Quad Channel Digital Programmable Power Management System with Selectable DrMOS Output
Data Sheets OBS (Obsolete)


Information Quad Channel Digital Programmable Power Management System with Selectable DrMOS Output
# of Outputs 4
VIN MIN (V) 4.75
VIN MAX (V) 25
VOUT MIN (V) 0.6
VOUT MAX (V) 0.9*Vin
Set Point Resolution (mV) 2.5
Controller/ Regulator Controller
Gate Drive Pull Up/Down 4ohm / 2ohm
Internal MOSFETs No
IQ (mA) 4
Programmable Frequency Range (MHz) 0.1 to 1.2
Control Technology 17 bit DPWM/DPFM
NVM Technology Flash
Junction Temp Range (°C) -40 to 125
Package TQFN44
Special Features DrMOS Support, Expanded GPIO Options
PowerArchitect Version# 5
Additional Features XR7724 upgrade with the ability to drive MOSFETs and DrMOS
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The XR77128 is a quad channel Digital Pulse Width Modulated (DPWM) step-down (buck) controller. A wide 4.75V to 25V input voltage range allows for single supply operation from standard power rails.

With integrated FET gate drivers, two LDOs for standby power and a 105kHz to 1.23MHz independent channel-to-channel programmable constant operating frequency, the XR77128 reduces overall component count and solution footprint and optimizes conversion efficiencies. A selectable digital Pulse Frequency Mode (DPFM) capable of better than 80% efficiency at light current load and low operating current allow for portable and Energy Star compliant applications. Each XR77128 output channel is individually programmable as low as 0.6V with a resolution as fine as 2.5mV and configurable for precise soft-start and soft-stop sequencing, including delay and ramp control.

The XR77128 operation is fully controlled via a SMBus-compliant I2C interface allowing for advanced local and/or remote reconfiguration, full performance monitoring and reporting as well as fault handling.

Built-in independent output overvoltage, over temperature, overcurrent and undervoltage lockout protections insure safe operation under abnormal operating conditions.

The XR77128 is offered in a RoHS compliant, "green"/halogen free 44-pin TQFN package.

  • Quad channel step-down controller
    • Digital PWM 105kHz to1.23MHz operation
    • Individual channel frequency selection
    • Patented digital PFM with ultrasonic mode
    • Patented oversampling feedback
  • Pin compatible to XRP7724 with added features
    • Selectable DrMOS drive capability
    • Additional GPIO configurability
    • Current limit fault options
    • Additional conditional fault options
    • Improved output voltage accuracy
  • 4.75V to 25V input voltage
    • 4.75V to 5.5V and 5.5V to 25V input ranges
    • 0.6V to 5.5V output voltage
  • SMBus compliant - I2C interface
    • Full monitoring and reporting
  • 3 x 15V capable PSIO + 2 x GPIOs
  • Full start/stop sequencing support
  • Built-in thermal, overcurrent, UVLO and output overvoltage protections
  • Onboard 5V and 3.3V standby LDOs
  • Onboard non-volatile memory
  • Evaluation Board, Demo Kit and Configuration Module (XCM) are available for evaluation and development purposes only
  • Supported by PowerArchitect™ Design and Configuration Software
  • Third-Party Programming Support

  • Automotive infotainment
  • Industrial control systems
  • Audio systems
  • Automatic test equipment
  • Video surveillance systems

Documentation & Design Tools

Type Title Version Date File Size
Data Sheets XR77128 Quad Output Digital PWM/PFM Universal PMIC 1C January 2021 4 MB
Application Notes AN200, Downloading and Installing CAD Symbols and Footprints with Ultra Librarian April 2019 1.2 MB
User Guides & Manuals XRP77xxEVB-XCM-V62 (Configuration Module) 1.0.1 October 2017 880.5 KB
User Guides & Manuals XR77128 Evaluation Board Manual 1.0.0 December 2014 1.5 MB
Product Flyers Universal PMICs April 2019 2 MB
Product Brochures Power Management Brochure October 2020 2.4 MB
Symbols & Footprints XR77128ELB-F CAD File (.bxl) September 2018 209.1 KB
PowerArchitect PowerArchitect
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Quality & RoHS

Part Number RoHS | Exempt RoHS Halogen Free REACH TSCA MSL Rating / Peak Reflow Package
XR77128ELB-F N Y Y Y Y L3 / 260ᵒC TQFN44 7x7

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

Additional Quality Documentation may be available, please Contact Support.

Parts & Purchasing

Part Number Pkg Code Min Temp Max Temp Status Suggested Replacement PDN
XR77128ELB-F TQFN44 7x7 -40 125 OBS XRP7714ILBTR-F
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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.


Pkg Code Details Quantities Dimensions PDF
TQFN44 7x7
  • JEDEC Reference: MO-220
  • MSL Pb-Free: L3 @ 260ºC
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 30.2ºC/W
  • Bulk Pack Style: Tray
  • Quantity per Bulk Pack: 260
  • Quantity per Reel: 3000
  • Quantity per Tube: n/a
  • Quantity per Tray: 260
  • Reel Size (Dia. x Width x Pitch): 330 x 16 x 12
  • Tape & Reel Unit Orientation: Quadrant 1
  • Dimensions: mm
  • Length: 7.00
  • Width: 7.00
  • Thickness: 0.8
  • Lead Pitch: 0.50


Distribution Date Description File
03/05/2021 Product Discontinuation Notice
07/21/2017 Qualification of alternate assembly subcon, ANST.
07/11/2017 Product Discontinuation Notification

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The -F suffix indicates ROHS / Green compliance: