Analog Devices Inc. LTC7805 Synchronous Step-Down Controller

Analog Devices Inc. LTC7805 Synchronous Step-Down Controller is a high-performance dual step-down synchronous DC/DC switching regulator controller that drives all N-channel power MOSFET stages. Constant frequency current mode architecture allows a phase-lockable switching frequency of up to 3MHz. The LTC7805 operates from a wide 4.5V to 40V input supply range. Power loss and supply noise are minimized by operating the two controller output stages out-of-phase.

The very low no-load quiescent current extends operating runtime 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 LTC7805 features a precision 0.8V reference and power good output indicators. The MODE pin selects Burst Mode operation, pulse-skipping mode, or continuous inductor current mode at light loads.

The Analog Devices Inc. LTC7805 additionally features spread-spectrum operation, which significantly reduces the peak radiated and conducted noise on both the input and output supplies, making it easier to comply with electromagnetic interference (EMI) standards.


  • 4.5V to 40V wide input voltage range
  • 0.8V to 40V wide output voltage range
  • Low operating IQ
    • 14μA (14V to 3.3V, channel 1 on)
  • PassThru™/100% duty cycle capable
  • Spread spectrum operation
  • RSENSE or DCR current sensing
  • Out-of-phase controllers reduce required input capacitance and power supply induced noise
  • Programmable fixed frequency (100kHz to 3MHz)
  • Phase-Lockable Frequency (100kHz to 3MHz)
  • Selectable continuous, pulse-skipping, or low ripple, Burst Mode® operation at light loads
  • Power Good output voltage monitors
  • Internal LDO powers gate drive from VIN or EXTVCC
  • 1.5μA low shutdown IQ
  • Side wettable 28-Lead 4mm × 5mm QFN package
  • AEC-Q100 automotive qualification in process


  • Automotive and transportation
  • Industrial
  • Military/avionics

Typical Application

Application Circuit Diagram - Analog Devices Inc. LTC7805 Synchronous Step-Down Controller
Gepubliceerd op: 2021-08-17 | Bijgewerkt op: 2022-03-11