LTC3890EGN-1#PBF

LTC3890-1 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 phase-lockable frequency of upto 850KHz. 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® compensation 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 encompasses 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 foldback limits MOSFET heat dissipation during short-circuit conditions. It is widely used in applications such as automotive always-on systems, battery operated digital devices, distributed DC power systems etc.

• Wide output voltage range from 0.8V to 24V
• RSENSE or DCR current sensing
• Low shutdown current is 14µA typical at (RUN1,2 = 0V, TA = 25°C)
• Very low dropout operation: 99% duty cycle, adjustable output voltage soft-start or tracking
• Power good output voltage monitor, output overvoltage protection
• Internal LDO powers gate drive from VIN or EXTVCC, no current foldback during start-up
• Programmable frequency is 105KHz typ at (RFREQ = 25K, PLLIN/MODE = DC voltage)
• Feedback current is ±5nA typ at (TA = 25°C, VIN = 12V)
• Operating temperature range from -40°C to 125°C
• Package style is 28-lead plastic SSOP

注释

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