LTC7805 Series

40V Low IQ, Dual, 2-Phase 100% Duty Cycle Synchronous Step-Down Controller

Catalog

40V Low IQ, Dual, 2-Phase 100% Duty Cycle Synchronous Step-Down Controller

Part	Frequency - Switching [Max]	Frequency - Switching [Min]	Function	Synchronous Rectifier	Control Features	Operating Temperature [Max]	Operating Temperature [Min]	Output Configuration	Topology	Package / Case	Output Phases	Qualification	Grade	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Number of Outputs	Mounting Type	Supplier Device Package	Output Type	Duty Cycle (Max) [Max]	Clock Sync
Analog Devices LTC7805RUFDM#TRPBF	3 MHz	100 kHz	Step-Down		Power Good	150 °C	-40 °C	Positive	Buck	28-WFQFN Exposed Pad	2	AEC-Q100	Automotive	40 V	4.5 V	2	Surface Mount Wettable Flank	28-QFN (4x5)	Adjustable	100 %
Analog Devices LTC7805RUFDM#PBF	3 MHz	100 kHz	Step-Down		Power Good	150 °C	-40 °C	Positive	Buck	28-WFQFN Exposed Pad	2	AEC-Q100	Automotive	40 V	4.5 V	2	Surface Mount Wettable Flank	28-QFN (4x5)	Adjustable	100 %

Catalog

40V Low IQ, Dual, 2-Phase 100% Duty Cycle Synchronous Step-Down Controller

Key Features

• Wide Input Voltage Range: 4.5V to 40V

• Wide Output Voltage Range: 0.8V to 40V

• Low Operating IQ14μA (14V to 3.3V, Channel 1 On)

• 14μA (14V to 3.3V, Channel 1 On)

• PassThru™/100% Duty Cycle Capable

• Spread Spectrum Operation

• RSENSEor 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 VINor EXTVCC

• Low Shutdown IQ: 1.5μA

• Side Wettable 28-Lead 4mm × 5mm QFN Package

• AEC-Q100 Qualified for Automotive Applications

Description

The LTC7805 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 among Burst Mode operation, pulse-skipping mode, or continuous inductor current mode at light loads.The 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.APPLICATIONSAutomotive and TransportationIndustrialMilitary / Avionics