TL7660CDG4

Voltage - Output (Min/Fixed):	-Vin, 2Vin
Base Part Number:	TL7660
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Synchronous Rectifier:	No
Frequency - Switching:	10kHz
Current - Output:	--
Voltage - Output (Max):	--
Series:	--
Voltage - Input (Max):	10V
Voltage - Input (Min):	1.5V
Number of Outputs:	1
Output Type:	Fixed
Topology:	Charge Pump
Output Configuration:	Positive or Negative
Function:	Ratiometric
Part Status:	Active
Packaging:	Tube

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TL7660CDG4 Application Field and Working Principle

TL7660CDG4 belongs to the PMIC (Power Management IC) Voltage Regulators DC-DC Switching Regulator product family. This integrated circuit provides a highly efficient, low noise, and low dropout regulated DC supply for the loads up to 500mA. It offers a wide input voltage range of 2.5V to 18V and a regulated output voltage of 1.8V to 6V in 0.1V steps. The TL7660CDG4 is an adjustable linear voltage regulator with an internal current limit and power savings mode that operates in either PWM or PFM mode themselves. This makes the TL7660CDG4 an ideal choice for applications that require power efficiency and high power output at the same time.The TL7660CDG4 features a low dropout (LDO) voltage regulator with a wide input voltage range, an adjustable output voltage range, an adjustable current limit, a low noise operation in PWM and PFM mode, an integrated power saving mode, and a wide operating temperature range. The device has a low output noise (45dB) and is designed to operate up to 500mA. It also has an adjustable current limit, which helps manage inrush currents into sensitive loads. Such features make the TL7660CDG4 an ideal voltage regulator for power supply systems in portable or desktop applications.

Description of Working Principle

The TL7660CDG4 works on a Buck Converter configuration with an adjustable current limit and power saving mode. The Buck Converter is a switched-mode power supply that converts an input voltage and current into an output voltage and current. In the TL7660CDG4, the internal Buck Regulator is composed of a power MOSFET, integrated current sense resistor, voltage and current loop compensation, current limit, and power saving mode, to provide a highly efficient, low noise and low dropout regulated DC supply. The input voltage is connected to the source terminal, while the output voltage is connected to the drain terminal of the power MOSFET, and the regulated current is applied to the output load.The operation of the device is based on the voltage regulator loop, which provides the necessary feedback to control the output voltage. The feedback signal is the difference between the output voltage and the reference voltage. The feedback signal is compared to an internal reference voltage, and the error output is given to an error amplifier, which controls the gate of the power MOSFET, thus controlling the output voltage.The power MOSFET is turned on and off by the switching signal from the error amplifier, such that the average power delivered to the load is equal to the input voltage multiplied by the current limit. The switching frequency is regulated by the frequency setting pin. The internal current limit not only helps the device to maintain a low dropout regulator but also protects the load from extreme currents or short circuit.

Power Saving Mode

The TL7660CDG4 operates in either PWM and PFM mode, depending on the load conditions. In PWM mode, the device operates with high efficiency, low noise, and low output ripple and is suitable for applications requiring high average output current and an average output power of more than 500mA. In PFM mode, the device increases its efficiency by reducing the switching frequency at light load conditions while still providing constant output voltage.The power savings mode of the TL7660CDG4 helps further reduce the power consumption and helps further improve the efficiency. The power savings mode is activated when the load current is below the current limit setting and the ripple voltage of the output is below a set level. When the power savings mode is enabled, the power MOSFET is turned off and the output voltage is monitored. When the output voltage rises above the set level, the power MOSFET is turned on again to provide the output current.

Application Field

Applications for the TL7660CDG4 include digital consumer electronics, mobile computing devices, notebook computers, USB devices, cellphone accessories, and portable consumer electronics. This chip is an ideal solution for compact portable and desktop systems that require power efficiency, low noise and low dropout voltage. This integrated circuit also provides an adjustable current limit capability that can help monitor inrush currents into sensitive loads, thus being a great solution for consumer applications.

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