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Analog Devices MAX6620ATI+ — Discrete Semiconductors

MAX6620ATI+ I2C Fan Speed Controller, 3V-5.5V, 28-TQFN

MPNMAX6620ATI+
End of Life

Analog Devices MAX6620ATI+, I2C Fan Speed Controller, 4 High-Side Pre-Drivers, 3V to 5.5V Supply, -40°C to +125°C, 28-TQFN (5x5) Exposed Pad, Tube.

$7.04Ref. price · indicative, final on quote
Packaging28-WFQFN Exposed Pad
RoHSROHS3 Compliant
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

MAX6620ATI+ specifications
ParameterValue
MountingSurface Mount
Motor type - AC, DCBrushed DC
Voltage3V ~ 5.5V
InterfaceI²C
Operating temperature-40°C ~ 125°C (TA)
PackageTube
FunctionController - Speed
ApplicationsFan Controller
Case28-WFQFN Exposed Pad
Output configurationPre-Driver - High Side (4)

Product details

I2C fan speed controller for four independent channels

The MAX6620ATI+ from Analog Devices (formerly Maxim Integrated) is a dedicated fan speed controller that manages up to four brushed DC fans via an I2C interface. It outputs four high-side pre-driver signals to drive external N-channel MOSFETs, giving the system designer control over fan voltage and speed without burdening the main MCU with PWM generation or tachometer polling.

The four pre-driver outputs are high-side only, meaning each channel drives the gate of an external N-channel MOSFET that switches the fan's positive supply rail. The controller handles the closed-loop speed regulation and tachometer feedback decoding internally, so the external BOM per fan is just one MOSFET plus a few passives — no separate PWM generator or op-amp for tach signal conditioning. Pre-driver outputs drive external N-channel MOSFETs.

Frequently asked questions

Does MAX6620ATI+ work with 5V fans?

Yes. The supply range of 3V to 5.5V covers 5V operation directly. The high-side pre-driver outputs control external N-channel MOSFETs that switch the fan's positive rail, so the fan voltage is whatever you supply to the drain of the external FET — the controller itself runs on 3V to 5.5V.

Can MAX6620ATI+ replace EMC2101?

Both parts are I2C fan controllers, but the EMC2101 includes an integrated fan driver while the MAX6620ATI+ uses external N-channel MOSFETs. The replacement depends on your board's existing external FET stage and control register map — the evidence does not confirm direct compatibility.