Analog Devices Inc. ADP5320 Power Management Unit (PMU) is designed to meet the demanding performance and board space requirements for wearable applications. This PMU combines nine digitally adjustable regulators, a fuel gauge, a 12-bit ADC, 2KB of OTP memory, and anticounterfeit logic in a 42-ball. The regulators include 2x buck-boost, 1x buck regulator, 5x Low Dropout (LDO) regulators, and one low input LDO. This ADP5320 PMU operates from a 1.8V to 5.5V input supply voltage range that enables the device for use with multiple types of battery inputs. The PMU features a power-good monitor, watchdog power hard reset, and I2C interface with interrupt warning.

The ADP5320 PMU fuel gauge includes a precision 16-bit coulomb counter that integrates battery current flowing through the device. A 12-bit ADC is included to monitor battery voltage, output supply voltages, and junction temperature. The ADP5320 PMU buck-boost regulators are high efficiency, step up and step down regulators. This PMU operates from -10°C to 70°C temperature range. Typical applications include wearable medical applications, IoT applications, disposable sensor devices, and battery-powered devices.


  • 1.8V to 5.5V wide input supply voltage range
  • 5.1μA standby mode low quiescent current, including UVLO
  • 16-bit coulomb counter fuel gauge with integrated high-side current sensing resistor
  • 12-bit ADC to monitor battery voltage, output voltages, and junction temperature
  • Channels 1 and Channel 2:
    • 150mA low power buck-boost regulator
    • Selective buck, boost, or buck-boost operation
    • Selective hysteresis or Pulse-Width Modulation (PWM) mode
    • 50kHz to 225kHz selective PWM frequency
    • 2x programmable GPIOs for clock synchronization or fast stop switching input
  • Channel 3:
    • 150mA low power buck regulator
  • Channel 4 through Channel 6, and Channel 8:
    • 50mA low noise LDO and 1.65V to 5.5V input supply voltage range
  • Channel 7:
    • 50mA sink current LDO
  • Channel 9:
    • 50mA, low noise LDO, and 1V to 1.9V input supply voltage range
  • I2C interface with interrupt warning
  • 2KB OTP memory
  • Power-good monitor and watchdog power hard reset
  • UVLO, peak current-limit protection, and TSD protection
  • Integrated anticounterfeit logic module
  • 42-ball, 0.40mm pitch, and 2.880mm x 2.980mm WLCSP
  • -10°C to 70°C operating junction temperature range


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