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FAN2504S25X Datasheet(PDF) 2 Page - Fairchild Semiconductor |
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FAN2504S25X Datasheet(HTML) 2 Page - Fairchild Semiconductor |
2 / 10 page PRODUCT SPECIFICATION FAN2504/FAN2505 2 REV. 1.0.8 2/14/03 Pin Assignments Pin Descriptions Pin No. FAN2504 FAN2504-XX FAN2505-XX 1. VIN VIN VIN 2. GND GND GND 3. EN EN EN 4. ADJ BYP ERR 5. VOUT VOUT VOUT Pin Name Pin No. Type Pin Function Description ADJ 4 Input FAN2504 Adjust. Ratio of potential divider from VOUT to ADJ determines output voltage. BYP 4 Passive FAN2504-XX Bypass. Connect 470 pF capacitor for noise reduction. ERR 4 Open drain FAN2505-XX Error. Error flag output. 0: Output voltage < 95% of nominal. 1: Output voltage > 95% of nominal. EN 3 Digital Input Enable. 0: Shutdown VOUT. 1: Enable VOUT. VIN 1 Power in Voltage Input. Supply voltage input. VOUT 5 Power out Voltage Output. Regulated output voltage. GND 2 Power Ground. 15 2 3 VIN GND EN 4 VOUT ADJ/BYP/ERR Functional Description Designed utilizing CMOS process technology, the FAN2504/05 family of products are carefully optimized for use in compact battery-powered devices, offering a unique combination of low power consumption, extremely low dropout voltages, high tolerance for a variety of output capacitors, and the ability to disable the output to less than 1µA under user control. In the circuit, a difference amplifier controls the current through a series-pass P-Channel MOSFET, comparing the load voltage at the output with an onboard low-drift bandgap reference. The series resistance of the pass P-Channel MOSFET is approximately 1 Ω, resulting in an unusually low dropout voltage under load when compared to older bipolar pass-transistor designs. Protection circuitry is provided onboard for overload condi- tions. In conditions where the device reaches temperatures exceeding the specified maximums, an onboard circuit shuts down the output, where it remains suspended until it has cooled before re-enabling. The user is also free to shut down the device using the Enable control pin at any time. Careful design of the output regulator amplifier assures loop stability over a wide range of ESR values in the external output capacitor. A wide range of values and types can be accomodated, allowing the user to select a capacitor meeting his space, cost, and performance requirements, and enjoy reliable operation over temperature, load, and tolerance variations. |
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