MAX8834Y

The MAX8834Y flash driver integrates a 1.5A PWM DC-DC step-up converter and three programmable low-side, low-dropout LED current regulators.The step-up converter features an internal switching MOSFET and synchronous rectifier to improve efficiency and minimize external component count. An I2C interface of MAX8834Y provides flexible control of stepup converter output voltage setting, movie/flash mode selection, flash timer duration settings, and current regulator settings. The MAX8834Y operates down to 2.5V, making them future proof for new battery technologies.

Features of the MAX8834Y are:(1)2.5V to 5.5V operation range; (2)step-up DC-DC converter; (3)ramp and blink timers for indicator mode; (4)low-dropout voltage (130mV max) at 16mA; (5)GSM blank logic input; (6)MAXFLASH system lockup protection; (7)remote temperature sensor input; (8)open/short LED detection; (9)thermal shutdown protection; (10)20-bump, 0.5mm pitch, 2.5mm x 2.0mm WLP.The indicator current regulator includes programmable ramp and blink timer settings. A programmable input current limit, invoked using the GSMB control,reduces the total current drawn from the battery during PA transmit events. This ensures the flash current is set to the maximum possible for any given operating condition.Additionally, the MAX8834Y includes a MAXFLASH function that adaptively reduces flash current during low battery conditions to help prevent system undervoltage lockup.

The absolute maximum ratings of the MAX8834Y can be summarized as:(1)IN, OUT, NTC to AGND:-0.3V to +6.0V;(2)storage temperature range:-65 to +150;(3)VDD to AGND:-0.3V to +4.0V);(4)junction temperature:+150;(5)PGND, FGND to AGND:-0.3V to +0.3V;(6)continuous power dissipation:1410mW.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 GSMB input of MAX8834Y  is provided to allow the flash current to be momentarily reduced during a GSM transmit to reduce the peak current drawn from the battery. The input current of MAX8834Y limit ensures that the maximum possible output current is always provided, regardless of the input voltage and the LED forward voltages.