MAX8939

EVALUATION KIT AVAILABLE MAX8939/MAX8939A/MAX8939B System Power Management for Mobile Handset General Description The MAX8939/MAX8939A/MAX8939B power management ICs contain the necessary supplies and features for supporting cell phone designs based on the Intel Mobile Communications (IMC) 61XX 3G platform. Designed to power all peripheral components in the platform, the ICs also provide the necessary signals to control the 61XX baseband processor. The integrated lithium-ion (Li+) charger is protected up to 28V input and features a protected output voltage for supply of a USB transceiver. Proprietary thermalregulation circuitry limits the die temperature during fast-charging or when the ICs are exposed to high ambient temperatures, allowing maximum charging current without damaging the ICs. A dedicated current regulator is included for driving a charge indicator LED. Four programmable low-noise, low-dropout linear regulators (LDOs) provide the supply for noise sensitive peripherals. A high power vibrator driver is I2C programmable in 70 PWM levels and 4 output voltages. The ICs also offer two step-up converters; one high power, low voltage (5V) to supply an external audio amplifier or camera flash, and a high voltage (28V) supply for the display and keyboard backlight. Two integrated 25mA current regulators provide independent ramp-up and ramp-down control, programmable through I2C. The MAX8939/MAX8939A/MAX8939B are highly integrated ICs that require very few external compo...