MAX16814AGP/VY+

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The MAX16814AGP/VY+ is a highly efficient, boost-mode controller for driving multiple LEDs in series from a single-cell Li+ battery. The device integrates many features to simplify design and provides open loop operation for driving LEDs from 0.5% to 100% of the linear PTAT (proportional to absolute temperature) current. It provides accurate current sensing and true open loop mode of operation to prevent overvoltage and thermal runaway.

The device uses high-frequency, fixed-frequency, averaged current-mode control (FCM) to maintain a current through each LED identical to the reference control current. The MAX16814AGP/VY+ features analog current setting, improves efficiency with active frequency reduction and improved efficiency in suspend mode. It is designed to minimize external component count with an internal power switch and external current-sense resistor.

The MAX16814AGP/VY+ is ideal for LED applications such as LED backlights and LED backlighting in cell phones and MP3 players. It is well suited for automotive, industrial, and consumer markets that require higher power drive at low voltages and low power dissipation. Its advantages are small solution size, low component count, adjustable current down to 0.5%, and fast transient response. The device also includes an open loop current detection to prevent thermal runaway and overvoltage. The MAX16814AGP/VY+ is available in an 8-pin SOT23-5 package and operates with a supply voltage of 1.8V to 5.5V.

In addition to the basic features, the MAX16814AGP/VY+ also has several features not found in other LED drivers, including the ability to hit a target temperature for each LED, a calibration facility that allows compensation for component variation, an adjustable slew rate, a low power mode, and configurable soft start and shutdown. With these features, the MAX16814AGP/VY+ provides comprehensive control for driving multiple LEDs.

To control the light output, the MAX16814AGP/VY+ uses a unique four-pin architecture. This includes a voltage sensing input (VIN), a current sensing input (IIN), a switch output (SW), and a reference voltage input (VREF). The current signal is sensed and compared with the reference voltage. If the current exceeds the reference voltage, the internal switch and a resistor divider circuit reduce the voltage, thus allowing the current to be reduced.

The open loop sense method used by the MAX16814AGP/VY+ enables the LED driver to maintain a constant level of current to ensure consistent LED output. It also provides over-temperature protection and prevents thermal runaway. Unlike other LED drivers, this device does not require an external temperature monitor and does not require continuous measurement of LED temperature.

Overall, the MAX16814AGP/VY+ is an efficient, boost-mode controller for driving multiple LEDs in series from a single-cell Li+ battery. The device features a small solution size, reduces component count, fast transient response, and open loop current detection to prevent thermal runaway and overvoltage. The MAX16814AGP/VY+ is designed to meet the specific requirements of multiple-channel LED applications, such as backlighting and automotive headlamps.

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