XR76121

20A, 22V Synchronous Step-Down COT Regulator

Description

The XR76121 is a synchronous step-down regulator combining the controller, drivers, bootstrap diode and MOSFETs in a single package for point-of-load supplies. The XR76121 has a load current rating of 20A. A wide 5V to 22V input voltage range allows for single supply operation from industry standard 5V, 12V and 19.6V rails.

With a proprietary emulated current mode Constant On-Time (COT) control scheme, the XR76121 provides extremely fast line and load transient response using ceramic output capacitors. It requires no loop compensation, simplifying circuit implementation and reducing overall component count. The control loop also provides 0.1% load and 0.1% line regulation and maintains constant operating frequency. A selectable power saving mode, allows the user to operate in Discontinuous Mode (DCM) at light current loads thereby significantly increasing the converter efficiency.

A host of protection features, including overcurrent, over temperature, overvoltage, short-circuit, open feedback detect and UVLO, helps achieve safe operation under abnormal operating conditions.

The XR76121 is available in a RoHS-compliant, green/halogen-free space-saving 5mm x 6mm QFN package.

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Features

  • Controller, drivers, bootstrap diode and MOSFETs
    integrated in one package
  • 20A  step-down regulator
  • Wide 5.0V to 22V input voltage range
    • 3V to 22V PVIN with 5V bias
    • 4.5V to 5.5V single supply operation
    • ≥0.6V adjustable output voltage
  • Proprietary constant on-time control
    • No loop compensation required
    • Stable ceramic output capacitor operation
    • Programmable 70ns to 1μs on-time
    • Constant 200kHz to 1MHz frequency
  • Selectable CCM or CCM/DCM
    • CCM/DCM for high efficiency at light load
    • CCM for constant frequency at light load
  • Precision enable
  • Low impedance power good flag with unpowered
  • Programmable soft-start
  • 17-pin 5mm x 6mm QFN package
  • Pin compatible 15A regulator – XR76117

Application

  • Servers
  • Point-of-Load (POL) converters
  • Industrial control and automation
  • FPGA, DSP and processor supplies
  • Base stations, switches/routers
  • Telecommunications and Infrastructure equipment

Design Tools

Packaging

Pkg Code Details Quantities Dimensions PDF
QFN17 5x6
  • JEDEC Reference: MO220
  • MSL Pb-Free: L2 @ 260
  • MSL SnPb Eutectic:
  • ThetaJA: 30.2
  • Bulk Pack Style: Tray
  • Quantity per Bulk Pack: 490
  • Quantity per Reel: 3000
  • Quantity per Tube: N/A
  • Quantity per Tray: 490
  • Reel Size (Dia. x Width x Pitch): 330x12
  • Tape & Reel Unit Orientation: Quadrant 1
  • Dimensions:
  • Length: 5
  • Width: 6
  • Thickness: 0.90
  • Lead Pitch: 0.50

Parts & Purchasing

Part Number Pkg Code RoHS Min Temp Max Temp Status Buy Now Order Samples
XR76121EL-F QFN17 5x6 -40 125 Active
XR76121ELMTR-F QFN17 5x6 -40 125 Active
XR76121ELTR-F QFN17 5x6 -40 125 Active
XR76121EVB 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.
Distribution Date Description File
12/19/2016 Qualification of an alternate lead frame supplier, DCI. PCN 16-1146-01-02 DCI lead frame-1033.pdf