特点
N-Channel MOSFET Drive
Implements Boost, Step-Down, SEPIC and Inverting Regulators
Wide V
IN
Range: 3.5V to 36V Operation
Wide V
OUT
Range: 1.19V to 30V in Step-Down Configuration
±1% 1.19V Reference
Low Dropout Operation: 95% Duty Cycle
200kHz Fixed Frequency
Low Standby Current
Very High Efficiency
Remote Output Voltage Sense
Logic-Controlled Micropower Shutdown
Internal Diode for Bootstrapped Gate Drive
Current Mode Operation for Excellent Line and Load Transient Response
Available in an 8-Lead SO Package
典型应用
描述
描述 The LTC?1624 is a current mode switching regulator controller that drives an external N-channel power MOSFET using a fixed frequency architecture. It can be operated in all standard switching configurations including boost, step-down, inverting and SEPIC. Burst Mode? operation provides high efficiency at low load currents. A maximum high duty cycle limit of 95% provides low dropout operation which extends operating time in battery-operated systems. The operating frequency is internally set to 200kHz, allowing small inductor values and minimizing PC board space. The operating current level is user-programmable via an external current sense resistor. Wide input supply range allows operation from 3.5V to 36V (absolute maximum). A multifunction pin (I TH /RUN) allows external compensation for optimum load step response plus shutdown. Soft start can also be implemented with the I TH /RUN pin to properly sequence supplies.