LTC3858IUH-2#PBF

LTC3858IUH-2#PBF is a low IQ, dual 2-phase synchronous step-down controller. It is a high-performance dual step-down switching regulator controller that drives all N-channel synchronous power MOSFET stages. A constant-frequency current mode architecture allows for a phase-lockable frequency of up to 850KHz. Power loss and noise due to the input capacitor ESR are minimized by operating the two controller outputs out of phase. The 170μA 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. The LTC3858-2 differs from the LTC3858 by having the overvoltage protection crowbar and short-circuit latch off disabled. Independent soft-start pins for each controller ramp the output voltages during start-up. Applications include automotive systems, battery-operated digital devices, and distributed DC power systems.

• Input DC supply current is 8μA typ (shutdown, RUN1, 2 = 0V, TA = 25°C)
• Input supply operating voltage range from 4 to 38V (TA = 25°C), no current foldback during start-up
• Wide output voltage range from 0.8V ≤ VOUT ≤ 24V
• RSENSE or DCR current sensing, OPTI-LOOP ® Compensation minimizes COUT
• Out-of-phase controllers reduce required input capacitance and power supply induced noise
• Programmable frequency range from 375 to 505KHz (RFREQ = 65k, PLLIN/MODE = DC Voltage)
• Selectable continuous, pulse-skipping or Burst Mode® operation at light loads
• Very low dropout operation 99% duty cycle, adjustable output voltage soft-start or tracking
• Power good output voltage monitor, internal LDO powers gate drive from VIN or EXTVCC
• 32 lead plastic QFN package, operating junction temperature range from -40°C to 125°C

Note

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