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.
Features
- 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
Applications
- Automotive and transportation
- Industrial
- Military/avionics
Associated Board
Analog Devices Inc. LTC7805 Demo Board DC3138A
Demonstrates the LTC7805 dual DC/DC converter that operates over a 12V to 36V input voltage range.
Typical Application
