AS1902C23

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Type:	Simple Reset/Power-On Reset
Number of Voltages Monitored:	1
Output:	Push-Pull, Totem Pole
Reset:	Active High
Reset Timeout:	60 ms Minimum
Voltage - Threshold:	2.32V
Operating Temperature:	-40°C ~ 85°C (TA)
Mounting Type:	Surface Mount
Package / Case:	TO-236-3, SC-59, SOT-23-3
Supplier Device Package:	SOT-23-3

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The AS1902C23 is a power management integrated circuit (PMIC) used to supervise power supplies in a variety of electronic devices, such as hand-held computers, cell phones, and even entertainment equipment. In this article, we will discuss the application fields, features, and operating principles of the AS1902C23.
The application fields of the AS1902C23 include portable consumer devices, computers, and other digital systems that require precise power management from momentary short supply conditions. This PMIC can protect devices from current surges and supply irregularities.
The key features of the AS1902C23 are the two extremely precise voltage monitoring circuits. It offers precision voltage monitoring up to 0.1%. These voltage monitors can detect very low voltage drops in the power supply, and the corresponding input is configured to trip before the actual supply voltage drops below the specified threshold. The voltage monitors also boast an adjustable undervoltage lockout (UVLO) feature. This feature is used to prevent any device from being powered off while still in a state of low voltage.
The AS1902C23 also integrates an option for open-drain outputs, LDOS outputs, and push-pull outputs. This makes it easy to switch high-power signals within the circuit. The output signals can be configured to be active high or active low if the voltage monitor detects a low-voltage condition. This can help reduce false triggering in critical power-supply devices.
The working principle of the AS1902C23 is based on two voltage monitoring circuits. These two voltage monitors allow programmable undervoltage lockout protection at two separate adjustable thresholds. As mentioned above, undervoltage lockout prevents the system from being powered off in a low-voltage state.
The two voltage monitors offer identical features. Each monitor has three pins: one Vout pin and two GND pins. The Vout pin connects to a reference voltage which is isolated from the power supply via an internal oscillator. This oscillator sets the delay time for the voltage monitor when detecting an undervoltage condition, as well as allowing the detection of very small voltage drops. The GND pins are used to ground the reference voltage, which helps prevent any interference with the voltage monitoring circuit.
The AS1902C23 comes in a tiny TSSOP-16 package, making it ideal for portable consumer devices. Overall, it is a great choice for precise power supply supervision in a range of applications, from consumer devices to industrial electronics. This PMIC can protect users from dangerous current surges and supply irregularities. With its features, such as low-voltage lockout protection, adjustable voltage monitoring thresholds, and two precise voltage monitoring circuits, it is sure to do an excellent job in any environment.

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