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KB3440EDD Scheda tecnica(PDF) 1 Page - Kingbor Technology Co |
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KB3440EDD Scheda tecnica(HTML) 1 Page - Kingbor Technology Co |
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1 / 20 page  1 kB3440 Micropower Synchronous Buck-Boost DC/DC Converter ■ Single Inductor ■ Fixed Frequency Operation with Battery Voltages Above, Below or Equal to the Output ■ Synchronous Rectification: Up to 96% Efficiency ■ 40 µA Quiescent Current in Burst Mode® Operation ■ Up to 600mA Continuous Output Current ■ No Schottky Diodes Required (VOUT < 4.3V) ■ VOUT Disconnected from VIN During Shutdown ■ 2.5V to 5.5V Input and Output Range ■ Programmable Oscillator Frequency from 300kHz to 2MHz ■ Synchronizable Oscillator ■ Burst Mode Enable Control ■ 5 µA Shutdown Current ■ Small Thermally Enhanced 10-Pin MSOP and (3mm × 3mm) DFN Packages ■ Palmtop Computers ■ Handheld Instruments ■ MP3 Players ■ Digital Cameras The kB3440 is a high efficiency, fixed frequency, Buck- Boost DC/DC converter that operates from input voltages above, below or equal to the output voltage. The topology incorporated in the IC provides a continuous transfer function through all operating modes, making the product ideal for single lithium-ion, multicell alkaline or NiMH applications where the output voltage is within the battery voltage range. The device includes two 0.19 N-channel MOSFET switches and two 0.22 P-channel switches. Switching frequencies up to 2MHz are programmed with an external resistor and the oscillator can be synchronized to an external clock. Quiescent current is only 40 µA in Burst Mode operation, maximizing battery life in portable appli- cations. Burst Mode operation is user controlled and can be enabled by driving the MODE/SYNC pin high. If the MODE/SYNC pin has either a clock or is driven low, then fixed frequency switching is enabled. Other features include a 1 µA shutdown, soft-start con- trol, thermal shutdown and current limit. The kB3440 is available in the 10-pin thermally enhanced MSOP and (3mm × 3mm) DFN packages. Efficiency vs VIN Li-Ion to 3.3V at 600mA Buck-Boost Converter SW1 VIN SHDN/SS MODE/SYNC RT SW2 VOUT FB VC GND 3 7 8 2 1 4 6 9 10 5 kB3440 L1 10 µH R1 340k R2 200k R3 15k RT 60.4k C1: TAIYO YUDEN JMK212BJ106MG C2: TAIYO YUDEN JMK325BJ226MM L1: SUMIDA CDRH6D38-100 *1 = Burst Mode OPERATION 0 = FIXED FREQUENCY C1 10 µF Li-Ion VIN = 2.7V TO 4.2V * + C5 1.5nF C2 22 µF VOUT 3.3V 600mA VIN (V) 2.5 3.0 3.5 4.0 4.5 5.0 100 98 96 94 92 90 88 86 84 82 80 5.5 VOUT = 3.3V IOUT = 100mA fOSC = 1MHz Kingbor Technology Co.,Ltd TEL:(86)0755-26508846 FAX:(86)0755-26509052 APPLICATIONS FEATURES DESCRIPTION TYPICAL APPLICATION |
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