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Power management for portables

WM8321 is a single chip power management IC for low-
power portable consumer applications; it has four programmable DC-DC synchronous buck converters, and eleven LDO regulators, four of which are low noise for supplying sensitive analogue subsystems. An integrated one-time programmable (OTP) memory controls the converter and regulator start-up sequencing and voltages, as well as the sequencing of GPIOs and system blocks. In addition to the OTP memory, the WM8321 features an “InstantConfig” Interface (ICE) which allows testing of multiple start-up sequences via an external EEPROM. Wolfson customised the chip’s package to provide optimal thermal performance, suitable for single side component placement on low-cost PCBs. The QFN package enables inexpensive four-layer printed circuit boards and allows you to use of large PCB tracks for the DC-DC converters, reducing parasitic components and improving transient performance and efficiency. Offering a standby power consumption of <7uA, the WM8321 also features a 12-bit auxiliary ADC which supports a wide range of applications for internal as well as external sampling, such as voltage detection and temperate measurement. There is also a secure real-time clock (S-RTC) and alarm function that can wake the system from low power modes.

Wolfson Microelectronics, www.wolfsonmicro.com/products/power_management/WM8321/