LT1959IS8#PBF

PMIC - Voltage Regulators - DC DC Switching Regulators

The LT1959IS8#PBF is a CMOS Charge Pump and Low Dropout (LDO) Linear Regulator integrated circuit (IC). It is designed for low voltage, high current applications. As a LDO regulator, it provides precise regulation of the output voltage, which is determined by an external resistor. As a charge pump, it converts the input voltage to a higher voltage by a switching action, regulated by internal current limit, and with maximum peak current limitations.

The LT1959IS8#PBF is designed to supply both low noise and high current output. Its excellent load and line regulation makes it a perfect device to supply voltage rails required in RF power amplifiers, transmitters, receiver and other radio frequency applications. Its high output current capability allows it to supply all popular HF, VHF and UHF radio frequency transceivers.The device is specified for small space board size, low temperature operation and low cost.

Application Field

The LT1959IS8#PBF is designed to perfectly suit the CMOS and LDO regulator industry. It is ideal for a wide range of automotive, industrial, consumer and computer applications. Such applications include battery powered devices, portable electronics and all types of mobile phone and PDA devices. The IC is especially suited for Li-ion batteries and remote monitoring applications.

The LT1959IS8#PBF is available in the wide temperature range –40°C and +85°C. Its low dropout voltage (430mV at 500mA) and low operating current of 1μA ensures that it can operate in extreme environmental conditions. The output voltage can be varied and adjusted using an external resistor.

Working Principle

The LT1959IS8#PBF is designed to be a dual mode charge pump and LDO regulator. It generates a regulated output voltage by combining an oscillator and multiple capacitors. As a charge pump, it regulates the amplitude of the output voltage by controlling the average current output to the capacitors. The average current is controlled by changing the duty cycle of the oscillator. In LDO regulator mode, it regulates the output voltage by controlling the switching current. The switching current is proportional to the difference between the regulated output voltage and the input voltage.

The LT1959IS8#PBF features an adjustable output voltage and is capable of delivering up to 500mA of output current. It operates in two modes; burst mode operation and continuous charging operation. In burst mode, the output voltage is made with one switched cycle and no additional charge is required while in continuous charging mode, the output voltage is repeated as long as the input voltage is greater than the output voltage. It also features an adjustable voltage switching current and a latch up immunity.

Conclusion

The LT1959IS8#PBF device is an ideal choice for a variety of applications that require high output current and accurate regulation. It combines CMOS Charge Pump and LDO Linear Regulator technology to provide a powerful solution to battery powered and remote monitoring applications. The device operates in a wide temperature range and is available in a very small size.