LP38851S-ADJ Datasheet, PDF (1/29 Pages) Texas Instruments – LP38851 800 mA Fast-Response High-Accuracy Adjustable LDO Linear Regulator with Enable and Soft-Start

LP38851
www.ti.com
SNVS492C – JUNE 2007 – REVISED APRIL 2013
LP38851 800 mA Fast-Response High-Accuracy Adjustable LDO Linear Regulator with
Enable and Soft-Start
Check for Samples: LP38851
FEATURES
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•2 Adjustable V_OUT Range of 0.80V to 1.8V
• Wide V_BIAS Supply Operating Range of 3.0V to
5.5V
• Stable with 10µF Ceramic Capacitors
• Dropout Voltage of 115 mV (Typical) at 800 mA
Load Current
• Precision V_ADJ across All Line and Load
Conditions:
– ±1.5% V_ADJ for T_J = 25°C
– ±2.0% V_ADJ for 0°C ≤ T_J ≤ +125°C
– ±3.0% V_ADJ for -40°C ≤ T_J ≤ +125°C
• Over-Temperature and Over-Current
Protection
• Available in 8-Lead SO PowerPad,
7-Lead SFM and 7-Lead PFM Packages
• −40°C to +125°C Operating Junction
Temperature Range
APPLICATIONS
• ASIC Power Supplies in:
– Desktops, Notebooks, and Graphics Cards,
Servers
– Gaming Set Top Boxes, Printers and
Copiers
• Server Core and I/O Supplies
• DSP and FPGA Power Supplies
• SMPS Post-Regulator
DESCRIPTION
The LP38851-ADJ is a high current, fast response
regulator which can maintain output voltage
regulation with extremely low input to output voltage
drop. Fabricated on a CMOS process, the device
operates from two input voltages: V_BIAS provides
voltage to drive the gate of the N-MOS power
transistor, while V_IN is the input voltage which
supplies power to the load. The use of an external
bias rail allows the part to operate from ultra low V_IN
voltages. Unlike bipolar regulators, the CMOS
architecture consumes extremely low quiescent
current at any output load current. The use of an N-
MOS power transistor results in wide bandwidth, yet
minimum external capacitance is required to maintain
loop stability.
The fast transient response of this device makes it
suitable for use in powering DSP, Microcontroller
Core voltages and Switch Mode Power Supply post
regulators. The part is available in PSOP 8–pin, SFM
7–pin, and TO-263 7-pin packages.
• Dropout Voltage: 115 mV (typical) at 800 mA
load current
• Low Ground Pin Current: 10 mA (typical) at 800
mA load current
• Soft-Start: Programmable Soft-Start time
• Precision ADJ Voltage: ±1.5% for T_J = 25°C,
and ±2.0% for 0°C ≤ T_J ≤ +125°C, across all line
and load conditions
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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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.
Copyright © 2007–2013, Texas Instruments Incorporated