LT1529IQ#TRPBF

Current - Output:	3A
Base Part Number:	LT1529
Supplier Device Package:	5-DDPAK
Package / Case:	TO-263-6, D²Pak (5 Leads + Tab), TO-263BA
Mounting Type:	Surface Mount
Operating Temperature:	-45°C ~ 125°C
Protection Features:	Over Current, Over Temperature, Reverse Polarity
Control Features:	Enable
PSRR:	62dB (120Hz)
Current - Supply (Max):	160mA
Current - Quiescent (Iq):	100µA
Series:	--
Voltage Dropout (Max):	0.95V @ 3A
Voltage - Output (Max):	14V
Voltage - Output (Min/Fixed):	3.75V
Voltage - Input (Max):	15V
Number of Regulators:	1
Output Type:	Adjustable
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The LT1529IQ#TRPBF is a low-dropout (LDO) linear voltage regulator developed by Linear Technology. The LT1529 presents outstanding performance even in light load operation and has many features like extremely low dropout voltage and very low noise operation. Most of its features make it ideal for use in many battery powered applications because of its power saving capabilities.

Applications

The LT1529IQ#TRPBF is ideal for battery powered applications such as:

• Wireless communication devices
• Portable medical instruments
• Handheld radio devices
• Personal digital assistants (PDAs)
• MP3 players
• Portable computers
• ZigBee® radio applications
• – Wi-Fi radio applications

The LT1529IQ#TRPBF has an extremely low dropout voltage (Vdrop) of 100 mV maximum, as well as an extremely low ground current (<700 uA) and low noise outputs which makes it ideal for battery operated systems. It is also integrated with multiple functions such as shutdown, logic input voltage monitoring and output voltage monitoring.

Features

The LT1529IQ#TRPBF offers a wide range of features including:

• Very low Vdrop of 100 mV at full load and 20 mV at light load
• Wide input voltage range of 2.7V to 16V
• Output voltage adjustable down to 0.5V
• Supports 0.5A output currents
• Shutdown Logic input with automatic turn-on
• High power-saving in light load operation
• Very Low ground current of 700 uA
• Excellent thermal output performance
• Low output noise
• Accurate output voltage

Working Principle

The LT1529IQ#TRPBF is a low dropout voltage regulator which provides high power conversion efficiency of up to 93%. It works by using a P-channel MOSFET to regulate the output voltage.The P-channel MOSFET is controlled by a voltage reference voltage and a voltage divider formed from external resistors. When the voltage at the voltage divider is lower than the reference voltage, a P-channel MOSFET is turned on, allowing current to flow from the input voltage to the output voltage. The amount of current that flows depends on the resistance of the voltage divider and the reference voltage. The greater the resistance, the less current that will flow.The P-channel MOSFET can also be shut off by an input shutdown logic pin. This pin allows the user to turn off the P-channel MOSFET, preventing current flow and thus shutting down the regulator. The logic pin can also be used to detect when the input voltage is too low or too high, or when the output voltage is too high or too low.

Conclusion

The LT1529IQ#TRPBF is a low-dropout (LDO) linear voltage regulator developed by Linear Technology. It is ideal for battery powered applications like wireless communication devices and portable medical instruments because of its low dropout voltage, very low noise outputs, and high power saving capability. It also offers a wide range of features such as adjustable output voltage, shutdown logic input, accurate output voltage, and low output noise. The working principle is based on a P-channel MOSFET which is controlled by a voltage reference voltage and a voltage divider formed from external resistors.

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