LTC3858EUH#PBF

LTC3858 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 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. This device features a precision 0.8V reference and a power good output indicator. Independent soft-start pins for each controller ramp the output voltages during start-up. The output latch-off feature protects the circuit in short-circuit conditions. It is used in application such as automotive systems, battery operated digital devices, distributed DC power systems etc.

• Wide output voltage range is 0.8V to 24V
• Wide input voltage range is 4V to 38V
• Out-of-phase controllers reduce required input capacitance and power supply induced noise
• RSENSE or DCR current sensing, OPTI-LOOP® compensation minimizes COUT
• Very low dropout operation is 99% duty cycle, adjustable output voltage soft-start
• Power good output voltage monitor, output overvoltage protection
• Output latch-off protection during short circuit, internal LDO powers gate drive from VIN or EXTVCC
• Shutdown current is 8μA typical at (RUN1,2 = 0V, TA = 25°C)
• Operating junction temperature is -40°C to 125°C
• Package style is 32-lead plastic QFN

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