LTC3891EFE#PBF - 

制造商：

LINEAR TECHNOLOGY LINEAR TECHNOLOGY

制造商产品编号：

LTC3891EFE#PBF

仓库库存编号：

2102661

技术数据表：

(EN)

The LTC3891EFE#PBF is a high performance synchronous step-down DC/DC Controller drives an all N-channel synchronous power MOSFET stage. A constant frequency current mode architecture allows a phase-lockable frequency of up to 750kHz. The 50μA no-load quiescent current extends operating run time in battery-powered systems. OPTI-LOOP? compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC3891 features a precision 0.8V reference and power good output indicator. A wide 4 to 60V input supply range encompasses a wide range of intermediate bus voltages and battery chemistries. The TRACK/SS pin ramps the output voltages during start-up. Current fold back limits MOSFET heat dissipation during short-circuit conditions. The PLLIN/MODE pin selects among Burst Mode? operation, pulse-skipping mode or continuous conduction mode at light loads.

• Low operating IQ (50μA)
• Wide output voltage range (0.8V <= VOUT <= 24V)
• RSENSE or DCR current sensing
• 75 to 750kHz Phase-lockable frequency
• 50 to 900kHz Programmable fixed frequency
• Selectable continuous, pulse-skipping or low ripple Burst Mode? operation at light load
• Selectable current limit
• Very low dropout operation (99% duty cycle)
• Adjustable output voltage soft-start or tracking
• Power good output voltage monitor

• Output overvoltage protection
• Low shutdown IQ (<14μA)
• Internal LDO powers gate drive from VIN or EXTVCC
• No current fold back during start-up