LINEAR TECHNOLOGY LT1580 LT1580-2.5 Specifications User Guide
Summary
Linear Technology LT1580 7A low dropout regulator with 100mV dropout at light loads and 540mV at 7A for microprocessor power. Features remote sense pin, fast transient response, fixed 2.5V and adjustable output, dual supply mode. Applications include Pentium/PowerPC motherboard VRMs and post-regulators. For power electronics engineers and motherboard designers.
Page 1 Text Content
LT1580/LT1580-2.5 7A, Very Low Dropout Regulator
FEATURES DESCRIPTION
Low Dropout, 540m V at 7A Output Current The LT ®1580 is a 7A low dropout regulator designed to Fast Transient Response power the new generation of microprocessors. The drop- Remote Sense out voltage of this device is 100m V at light loads rising to
1m V Load Regulation just 540m V at 7A. To achieve this dropout, a second low Fixed 2.5V Output and Adjustable Output current input voltage 1V greater than the output voltage, is No Supply Sequencing Problems in required. The device can also be used as a single supply Dual Supply Mode device where dropout is comparable to an LT1584. Several other new features have been added to the LT1580. APPLICATIONS A remote SENSE pin is brought out. This feature virtually eliminates output voltage variations due to load changes.
Microprocessor Supplies
Typical load regulation, measured at the SENSE pin, for a
Post Regulators for Switching Supplies
load current step of 100m A to 7A is less than 1m V.
High Current Regulators
IN IM UM OW ER OL TA GE (V The LT1580 has fast transient response, equal to the
5V to 3.XXV for Pentium® Processors Operating
at 90MHz to 166MHz and Beyond LT1584. On fixed voltage devices, the ADJ pin is brought 3.3V to 2.9V for Portable Pentium Processor out. A small capacitor on the ADJ pin further improves Power PCTM Series Power Supplies 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. Power PC is a trademark of IBM Corporation.
TYPICAL APPLICATION
Dropout Voltage— Minimum Power Voltage
2.5V Microprocessor Supply
1.0 INDICATES GUARANTEED TEST POINTS 2.5V/7A 0°C ≤ TJ ≤ 125°C
VPOWER VOUT
330µF 100µF TANT
DATA SHEET LIMIT
OS-CON AVX TPS
LT1580-2.5 × 7
5V TJ = 125°C
VCONTROL SENSE
TJ = 25°C
ADJGND
10µF TANT
0.1µF 1580 TA01
OUTPUT CURRENT (A)
Page Summary Contents For LINEAR TECHNOLOGY LT1580 LT1580-2.5 Specifications User Guide
Manual Details
| Brand | Linear |
|---|---|
| Pages | 16 |
| File Size | 234.03 KB |
| Published | June 15, 2026 |
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Frequently Asked Questions
What is the dropout voltage of the LT1580 at full 7A load?
The dropout voltage is 540mV when delivering 7A of output current.
What is the output voltage range of the fixed LT1580-2.5?
The fixed output is 2.5V, with a tolerance of ±1% over temperature and load.
Can the LT1580 be used with a single supply?
Yes, it works as a single supply device with dropout comparable to the LT1584.