MAX16840ATE+

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MAX16840ATE+ is a pulse-width modulation current regulator that is used in power management integrated circuits (PMIC - LED Drivers). It is designed to be controlled by I²C and pulse-width modulation (PWM) interface to provide accurate current control for power LED drivers. This device has many features like wide current range, high accuracy, and ultrafast performance.

The MAX16840ATE+ regulates the LED supply current over an input range of 10mA to 1.6A by monitoring the average LED current which is limited by two external shunt resistors (RS1, RS2). This device senses the voltage drop across the shunt resistor and adjusts its output to maintain the desired LED current. It employs a “slope compensation” technique to ensure that the current is maintained over a wide input voltage range.

The MAX16840ATE+ uses an internal hysteretic clock generator to ensure that the PWM output is synchronized to an external oscillator. This feature prevents current spikes that can occur when the device output is switched on and off. The clock frequency of the MAX16840ATE+ is adjustable from 0.25kHz to 13kHz, allowing for different levels of current control. Furthermore, a dual-channel feature makes it possible to control each channel independently.

The most distinctive feature of the MAX16840ATE+ is its high current accuracy. It uses a “Sync-Peak” technique that maintains the maximum current level without overshoot. This technique ensures that the current stays within a tolerance of less than ±2%. This makes it ideal for applications requiring precise current control such as automotive lighting, smart lighting, and flash devices.

The MAX16840ATE+ integrates over-temperature protection, short-circuit protection, and under-voltage lockout to ensure safe operation, even in harsh conditions. It also features two shutdown modes. The low-power mode reduces the device operation voltage down to less than 1V, while the high-power mode conserves power by only enabling the device output when the current limit is exceeded.

The MAX16840ATE+ provides excellent power efficiency with high efficiency-compensating current regulators and PWM dimming control. This device is available in an easy-to-install SOIC-8 package, making it suitable for a wide range of applications. With its high accuracy and efficiency, the MAX16840ATE+ is an ideal choice for LED drivers.

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