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Low IQ, 60V Synchronous Step-Down Controller
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LTC3891
Low IQ, 60V Synchronous
Step-Down Controller
FEATURES n n n n n n n n n n n n n n n n DESCRIPTION Wide VIN Range: 4V to 60V (65V Abs Max)
Low Operating IQ: 50μA
Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 24V
RSENSE or DCR Current Sensing
Phase-Lockable Frequency (75kHz to 750kHz)
Programmable Fixed Frequency (50kHz to 900kHz)
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 Foldback During Start-Up
Small 20-Pin 3mm × 4mm QFN and TSSOP Packages APPLICATIONS Automotive Always-On Systems Battery Powered Digital Devices
n Distributed DC Power Systems The LTC®3891 is a high performance step-down switching
regulator DC/DC controller that drives an all N-channel
synchronous power MOSFET stage. A constant frequency current mode architecture allows a phase-lockable …