LT1500CS Regulator: Pinout, Block Diagram, Datasheet

The LT1500CS is an adaptive-frequency current mode step-up switching regulator with an internal power switch that is rated up to 700mA. In contrast to pulse skipping switching regulators, the LT1500CS uses a current mode topology that provides lower noise operation and improved efficiency.

Linear Technology/Analog Devices LT1500CS technical specifications, attributes, parameters and parts with similar specifications to Linear Technology/Analog Devices LT1500CS.

■ Low Noise Adaptive-Frequency Current Mode Operation Avoids Low-Frequency Noise at Most Load Currents

■ Can Be Externally Synchronized (LT1500)

■ Micro-power Quiescent Current: 200µA

■ Shutdown Current: 8µA Type

■ Internal Loop Compensation

■ Low-Battery Comparator Active in Shutdown

■ Minimum Input Voltage: 1.8V Type

■ Additional Negative Voltage Feedback Pin (LT1500)

■ Up to 500kHz Switching Frequency

■ Uses Low Profile, Low-Cost Surface Mount Inductors

The LT1500CS uses a current mode architecture without the need for an internal oscillator. Switching frequency is determined by the value of the external inductor used. This technique allows the selection of an operating frequency best suited to each application and considerably simplifies the internal circuitry needed. So we can see the block diagram below.

■ Portable Instrumentation

■ Battery Operated Systems

■ PDA's

■ Standby Power

The LT1500 operates with input voltages from1.8V to 15V and have only a 200µA operating current dropping to 8µA in shutdown. A low-battery comparator is included which stays alive in shutdown. A second output feedback pin with negative polarity allows negative output voltages to be regulated when the switcher is connected up as a Cuk or a flyback converter.

The typical application circuit is shown above.

Analog Devices (NASDAQ: ADI) is a world leader in the design, manufacture, and marketing of a broad portfolio of high-performance analogue, mixed-signal, and digital signal processing (DSP) integrated circuits (ICs) used in virtually all types of electronic equipment. Since our inception in 1965, we have focused on solving the engineering challenges associated with signal processing in electronic equipment.

Download datasheets and manufacturer documentation for Linear Technology/Analog Devices LT1500CS.