Universal PMIC 3 Output Programmable Buck Regulator


The XR77103 features three synchronous, wide input range, high efficiency buck converters. Each converter is digitally programmable requiring minimal external components thus providing the smallest size solution possible.

The converters can operate in 5V, 9V and 12V systems and have integrated power switches. The output voltage of each converter can be adjusted by programming the values in the VOUT setting registers through an I2C interface. The adjustable range is 0.8~6V with 50mV resolution. The output voltage can also be set externally using an external resistor divider. Output sequence among the outputs, soft-start time and the peak inductor current limit are also set through I2C.

The switching frequency of the converters can either be set with I2C or can be synchronized to an external clock. The switching regulators are designed to operate from 300kHz to 2.2MHz. Each converter operates in phase or out of phase according to the value in the phase setting register. This can minimize the input filter requirements.

XR77103 features a supervisor circuit that monitors each converter output. PGOOD pin is asserted once sequencing is done, all outputs are reported in regulation and the reset timer expires. The polarity of the signal is active high.

XR77103 also features a light load Pulse Skipping Mode (PSM). It is set through I2C. The PSM mode allows for a reduction on the input power supplied to the system when the host processor is in stand-by mode (low activity) mode.

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  • 4.5V to 14V wide input supply voltage range
  • Built-in MOSFET and synchronous rectifier
  • I2C programmable supplies
    • Output voltage (0.8~6V)
    • Power on sequence
    • Soft-start timing
    • Switching frequency (300kHz~2.2MHz)
    • Individual current limit
    • Optional power saving mode at light loads
  • Non Volatile Memory (NVM) with up to 10,000 times write operation
  • 0.8V, high accuracy reference (1%)
  • Current-mode control with simple compensation circuit
  • External synchronization
  • Power good
  • Protection
    • Thermal shutdown
    • Overvoltage transient protection
    • Overcurrent protection
  • PowerArchitect™ Design and Configuration Software
  • Evaluation Board, Demo Kit and Configuration Module (XCM) are available for evaluation and development purposes only
  • 32-pin, 4 x 4mm TQFN package
  • Pin-compatible non-programmable versions


  • Low power FPGA and DSP supplies
  • Video processor supplies
  • Home gateways
  • Telecommunications and infrastructure equipment
  • Industrial control and automation
  • Base stations, switches/routers

Design Tools

Evaluation Hardware and Software


Pkg Code Details Quantities Dimensions PDF

Parts & Purchasing

Part Number Pkg Code RoHS Min Temp Max Temp Status Buy Now Order Samples
XR77103EVB-DEMO-1 Board PRE
XR77XXEVB-XCM-V80 Board Active
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Part Status Legend
Active - the part is released for sale, standard product.
EOL (End of Life) - the part is no longer being manufactured, there may or may not be inventory still in stock.
CF (Contact Factory) - the part is still active but customers should check with the factory for availability. Longer lead-times may apply.
PRE (Pre-introduction) - the part has not been introduced or the part number is an early version available for sample only.
OBS (Obsolete) - the part is no longer being manufactured and may not be ordered.
NRND (Not Recommended for New Designs) - the part is not recommended for new designs.
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