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LTC3785 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3785 Datasheet(HTML) 1 Page - Linear Technology |
1 / 20 page LTC3785 1 3785f 10V, High Efficiency, Synchronous, No RSENSETM Buck-Boost Controller 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 volt- age. 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 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 opera- tion is user controlled and can be enabled by driving the MODE pin high. Protection features include foldback current limit, short- circuit and overvoltage protection. ■ Palmtop Computers ■ Handheld Instruments ■ Wireless Modems ■ Cellular Telephones ■ Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT ■ 2.7V to 10V Input and Output Range ■ Up to 96% Efficiency ■ Up to 10A of Output Current ■ All N-Channel MOSFETs, No RSENSE ■ 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 Efficiency vs Input Voltage APPLICATIO S FEATURES DESCRIPTIO TYPICAL APPLICATIO , 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. VIN (V) 2.5 95 10 3785 TA01b 90 85 4 5.5 78.5 100 ILOAD = 1A VOUT = 3.3V FOSC = 500kHz ILOAD = 2A VCC ISVIN TG1 VSENSE BG1 FB VC TG2 BG2 SW2 3785 TA01a VBST1 SW1 ISSW1 ISVOUT RT VDRV ISSW2 VBST2 CCM ILSET MODE RUN/SS VIN VOUT LTC3785 GND 4.7 µF VIN 2.7V TO 10V VOUT 3.3V 5A 22 µF 4.7 µH 100 µF |
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