MAX845EUA-T

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MAX845EUA-T application field and working principle

The MAX845EUA-T is a hybrid peripheral power management integrated circuit (PMIC) from Maxim Integrated. It contains a step-up and step-down converter, two linear regulators, two low-dropout (LDO) regulators, an LED driver, an audio amplifier, and a power-/battery-management unit. This device is suitable for providing power in small-form-factor, mobile devices such as digital cameras, mobile phones, and tablet computers.

The MAX845EUA-T is a unique power management solution that provides superior efficiency and small form factor. It contains multiple power-mode and charge-mode selectable features. It features power-path and power-comparator blocks. With its low stand-by current and low quiescent current, coupled with its ability to operate at a wide supply voltage range, it can reduce power loss in mobile applications. Its integrated thermal protection feature and current limiter provide superior protection against thermal runaway and short-circuits.

Application field

The MAX845EUA-T is ideal for providing power in small-form-factor mobile devices such as:

• Digital cameras
• Mobile phones
• Tablet computers
• Portable media players
• Wearable electronic devices
• Smart phones

Main Features

• 2 LDO regulators
• 2 linear regulators
• One step-up and one step-down voltage regulator
• One LED driver
• One audio amplifier
• One power-/battery-management teal
• Low power consumption and high efficiency (up to 90%)
• Excellent thermal protection
• Wide operating temperature range (-40°C to +85°C)
• Wide input voltage range (2.1V - 5.5V)
• Compatible with I2C, SMBus, and SVS (Serial Voltage Scaling) communication interface

Working Principle

The MAX845EUA-T is a power management IC that contains several integrated blocks which work together to provide power supply to external components. It contains a step-up and step-down buck-boost switching regulators, two linear regulators, two low-dropout (LDO) regulators, an LED driver, and an audio amplifier. Each of these power-management blocks is designed to supply power to different external components in a mobile device.

The MAX845EUA-T has four main power blocks, which are the step-up, step-down, linear, and LDO regulators. The step-up converters use a power transistor to boost a low input voltage to a higher output voltage, while the step-down converters use an inductor and a low-side MOSFET to step the input voltage down to a lower output voltage. Both step-up and step-down converters provide efficient power conversion with a wide input voltage range.

The linear and LDO regulators, on the other hand, provide low-noise supply voltages to external components that require a very low output noise level. The linear regulators are powered by a pre-regulated supply voltage, while the LDO regulators are powered directly from the input voltage. The LED driver supplies current to the LEDs and the audio amplifier provides low-noise audio output.

The MAX845EUA-T also has a dedicated power-/battery-management unit that monitors the device’s power supply and, when necessary, shuts down the device to protect it from overheating or low-battery conditions. Additionally, the device can communicate with other devices through its I2C, SMBus, and SVS (serial voltage scaling) communication interface.

In summary, the MAX845EUA-T is a hybrid power management IC that is designed for use in small-form-factor, mobile devices such as digital cameras, mobile phones, and tablet computers. It provides efficient power conversion, low-noise supply voltages, and a dedicated power-/battery-management unit to protect the device from thermal runaway, short-circuits, and other reliability issues.

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