MAX6325ESA

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MAX6325ESA offers a fully integrated solution for providing adjustable precision power supply reference voltages. It is part of a family of high accuracy positive and negative voltage references and offers high accuracy (1.3% initial accuracy over line and load conditions), exceptional temperature stability (1.3 ppm/°C), low current consumption (480 μA), and reverse-battery protection.

The MAX6325ESA integrated circuit has been designed to provide a stable low-temperature coefficient output voltage reference and is suited for many precision power supply applications such as battery chargers, power supplies, programmable reference sources, analog-to-digital converters, thermistors, and temperature sensors. It also offers enhanced accuracy for A/D and D/A integrated circuits. Its precision and low current consumption makes it an ideal choice for any low-power, portable electronic device such as mobile phones, notebooks, and medical equipment.

The device consists of two main components: a precision voltage reference and a low dropout (LDO) regulator. The reference circuit consists of a CMOS bandgap reference and voltage-controlled trimming circuitry. The bandgap provides an output voltage of 1.225V and a temperature-independent output of 1.04V. The trim circuit provides a programmable output range of 0.58V to 1.22V. Both the bandgap and the trim circuit are powered by a +2.7V to +5.5V supply. The trimming circuitry is implemented using a MOS transistor to control the current through the feedback loop, with the voltage on the trimming pin programming the output voltage from 0.58V to 1.22V.

Low dropout (LDO) regulator provides an output with low noise and high PSRR for precise operation in low voltage applications. The LDO regulator uses a P-channel MOSFET as a pass device to control the output voltage. Incoming supply current is then adjusted to maintain an accurate output voltage as the input voltage and/or load change. By lowering the on-resistance of the P-MOS, leakage and power dissipation are virtually eliminated.

The MAX6325ESA operates in two modes: Pulse Coupled Mode (PCM) and Parallel Mode (PM). In PCM, the bandgap and trimming circuits are directly connected to the output terminal. This provides a fast response to external output voltage transients and higher reference accuracy by directly controlling the output voltage. In PM, the bandgap and trimming circuits are connected in parallel to the output terminal, providing a slower response to output voltage transients but better power supply rejection. This mode is ideal for low power supplies.

The MAX6325ESA is an ideal choice for many power supply applications. Its precision, low current consumption, and high temperature stability make it an ideal choice for any low power, portable device. Its reverse-battery protection ensures the device is not damaged during reverse biasing. Its low dropout regulator ensures low capacitance at the output and low output noise suitable for precision operation. In conclusion, the MAX6325ESA has a wide range of applications due to its precision, low power consumption, and its reverse-battery protection.

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