOM VIEW OF DD PAK HATCHED AREA IS SOLDER PLATED COPPER HEAT SINK 0.060 0.256 (1.524) (6.502) 0.060 0.183 (1.524) (4.648) 0.075 (1.905) 0.300 (7.620) BOTTOM ...

Page 14

LT1580/LT1580-2.5 PACKAGE DESCRIPTION 0.390 – 0.415 (9.906 – 10.541) 0.460 – 0.500 (11.684 – 12.700) 0.057 – 0.077 0.028 – 0.038 (1.448 – 1.956) (0.711 – 0.965 Dimensions in inches (millimeters) unless otherwise noted. T Package 5-Lead Plastic ...

Page 15

... 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. U Dimensions in inches (millimeters) unless otherwise noted ...

Page 16

... Efficient High Current Microprocessor Supply >90% Efficiency with Fixed 5V, 3.3V or Adjustable Outputs >90% Efficient High Current Microprocessor Supply For High Performance Microprocessors For High Performance Microprocessors For High Performance Microprocessors 158025fas, sn158025 LT/GP 0598 2K REV A • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1995 ...

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