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AP7365-XXWG-7 Datasheet(PDF) 11 Page - Diodes Incorporated |
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AP7365-XXWG-7 Datasheet(HTML) 11 Page - Diodes Incorporated |
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11 / 20 page  AP7365 600mA, Low Quiescent Current, Fast Transient Low Dropout Linear Regulator AP7365 Document number: DS32260 Rev. 2 - 2 11 of 20 www.diodes.com September 2010 © Diodes Incorporated Application Note Input Capacitor A 1 μF ceramic capacitor is recommended between IN and GND pins to decouple input power supply glitch and noise. The amount of the capacitance may be increased without limit. This input capacitor must be located as close as possible to the device to assure input stability and reduce noise. For PCB layout, a wide copper trace is required for both IN and GND pins. A lower ESR capacitor type allows the use of less capacitance, while higher ESR type requires more capacitance. Output Capacitor The output capacitor is required to stabilize and improve the transient response of the LDO. The AP7365 is stable with very small ceramic output capacitors. Using a ceramic capacitor value that is at least 1μF with ESR > 15mΩ on the output ensures stability. Higher capacitance values help to improve line and load transient response. The output capacitance may be increased to keep low undershoot and overshoot. Output capacitor must be placed as close as possible to OUT and GND pins. Region of Stable COUT ESR vs. Load Current 0.001 0.01 0.1 1 10 100 0 100 200 300 400 500 600 Load Current (mA) Adjustable Operation The AP7365 provides output voltage from 0.8V to 5.0V through external resistor divider as shown below. 1uF IN GN D EN OU T E nable AD J R2 R1 1uF V IN V OUT A P 7365 The output voltage is calculated by: ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ + = 2 R 1 R 1 REF V OUT V Where VREF=0.8V (the internal reference voltage) Rearranging the equation will give the following that is used for adjusting the output to a particular voltage: ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ − = 1 REF V OUT V 2 R 1 R To maintain the stability of the internal reference voltage, R2 need to be kept smaller than 80kΩ. No Load Stability Other than external resistor divider, no minimum load is required to keep the device stable. The device will remain stable and regulated in no load condition. ON/OFF Input Operation The AP7365 is turned on by setting the EN pin high, and is turned off by pulling it low. If this feature is not used, the EN pin should be tied to IN pin to keep the regulator output on at all time. To ensure proper operation, the signal source used to drive the EN pin must be able to swing above and below the specified turn-on/off voltage thresholds listed in the Electrical Characteristics section under VIL and VIH. Current Limit Protection When output current at OUT pin is higher than current limit threshold, the current limit protection will be triggered and clamp the output current to approximately 1.4A to prevent over-current and to protect the regulator from damage due to overheating. Short Circuit Protection When OUT pin is short-circuit to GND, short circuit protection will be triggered and clamp the output current to approximately 240mA. This feature protects the regulator from over-current and damage due to overheating. Thermal Shutdown Protection Thermal protection disables the output when the junction temperature rises to approximately +145°C, allowing the device to cool down. When the junction temperature reduces to approximately +130°C the output circuitry is enabled again. Depending on power dissipation, thermal resistance, and ambient temperature, the thermal protection circuit may cycle on and off. This cycling limits the heat dissipation of the regulator, protecting it from damage due to overheating. Stable Range Unstable Range Unstable Range VIN=4.3V CIN=COUT=1μF |
Similar Part No. - AP7365-XXWG-7 |
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Similar Description - AP7365-XXWG-7 |
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