Compact, High Efficiency, High Power, Flash/Torch LED Driver with Dual Interface
The device has a dual-mode interface that is configurable to 2-bit logic or an I2C® interface. The indicator and high power LED currents are programmable with external resistors or through the I2C interface. To maximize overall flash brightness, the ADP1653 offers an input to reduce flash LED current in less than 50 μs, referred to as the Tx mask. Tx masking reduces battery stress by scaling back flash LED current during an RF transmission.
The ADP1653 solution requires only four external components in I2C mode and fits in a 6.4 mm × 7.2 mm space. The part integrates multiple safety features such as soft start, flash timeout, output current limit, thermal protection, and overvoltage protection.
The ADP1653 operates over the −40°C to +125°C junction temperature range.
Data Sheet, Rev. B, 9/07
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At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
The motherboard features a 3.3 V regulator and a 1.8 V regulator. The jumpers on the bottom left of the motherboard set the VIC voltage, which is the I2C voltage for the control pins. Users can choose among the 1.8 V, 3.3 V, or 5 V USB or the external VBAT as the supply voltage for the daughterboard.
The daughterboard contains numerous jumpers and test points for easy evaluation of the board. Also included with the kit are two current probes that can be plugged directly into jumper heads to measure currents with current probes.