Features and Benefits
- Small 6.4 mm × 7.2 mm solution
- 2.2 μH power inductor
- 92% peak efficiency
- Tx masking within 50 μs
- 2.1 A, 12 V power switch
- Pin-selectable interface: 2-bit logic or I2C
- Programmable flash and torch current
- Up to 200 mA in torch mode
- Up to 500 mA in flash mode
- Programmable indicator LED current up to 20 mA
- Programmable timer register: up to 820 ms flash timeout
- 2.75 V to 5.5 V input voltage range
- Low noise, 1.2 MHz PWM operation
- Safety features
- Interrupt output pin
- Fault condition register
- Short-circuit protection
- Output overvoltage protection
- Thermal overload protection
- Integrated current limit and soft start
- Small 3 mm × 3 mm, 16-lead LFCSP footprint
The ADP1653 is a very compact, high efficiency, high power, camera flash LED driver optimized for cellular phones. The high efficiency and dynamic LED current control of the device improve flash brightness and picture quality in dimly lit environments. Efficiency peaks at 92% and is higher than charge pump solutions over the Li-Ion battery range.
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.
- Camera-enabled cellular phones, smart phones
- Digital still cameras, camcorders, PDAs
Product Lifecycle Not Recommended for New Designs
This designates products ADI does not recommend broadly for new designs.
Evaluation Kits (1)
The evaluation system is composed of a motherboard and a daughterboard. The motherboard provides the I2C signals from the computer USB port and generates the I/O voltages and digital high and low signals for the daughterboard. For temperature measurement, the daughterboard can be either plugged directly into the motherboard or connected to the motherboard via the ribbon cable provided with the evaluation kit.
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.