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LP2975

更新时间： 2024-11-24 02:58:39
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德州仪器 - TI /
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36页 2890K
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MOSFET LDO Driver/Controller

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LP2975 数据手册

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LP2975  
www.ti.com  
SNVS006F –SEPTEMBER 1997–REVISED APRIL 2013  
MOSFET LDO Driver/Controller  
Check for Samples: LP2975  
1
FEATURES  
DESCRIPTION  
A high-current LDO regulator is simple to design with  
the LP2975 LDO Controller. Using an external P-FET,  
the LP2975 will deliver an ultra low dropout regulator  
with extremely low quiescent current.  
2
•
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Simple to Use, Few External Components  
Ultra-small VSSOP-8 Package  
1.5% (A Grade) Precision Output Voltage  
Low-power Shutdown Input  
High open loop gain assures excellent regulation and  
ripple rejection performance.  
< 1 µA in Shutdown  
Low Operating Current (180 µA Typical @ VIN  
5V)  
=
The trimmed internal bandgap reference provides  
precise output voltage over the entire operating  
temperature range.  
•
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•
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Wide Supply Voltage Range (1.8V to 24V)  
Built-in Current Limit Amplifier  
Dropout voltage is “user selectable” by sizing the  
external FET: the minimum input-output voltage  
required for operation is the maximum load current  
multiplied by the RDS(ON) of the FET.  
Overtemperature Protection  
5.0V, and 3.3V Standard Output Voltages  
Can be Programmed Using External Divider  
Overcurrent protection of the external FET is easily  
implemented by placing a sense resistor in series  
with VIN. The 57 mV detection threshold of the current  
sense circuitry minimizes dropout voltage and power  
dissipation in the resistor.  
−40°C to +125°C Junction Temperature Range  
APPLICATIONS  
•
•
•
High-current 5V to 3.3V Regulator  
Post Regulator for Switching Converter  
Current-limited Switch  
The standard product versions available provide  
output voltages of 5.0V, or 3.3V with specified 25°C  
accuracy of 1.5% (“A” grade) and 2.5% (standard  
grade).  
Block Diagram  
*RSET values are: 208k for 12V part, 72.8k for 5V part, and 39.9k for 3.3V part.  
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 © 1997–2013, Texas Instruments Incorporated  
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