LP38858_15 Datasheet, PDF (1/21 Pages) Texas Instruments – 1.5A Fast-Response High-Accuracy LDO Linear Regulator with Soft-Start

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
FEATURES
1
•2 Standard V_OUT Values of 0.8V and 1.2V
• Wide V_BIAS Supply Operating Range of 3.0V to
5.5V
• Stable with 10µF Ceramic Capacitors
• Dropout Voltage of 130 mV (Typical) at 1.5A
Load Current
• Precision Output Voltage across All Line and
Load Conditions:
– ±1.0% V_OUT for T_J = 25°C
– ±2.0% V_OUT for 0°C ≤ T_J ≤ +125°C
– ±3.0% V_OUT for -40°C ≤ T_J ≤ +125°C
• Over-Temperature and Over-Current
Protection
• Available in 5 Lead TO-220 and DDPAK/TO-263
Packages
• Custom V_OUT Values between 0.8V and 1.2V
are Available
• −40°C to +125°C Operating 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 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: 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 LP38858 is available in TO-220 and
DDPAK/TO-263 5-Lead packages.
Dropout Voltage: 130mV (typical) at 1.5A load
current.
Low Ground Pin Current: 10 mA (typical) at 1.5A
load current.
Soft-Start: Programmable Soft-Start time.
Precision Output Voltage: ±1.0% for T_J = 25°C and
±2.0% for 0°C ≤ T_J ≤ +125°C, across all line and load
conditions
Typical Application Circuit
V_IN
V_BIAS
GND
C_IN
10 PF Ceramic
C_BIAS
1 PF
LP38858-x.x
IN
OUT
BIAS
SS
GND
C_SS
V_OUT
C_OUT
10 PF
Ceramic
GND
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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 © 2006–2013, Texas Instruments Incorporated