MAX8830

The MAX8830 light management IC integrates a 400mA (guaranteed) PWM DC-DC step-up converter, a 320mA white LED camera flash current sink, and four programmable LED current sinks. The internal 1MHz step-up converter MAX8830 features an internal switching MOSFET and synchronous rectifier to improve efficiency and minimize external component count. The camera flash output current and maximum timer of MAX8830 is programmable through I2C.Each LED current is individually regulated to a programmable level (from off to 10mA in 32 steps) and is completely independent of each other.

Features of the MAX8830 are:(1)400mA guaranteed output current; (2)over 90% efficiency; (3)on-chip FET and synchronous rectifier; (4)fixed 1MHz PWM switching; (5)open/short LED detection; (6)thermal-shutdown protection; (7)16-bump, 2.5mm x 2.5mm UCSP package; (8)flash LED current sink.The MAX8830 includes 10 comparators to detect open or shorted LEDs on the FLED and LED1LED4 pins.One comparator on each pin detects when the voltage falls below 100mV, indicating an open LED fault.Another comparator on each pin detects when the voltage rises above VOUT - 1V, indicating a shorted LED fault. The fault-detection comparators are enabled only when the corresponding current sink is enabled (and not set to zero current).

The absolute maximum ratings of the MAX8830 can be summarized as:(1)IN, OUT to GND:-0.3V to +6.0V;(2)storage temperature range:-65 to +150;(3)VDD to GND:-0.3V to +4.0V;(4)junction temperature:+150;(5)PGND to GND:-0.3V to +0.3V;(6)continuous power dissipation:750mW.Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied.Exposure to absolute maximum rating conditions for extended periods may affect device reliability.The MAX8830 includes a fixed-frequency, PWM step-up converter that supplies power to the LEDs and additional loads, such as audio amplifiers. The output voltage is programmable from 3.8V to 5.2V (in 100mV steps) through the I2C port. If the output voltage is not programmed,the step-up converter remains off; however, if any of the current regulators are programmed, the boost converter p-channel synchronous rectifier is turned on.