Micro PMU - Analog Devices
Description
Data Sheet
Micro PMU with 0.
8 A Buck, Two 300 mA LDOs Supervisory, Watchdog, and Manual Reset
ADP5042
SUPERVISOR MICROPROCESSOR
08811-001
FEATURES
Input voltage range: 2.
3 V to 5.
5 V One 0.
8 A buck regulator Two 300 mA LDOs 20-lead, 4 mm × 4 mm LFCSP package Initial regulator accuracy: ±1% Overcurrent and thermal protection Soft start Undervoltage lockout Open drain processor reset with threshold monitoring ±1.
5% threshold accuracy over the full temperate range Guaranteed reset output valid to VCC = 1 V Dual watchdog for secure systems
Watchdog 1 controls reset Watchdog 2 controls reset and regulators power cycle Buck key specifications Current mode topology for excellent transient response 3 MHz operating frequency Uses tiny multilayer inductors and capacitors Mode pin selects forced PWM or auto PFM/PSM modes 100% duty cycle low dropout mode LDOs key specifications Low VIN from 1.
7 V to 5.
5 V Stable with1 μF ceramic output capacitors High PSRR, 60 dB PSRR up to 1 kHz/10 kHz Low output noise
110 μV rms typical output noise at VOUT = 2.
8 V Low dropout voltage: 150 mV at 300 mA load −40°C to +125°C junction temperature range
GENERAL DESCRIPTION
The ADP5042 combines one high performance buck regulator and two low dropout (LDO) regulators in a small 20-lead LFCSP to meet demanding performance and board space requirements.
The high switching frequency of the buck regulator enables use of tiny multilayer external components and minimizes the board space.
The MODE pin selects the buck mode of operation.
When set to logic high, the buck regulators operate in forced PWM mode.
When the MODE pin is set to logic low, the buck regulators operate in PWM mode when the load is around the nominal value.
When the load current falls below a predefined threshold the regulator operates in power save mode (PSM) improving the light load efficiency.
HIGH LEVEL BLOCK DIAGRAM
RFILT = 30Ω
VIN1 = 2.
3V TO 5.
5V
C5 4.
7µF
AVIN VIN1
ON
OFF
EN1
VIN2 = 1.
7V
TO 5.
5V
C1
1µF
VIN2
ON
OF...
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