LP3872_15 Datasheet, PDF (1/28 Pages) Texas Instruments – LP387x 1.5-A Fast Ultra-Low-Dropout Linear Regulators

Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
LP3872, LP3875
SNVS227H – FEBRUARY 2003 – REVISED JANUARY 2015
LP387x 1.5-A Fast Ultra-Low-Dropout Linear Regulators
1 Features
•1 Input Voltage Range: 2.5 V to 7 V
• Ultra Low-Dropout Voltage
• Low Ground Pin Current
• Load Regulation of 0.06%
• 10-nA Quiescent Current in Shutdown Mode
• Ensured Output Current of 1.5-A DC
• Available in DDPAK/TO-263, TO-220, and
SOT-223 Packages
• Output Voltage Accuracy ± 1.5%
• ERROR Flag for Output Status
• Sense Option Improves Load Regulation
• Minimum Output Capacitor Requirements
• Overtemperature/Overcurrent Protection
• −40°C to 125°C Junction Temperature Range
2 Applications
• Microprocessor Power Supplies
• GTL, GTL+, BTL, and SSTL Bus Terminators
• Power Supplies for DSPs
• SCSI Terminators
• Post Regulators
• High Efficiency Linear Regulators
• Battery Chargers
• Other Battery-Powered Applications
space
space
space
space
space
LP3872 Typical Application Circuit
3 Description
The LP387x series of fast ultra low-dropout linear
regulators operate from a 2.5-V to 7-V input supply.
Wide range of preset output voltage options are
available. These ultra low-dropout linear regulators
respond very quickly to step changes in load, which
makes them suitable for low-voltage microprocessor
applications. The LP3872 and LP3875 are developed
on a CMOS process which allows low quiescent
current operation independent of output load current.
This CMOS process also allows the LP3872 and
LP3875 to operate under extremely low dropout
conditions.
Dropout Voltage: Ultra low-dropout voltage; typically
38 mV at 150-mA load current and 380 mV at 1.5-A
load current.
Ground Pin Current: Typically 6 mA at 1.5-A load
current.
Shutdown Mode: Typically 10-nA quiescent current
when the SD pin is pulled low.
ERROR Flag: ERROR flag goes low when the output
voltage drops 10% below nominal value (LP3872
only).
SENSE: Sense pin improves regulation at remote
loads (LP3875 only).
Precision Output Voltage: Multiple output voltage
options are available ranging from 1.8 V to 5 V with a
specified accuracy of ±1.5% at room temperature,
and ±3.0% over all conditions (varying line, load, and
temperature).
Device Information⁽¹⁾
PART NUMBER PACKAGE
BODY SIZE (NOM)
LP3872
SOT-223 (5)
TO-263 (5)
6.50 mm × 3.56 mm
10.16 mm × 8.42 mm
SOT-223 (5)
6.50 mm × 3.56 mm
LP3875
TO-263 (5)
10.16 mm × 8.42 mm
TO-220 (5)
14.986 mm × 10.16 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
*SD and ERROR pins must be pulled high
through a 10-kΩ pullup resistor. Connect
the ERROR pin to ground if this function is
not used. See the Shutdown Mode and
ERROR Flag Operation sections.
LP3875 Typical Application Circuit
*SD must be pulled high through a 10-kΩ
pullup resistor. See the Shutdown Mode
section.
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.