LP3853ET-33 Datasheet, PDF (1/25 Pages) Texas Instruments – LP3853/LP3856 3A Fast Response Ultra Low Dropout Linear Regulators

LP3853, LP3856
www.ti.com
SNVS173G – FEBRUARY 2003 – REVISED APRIL 2013
LP3853/LP3856 3A Fast Response Ultra Low Dropout Linear Regulators
Check for Samples: LP3853, LP3856
FEATURES
1
•2 Ultra Low Dropout Voltage
• Stable with Selected Ceramic Capacitors
• Low Ground Pin Current
• Load Regulation of 0.08%
• 10nA Quiescent Current in Shutdown Mode
• Ensured Output Current of 3A DC
• Available in TO-263 and TO-220 Packages
• Output Voltage Accuracy ± 1.5%
• Error Flag Indicates Output Status
• Sense Option Improves Load Regulation
• Overtemperature/overcurrent Protection
• −40°C to +125°C Junction Temperature Range
APPLICATIONS
• Microprocessor Power Supplies
• Stable with Ceramic Output Capacitors
• 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
DESCRIPTION
The LP3853/LP3856 series of fast ultra low-dropout
linear regulators operate from a +2.5V to +7.0V 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 LP3853/LP3856 are
developed on a CMOS process which allows low
quiescent current operation independent of output
load current. This CMOS process also allows the
LP3853/LP3856 to operate under extremely low
dropout conditions.
Dropout Voltage: Ultra low dropout voltage; typically
39mV at 300mA load current and 390mV at 3A load
current.
Ground Pin Current: Typically 4mA at 3A load
current.
Shutdown Mode: Typically 10nA quiescent current
when the shutdown pin is pulled low.
Error Flag:Error flag goes low when the output
voltage drops 10% below nominal value.
SENSE: Sense pin improves regulation at remote
loads.
Precision Output Voltage: Multiple output voltage
options are available ranging from 1.8V to 5.0V with a
ensured accuracy of ±1.5% at room temperature, and
±3.0% over all conditions (varying line, load, and
temperature).
Typical Application Circuits
INPUT
3.3V ± 10%
C_IN*
10 PF
SD**
V_IN
V_OUT
LP3853-1.8
SD
ERROR
GND
ERROR**
V_OUT
1.8V, 3.0A
C_OUT*
10 PF
* TANTALUM OR
CERAMIC
**SD and ERROR pins must be pulled high through a 10kΩ pull-up resistor. Connect the ERROR pin to ground if this
function is not used. See Application Hints for more information.
INPUT
3.3V ± 10%
C_IN*
10 PF
SD**
V_IN
V_OUT
LP3856-1.8
SD
SENSE
GND
V_OUT
1.8V, 3.0A
C_OUT*
10 PF
* TANTALUM OR
CERAMIC
**SD pin must be pulled high through a 10kΩ pull-up resistor. See Application Hints for more information.
1
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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