31109 MS 20080725-S00003 / 83100RM(KI) No.6202-1/5

http://onsemi.com

Semiconductor Components Industries, LLC, 2013

May, 2013

LB1868

Overview

The LB1868 is a 2-phase unipolar brushless motor driver. With only a few peripheral parts, lockup protection and

automatic recovery can be implemented. The IC can be configured for 12V or 24V operation and a wide range of

variations, from Low speed to H-High speed and from 60cm to 120cm square using the same PCB. This makes it easy

to design highly reliable fan motor installations.

Features

• Output protection Zener diode with variable withstand voltage

Z1, Z2 pins open: VOLM = 57V (24V specification)

Z1, Z2 pins shorted: VOLM = 32V (12V specification)

External Zener diode connected across Z1

− VCC pins: support for fans with large drive current

• External resistor allows configuration for 12V or 24V

• Direct Hall element connection possible (built-in Hall amplifier with hysteresis supports core without auxiliary electrode)

• Built-in output transistor with 1.0A output current (strengthened negative-current support for core without auxiliary

electrode)

• Built-in rotation detection function: Low during rotation and High during stop

• Built-in lockup protection with automatic recovery

• Built-in thermal shutdown

Specifications

Absolute Maximum Ratings at Ta = 25

°C

Parameter

Symbol

Conditions

Ratings

Unit

Maximum input current

ICC max

t

≤ 20ms

200

mA

Maximum applied output voltage

VOUT max

Internal

V

Maximum output current

IOUT max

1.0

A

Maximum current flowing into RD pin

IRD max

10

mA

Maximum RD applied voltage

VRD max

30

V

Allowable power dissipation

Pd max

1.1

W

Operating temperature

Topr

-30 to +95

°C

Storage temperature

Tstg

-55 to +150

°C

Monolithic Digital IC

2-phase Brushless

Fan Motor Driver

Ordering number : EN6202A

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating

Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.