LP3852_15 Datasheet, PDF (1/32 Pages) Texas Instruments – 1.5-A Fast Response Ultra-Low Dropout Linear Regulators

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LP3852, LP3855
SNVS174I – FEBRUARY 2003 – REVISED FEBRUARY 2015
LP385x 1.5-A Fast Response Ultra-Low Dropout Linear Regulators
1 Features
•1 Input Supply Voltage: 2.5 V to 7 V
• Ultra-Low Dropout Voltage
• Stable with Selected Ceramic Capacitors
• Low Ground-Pin Current
• Load Regulation of 0.06%
• 10-nA Quiescent Current in Shutdown Mode
• Specified Output Current of 1.5 A DC
• Output Voltage Accuracy ± 1.5%
• ERROR Pin Indicates Output Status
• SENSE Option Improves Load Regulation
• 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 Terminator
• Post Regulators
• High Efficiency Linear Regulators
• Battery Chargers
• Other Battery Powered Applications
3 Description
The LP3852 and LP3855 series of fast ultra-low
dropout linear regulators operate from a 2.5-V to 7-V
input supply. A 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 LP3852 and
LP3855 are developed on a CMOS process which
allows low quiescent-current operation independent
of output load current, typically 4 mA at 1.5-A load
current. This CMOS process also allows the LP3852
and LP3855 to operate under extremely low dropout
conditions, typically 24 mV at 150-mA load current
and 240 mV at 1.5-A load current.
The LP3852 has an ERROR pin; it goes low when
the output voltage drops 10% below nominal value.
The LP3855 has a SENSE pin to improves regulation
at remote loads.
The LP3852 and LP3855 are available with fixed
output voltages from 1.8 V to 5 V with a specified
accuracy of ±1.5% at room temperature, and ±3%
over all conditions (varying line, load, and
temperature). Contact Texas Instruments Sales for
specific voltage option needs.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LP3852
LP3855
SOT (5)
TO-263 (5)
TO-220 (5)
6.50 mm x 3.56 mm
10.16 mm x 8.42 mm
14.986 mm x 10.16 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
4 Simplified Schematics
INPUT
3.3V ± 10%
C_IN*
10 2F
SD**
IN
OUT
LP3852-2.5
SD
ERROR
GND
ERROR**
V_OUT
2.5V, 1.5A
C_OUT*
10 2F
* TANTALUM OR CERAMIC
**SD and ERROR pins must be pulled high through a 10-kΩ pull-up resistor. Connect the ERROR pin to ground if this
function is not used.
INPUT
3.3V ± 10%
C_IN*
10 2F
SD**
IN
OUT
LP3855-2.5
SD
SENSE
GND
V_OUT
2.5V, 1.5A
C_OUT*
10 2F
* TANTALUM OR CERAMIC
**SD must be pulled high through a 10-kΩ pull-up resistor.
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.