LP38853_15 Datasheet, PDF (1/30 Pages) Texas Instruments – LP38853 3A Fast-Response High-Accuracy Adjustable LDO Linear Regulator with Enable and Soft-Start

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LP38853
SNVS335E – DECEMBER 2006 – REVISED NOVEMBER 2015
LP38853 3-A Fast-Response High-Accuracy Adjustable LDO Linear Regulator With Enable
and Soft Start
1 Features
•1 Wide V_BIAS Supply Operating Range: 3 V to 5.5 V
• Adjustable V_OUT Range: 0.8 V to 1.8 V
• Dropout Voltage of 240 mV (Typical) at 3-A Load
Current
• Precision V_ADJ Across All Line and Load
Conditions:
– ±1.5% V_ADJ for T_J = 25°C
– ±2% V_ADJ for 0°C ≤ T_J ≤ +125°C
– ±3% V_ADJ for –40°C ≤ T_J ≤ +125°C
• Overtemperature and Overcurrent Protection
• Stable with 10-µF Ceramic Capacitors
• −40°C to +125°C Operating Junction Temperature
Range
2 Applications
• ASIC Power Supplies in:
– Desktops, Notebooks, Graphics Cards, and
Servers
– Gaming Set-Top Boxes, Printers, and Copiers
• Server Core and I/O Supplies
• DSP and FPGA Power Supplies
• SMPS Post-Regulator
3 Description
The LP38853 is a high-current, fast-response
regulator that 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 NMOS power transistor; V_IN is
the input voltage which supplies power to the load.
The use of an external bias rail allows the device 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 NMOS 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 and microcontroller
core voltages, and switch-mode power-supply post
regulators.
• Dropout Voltage: 240 mV (typical) at 3-A load
current.
• Low Ground Pin Current: 10 mA (typical) at 3-A
load current.
• Soft Start: Programmable soft-start time.
PART
NUMBER
LP38853
Device Information⁽¹⁾
PACKAGE
BODY SIZE (NOM)
DDPAK/TO-263 (7)
TO-220 (7)
SO PowerPAD™ (8)
10.10 mm × 8.89 mm
14.986 × 10.16 mm
4.89 mm × 3.90 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
VIN
VBIAS
VEN
GND
CIN
CBIAS
LP38853
IN
OUT
BIAS
EN
ADJ
SS
CSS
GND
CFF R1
VOUT
COUT
R2
GND
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.