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L6928 Arkusz danych(PDF) 1 Page - STMicroelectronics |
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L6928 Arkusz danych(HTML) 1 Page - STMicroelectronics |
1 / 16 page April 2011 Doc ID 11051 Rev 6 1/16 16 L6928 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 µA max shutdown supply current ■ 800 mA max output current ■ Adjustable output voltage from 0.6 V ■ Low dropout 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 ■ 1.4 MHz switching frequency ■ Externally synchronizable from 1 MHz to 2 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. L6928 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 dropout operation. The device is based on a 1.4 MHz 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 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 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 www.st.com |
Podobny numer części - L6928_11 |
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Podobny opis - L6928_11 |
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