LTC3785 Datasheet | Linear Technology

Features n Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT 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, Synchronous, No RSENSE Buck-Boost Controller Description The LTC®3785 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 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. Protection Features include foldback current limit, shortcircuit and overvoltage protection. L, LT, LTC, LTM, Linear Technology, the Linear logo 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 VOUT VIN VCC 205k ISVIN 1.3k 270p F VSENSE 205k 121k TG1 VBST1 SW1 121k 12k ISSW1 VDRV 1n F BG1 LTC3785 59k ISVOUT MODE TG2 4.7µF 0.22µF VIN 2.7V TO...