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PMIC - Voltage Reference: AP431SHBN1TR-G1 Application Field and Working Principle

Voltage reference is an important component within power management systems which provide precise, low-cost and stable reference for other integrated circuits. AP431SHBN1TR-G1 is a voltage reference component from Diodes Incorporated, aiming to fulfill the precise voltage requirement for advanced mobile, computing and consumer applications.

Application Fields

AP431SHBN1TR-G1 is widely used in PDAs and cellphones, wearables and other portable devices, and other computing and consumer applications. This device integrates integration circuit, protection circuit and reference voltage circuit and offers ultra-low power dissipation during operation. In addition, it is designed for extreme space limit on the customer PCB boards and some reference circuits requiring a fast changing of reference voltage.

Working Principle

The AP431SHBN1TR-G1 employs a three-terminal zener-based reference. Its reference voltage can be input from a voltage divider and buffered internally by an instrumentation amplifier. Its reference voltage will remain constant over temperature and time ranges. To guarantee a stable reference voltage, a series of bypass capacitors are required for the input terminals and output terminals of the device. The recommended capacitor values and pin configurations are available in the manufacturer\'s data sheet.

The device\'s output voltage is regulated against an external reference voltage and this reference voltage remains very stable over temperature and time in a wide temperature range. The typical operating temperature range is -40°C to 85°C. At the lower and upper ends of the temperature range, its output voltage will be slightly affected, but the effect will be minimal in average. The device features low droop rate and low quiescent current. It is also immune to noise and voltage spikes.

Conclusion

The AP431SHBN1TR-G1 is a voltage reference component from Diodes Incorporated. It is widely used in PDAs, cellphones, wearables and other portable devices, and other computing and consumer applications. Its output voltage is regulated against an external reference voltage and this reference voltage remains very stable over temperature and time in a wide temperature range. The device also features ultra-low power dissipation during operation and low droop rate and quiescent current, and it is also immune to noise and voltage spikes.

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