Universal PMIC 3 Output Programmable Buck Regulator
Data Sheet


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.


  • 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
  • Third-Party Programming Support
  • Supported by Excel Configuration Tool
  • 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

Symbols & Footprints
Evaluation Board Schematics & Design Files


Pkg Code Details Quantities Dimensions PDF
TQFN32 4x4
  • JEDEC Reference:
  • MSL Pb-Free: L2 @ 260ᵒC
  • MSL SnPb Eutectic:
  • ThetaJA:
  • Bulk Pack Style: Tray
  • Quantity per Bulk Pack: 490
  • Quantity per Reel: 3000
  • Quantity per Tube:
  • Quantity per Tray: 490
  • Reel Size (Dia. x Width x Pitch): 330 x 12 x 8
  • Tape & Reel Unit Orientation: Quadrant 1
  • Dimensions: mm
  • Length: 4
  • Width: 4
  • Thickness: 0.8
  • Lead Pitch: 0.4

Parts & Purchasing

Part Number Pkg Code Min Temp Max Temp Status Buy Now Order Samples
XR77103ELB TQFN32 4x4 OBS
XR77103ELBTR TQFN32 4x4 -40 125 Active Order
XR77103EVB-DEMO-1 Board Active
Show obsolete parts
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.

Quality & Environmental Data

Part Number RoHS | Exempt RoHS Halogen Free REACH MSL Rating / Peak Reflow Package
XR77103ELBTR N Y Y Y L2 / 260ᵒC TQFN32 4x4

Click on the links above to download the Certificate of Non-Use of Hazardous Substances.

Additional Quality Documentation may be available, please Contact Support.
Distribution Date Description File
03/04/2019 Product Discontinuation Notice


Search our list of FAQs for answers to common technical questions.
For material content, environmental, quality and reliability questions review the Quality tab or visit our Quality page.
For ordering information and general customer service visit our Contact Us page.

Frequently Asked Questions

The best way to determine this is to go to maxlinear.com and type the part into the search function. At or near the top of the results you should see something that looks like:

In this example, we looked for XRA1201. Click on part number header or on the link at the bottom of the result.  This brings you to the product page. For example:


Click on Parts & Purchasing, highlighted with the blue arrow above. The screen changes to:


Notice the status column and the “Show obsolete parts” link.  A legend tells you the definition of the different statuses. Click on the “Show obsolete parts” link to see EOL or OBS part numbers along with the Active part numbers, the legend still present:


Another method to find out if a part is OBS or EOL is to click on SUPPORT at the top:


And then Product Change Notifications:


Type the part into the search, and click on one of the part numbers from the drop down menu. Then you can look for the Product Discontinuation Notice, which generally is at the top of the list, for example:


If you see this, it tells you that this particular orderable part has been discontinued and when the last order date is, or was. If you click on the file, then you can view the notice we sent about this if you purchased the part in the recent past. It may also advise of a replacement part. When an orderable part first becomes discontinued, Product Discontinuation Notices are sent are sent to those who have purchased the parts in the recent past, if purchased directly, with a dated opportunity to place a last order.

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