LP38855_15 Datasheet, PDF (1/20 Pages) Texas Instruments – 1.5A Fast-Response High-Accuracy LDO Linear Regulator with Enable

LP38855
www.ti.com
SNVS461D – OCTOBER 2006 – REVISED APRIL 2013
1.5A Fast-Response High-Accuracy LDO Linear Regulator with Enable
Check for Samples: LP38855
FEATURES
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•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 10 µF Ceramic Capacitors
• Dropout Voltage of 130 mV (Typical) at 1.5A
Load Current
• Precision Output Voltage Across All Line and
Load Conditions:
– ±1.0% for T_J = 25°C
– ±2.0% for 0°C ≤ T_J ≤ +125°C
– ±3.0% 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 LP38855 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 LP38855 is available in TO-220 and
DDPAK/TO-263 5-Lead packages.
Dropout Voltage: 130 mV (typical) at 1.5A load
current.
Low Ground Pin Current: 10 mA (typical) at 1.5A
load current.
Shutdown Current: 1 µA (typical) I_IN(GND) when EN
pin is low.
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
V_EN
LP38855-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
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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