The MAX8662/MAX8663 highly integrated PMICs are designed for use in smart cellular phones, PDAs, Internet appliances, and other portable devices. They integrate:

• a boost regulator driving two to seven white LEDs (MAX8662 only)
• two synchronous buck regulators
• a linear charger for a single-cell Li+ battery
• four low dropout (LDO) linear regulators

SPS (Smart Power Selector) 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 exceeds the current limit, supplemental current is taken from the battery.

Thermal limiting prevents overheating by reducing power drawn from the input source. Two step-down DC-DC converters achieve excellent light-load efficiency and have on-chip soft-start circuitry; 1MHz switching frequency allows for small external components. Four LDO linear regulators feature low quiescent current and operate from inputs as low as 1.7V. This allows the LDOs to operate from the stepdown output voltage to improve efficiency. The white LED driver features easy adjustment of LED brightness and open-LED overvoltage protection. A 1-cell Li+ charger has programmable charge current up to 1.25A
and a charge timer.

Smart Power Selector (SPS)
SPS seamlessly distributes power between the external input, the battery, and the system load. The
basic functions of SPS are:

- With both the external power supply and battery connected:

• a) When the system load requirements exceed the capacity of the external power input, the battery supplies supplemental current to the load
• b) When the system load requirements are less than the capacity of the external power input, the battery is charged with residual power from the input

- When the battery is connected and there is no external power input, the system is powered from
the battery

- When an external power input is connected and there is no battery, the system is powered from the external power input

Read more: MAX8662, MAX8663 - Power-Management ICs for Single-Cell, Li+ Battery-Operated Devices

Buy now PMICs and download free Datasheet from Farnell (24h delivery).