Micro PMU with 800 mA Buck, 300 mA LDO,Supervisory, Watchdog, and Manual ResetData SheetADP5043FEATURESGENERAL DESCRIPTIONInput voltage range: 2.3 V to 5.5 V The ADP5043 combines one high performance buck regulator One 800 mA buck regulator and one low dropout (LDO) regulator in a small 20-lead LFCSP One 300 mA LDO to meet demanding performance and board space requirements. 20-lead, 4 mm × 4 mm LFCSP package The high switching frequency of the buck regulator enables use Initial regulator accuracy: ±1% of tiny multilayer external components and minimizes board space. Overcurrent and thermal protection Soft start The MODE pin selects the buck’s mode of operation. When set Undervoltage lockout to logic high, the buck regulator operates in forced PWM mode. Open-drain processor reset with threshold monitoring When the MODE pin is set to logic low, the buck regulator ±1.5% threshold accuracy over the full temperate range operates in PWM mode when the load is around the nominal Guaranteed reset output valid to V value. When the load current falls below a predefined threshold, CC = 1 VDual watchdog for secure systems the regulator operates in power save mode (PSM) improving Watchdog 1 controls reset the light-load efficiency. Watchdog 2 controls reset and regulators power cycle The low quiescent current, low dropout voltage, and wide input Buck regulator key specifications voltage range of the ADP5043 LDO extend the battery life of Current-mode topology for excellent transient response portable devices. The LDO maintains a power supply rejection 3 MHz operating frequency of greater than 60 dB for frequencies as high as 10 kHz while Uses tiny multilayer inductors and capacitors operating with a low headroom voltage. Mode pin selects forced PWM or auto PFM/PSM modes Each regulator is activated by a high level on the respective 100% duty cycle low dropout mode enable pin. The ADP5043 is available with factory programmable LDO key specifications default output voltages and can be set to a wide range of options. Low VIN from 1.7 V to 5.5 V Stable with1 μF ceramic output capacitors The ADP5043 contains supervisory circuits that monitor High PSRR, 60 dB up to 1 kHz/10 kHz power supply voltage levels and code execution integrity in Low output noise microprocessor-based systems. The ADP5043 also provides Low dropout voltage: 150 mV at 300 mA load power-on reset signals. An on-chip dual watchdog timer can −40°C to +125°C junction temperature range reset the microprocessor or power cycle the system (Watchdog 2)