LM26001B

LM26001B 1.5A Switching Regulator with High Efficiency Sleep Mode May 29, 2008 LM26001B 1.5A Switching Regulator with High Efficiency Sleep Mode General Description The LM26001B is a switching regulator designed for the high efficiency requirements of applications with stand-by modes. The device features a low-current sleep mode to maintain efficiency under light-load conditions and current-mode control for accurate regulation over a wide input voltage range. Quiescent current is reduced to 10 µA typically in shutdown mode and less than 40 µA in sleep mode. Forced PWM mode is also available to disable sleep mode. The LM26001B can deliver up to 1.5A of continuous load current with a fixed current limit, through the internal N-channel switch. The part has a wide input voltage range of 4.0V to 18V and can operate with input voltages as low as 3V during line transients. Operating frequency is adjustable from 150 kHz to 500 kHz with a single resistor and can be synchronized to an external clock. Other features include Power good, adjustable soft-start, enable pin, input under-voltage protection, and an internal bootstrap diode for reduced component count. Features ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ High efficiency sleep mode 40 µA typical Iq in sleep mode 10 µA typical Iq in shutdown mode 3.0V minimum input voltage 4.0V to 18V continuous input range 2.0% reference accuracy Cycle-by-cycle current limit Adjustable Frequency (150 kHz to 500 kHz) Synchronizable to an external clock Power ...