TL497ACDR Integrated Circuits (ICs)

Voltage - Output (Min/Fixed):	±1.2V
Base Part Number:	TL497
Supplier Device Package:	14-SOIC
Package / Case:	14-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 70°C (TA)
Synchronous Rectifier:	No
Frequency - Switching:	--
Current - Output:	500mA (Switch)
Voltage - Output (Max):	30V, -25V
Series:	--
Voltage - Input (Max):	12V
Voltage - Input (Min):	4.5V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck, Boost
Output Configuration:	Positive or Negative
Function:	Step-Up, Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Background

TL497ACDR, which belongs to the family of PMIC (Power Management ICs), is a voltage regulator that is specifically designated as a DC-DC switching regulator. In other words, this voltage regulator primarily has the capability to reduce the input voltage that is applied to the regulator, and then output a stable voltage, which is usually lower than the input voltage.

Application Field

TL497ACDR is mainly used in different electronic applications where a lower and stable input voltage is required. To be more specific, these applications mainly include PCs and notebook computers, mobile phones and PDA, digital audio players, flat panel displays, single board computers, automotive, and even aviation systems.

Working Principle

In order to understand the basic operation principle of TL497ACDR, it is necessary to first state that the highest input voltage into this regulator can be as high as 70V, while the output voltage can as low as 2.85V. This device also features an adjustable switching frequency, where the typical range is between 100kHz to 1MHz. So, how does the regulator work to achieve such performance?The TL497ACDR is basically a two-stage design, consisting of a voltage-error amplifier and a PWM (power-wise modulation) circuit. Therefore, firstly, the voltage-error amplifier is used to detect the difference of the input and the output voltages, and then use this error signal to control the PWM circuit in order to vary the duty cycle of the pulse signal and regulate the output voltage. What is more, TL497ACDR also includes some other key building blocks for extra convenience and performance. For example, a current sense amplifier is integrated in the device, helping to vary the level of the reference current. This reference current is then used by a PWM comparator in the integrated PWM-control circuit, in order to generate accurate error signals for controlling the output voltage. In addition, the TL497ACDR also contains a soft-start capability, which is realized through a capacitor connected externally. This prevents inrush current when the device is first powered with the input voltage, as the output voltage slowly ramps up.Finally, depending on the version, the TL497ACDR can also be switched between different operating modes either by controlling the shutdown pin or by controlling the gain-select pin. This is a very useful feature, allowing user to switch between different power-saving modes while the device is in operation.

Conclusion

To sum up, the TL497ACDR is a DC-DC switching regulator that integrates a voltage-error amplifier, PWM-control circuit, current sense amplifier and emergency shutdown function to provide users with a suitable solution for their voltage regulation needs. The device is capable of being operated in different modes, making it particularly suitable for a range of applications, such as PCs and notebook computers, mobile phones and PDA, digital audio players, flat panel displays, single board computers, automotive, and even aviation systems.

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