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Microchip Technology MCP19122-E/MJ — Discrete Semiconductors

Microchip MCP19122-E/MJ Digitally Enhanced Buck Controller

MPNMCP19122-E/MJ
End of Life

Microchip MCP19122-E/MJ, Automotive AEC-Q100, Digitally Enhanced Power Analog, Step-Down Buck Controller, 4.5V-40V supply, 100kHz-1.6MHz switching, I²C/PMBus/SMBus, PWM output, 24-QFN (4x4), -40°C to 125°C.

$5.58Ref. price · indicative, final on quote
Microchip Technology MCP19122-E/MJ datasheet (PDF)
Packaging24-VFQFN Exposed Pad
RoHSROHS3 Compliant
SeriesAutomotive, AEC-Q100
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

MCP19122-E/MJ specifications
ParameterValue
SeriesAutomotive, AEC-Q100
Output typePWM Signal
MountingSurface Mount
Voltage - supply (Vcc (Vdd))4.5V ~ 40V
Frequency100kHz ~ 1.6MHz
I/O channels1
Output phases2
InterfaceI²C, PMBus, SMBus
Operating temperature-40°C ~ 125°C (TA)
PackageTube
FunctionStep-Down
TopologyBuck
Clock syncYes
Case24-VFQFN Exposed Pad
Control featuresEnable, Frequency Control, Power Good, Soft Start, Watchdog
Output configurationPositive
Synchronous rectifierYes

Product details

AEC-Q100 buck controller with digital telemetry

It integrates a PMBus/I²C/SMBus serial interface that lets the system monitor and adjust the output voltage in real time — a step beyond a fixed-frequency analog controller. Input range spans 4.5 V to 40 V, covering 12 V and 24 V automotive buses with margin for load-dump transients.

Two-phase synchronous buck with watchdog

This is a single-output, two-phase synchronous buck controller. The two interleaved phases reduce input ripple and spread the thermal load across the power stage, which matters when the board has limited airflow or is potted in an ECU housing. Control features include enable, frequency control, power-good flag, soft-start, and a watchdog timer — the watchdog is a practical addition for safety-critical automotive loads where a stuck controller must trigger a system reset.

Frequently asked questions

What is the maximum switching frequency of the MCP19122-E/MJ?

The switching frequency is programmable from 100 kHz up to 1.6 MHz. The upper end allows the use of smaller inductors and capacitors, trading off some efficiency for board area.

Is MCP19122-E/MJ AEC-Q100 qualified?

Yes, the MCP19122-E/MJ is listed under the Automotive, AEC-Q100 series, meaning it has passed the stress tests required for automotive-grade qualification.

How can I order MCP19122-E/MJ or check availability?

The MCP19122-E/MJ is sourced to order through independent distribution. Submit an RFQ to confirm current pricing and availability — no stock-holding claim is made here.