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L6928D013TR 데이터시트(PDF) 1 Page - STMicroelectronics |
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L6928D013TR 데이터시트(HTML) 1 Page - STMicroelectronics |
1 / 16 page August 2007 Rev 5 1/16 16 L6928 High efficiency monolithic synchronous step down regulator Features ■ 2V to 5.5V battery input range ■ High efficiency: up to 95% ■ Internal synchronous switch ■ No external schottky required ■ Extremely low quiescent current ■ 1µA max shutdown supply current ■ 800mA max output current ■ Adjustable output voltage from 0.6V ■ Low drop-out operation: up to 100% duty cycle ■ Selectable low noise/low consumption mode at light load ■ Power good signal ■ ±1% output voltage accuracy ■ Current-mode control ■ 1.4MHz switching frequency ■ Externally synchronizable from 1MHz to 2MHz ■ OVP ■ Short circuit protection Applications ■ Battery-powered equipments ■ Portable instruments ■ Cellular phones ■ PDAs and hand held terminals ■ DSC ■ GPS Description The device is dc-dc monolithic regulator specifically designed to provide extremely high efficiency. L6928 supply voltage can be as low as 2V allowing its use in single Li-ion cell supplied applications. Output voltage can be selected by an external divider down to 0.6V. Duty Cycle can saturate to 100% allowing low drop-out operation. The device is based on a 1.4MHz fixed-frequency, current mode-architecture. Low Consumption Mode operation can be selected at light load conditions, allowing switching losses to be reduced. L6928 is externally synchronizable with a clock which makes it useful in noise-sensitive applications. Other features like Powergood, Overvoltage protection, Shortcircuit protection and Thermal Shutdown (150°C) are also present. MSOP8 VFQFPN8 www.st.com Figure 1. Application test circuit L 4.7 µH SYNC LX VFB C1 10 µF 6.3V C2 220pF C4 10 µF 6.3V R2 200K R3 500K R1 100K VIN=2V to 5.5V VOUT=1.8V VCC RUN COMP GND PGOOD D01IN1528 7 6 1 8 3 5 24 |
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