LTC3891MPFE#PBF
数据手册.pdfLINEAR TECHNOLOGY LTC3891MPFE#PBF 降压控制器, 60V-4V电源, 900 kHz, TSSOP-20
The is a high-performance step-down Switching Regulator DC/DC Controller that drives an all N-channel synchronous power MOSFET stage. The 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 output voltage of the LTC3891 can be programmed between 0.8 to 24V. The TRACK/SS pin ramps the output voltages during start-up. Current foldback 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.
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- RSENSE or DCR current sensing
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- Selectable continuous, pulse-skipping or low ripple burst mode operation at light load
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- Selectable current limit
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- Adjustable output voltage soft-start or tracking
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- Power good output voltage monitor
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- Output overvoltage protection
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- <14µA Low shutdown
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- Internal LDO powers gate drive from VIN or EXTVCC
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- No current foldback during start-up