Product Details
●The ADP1650 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 1500 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 pro-grammability of timers, currents, and status bit readback for operation monitoring and safety control.
●The ADP1650 comes 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
● LED current source for local LED grounding
●Simplified routing to/from LED Improved LED thermals
● Synchronous 3 MHz PWM boost converter, no external diode
●High Efficiency: 90% Peak
● Reduces high levels of input battery current during flash
● Limits battery current drain in torch mode
●I2C Programmable
● Currents up to 1500 mA in flash mode for one LED with ±7% accuracy over all conditions
● Currents up to 200 mA in torch mode
● Programmable dc battery current limit (4 settings)
● Programmable flash timer up to 1600 ms
● Low VBAT mode to reduce LED current automatically
● 4-bit ADC for LED VF, die/LED temperature readback
● See data sheet for additional features
