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ZXCL1280H5 Datasheet(PDF) 7 Page - Zetex Semiconductors |
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ZXCL1280H5 Datasheet(HTML) 7 Page - Zetex Semiconductors |
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7 / 11 page  Input to Output Diode In common with many other LDO regulators, the ZXCL device has an inherent diode associated with the output series pass transistor of each regulator. This diode has its anode connected to the output and its cathode to the input. The internal diode is normally reverse biased, but will conduct if the output is forced above the input by more than a VBE (approximately 0.6V). Current will then flow from Vout to Vin. For safe operation, the maximum current in this diode should be limited to 5mA continuous and 30mA peak. An external schottky diode may be used to provide protection when this condition cannot be satisfied. Increased Output current Any ZXCL series device may be used in conjunction with an external PNP transistor to boost the output current capability. In the application circuit shown below, a FMMT717 device is employed as the external pass element. This SOT23 device can supply up to 2.5A maximum current subject to the thermal dissipation limits of the package (625mW). Alternative devices may be used to supply higher levels of current. Note that with this arrangement, the dropout voltage will be increased by the VBE drop of the external device. Also, care should be taken to protect the pass transistor in the event of excessive output current. ISSUE 5 - NOVEMBER 2001 ZXCL250 ZXCL260 ZXCL280 ZXCL300 ZXCL330 ZXCL400 7 VIN EN VO U1 ZXCL SERIES Q1 FMMT717 R1 5.6R C2 1uF C1 1uF C3 1uF VOUT VIN Scheme to boost output current to 2A |
Similar Part No. - ZXCL1280H5 |
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Similar Description - ZXCL1280H5 |
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