LTC3890-3 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 Very Low Dropout Operation: 99% Duty Cycle n Adjustable Output Voltage Soft-Start or Tracking n Power Good Output Voltage Monitor n Low Shutdown IQ: <14µA n Internal LDO Powers Gate Drive from VIN or EXTVCC n Narrow SSOP Package Applications n Automotive Always-On Systems n Battery Operated Digital Devices n Distributed DC Power Systems L, LT, LTC, LTM, Linear Technology, Burst Mode, OPTI-LOOP, Poly Phase and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5481178, 5705919, 5929620, 6100678, 6144194, 6177787, 6304066, 6580258, 7230497. LTC3890-3 60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller Description The LTC®3890-3 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 supply noise are minimized by operating the two controller output stages out-of-phase. The 50μA no-load quiescent current extends operating life 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...