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S-8550 Datasheet(PDF) 1 Page - Seiko Instruments Inc |
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S-8550 Datasheet(HTML) 1 Page - Seiko Instruments Inc |
1 / 26 page Rev.2.1_01 STEP-DOWN, BUILT-IN FET, SYNCHRONOUS RECTIFICATION, PWM CONTROL SWITCHING REGULATORS S-8550/8551 Series Seiko Instruments Inc. 1 The S-8550/8551 Series is a CMOS synchronous rectification step-down switching regulator which mainly consists of a reference voltage circuit, an oscillator, an error amplifier, a phase compensation circuit, a PWM controller, an under voltage lockout circuit (UVLO), a current limit circuit, and a power MOS FET. The oscillation frequency is high at 1.2 MHz, so a high efficiency, large output current, step-down switching regulator can be achieved by using small external parts. The built-in synchronous rectification circuit makes achieving high efficiency easier compared with conventional step-down switching regulators. A ceramic capacitor can be used as an output capacitor. High-density mounting is supported by adopting a small SOT-23-5 package. The S-8550 and S-8551 Series are offered according to different pin configuration. Features • Oscillation frequency : 1.2 MHz • Input voltage range : 2.0 to 5.5 V • Output voltage range : Arbitrarily settable by external output voltage setting resistor • Output current : 600 mA • Reference voltage : 0.6 V ±2.0% • Efficiency : 92% • Soft-start function : 1 ms typ. • Shutdown function : Shutdown current consumption : 1.0 µA max. • Built-in current limit circuit • Pch power MOS FET on-resistance : 0.4 Ω typ. • Nch power MOS FET on-resistance : 0.3 Ω typ. • Constant continuous mode operation (no light load mode) • Small package : SOT-23-5 • Lead-free products Applications • Mobile devices, such as mobile phones, Bluetooth devices, wireless devices, digital audio players, digital still cameras, portable DVD players, and portable CD players Package Drawing Code Package Name Package Tape Reel SOT-23-5 MP005-A MP005-A MP005-A |
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