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UC3550G-XX-AF5-R Arkusz danych(PDF) 1 Page - Unisonic Technologies |
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UC3550G-XX-AF5-R Arkusz danych(HTML) 1 Page - Unisonic Technologies |
1 / 10 page UNISONIC TECHNOLOGIES CO., LTD UC3550 CMOS IC www.unisonic.com.tw 1 of 10 Copyright © 2010 Unisonic Technologies Co., Ltd QW-R502-082,B PWM CONTROLLED, PWM/PFM SWITCHABLE STEP-UP DC-DC CONTROLLER DESCRIPTION The UTC UC3550 series is a compact, high efficiency, step-up DC/DC controllers includes an error amplifier, oscillator, PWM comparator, skip cycle comparator, voltage reference, soft-start, and high speed lower ON-resistance driver for driving external power devices (NMOS or NPN) ,Additionally, a CE (chip enable) function that reduces power consumption during shut-down mode. That typically operated from a single-or dual-cell battery packs. It have a driver pin ,ext pin, for connecting to an external transistor(NMOS or NPN). a lower ON-resistance external transistor can obtain larger output current. With only external components, this series allow a simple means to accommodate high output current applications. The UTC UC3550 series goes automatically into skip switching cycles under light load condition to maintain high efficiency. FEATURES * Input Voltage Range:0.9~8V * Output Voltage Range:1.8~6V Programmable in 0.1V with High Accuracy ± 2.5% * High Efficiency 88% (Typ.) * Low Start-up Voltage of 0.9V Typical at IOUT = 1.0mA * Oscillator Frequency: 300kHz.(±20%) * Chip Enable Pin with Pull-up Current Source * High Output Current up to 1000mA (VIN = 2.0V, VOUT =3.3V) SOT-25 4 5 3 2 1 ORDERING INFORMATION Order Number Package Packing UC3550G-xx-AF5-R SOT-25 Tape Reel |
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