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EUP7907A-18VIR1 Datasheet(PDF) 9 Page - Eutech Microelectronics Inc |
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EUP7907A-18VIR1 Datasheet(HTML) 9 Page - Eutech Microelectronics Inc |
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9 / 12 page  EUP7907A DS7907A Ver 1.1 Mar. 2009 9 Function Description The EUP7907A is a high output current, low dropout linear regulator with fast transient response and high PSRR. It offers high output accuracy, extremely low dropout voltage, low quiescent current and fast start-up time. It is designed to work with low-ESR ceramic capacitor, reducing the amount of the PCB area. Only a 2.2uF ceramic capacitor can make the device stable over the whole load range. As shown in the function block diagram, the EUP7907A is composed of the bandgap reference voltage, the error amplifier, P-channel MOSFET pass transistor, internal resistor divider and some additional protection circuits. The reference voltage, connected to the cathode terminal of the error amplifier, compares with the feedback voltage to regulate the output voltage to make it constant over the whole load range. If the feedback voltage is lower than the reference voltage, the pass transistor gate is pulled low to increase its conductivity. This allows more current to flow to the output and increases the output voltage. If the feedback voltage is higher than the reference voltage, the pass transistor allows less current to flow to the output. The feedback point is the output of the internal or external resistor divider connected to the VOUT pin. Supply Input Power on Reset The input voltage supplies current to the output and the operation voltage of the internal circuit. The input voltage is monitored for power on reset (POR) to ensure the regulator is disabled when the input voltage is not high enough for normal operation. The POR threshold voltage is 2.1V at VIN rising typically. Enable/Shutdown The EUP7907A is disabled when the EN pin is connected to ground or the voltage less than 0.4V, reducing the quiescent current to less than 1uA. In the shutdown mode the error amplifier, the reference voltage, the driver and the pass transistor are all disabled. Make this pin higher than 1.5V to enable the device. If this pin of EUP7907A is floating, the regulator on/off is unstable. To assure proper operation the EN should be pulled higher than the level listed in the Electrical Characteristics section. Soft Stop When the regulator is disabled, an internal 400Ω resistor is connected between VOUT and GND. This is intended to discharge COUT. The internal resistor is not used when the device turns on. Current Limit The EUP7907A includes a current limit circuit to monitor the gate voltage of the pass transistor to limit the output current. When the output current is higher than the over-current limit, the circuit will clamp the gate voltage of the pass transistor to keep the current flowing to the output. The typical value is 0.9A. Thermal Shutdown The EUP7907A monitor its temperature automatically. When the operation junction temperature exceeds 170℃, the OTP circuit starts the thermal shutdown function to turn the pass transistor off until it cooled down by 30℃ then the pass transistor turned on again. For continue operation, do not exceed absolute maximum operation junction temperature. The circuit is a non-latched protection. |
Similar Part No. - EUP7907A-18VIR1 |
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Similar Description - EUP7907A-18VIR1 |
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