LP38858
www.ti.com
SNVS462D –OCTOBER 2006–REVISED APRIL 2013
1.5A Fast-Response High-Accuracy LDO Linear Regulator with Soft-Start
Check for Samples: LP38858
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FEATURES
DESCRIPTION
The LP38858 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: VBIAS provides
voltage to drive the gate of the N-MOS power
transistor, while VIN 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 VIN
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.
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Standard VOUT Values of 0.8V and 1.2V
Wide VBIAS Supply Operating Range of 3.0V to
5.5V
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Stable with 10µF Ceramic Capacitors
Dropout Voltage of 130 mV (Typical) at 1.5A
Load Current
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Precision Output Voltage across All Line and
Load Conditions:
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–
–
±1.0% VOUT for TJ = 25°C
±2.0% VOUT for 0°C ≤ TJ ≤ +125°C
±3.0% VOUT for -40°C ≤ TJ ≤ +125°C
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Over-Temperature and Over-Current
Protection
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 LP38858 is available in TO-220 and
DDPAK/TO-263 5-Lead packages.
Available in 5 Lead TO-220 and DDPAK/TO-263
Packages
Custom VOUT Values between 0.8V and 1.2V
are Available
Dropout Voltage: 130mV (typical) at 1.5A load
current.
−40°C to +125°C Operating Temperature Range
APPLICATIONS
Low Ground Pin Current: 10 mA (typical) at 1.5A
load current.
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ASIC Power Supplies In:
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Desktops, Notebooks, and Graphics Cards,
Servers
Soft-Start: Programmable Soft-Start time.
Precision Output Voltage: ±1.0% for TJ = 25°C and
±2.0% for 0°C ≤ TJ ≤ +125°C, across all line and load
conditions
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Gaming Set Top Boxes, Printers and
Copiers
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Server Core and I/O Supplies
DSP and FPGA Power Supplies
SMPS Post-Regulator
Typical Application Circuit
LP38858-x.x
V
IN
V
OUT
IN
OUT
C
IN
10 mF Ceramic
V
BIAS
BIAS
SS
C
BIAS
C
OUT
1 mF
10 mF
Ceramic
GND
C
SS
GND
GND
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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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