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L6926Q1 데이터시트(PDF) 1 Page - STMicroelectronics |
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1 / 16 page April 2011 Doc ID 9302 Rev 9 1/16 16 L6926 High efficiency monolithic synchronous step down regulator Features ■ 2 V to 5.5 V battery input range ■ High efficiency: up to 95% ■ Internal synchronous switch ■ No external Schottky required ■ Extremely low quiescent current ■ 1 mA max shutdown supply current ■ 800 mA max output current ■ Adjustable output voltage from 0.6 V ■ 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 ■ 600 kHz switching frequency ■ Externally synchronizable from 500 kHz to 1.4 MHz ■ OVP ■ Short circuit protection Applications ■ Battery-powered equipment ■ 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. L6926 supply voltage can be as low as 2 V allowing its use in single Li-ion cell supplied applications. Output voltage can be selected by an external divider down to 0.6 V. Duty cycle can saturate to 100% allowing low drop-out operation. The device is based on a 600 kHz fixed- frequency, current mode-architecture. Low consumption mode operation can be selected at light load conditions, allowing switching losses to be reduced. L6926 is externally synchronizable with a clock which makes it useful in noise- sensitive applications. Other features like power- good, overvoltage protection, short-circuit protection and thermal shutdown (150 °C) are also present. VFQFPN8 MSOP8 (3x3x1.0 mm) Figure 1. Application test circuit L 6.8 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 D01IN1305 7 6 1 8 3 5 24 www.st.com |
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