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AM4951R (Obsolete)

Single Phase 12V BLDC Smart Fan and Motor Driver

Datasheet

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Description

The AM4951/R/2 series is a single-phase BTL output fan motor driver designed by bipolar process. This IC features high efficiency, silent operation and includes lock shutdown and automatic restart functions. When the motor is under lock condition, the lock shutdown function turns off the output current. When the lock condition is removed, the IC will restart automatically and allow DC fan to run. It is applied for high reliability and low noise application, such as personal computers, notebook, car audio, CPU cooling systems and power supplies in consumer electronics systems.

Feature(s)

BTL Output Single-phase Full-wave Linear Drive (Gain Resistor=1k to 360kΩ, Gain=51dB)

Support Low-voltage Drive and Feature a Wide Usable Voltage Range (2.2V to 24V)

Low Saturation Output (High Side and Low Side Saturation Voltage): VSAT_TOTAL=1.2V (typical, IOUT=200mA)

Built-in Lock Protection and Automatic Restart Circuits

Built-in FG/RD Output

Built-in Hall Sensor Bias (AM4952 Only, VHB=1.5V)

Thermal Protection Circuit

Small-sized, High Thermal Capacity Package

Application(s)

Notebook, Personal Computers

Power Supplies in Consumer Electronics, Car Audio and Office Peripherals

CPU Cooling Systems

Specifications & Technical Documents

Product Parameters

Average OutputDrive Current (mA)	N/A
Frequency Generator (FG) and Rotation Detect	RD
Hall Bias Voltage (V)	N/A
Lock Detect, Shut-Down and Auto Start	Yes
Operating Ambient Temperature (°C)	-40 to 105
Operating Voltage (V)	2.2 to 24
Other Protection Features	Thermal Shutdown
Peak Output Current (mA)	500
Reference Voltage Output (V)	N/A
Speed Control	VDD
Speed Control Slope Adjust	N/A
SupplyCurrent (mA)	5

Technical Documents

Recommended Soldering Techniques

TN1.pdf

Purchase & Availability

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-2770	2025-10-30	2025-10-30	Add Fab Site Code, Country of Diffusion (COD) and Assembly Site Origin (ASO) on Product and Shipping Labels for all Diodes Products