ADP1148-3.3

The ADP1148 is part of a family of synchronous step-down switching regulator controllers featuring automatic sleep mode to maintain high efficiencies at low output currents.  These devices drive external complementary power MOSFETs at switching frequencies up to 250 kHz using a constant off-time current-mode architecture.

The constant off-time architecture maintains constant ripple current in the inductor, easing the design of wide input range converters. Current-mode operation provides excellent line and load transient response. The operating current level is user programmable via an external current sense resistor. The ADP1148 incorporates automatic Power Saving Sleep Mode operation when load currents drop below the level required for continuous operation. In sleep mode, standby power is reduced to only about 2 mW at V_IN = 10 V. In shutdown, both MOSFETs are turned off.