US891 datasheet(4/12 Pages) MELEXIS

4 / 12 page

US890 / US891

Two-Coil Fan Driver – High Output Current

3901000890

Page 4 of 12

Data Sheet

Rev 002

Sep/07

6 General Electrical Specifications

DC Operating Parameters TA = 25

oC, V

DD = 12V (unless otherwise specified)

Parameter

Symbol Test Conditions

Min

Typ

Max

Units

Fan Supply Voltage

VDD

Operating – RCOIL = 100Ω

2.6(1)

Supply Current

IDD

2.5

OUT1, OUT2 ON Resistance

RDSON 1,2

VDD = 5V, TA = 25°C, IOUT = 300mA

1.4

Ω

OUT1, OUT2 ON Resistance

RDSON 1,2

VDD = 5V, TJ = 125°C, IOUT = 300mA

1.8

2.5

Ω

OUT1, OUT2 Output Clamp Voltage

VOUT1,2

FG / RD Output Low Voltage

VOL

IOL = 4mA

0.33

0.5

FG / RD Output Clamp Voltage

VCLMP

FG / RD Output Leakage Current

ILEAK

VFG (VRD) = 5V

0.15

FG / RD Output Current Limit

IFGLIM

VFG (VRD) = 12V

Package Thermal Resistance

RTH

One-sided PCB, zero LFPM

200

°C/Watt

Locked Rotor Period

TON

VDD > 7V

0.25

Locked Rotor Period

TOFF

VDD > 7V

1.5

Locked Rotor Period

TON

VDD < 5.5V

0.37

0.53(2) 0.75

Locked Rotor Period

TOFF

VDD < 5.5V

2.25

3.2(2)

4.51

Output Switching Delay

TDELAY

“Dead time” when both drivers are off

µs

Table 3: Electrical specifications

Note 1: The minimal value of VDD should be determined using the following equation:

VDD =2.5V + RCOIL * IDD

Note 2: Typical values valid at 5.5V. The values increase at lower voltage to improve fan start-up reliability.

7 Magnetic Specifications

DC Operating Parameters TA = 25

oC, V

DD = 12V (unless otherwise specified)

Parameter

Symbol

Test Conditions

Min

Typ

Max

Units

Operate point

BOP

Release point

BRP

-6

Hysteresis

BHYST

4.5

Table 4: Magnetic specifications

8 Driver Output vs Magnetic Pole

Parameter

Test Conditions

OUT1

OUT2

North pole

B < Brp

High

Low

High

South pole

B > Bop

Low

High

Low

Table 5: Driver output vs magnetic pole

Note 1: The magnetic pole is applied facing the branded side of the package

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