LTC1624IS8#TRPBF

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. A multifunction pin (ITH /RUN) allows external compensation for optimum load step response plus shutdown. Typical applications are notebook and palmtop computers, PDAs, cellular telephones and wireless modems, battery-operated digital devices, DC power distribution systems, battery chargers.

• N-channel MOSFET drive, implements boost, step-down, SEPIC and inverting regulators
• Wide VIN range: 3.5V to 36V operation, wide VOUT 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
• Current mode operation for excellent line and load transient response
• Internal diode for bootstrapped gate drive
• Feedback current is 50nA, feedback voltage range from 1.178 to 1.201V (TA=25°C, VIN=15V)
• 8-lead plastic SO package
• Operating temperature range from –40°C to 85°C

บันทึก

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