MAX5003ESE

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The MAX5003ESE is a high-performance synchronous step-down controller for use with external N-channel MOSFETs. It is suitable for applications in various end markets such as mobile handheld devices, telecom systems, and consumer electronics. This device can operate from a wide input voltage range of 4.5 V to 28 V with a 3.3 V to 15 V adjustable output voltage range.

The MAX5003ESE is a single-phase, synchronous buck-converter controller with low quiescent current and low output dropout. It is designed to be easy to use in a wide variety of applications using multiple power supply architectures. Its variable pulse-width modulation (PWM) frequency range makes it suitable for use with a variety of external components such as MOSFETs, inductors, and capacitors. It features a low external component count and minimal external loop compensation components.

Applications of the MAX5003ESE include small form-factor mobile, gaming, and computing platforms; utility metering; industrial motor control; single-cell Li-Ion rechargeable battery systems; automotive apps; point-of-load regulators; and AC-to-DC adapters.

Working Principle

The MAX5003ESE uses a constant-frequency, pulse-width-modulated (PWM) synchronous buck converter topology to generate an output voltage that is lower than the input voltage. The controller operates at a constant frequency and provides precise output voltage regulation. It can provide high current up to 12 A peak with minimal losses from its synchronous MOSFETs.

The controller uses a hysteretic current-mode control architecture and a high-gain, error amplifier for stability and accuracy. An internal oscillator and adjustable current sense threshold provide precise control of timing and current sensing. The internally compensated error amplifier helps to minimize external component count. The controller features a 178 mV reference voltage for synchronous MOSFET gate-drive.

The MAX5003ESE provides programmable soft-start, overvoltage and undervoltage protection, peak current-limit protection, over-temperature protection, and cycle-by-cycle current limit. The device also has an integrated power-good indicator, an enable input, and a shut-down input so that the device can be shut down while still maintaining the enable signal.

Conclusion

The MAX5003ESE is a versatile, high-performance synchronous step-down controller designed to handle a wide range of applications. Its low operating current, low output dropout voltage, and high peak current capability make it suitable for power supply applications in various end markets. Its hysteretic current-mode control architecture and its variety of protection features make it a safe and reliable choice for use in mobile handheld devices, telecom systems, and consumer electronics.

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