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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
3 Description
The LP3852 and LP3855 series of fast ultra-low
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Input Supply Voltage: 2.5 V to 7 V
Ultra-Low Dropout Voltage
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.
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
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.
2 Applications
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Microprocessor Power Supplies
GTL, GTL+, BTL, and SSTL Bus Terminators
Power Supplies for DSPs
SCSI Terminator
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.
Post Regulators
High Efficiency Linear Regulators
Battery Chargers
Device Information(1)
Other Battery Powered Applications
PART NUMBER
PACKAGE
BODY SIZE (NOM)
6.50 mm x 3.56 mm
10.16 mm x 8.42 mm
14.986 mm x 10.16 mm
SOT (5)
LP3852
LP3855
TO-263 (5)
TO-220 (5)
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
4 Simplified Schematics
V
INPUT
3.3V ± 10%
OUT
IN
OUT
2.5V, 1.5A
C
*
C *
OUT
IN
10 PF
LP3852-2.5
10 PF
SD
ERROR
GND
ERROR**
SD**
* 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.
V
INPUT
3.3V ± 10%
OUT
2.5V, 1.5A
OUT
IN
C
*
C *
OUT
IN
10 PF
LP3855-2.5
10 PF
SENSE
GND
SD
SD**
* TANTALUM OR CERAMIC
**SD must be pulled high through a 10-kΩ pull-up resistor.
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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.