Image shown is for reference only. Actual package may vary. Refer to the product data sheet for package details.

TSOT26.png

Image shown is for reference only. Actual package may vary. Refer to the product data sheet for package details.

U-DFN2020-6-Type-F.png

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AH5794 (Not Recommended for new design)

NRND = Not Recommended for New Design

Single Phase 3V/5V BLDC All-In-One Fan and Motor Driver with Low Rdson Softswitch and Thermal Shutdown

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Description

The AH5794 is a single chip solution for driving single-coil brushless direct current (BLDC) fans and motors. The integrated full-bridge driver output stage uses soft switching to minimize audible switching noise and electromagnetic interference (EMI) providing a low noise solution. Low operating voltage down to 1.8V allows motor speed to be control°C by varying the supply voltage. To help protect the motor coil, the AH5794 provides Rotor Lock Protection which shuts down the output drive if rotor lock is detected. The device automatically re-starts when the rotor lock is removed. Over temperature shutdown provides thermal protection for the device. A Tachometer output is provided by open-drain Frequency Generator (FG) Pin which allows external interface to monitor motor rotation or speed. The FG output is the magnetic change frequency.

Feature(s)

Supports single-coil full-wave BLDC fan drivers

Built-in Hall sensor and input amplifier

Operating voltage: 1.8V to 6V

VDD voltage speed control

Soft switching for low noise DC fan motor applications

Rotor Lock Protection (Lock detection, output shutdown and automatic re-start)

Thermal protection

Tachometer (FG) output

No external timing capacitor - Reduces the numbers of external components required

Low profile package: TSOT26 and U-DFN2020C-6

Halogen and Antimony free “Green” packages.

Lead Free Finish/ RoHS Compliant

Application(s)

3V/ 3.3V/ 5V BLDC Cooling Fans

Netbook/ Notebook BLDC fans

Instruments cooling fans

Low Voltage/ Low Power BLDC Motors

Product Specifications

Product Parameters

Average OutputDrive Current (mA)	1000
Frequency Generator (FG) and Rotation Detect	FG
Lock Detect, Shut-Down and Auto Start	-
Operating Ambient Temperature (°C)	-40 to 105
Operating Point Bop Gauss (Max)	50
Operating Point Bop Gauss (Min)	10
Operating Point Bop Gauss (Typ)	25
Operating Voltage (V)	1.8 to 6
Peak Output Current (mA)	300, 500
Release Point Brp Gauss (Max)	-10
Release Point Brp Gauss (Min)	-50
Release Point Brp Gauss (Typ)	-25
Soft-Switch	Yes
Speed Control	VDD
SupplyCurrent (mA)	2.2
Typical Total R_DS(ON)(NMOS and PMOS Combined)	1 @ 5V

Technical Documents

Recommended Soldering Techniques

TN1.pdf

Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN #	Issue Date	Implementation Date	Subject
PCN-2594	2022-08-31	2023-02-28	Device End of Life (EOL)