LP38856_15 Datasheet, PDF (1/24 Pages) Texas Instruments – 3A Fast-Response High-Accuracy LDO Linear Regulator With Enable

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LP38856
SNVS336F – JUNE 2006 – REVISED AUGUST 2015
LP38856 3-A Fast-Response High-Accuracy LDO Linear Regulator With Enable
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: 0.8 V and 1.2 V
• Stable with 10-µF Ceramic Capacitors
• Dropout Voltage of 240 mV (Typical) at 3-A Load
Current
• Precision Output Voltage Across All Line and
Load Conditions:
– ±1% for T_J = 25°C
– ±2% for 0°C ≤ T_J ≤ +125°C
– ±3% for –40°C ≤ T_J ≤ +125°C
• Overtemperature and Overcurrent Protection
• –40°C to +125°C Operating Temperature Range
2 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
3 Description
The LP38856 is a high-current, fast-response
regulator which can maintain output voltage
regulation with an extremely low input-to-output
voltage drop. Fabricated on a CMOS process, the
device operates from two input voltages: V_BIAS
provides power for the internal bias and control
circuits, as well as drive for the gate of the N-MOS
power transistor, while V_IN 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 LP38856 is available in 5-pin TO-220
and DDPAK/TO-263 packages.
• Dropout Voltage: 240 mV (typical) at 3-A load
current.
• Low Ground Pin Current: 10 mA (typical) at 3-A
load current.
• Shutdown Current: 1 µA (typical) I_IN(GND) when EN
pin is low.
• Precision Output Voltage: ±1% for T_J = 25°C and
±2% for 0°C ≤ T_J ≤ +125°C, across all line and
load conditions.
PART NUMBER
LP38856
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
V_EN
LP38856-x.x
C_IN
10 PF Ceramic
C_BIAS
1 PF
IN
BIAS
EN
OUT
GND
V_OUT
C_OUT
10 PF
Ceramic
GND
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.