LTC7806 Series

40V, Low IQ, 3MHz, 2-Phase Synchronous Boost Controller

Catalog

40V, Low IQ, 3MHz, 2-Phase Synchronous Boost Controller

Part	Topology	Synchronous Rectifier	Output Configuration	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Clock Sync	Supplier Device Package	Output Phases	Frequency - Switching [Max]	Frequency - Switching [Min]	Duty Cycle (Max) [Max]	Package / Case	Mounting Type	Number of Outputs	Operating Temperature [Max]	Operating Temperature [Min]	Function	Control Features	Output Type
Analog Devices LTC7806RUFDM#TRPBF	Boost		Positive	40 V	4.5 V		28-QFN (4x5)	2	3 MHz	100 kHz	100 %	28-WFQFN Exposed Pad	Surface Mount Wettable Flank	1	150 °C	-40 °C	Step-Up	Current Limit Frequency Control Power Good Soft Start	Transistor Driver
Analog Devices LTC7806RUFDM#PBF	Boost		Positive	40 V	4.5 V		28-QFN (4x5)	2	3 MHz	100 kHz	100 %	28-WFQFN Exposed Pad	Surface Mount Wettable Flank	1	150 °C	-40 °C	Step-Up	Current Limit Frequency Control Power Good Soft Start	Transistor Driver

Catalog

40V, Low IQ, 3MHz, 2-Phase Synchronous Boost Controller

Key Features

• 2-Phase Operation Reduces Required Input and Output Capacitance and Power Supply Induced Noise

• Synchronous Operation for Highest Efficiency and Reduced Heat Dissipation

• Wide Input Voltage Range: 4.5V to 40V, Operates Down to 1V After Start-Up

• Output Voltage Up to 40V

• Low Operating Quiescent Current: 18μA

• PassThru™Operation: 100% Duty Cycle Capability for Synchronous MOSFET

• RSENSEor Inductor DCR Current Sensing

• Spread Spectrum Operation

• 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

• Input Current Monitor Output

• Internal LDO Powers Gate Drive from VBIASor EXTVCC

• Low Shutdown IQ: 1.5μA

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

• AEC-Q100 Qualified for Automotive Applications

Description

The LTC7806 is a high performance 2-phase single output synchronous boost converter controller that drives two N-channel power MOSFET stages out-of-phase. Its constant-frequency current mode architecture allows a phase-lockable switching frequency of up to 3MHz. High frequency 2-phase operation reduces input and output capacitor requirements and allows the use of smaller inductors compared to the single-phase equivalent. Synchronous rectification increases efficiency, reduces power losses, and eases thermal requirements, simplifying high power boost applications. The synchronous PassThru capability also minimizes losses in automotive start-stop applications.The LTC7806 operates from a wide 4.5V to 40V input supply range. When biased from the boost converter output, the LTC7806 can operate from an input supply as low as 1V after start-up. The very low no-load quiescent current extends operating run time 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 LTC7806 features a precision 1.2V reference, a power good output indicator, and an inductor current monitor.ApplicationsAutomotive and TransportationAudio and RF Power AmplifiersIndustrial and MedicalCommunications