AH5792

Single Phase 3V BLDC All-In-One Fan and Motor Driver

Datasheet

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Description

The AH5792 is a single chip solution for driving single-coil brush-less DC fans and motors. The AH5792 employs a bidirectional full bridge driver output stage for single coil fan motor applications. The device includes features such as Rotor Lock Protection with rotor lock detection and automatic self-restart to avoid damage to the coil when the rotor is blocked. The AH5792 also offers an externally control°C Tachometer (Frequency Generator Pin) open -drain output which makes it easier to connect with external interface such as hardware monitoring. The FG is half (1/2) the magnetic change frequency. The devices are packaged in SOT553 and SOT89-5L small outline packages for applications such as small motors like vibration motors or ultra thin cooling fans.

Feature(s)

Support single-phase full wave min fan driver

Built-in Hall sensor input amplifier

Low voltage startup ( V_DD = 1.8V )

Lock detection and automatic self-restart

Without external timing capacitor, Reduces the numbers of external component required

FG output

Low profile package : SOT553 and SOT89-5L

“Green” Molding Compound

Application(s)

3.3V / 5V Min. DC Fans (Eight Pole)

Low Voltage / BLDC Motors

Micro-Vibration Motors

Product Specifications

Product Parameters

Operating Voltage (V)	1.8 to 5 V
SupplyCurrent (mA)	3.5 mA
Average OutputDrive Current (mA)	200, 300 mA
Peak Output Current (mA)	400, 500 mA
Typical Total R_DS(ON)(NMOS and PMOS Combined)	3.3 @ 5V Ω
Operating Point Bop Gauss (Min)	10
Operating Point Bop Gauss (Typ)	25
Operating Point Bop Gauss (Max)	50
Release Point Brp Gauss (Min)	-50
Release Point Brp Gauss (Typ)	-25
Release Point Brp Gauss (Max)	-10
Soft-Switch	-
Speed Control	VDD
Lock Detect, Shut-Down and Auto Start	Yes
Frequency Generator (FG) and Rotation Detect	FG RD
Operating Ambient Temperature (°C)	-40 to 10 °C

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)