LTC3785-1 Datasheet

• Single Inductor Architecture Allows V_IN Above, Below or Equal to V_OUT
• Power Good Output Indicator
• 2.7V to 10V Input and Output Range
• Up to 96% Efficiency
• Up to 10A of Output Current
• All N-Channel MOSFETs, No R_SENSE^™
• True Output Disconnect During Shutdown
• Programmable Current Limit and Soft-Start
• Optional Short-Circuit Shutdown Timer
• Output Overvoltage and Undervoltage Protection
• Programmable Frequency: 100kHz to 1MHz
• Selectable Burst Mode^® Operation
• Available in 24-Lead (4mm × 4mm) Exposed Pad QFN Package

• Palmtop Computers
• Handheld Instruments
• Wireless Modems
• Cellular Telephones

The LTC3785-1 is a high power synchronous buck-boost controller that drives all N-channel power MOSFETs from input voltages above, below and equal to the output voltage. With an input range of 2.7V to 10V, the LTC3785-1 is well suited for a wide variety of single or dual cell Li-Ion or multi-cell alkaline/NiMH applications.

The operating frequency can be programmed from 100kHz to 1MHz. The soft-start time and current limit are also programmable. The soft-start capacitor doubles as the fault timer which can program the IC to latch off or recycle after a determined off time. Burst Mode operation is user controlled and can be enabled by driving the MODE pin high. The LTC3785-1 includes a Power Good output that indicates when the output voltage is within 7.5% of its designed setpoint.

Protection features include foldback current limit, short-circuit and overvoltage protection.