Linear Technology LT1939
the LT1939 suitable for regulating power from a wide variety of sources, including automotive batteries, industrial supplies and unregulated wall adapters. The soft-start feature controls the ramp rate of the output voltage, eliminating input current surge during start-up, and also provides output tracking. The LT1939 contains an internal NPN transistor with feedback control which can be configured as a linear regulator or as a linear regulator controller.| Part No. | LT1939 |
|---|---|
| Datasheet | LT1939 Download |
| Manufacturer |  Linear Technology |
| Description | Monolithic 2A Step-Down Regulator Plus Linear Regulator/Controller |
| Buy | Stock & Price |
FEATURES
n n n n n n n n n n LT1939 Monolithic 2A Step-Down Regulator Plus Linear Regulator/ControllerDESCRIPTION
Wide Input Range: 3V to 25V Short-Circuit Protected Over Full Input Range 2A Output Current Capability Adjustable/Synchronizable Fixed Frequency Operation from 250kHz to 2.2MHz Soft-Start/Tracking Capability Output Adjustable Down to 0.8V Adjustable Linear Regulator/Driver with 13mA Output Capability Power Good Comparator with Complementary Outputs Low Shutdown Current: 12μA Thermally Enhanced 3mm × 3mm DFN Package The LT®1939 is a current mode PWM step-down DC/DC converter with an internal 2.3A switch. The wide input range of 3V to 25V makes Resistor-programmable 250kHz to 2.2MHz frequency range and synchronization capability enable optimization between efficiency and external component size. Cycleby-cycle current limit, frequency foldback and thermal shutdown provide protection against a shorted output. The LT1939’s low current shutdown mode (<12μA) enables easy power management in battery-powered systems.
