Product Details
●The ADP1649 is a very compact, highly efficient, single white LED flash driver for high resolution camera phones that improves picture and video quality in low light environments. The device integrates a programmable 1.5 MHz or 3 MHz synchronous inductive boost converter, an I2C-compatible interface, and a 1000 mA current source. The high switching frequency enables the use of a tiny, 1 mm high, low cost, 1 μH power inductor, and the current source permits LED cathode grounding for thermally enhanced, low EMI, and compact layouts.
●The LED driver maximizes efficiency over the entire battery voltage range to maximize the input power-to-LED power conversion and to minimize battery current draw during flash events. A programmable dc battery current limit safely maximizes LED current for all LED VF and battery voltage conditions.
●Two independent TxMASK inputs permit the flash LED current and battery current to reduce quickly during a power amplifier current burst. The I2C-compatible interface enables the programmability of timers, currents, and status bit readback for monitoring the operation and for safety control.
●The ADP1649 is available in a compact 12-ball, 0.5 mm pitch WLCSP package, and operates within specification over the full −40°C to +125°C junction temperature range.
●Applications
● Camera enabled cellular phones and smart phones
● Digital still cameras, camcorders, and PDAs
●### Features and Benefits
● Ultracompact solution
●Small, 2 mm × 1.5 mm, 12-ball WLCSP package
●Smallest footprint, 1 mm height, 1 μH power inductor
● High efficiency: 90% peak
●Reduces high levels of input battery current during flash
●Limits battery current drain in torch mode
● I2C programmable
●Currents of up to 1000 mA in flash mode for 1 LED with ±7% accuracy over all conditions
●Currents of up to 200 mA in torch mode
● Control
●I2C-compatible control registers
●External strobe and torch input pins
●2 transmitter mask (TxMASK) inputs
● Safety
●Thermal overload protection
●Inductor fault detection
●LED short-circuit and open circuit protection
● See data sheet for additional features
