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Datasheet Linear Technology LTC3891EFE#TRPBF

Manufacturer:Linear Technology
Part Number:LTC3891EFE#TRPBF

Low IQ, 60V Synchronous Step-Down Controller


Manufacturer's Classification:

Power Management > Switching Regulator > Step-Down (Buck) Regulators > Micropower Buck Regulators


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
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 4V 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 0.8V to 24V.
The TRACK/SS pin ramps the output voltages during

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