LTC3785-1 Datasheet | Linear Technology

Features n Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT n Power Good Output Indicator n 2.7V to 10V Input and Output Range n Up to 96% Efficiency n Up to 10A of Output Current n All N-channel MOSFETs, No RSENSE™ n True Output Disconnect During Shutdown n Programmable Current Limit and Soft-Start n Optional Short-Circuit Shutdown Timer n Output Overvoltage and Undervoltage Protection n Programmable Frequency: 100k Hz to 1MHz n Selectable Burst Mode® Operation n Available in 24-Lead (4mm × 4mm) Exposed Pad QFN Package APPLICATIONS n Palmtop puters n Handheld Instruments n Wireless Modems n Cellular Telephones 10V, High Efficiency, Buck-Boost Controller with Power Good DESCRIPTION The LTC®3785-1 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 multicell alkaline/Ni MH applications. The operating frequency can be programmed from 100k Hz 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. L, LT, LTC ,LTM and Burst Mode are registered trademarks of Linear Technology Corporation. No RSENSE is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION 270p F VOUT 1.3k 215k 215k 127k VIN VSENSE VCC ISVIN TG1 VBST1 127k 1n F SW1 ISSW1 12k VDRV BG1 LTC3785-1 VC 49.9k RT MODE ISVOUT...