WM8325GEFL/RV

w WM8325 Processor Power Management Subsystem DESCRIPTION FEATURES The WM8325 is an integrated power-management subsystem which provides a cost-effective, flexible, single-chip solution for power management. It is specifically targeted at the requirements of a range of low-power portable consumer products, but is suitable to any application with a multimedia processor. The WM8325 is designed to operate as a system PMIC supporting the ARM9™, ARM11™ and ARM Cortex-A™ processors, but is also capable of supporting the majority of application and mobile processors at the heart of a wide range of low-power consumer multimedia applications. Power Management  1 x DC-DC synchronous buck converter (0.6V - 1.8V, 2.5A, DVS)  1 x DC-DC synchronous buck converter (0.6V - 1.8V, 1.25A, DVS)  2 x DC-DC synchronous buck converters (0.85V - 3.4V, 1A)   1 x LDO regulator (0.9V - 3.3V, 300mA, 1) 2 x LDO regulators (0.9V - 3.3V, 200mA, 1) The start-up behaviour and configuration is fully programmable in an integrated OTP non-volatile memory. This highly flexible solution helps reduce time-to-market, as changing application requirements can be very easily accommodated in the OTP. TM The InstantConfig interface enables an external EEPROM to configure the WM8325.   3 x LDO regulators (0.9V - 3.3V, 100mA, 2) 2 x Low-noise LDO regulators (1.0V - 3.5V, 200mA, 1)   2 x Low-noise LDO regulators (1.0V - 3.5V, 150mA, 2) 1 x ‘Alive’ regulator (0.8V – 1.55V, up to 25mA) The WM8325 power management subsystem comprises four programmable DC-DC converters and eleven LDO regulators (four of which are low-noise for supplying sensitive analogue subsystems). The integrated OTP bootstrap circuitry controls the start-up sequencing and voltages of the converters and regulators as well as the sequencing of system clocks.   I C or SPI compatible primary control interface Comprehensive interrupt scheme   Watchdog timer and system reset control Autonomous power sequencing and fault detection  OTP memory bootstrap configuration function The DC-DC converters deliver high performance and high efficiency across a wide range of operating conditions. They are optimised to support the high load current transients seen in modern processor core domains. DC-DC3 / DC-DC4 can be connected together and operated in ‘dual’ mode to support an increased current load of up to 1.6A An on-chip regulator provides power for always-on PMIC functions such as register map and the RTC. The device provides autonomous backup battery switchover. A low-power LDO is included to support ‘Alive’ processor power domains external to the WM8325. A 12-bit Auxiliary ADC supports a wide range of applications for internal as well as external analogue sampling, such as voltage detection and temperature measurement. WM8325 includes a crystal oscillator and an internal RC oscillator to generate all clock signals for autonomous system start-up and processor clocking. A Secure Real-time Clock (SRTC) and alarm function is included, capable of waking up the system from low-power modes. A watchdog function is provided to ensure system integrity. To maximise battery life, highly-granular power management enables each function in the WM8325 subsystem to be independently powered down through a control interface or alternatively through register and OTP-configurable GPIOs. The device offers a standby power consumption of 2.7V 200 mV ILOAD =100mA, VOUT 1.8V to 2.7V 250 ILOAD =100mA, VOUT < 1.8V 400 Undervoltage level Quiescent Current VOUT IQ VOUT Falling 88 % Normal mode, no load 30 A Low power mode, LDOn_LP_MODE=0, no load 10 Low power mode, LDOn_LP_MODE=1, no load Power Supply Rejection Ratio On Resistance (Switch mode) PSRR RDSON w 5 ILOAD = 1mA to 100mA IQ (no load) + 1% of load ILOAD = 50mA, = 1.71V mA % 0.025 %/V Load Regulation VOUT LOAD ILOAD =1mA to 200mA 0.003 %/mA Dropout Voltage VIN - VOUT ILOAD =100mA, VOUT =1.8V 95 mV ILOAD =100mA, VOUT =2.5V 65 ILOAD =100mA, VOUT =3.3V 60 Undervoltage level Quiescent Current VOUT IQ VOUT Falling 93 % Normal mode, no load 110 A Low Power mode, no load 70 ILOAD = 1mA to 200mA Power Supply Rejection Ratio Output noise voltage On Resistance (Switch mode) Current Limit (Switch mode) Start-up time Shutdown time PSRR VOUT RDSON IQ (no load) + 0.1% of load ILOAD = 100mA, = 1.71V MAX UNIT +2.5 % 0.025 %/V Load Regulation VOUT LOAD ILOAD =1mA to 150mA 0.004 %/mA Dropout Voltage VIN - VOUT ILOAD =100mA, VOUT =1.8V 135 mV ILOAD =100mA, VOUT =2.5V 100 ILOAD =100mA, VOUT =3.3V 90 Undervoltage level Quiescent Current Power Supply Rejection Ratio VOUT IQ PSRR Output noise voltage VOUT On Resistance (Switch mode) RDSON VOUT Falling Normal mode, no load 110 Low Power mode, no load 70 ILOAD = 1mA to 150mA IQ (no load) + 0.1% of load 73 ILOAD = 75mA, 10kHz 69 ILOAD = 75mA, 100kHz 49 f=10Hz to 100kHz; VOUT=2.8V, ILOAD = 1mA 30 f=10Hz to 100kHz; VOUT=2.8V, ILOAD = 10mA 32 Start-up time Shutdown time dB VRMS 32 VIN = 1.71V, ILOAD = 100mA 1000 VIN = 1.8V, ILOAD = 100mA 930 VIN = 2.5V, ILOAD = 100mA 610 VIN = 3.5V, ILOAD = 100mA 430 VOUT = 0V 250 tstart_up No load, Output cap 4.7 µF, 90% of VOUT 70 tshut_down No load, Output cap 4.7 µF, 10% of VOUT ICL A ILOAD = 75mA,