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LP38869_15

更新时间： 2024-11-15 01:05:19
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德州仪器 - TI /
页数 文件大小 规格书
23页 1161K
描述
1A FlexCap, Low-Dropout Linear Regulator with 0.75% Accuracy

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LP38869_15 数据手册

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LP38869  
www.ti.com  
SNVS877B –AUGUST 2012–REVISED APRIL 2013  
LP38869 1A FlexCap, Low-Dropout Linear Regulator with 0.75% Accuracy  
Check for Samples: LP38869  
1
FEATURES  
DESCRIPTION  
The LP38869 low-dropout linear regulator operates  
with an input voltage supply from +2.7V to +5.5V  
input, and delivers a specified 1A load current with a  
low 200 mV dropout. The high 50 dB PSRR at 100  
kHz results from a high gain control loop that also  
yields excellent transient response. Coupled with a  
2
•
•
•
Operating Input Supply Range: +2.7V to + 5.5V  
Maximum Continuous Output Current: 1A  
Preset Output Voltage of 2.5V, or Adjustable  
Output Voltage From 0.8V to 5.0V  
•
•
•
•
•
Pre-Set Output Initial VOUT Tolerance ±0.5%  
Adjustable VREF Tolerance of ±0.75%  
PSRR of 50dB at 100kHz  
high accuracy output voltage, ±0.75  
%
over  
temperature, the LP38869 is an ideal power supply  
for FPGAs, DSPs or MCUs. Output voltage is preset  
at +2.5V, or may be adjustable between +0.8V to +5V  
with an external resistor divider.  
Low 200 mV Dropout at 1A  
Typical 2 µA Supply Current in Shutdown  
Mode  
The LP38869 only needs 1 μF output capacitance for  
stability. The FlexCap compensation allows the use of  
any type of output capacitor, regardless of ESR.  
Other features include: Soft-Start; delayed reset  
output; low-power shutdown; short-circuit protection;  
and thermal shutdown protection  
•
•
•
Adjustable Soft-Start for Output Current  
Fold-Back Output Current Limit  
Stable With Ceramic, Tantalum, or Aluminum  
Capacitors  
•
•
•
Stable With 1uF Input/Output Capacitors  
Thermal Shutdown  
Ground Pin Current: Typically less than 1 mA at 1A  
load  
16-pin HTSSOP Package  
Shutdown Mode: Typically 2 µA quiescent current  
when the SHDN pin is pulled low.  
APPLICATIONS  
Simplified Compensation: Stable with any type of  
output capacitor.  
•
•
•
•
DSA, FPGA and MCU Power Supply  
SMPS Post-Regulator  
Applications Requiring Sequencing  
Gibabit SERDES Termination Supply  
Typical Application Circuit  
V
V
OUT  
IN  
IN  
IN  
OUT  
OUT  
OUT  
1 mF  
1 mF  
IN  
IN  
LP38869  
OUT  
RST  
SET  
GND  
RESET  
ON-  
OFF-  
SHDN  
SS  
DAP  
C
SS  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
All trademarks are the property of their respective owners.  
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 © 2012–2013, Texas Instruments Incorporated  
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