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L6926Q1TR 데이터시트(PDF) 10 Page - STMicroelectronics |
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L6926Q1TR 데이터시트(HTML) 10 Page - STMicroelectronics |
10 / 16 page Additional features and protections L6926 10/16 Doc ID 9302 Rev 9 5 Additional features and protections 5.1 DROPOUT operation The Li-Ion battery voltage ranges from approximately 3 V and 4.1 V - 4.2 V (depending on the anode material). In case the regulated output voltage is from 2.5 V and 3.3 V, it can be that, close to the end of the battery life, the battery voltage goes down to the regulated one. In this case the device stops to switch, working at 100% of duty cycle, so minimizing the dropout voltage and the device losses. 5.2 PGOOD (Power Good output) A power good output signal is available. The VFB pin is internally connected to a comparator with a threshold set at 90% of the of reference voltage (0.6 V). Since the output voltage is connected to the VFB pin by a resistor divider, when the output voltage goes lower than the regulated value, the VFB pin voltage goes lower than 90% of the internal reference value. The internal comparator is triggered and the PGOOD pin is pulled down. The pin is an open drain output and so, a pull up resistor should be connected to him. If the feature is not required, the pin can be left floating. 5.3 Adjustable output voltage The output voltage can be adjusted by an external resistor divider from a minimum value of 0.6V up to the input voltage. The output voltage value is given by: Equation 4 5.4 OVP (overvoltage protection) The device has an internal overvoltage protection circuit to protect the load. If the voltage at the feedback pin goes higher than an internal threshold set 10% (typ) higher than the reference voltage, the low side power MOSFET is turned on until the feedback voltage goes lower than the reference one. During the overvoltage circuit intervention, the zero crossing comparator is disabled so that the device is also able to sink current. 5.5 Thermal shutdown The device has also a thermal shutdown protection activated when the junction temperature reaches 150 °C. In this case both the high side MOSFET and the low side one are turned off. Once the junction temperature goes back lower than 95 °C, the device restarts the normal operation. V OUT 0.6 1 R 2 R 1 ------- + ⎝⎠ ⎛⎞ ⋅ = |
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