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EUP7961C-18BIR1 Datasheet(PDF) 9 Page - Eutech Microelectronics Inc |
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EUP7961C-18BIR1 Datasheet(HTML) 9 Page - Eutech Microelectronics Inc |
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9 / 13 page  EUP7961 DS7961 Ver 1.4 Jan. 2009 9 Application Note Input Capacitor An input capacitance of 1µF is required between the EUP7961 input pin and ground (the amount of the capacitance may be increased without limit).This capacitor must be located very close to the input pin and returned to a clean analog ground. Any good quality ceramic, tantalum, or film capacitor can be used at the input. If a tantalum capacitor is used at the input, it must be guaranteed by the manufacturer to have asurge current rating sufficient for the application. There are no requirements for the ESR on the input capacitor, but tolerance and temperature coefficient must be considered when selecting the capacitor to ensure the capacitance will be 1µF over the entire operating temperature range. Output Capacitor The EUP7961 is designed specifically to work with small ceramic output capacitors. A ceramic capacitor (temperature characteristics X7R, X5R, Z5U, or Y5V) in 4.7µF to 22µF range with 5mΩ to 200mΩ ESR range is suitable in the EUP7961 application circuit. The output capacitor must meet the requirement for minimum 4.7µF over the entire operating range and also have an ESR (Equivalent Series Resistance) value which is within a stable range (5mΩ to 200mΩ) No-Load Stability The EUP7961 will remain stable and in regulation with no external load. This is specially important in CMOS RAM keep-alive applications. On/Off Input Operation The EUP7961 is turned off by pulling the VEN pin low, and turned on by pulling it high. If this feature is not used, the VEN pin should be tied to VIN to keep the regulator output on at all time. To assure proper operation, the signal source used to drive the VEN input must swing above and below the specified turn-on/off voltage thresholds listed in the Electrical Characteristics section under VIL and VIH. ERROR Flag Operation The EUP7961 produces a logic low signal at the ERROR Flag pin when the output drops out of regulation due to low input voltage, current limiting, or thermal limiting. This flag has a built in hysteresis. The ERROR is an open drain output. Hence, the ERROR pin should be pulled high through a pull up resistor. The ERROR pin must be connected to ground if this function is not used. In shutdown, the ERROR pin is Hi-Z state to save input power. Adjustable Operation The adjustable version of the EUP7961 has an output voltage range of 0.8V to 4.5V. The output voltage of the EUP7961 adjustable regulator is programmed using an external resistor divider as shown in Figure3. The output voltage is calculated using: Where: Vref= 0.8V typ. (the internal reference voltage) Utilize the following equation for adjusting the output to a particular voltage: Choose R2=50k to optimize accuracy, power supply rejection, noise and power consumption. Power Dissipation EUP7961 can deliver a continuous current of 2A over the full operating temperature range. A heatsink may be required depending on the maximum power dissipation and maximum ambient temperature of the application. Under all possible conditions, the junction temperature must be within the range specified under operating conditions. The total power dissipation of the device is given by: ( ) ( ) GND I IN V OUT I OUT V IN V D P + − = Where IGND is the operating ground current of the device (specified under Electrical Characteristics). The maximum allowable temperature rise (TRmax) depends on the maximum ambient temperature (TAmax) of the application, and the maximum allowable junction temperature (TJmax): TRmax= TJmax-TAmax The maximum allowable value for junction to ambient Thermal Resistance, θJA , can be calculated using the formula: θJA =TRmax/PD ) R R (1 V V 2 1 ref O + × = − = 1 0.8V V R P O 2 I |
Similar Part No. - EUP7961C-18BIR1 |
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Similar Description - EUP7961C-18BIR1 |
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