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LP38856_15

更新时间： 2024-11-15 01:05:59
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德州仪器 - TI /
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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  
3 Description  
The LP38856 is  
a
high-current, fast-response  
1
•
Input Voltage: 1.1 V to 5.5 V  
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: VBIAS  
provides power for the internal bias and control  
circuits, as well as drive for the gate of the N-MOS  
power transistor, while VIN supplies power to the load.  
The use of an external bias rail allows the part to  
operate from ultra-low VIN 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.  
•
•
•
•
Wide VBIAS Supply Operating Range: 3 V to 5.5 V  
Standard VOUT: 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 TJ = 25°C  
±2% for 0°C ≤ TJ ≤ +125°C  
±3% for –40°C ≤ TJ ≤ +125°C  
•
•
Overtemperature and Overcurrent Protection  
–40°C to +125°C Operating Temperature Range  
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.  
2 Applications  
•
ASIC Power Supplies In:  
–
Desktops, Notebooks, and Graphics Cards,  
Servers  
•
•
•
•
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) IIN(GND) when EN  
pin is low.  
Precision Output Voltage: ±1% for TJ = 25°C and  
±2% for 0°C ≤ TJ ≤ +125°C, across all line and  
load conditions.  
–
Gaming Set Top Boxes, Printers and Copiers  
•
•
•
Server Core and I/O Supplies  
DSP and FPGA Power Supplies  
SMPS Post-Regulator  
Device Information(1)  
PART NUMBER  
LP38856  
PACKAGE  
DDPAK/TO-263 (5)  
TO-220 (5)  
BODY SIZE (NOM)  
10.16 mm × 8.42 mm  
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  
LP38856-x.x  
V
IN  
V
OUT  
IN  
OUT  
C
IN  
10 mF Ceramic  
V
BIAS  
BIAS  
EN  
C
BIAS  
C
OUT  
1 mF  
10 mF  
Ceramic  
V
EN  
GND  
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.  
 
 
 
 
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