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Analog Devices MAX20751EKX+ — Analog & Data Acquisition

MAX20751EKX+ 4-Phase Buck Controller, PMBus, 300kHz–800kHz

MPNMAX20751EKX+
End of Life

Maxim Integrated MAX20751EKX+, 4-Output Step-Down (Buck) PWM Controller, PMBus Serial Interface, 300kHz–800kHz Switching Frequency, 1.71V–3.63V Supply, -40°C to +125°C, 36-QFN (6x6) Exposed Pad, Tray.

$10.79Ref. price · indicative, final on quote
Packaging36-VFQFN Exposed Pad
RoHSROHS3 Compliant
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

MAX20751EKX+ specifications
ParameterValue
Output typePWM Signal
MountingSurface Mount
Voltage - supply (Vcc (Vdd))1.71V ~ 3.63V
Frequency300kHz ~ 800kHz
I/O channels4
Output phases4
InterfacePMBus
Operating temperature-40°C ~ 125°C (TJ)
PackageTray
FunctionStep-Down
TopologyBuck
Clock syncNo
Case36-VFQFN Exposed Pad
Control featuresPhase Control, Power Good, Ramp
Output configurationPositive
Synchronous rectifierNo

Product details

4-phase buck controller with PMBus telemetry

The MAX20751EKX+ from Maxim Integrated is a 4-phase, 4-output step-down (buck) PWM controller designed for high-current processor core and memory rails. It integrates a PMBus serial interface for voltage margining, output current telemetry, and fault reporting.

Control features and output configuration

Control features include phase control for interleaving, a power-good output for sequencing, and a ramp signal for slope compensation. The output configuration is positive — the controller drives external N-channel MOSFETs in a standard buck topology. Synchronous rectification is not built in; the design uses external Schottky diodes or MOSFETs for the low-side rectifier.

Housed in a 36-pin VFQFN with exposed pad (6x6 mm body), the MAX20751EKX+ is surface-mount only. The supplier device package is 36-QFN (6x6).

Frequently asked questions

What is the MAX20751EKX+ switching frequency range?

The switching frequency is programmable from 300kHz to 800kHz. It is set by an external resistor and is not synchronized to an external clock.

Does MAX20751EKX+ have a replacement or equivalent?

No direct pin-compatible replacement or equivalent is listed in the official documentation. The part is currently active, so no successor has been designated. For a cross-shopping comparison, evaluate other 4-phase PMBus buck controllers from Maxim with the same 36-QFN footprint.

What is MAX20751EKX+'s listed function?

The function is a step-down (buck) PWM controller with four outputs and four phases. It uses a PMBus serial interface for control and telemetry.