LP38859_15 Datasheet, PDF (1/25 Pages) Texas Instruments – 3A Fast-Response High-Accuracy LDO Linear Regulator With Soft Start

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LP38859
SNVS337F – JUNE 2006 – REVISED SEPTEMBER 2015
LP38859 3-A Fast-Response High-Accuracy LDO Linear Regulator With Soft Start
1 Features
•1 Input Voltage: 1.1 V to 5.5 V
• Wide V_BIAS Supply Operating Range: 3 V to 5.5 V
• Standard V_OUT Values: 0.8 V and 1.2 V
• Stable With 10-µF Ceramic Capacitors
• Dropout Voltage of 240 mV (typical) at 3-A Load
Current
• Programmable Soft-Start Time
• Precision Output Voltage Across All Line and
Load Conditions:
– ±1% V_OUT for T_J = 25°C
– ±2% V_OUT for 0°C ≤ T_J ≤ +125°C
– ±3% V_OUT for –40°C ≤ T_J ≤ +125°C
• Overtemperature and Overcurrent Protection
• Operating Temperature Range: −40°C to +125°C
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 LP38859 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 LP38859 is available in 5-pin TO-220
and DDPAK/TO-263 packages.
PART
NUMBER
LP38859
Device Information⁽¹⁾
PACKAGE
BODY SIZE (NOM)
DDPAK/TO-263 (5) 10.16 mm × 8.42 mm
TO-220 (5)
14.986 mm × 10.16 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Circuit
V_IN
V_BIAS
GND
C_IN
10 2F Ceramic
C_BIAS
1 2F
LP38859-x.x
IN
OUT
BIAS
SS
GND
C_SS
V_OUT
C_OUT
10 2F
Ceramic
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.