APW7502

5V/1.37A VCSEL and IR-LED Driver with I²C Interface

Features

• Wide Input Voltage from 2.7V to 5.5V
• Programmable LED Source Current up to 1.37A per 10mA/step
• Programmable LED Source Current Slew Rate 10mA/0.5µs to 10mA/64µs
• Bypass Mode for Standby Mode
• 40µA Operation Standby Current
• Programmable Ramp-up Time for IR-LED Current
• Support Dimming Frequency up to 5KHz
• 1MHz/2MHz Selectable Switching Frequency
• I²C Interface
• Short Circuit and Thermal Shutdown Protection
• Available in WLCSP 1.42x1.42-9
• Lead Free Green Devices Available (RoHS Compliant)

General Description
The APW7502 is a 5V/1.37A, 2MHz buck converter with a 7-bit current DAC to provide a well regulated current source for VCSEL and IR_LED applications. Through I²C interface, the start-up slew rate of the current source can be 8-segment adjustable and the regulated level can be adjusted too from 100mA to 1.37A in 10mA resolution. When the buck converter output is overloaded or short circuited, the device limits the current at a safety level to prevent catastrophic failure. The over-temperature protection shuts down the device when junction temperature reaches 150^oC and will automatically resume operating when junction temperature cools down by 20^oC. The cathode of the flash LED is referenced to GND, which improves thermal performance. The device is available in WLCSP 1.42x1.42-9 package.