LTC1149CN#PBF

LINEAR TECHNOLOGY  LTC1149CN#PBF  直流-直流开关降压, 逐步递降稳压器, 可调, 12V-48V输入, 10mA输出, 250kHz, DIP-16

The is a synchronous step-down switching Regulator Controller features automatic Burst Mode® operation to maintain high efficiencies at low output currents. This device drive external complementary power MOSFETs at switching frequencies up to 250kHz using a constant OFF-time current-mode architecture. Special onboard regulation and level-shift circuitry allow operation at input voltage from dropout to 48V 60V absolute maximum. 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 LTC1149 series incorporates automatic power saving Burst Mode® operation when load currents drop below the level required for continuous operation. Standby power is reduced to only about 8mW at VIN=12V. In shutdown, both MOSFETs are turned off.

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Up to 95% ultrahigh efficiency

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Current-mode operation for excellent line and load transient response

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High efficiency maintained over wide current range

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Logic-controlled micropower shutdown

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Short-circuit protection

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100% Duty cycle very low dropout operation

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Synchronous FET switching for high efficiency

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Adaptive non-overlap gate drives