MAX8662

The MAX8662 power-management ICs (PMICs) are efficient, compact devices suitable for smart cellular phones, PDAs, Internet appliances, and other portable devices. They integrate two synchronous buck regulators, a boost regulator driving two to seven white LEDs, four low-dropout linear regulators (LDOs), and a linear charger for a single-cell Li-ion (Li+) battery.

Features of the MAX8662 are:(1)two 95%-efficient 1MHz buck regulators:main regulator: 0.98V to VIN at 1200mA,core regulator: 0.98V to VIN at 900mA; (2)1MHz boost WLED driver:drives up to 7 white LEDs at 30mA (max),PWM and analog dimming control; (3)four low-dropout linear regulators:1.7V to 5.5V input range,15A quiescent current; (4)single-cell li+ charger:adapter or USB input,thermal-overload protection; (5)smart power selector (SPS):AC adapter/USB or battery source,charger-current and system-load sharing.When system load peaks exceed the external source capability, the battery supplies supplemental current. When system load requirements are small, residual power from the external power source charges the battery. A thermal-limiting circuit limits battery-charge rate and external power-source current to prevent overheating. The PMIC MAX8662 also allows the system to operate with no battery or a discharged battery.

The absolute maximum ratings of the MAX8662 can be summarized as:(1)operating temp:-40 to 85;(2)LX3 to GND:-0.3V to +33VV;(3)DC_ to GND:-0.3V to +9V;(4)VL to GND:-0.3V to +4V;(5)PG_ to GND:-0.3V to +0.3V;(6)storage temp:-65 to 150;(7)lead temperature (soldering, 10s):300.Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the MAX8662 at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.SPS circuitry offers flexible power distribution between an AC adapter or USB source, battery, and system load, and makes the best use of available power from the AC adapter/USB input. The battery is charged with any available power not used by the system load. If a system load peak of MAX8662 exceeds the current limit, supplemental current is taken from the battery. Thermal limiting prevents overheating by reducing power drawn from the input source.