LTC3890-2 Datasheet | Linear Technology

Features n Wide VIN Range: 4V to 60V (65V Abs Max) n Low Operating IQ: 50µA (One Channel On) n Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 24V n RSENSE or DCR Current Sensing n Out-of-Phase Controllers Reduce Input Capacitance and Power Supply Induced Noise n Phase-Lockable Frequency (75k Hz to 850k Hz) n Programmable Fixed Frequency (50k Hz to 900k Hz) n Selectable Continuous, Pulse-Skipping or Low Ripple Burst Mode® Operation at Light Loads n Selectable Current Limit n Very Low Dropout Operation: 99% Duty Cycle n Adjustable Output Voltage Soft-Start or Tracking n Power Good Output Voltage Monitors n Low Shutdown IQ : < 14µA n Internal LDO Powers Gate Drive from VIN or EXTVCC n Small Low Profile (0.75mm) 5mm × 5mm QFN Package n AEC-Q100 Qualified for Automotive Applications APPLICATIONS n Automotive Always-On Systems n Battery Operated Digital Devices n Distributed DC Power Systems 60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller DESCRIPTION The LTC®3890-2 is a high performance dual step-down switching regulator DC/DC controller that drives all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows a phaselockable frequency of up to 850k Hz. Power loss and noise due to the ESR of the input capacitor are minimized by operating the two controller output stages out-of-phase. The 50μA no-load quiescent current extends operating run time in battery-powered systems. OPTI-LOOP® pensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. A wide 4V to 60V input supply range enpasses a wide range of intermediate bus voltages and battery chemistries. Independent TRACK/SS pins for each controller ramp the output voltages during start-up. Current mode control limits the inductor current during short-circuit conditions. The PLLIN/MODE pin selects among Burst Mode operation, pulse-skipping mode, or continuous conduction mode at light loads. For versions with...