LP38852S-ADJ Datasheet, PDF (1/29 Pages) Texas Instruments – 1.5A Fast-Response High-Accuracy Adjustable LDO Linear Regulator with Enable and Soft-Start

LP38852
www.ti.com
SNVS482E – JANUARY 2007 – REVISED APRIL 2013
1.5A Fast-Response High-Accuracy Adjustable LDO Linear Regulator with Enable and
Soft-Start
Check for Samples: LP38852
FEATURES
1
•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 130 mV (Typical) at 1.5A
Load Current
• Precision Output Voltage 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 TO-
220 and 7 Lead DDPAK 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 LP38852-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 the TO-220 and
DDPAK 7-pin packages.
Dropout Voltage: 130 mV (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 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
Typical Application Circuit
V_IN
V_BIAS
V_EN
GND
C_IN
10 PF Ceramic
C_BIAS
1 PF
LP38852-ADJ
IN
OUT
BIAS
ADJ
EN
SS
C_SS
GND
V_OUT
C_FF
R1
C_OUT
10 PF
Ceramic
R2
GND
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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