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AH5798

SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER

Diodes Incorporated. 

AH5798

SINGLE PHASE HALL EFFECT LATCH SMART

FAN MOTOR CONTROLLER

Description

Pin Assignments

The AH5798 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.

To help protect the motor coil, the AH5798 provides Rotor

Lock Protection which shuts down 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.

( Top View )

Vdd 1

5 FG

Vss 2

NC

O1 3

74 O2

SOT89-5L

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.

( Top View)

FG 1

5 Vdd

The AH5798 is available in space saving SOT89-5L and

thinner TSOT25 packages.

Features

• Supports single-coil full-wave DC fan drivers

• Built-in Hall sensor and input amplifier

• Operating Voltage: 1.8V to 5.5V

• 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 packages: SOT89-5L and TSOT25

• “Green” Molding Compound

Vss 2

O2 3

TSOT25

4 O1

Applications

• 3.3V / 5V Min. BLDC Cooling Fans

• Netbook/ Notebook BLDC fans

• Low Voltage/ Low Power BLDC Motors

AH5798

Document number: DS32001 Rev. 2 - 2

1 of 11

www.diodes.com

June 2010

© Diodes Incorporated

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