LM73605QRNPRQ1

Voltage - Input (Max):	36V
Supplier Device Package:	30-WQFN (6x4)
Package / Case:	30-WFQFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	Yes
Frequency - Switching:	350kHz ~ 2.2MHz
Current - Output:	5A
Voltage - Output (Max):	34.2V
Voltage - Output (Min/Fixed):	1V
Series:	Automotive, AEC-Q100
Voltage - Input (Min):	3.5V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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LM73605QRNPRQ1 Application Field and Working Principle

The LM73605QRNPRQ1 is a step-down switching regulator from Texas Instruments. It belongs to the Texas Instruments\' PMIC family of DC-DC voltage regulators and is part of the DC-DC switching regulators portfolio. The voltage regulator is designed to provide maximum flexibility and to ensure stable power supply in demanding applications. It is suitable for point-of-load (PoL) or point-of-use (PoU) supplies.

Key Features and Benefits

The LM73605QRNPRQ1 is a highly efficient two-phase step-down switching regulator with a wide range of output voltages (from 0.8 V to 2.6 V) and an adjustable switch frequency (from 500 kHz to 1.5 MHz). It supports current inrush protection and utilizes an adaptive gate driver with an overvoltage protection of +/- 20V. It also features adjustable soft-start and voltage tracking for smoother operation. The device is available in a small 16-pin WQFN package.

Applications

The LM73605QRNPRQ1 is suitable for a variety of applications including power management in mobile phones, personal digital assistants (PDAs), digital cameras, audio equipment, game consoles and industrial/medical electronic equipment. It is particularly well suited for applications that require high efficiency and low noise operation.

Working Principle

The LM73605QRNPRQ1 is a two-phase, synchronous, step-down switching voltage regulator. Its basic operation revolves around two distinct stages. The first stage is the pre-regulation stage. This stage is designed to prepare the input voltage and transfer it over to the output stage. In this stage, the input voltage is diode-rectified and then it is transferred to the controller IC through the regulation loop. The regulation loop consists of a frequency compensation block, a voltage reference, an error amp and a current-sense amplifier. The voltage reference produces a reference voltage for the error amp. The error amp, in turn, compares the input voltage to the output voltage, and produces an error signal. The current-sense amplifier detects the current flow through the load and supplies information about the current draw to the controller IC. The second stage of the LM73605QRNPRQ1 is the post-regulation stage. In this stage, the controller IC energizes the external MOSFETs and works as a PWM current source. The MOSFETs then transfer the input voltage to the output voltage. The switching frequency of the controller IC is adjustable, allowing the user to choose the most suitable settings for the application. The LM73605QRNPRQ1 is designed with a wide range of operating conditions in mind. The voltage regulator is capable of operating at output currents of up to 10A, and can accept input voltages of up to 36V. It provides excellent efficiency (up to 98%) and supports current-mode operation as well as PWM and constant frequency control modes. The device is also able to handle transient voltage and current conditions with ease. In summary, the LM73605QRNPRQ1 is a highly efficient two-phase switching voltage regulator from Texas Instruments. It belongs to the PMIC family of DC-DC voltage regulators and is part of the DC-DC switching regulators portfolio. It provides wide range of output voltages and excellent efficiency, making it suitable for a variety of applications in the mobile, consumer and industrial markets.

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