TL499ACPSR Integrated Circuits (ICs)

Voltage - Output (Min/Fixed):	2.9V
Base Part Number:	TL499
Supplier Device Package:	8-SO
Package / Case:	8-SOIC (0.209", 5.30mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-20°C ~ 85°C (TA)
Synchronous Rectifier:	No
Frequency - Switching:	--
Current - Output:	1A (Switch)
Voltage - Output (Max):	30V
Series:	--
Voltage - Input (Max):	10V
Voltage - Input (Min):	1V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Boost
Output Configuration:	Positive
Function:	Step-Up
Part Status:	Active
Packaging:	Tape & Reel (TR)

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TL499ACPSR Application Field and Working Principle

The TL499ACPSR is a monolithic DC-to-DC switching regulator specifically designed for medical and industrial applications such as implantable or other medical devices and hightemperature and low-power industrial equipment. It is part of the line up of DC-DC switching regulators from Texas Instruments that can provide a broad variety of output voltages and currents for today\'s high-performance, space-saving and energy-efficient designs.

Features

The TL499ACPSR is a switchmode, monolithic DC-to-DC converter that has two integrated synchronous rectification MOSFETs. This device allows control of the output voltage from 0.6 V to 3.0 V. The PWM and pulse-by-pulse current-limit circuitry easily allows design optimization. The current limit is adjustable over a wide range such as 0.1 to 2.0 A with a single resistor.The TL499ACPSR features an adjustable LVCVS current-limit feature to accurately adjust the current limit over a wide range. This feature ensures the safety of your system. The device also features a thermal shutdown circuit for over-temperature protection.

Applications

The TL499ACPSR is ideal for applications such as:- Implantable medical devices.- Low-power military and avionics systems.- Industrial equipment and instrumentation.- Battery-operated medical and industrial equipment.- Automotive and telecommunication systems.

Working Principle

The TL499ACPSR is a synchronous DC-to-DC conversion with two permanent magnet synchronous rectifier MOSFETs. The power MOSFETs can deliver up to 5 A of continuous current. The device can be configured to work as a step-up, step-down, or inverting converter. The two synchronous rectifier MOSFETs are driven by a 150 kHz oscillator to produce up to 3 A of output current over a wide input voltage range. The device senses the voltage level at the output of the device and adjusts the duty cycle of the power MOSFETs accordingly to maintain the desired output voltage.An internal voltage regulated pulse-by-pulse current limiter monitors the output current and adjusts the duty cycle of the power MOSFETs to limit the output current. The current limit point can be adjusted over a wide range with a single resistor.The device features a low-voltage controlled current source (LVCVS) to set the high-side MOSFET current during switching. The LVCVS is adjustable over a wide range with a single resistor and allows designers to optimize efficiency and reduce EMI.

Conclusion

The TL499ACPSR is a high-performance DC-to-DC switching regulator suitable for medical and industrial applications. The device offers step-up, step-down, and inverting mode conversions with adjustable output voltage and current limiting. The integrated synchronous rectifier MOSFETs and the adjustable current limit allow performance optimization and increased efficiency. The TL499ACPSR also offers protection features such as thermal shutdown and robust transient protection for improved system reliability.

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