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ADP5043:  Micro-PMU with 0.8 A Buck, 300 mA LDO, Supervisory, Watchdog, and Manual Reset

Product Details

Product Status:Recommended for New Designs

The ADP5043 combines one high performance buck regulator and one low dropout regulators (LDO) 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.

The low quiescent current, low dropout voltage, and wide input voltage range of the ADP5043 LDOs extend the battery life of portable devices. The LDO maintain power supply rejection greater than 60 dB for frequencies as high as 10 kHz while operating with a low headroom voltage.

Each regulator is activated by a high level on the respective enable pin. The ADP5043 is available with factory programmable default output voltages and can be set to a wide range of options.

The ADP5043 contains supervisory circuits that monitor power supply voltage levels and code execution integrity in microprocessor-based systems. They also provide power-on reset signals. An on-chip dual watchdog timer can reset the microprocessor or power cycle the system (Watchdog 2) if it fails to strobe within a preset timeout period.


  • Input voltage range: 2.3V to 5.5V
  • One 0.8 A buck regulator
  • One 300 mA LDO
  • 20-lead, 4 mm x 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
    - Mode pin selects forced PWM or auto PFM/PSM modes
  • LDO key specifications
    - Low VIN from 1.7 V to 5.5 V
    - 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
  • Additional Buck specifications
    - Uses tiny multilayer inductors and capacitors
    - 100% duty cycle low dropout mode
  • Additional LDO Specifications
    - High PSRR, 60 dB PSRR up to 1 kHz/10 kHz
    - Stable with1 μF ceramic output capacitors


Title Content Type File Type
ADP5043: Micro PMU with 800 mA Buck, 300 mA LDO,Supervisory, Watchdog, and Manual Reset (Rev A, 11/2011) (pdf, 0) Data Sheets PDF
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ADIsimPower is a smart selector and a collection of downloadable tools that produce complete and optimized power designs. Schematic, bill of materials, and performance data are customized to your specific needs in minutes.
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Integrated Power Solutions for Xilinx FPGAs  (pdf, 2253 kB)
Combining multiple switching regulators and LDOs into a single package enables very small, flexible, highly efficient power management solutions for powering FPGAs.
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Integrated Power Solutions for Altera FPGAs  (pdf, 2460 kB) Solutions Bulletins PDF
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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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