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US90A / US91A

24V Hall IC Fan Driver

Features and Benefits

Application Examples

ꢀ Low cost

ꢀ 12V/24V fans

ꢀ High sensitivity Hall Sensor

ꢀ Peak current up to 500mA

ꢀ Locked rotor protection and auto-restart

ꢀ Power-efficient CMOS and power MOSFETs

ꢀ Built-in output protection clamping diode

ꢀ Integrated tachometer (US90A) or alarm (US91A) signal output

ꢀ 2-coil fan driver with FG/RD output in 4-pin VK / VA

and 8-pin narrow SOIC packages (all RoHS Compliant)

Ordering Information

Part No.

US90A

Temperature Code

E (-40°C to 85°C)

Package Code

VK (4-pin TO-92)

DC (8-pin narrow SOIC)

VA (4-pin TO-92 flat)

US91A

E (-40°C to 85°C)

VK (4-pin TO-92)

DC (8-pin narrow SOIC)

VA (4-pin TO-92 flat)

1 Functional Diagram

2 General Description

The US90A/91A is a one-chip solution for driving

two-coil brushless DC cooling fans.

Based on the advanced Melexis CMOS process,

the IC contains a Hall-effect sensor, dynamic

offset correction and low side output drivers.

Frequency Generator or Rotation Detection is

available. The open-drain output makes the

connectivity with any external interface such as

hardware monitoring or Super I/O IC easier.

These features are combined with the Melexis

patented no-V_DDdesign to fit the IC in small 4-pin

VK and VA package.

The device is also delivered in DC package for

automatic assembly.

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Page 1 of 12

Data Sheet

Apr/07

US90A / US91A

24V Hall IC Fan Driver

Table of Contents

1 Functional Diagram ........................................................................................................ 1

2 General Description........................................................................................................ 1

3 Glossary of Terms .......................................................................................................... 3

4 Absolute Maximum Ratings........................................................................................... 3

5 Pin Definitions and Descriptions................................................................................... 3

6 General Electrical Specifications .................................................................................. 4

7 Magnetic Specifications................................................................................................. 4

8 Driver Output vs Magnetic Pole..................................................................................... 4

9 Detailed General Description......................................................................................... 5

10 Unique Features............................................................................................................ 5

11 Performance Graphs .................................................................................................... 6

11.1 R_DSONvs T_J...................................................................................................................................................................... 6

11.2 R_DSONvs V_DD.................................................................................................................................................................. 6

11.3 Magnetic parameters vs T_J.................................................................................................................................. 6

11.4 Magnetic parameters vs V_DD............................................................................................................................... 6

11.5 I_DDvs T_J............................................................................................................................................................................. 6

11.6 I_DDvs V_DD......................................................................................................................................................................... 6

11.7 V_OLvs T_J........................................................................................................................................................................... 7

11.8 Power Dissipation vs. T_A....................................................................................................................................... 7

12 Application Information................................................................................................ 7

12.1 Typical application with pull-up resistor..................................................................... 7

12.2 Configuration for reverse voltage / ground hot-switch protection and enhanced ESD

module protection ............................................................................................................. 7

13 Application Comments................................................................................................. 7

14 Standard information regarding manufacturability of Melexis products with

different soldering processes........................................................................................... 8

15 ESD Precautions........................................................................................................... 8

16 Package Information..................................................................................................... 9

16.1 VK Package Information (4-pin TO92)......................................................................................................... 9

16.2 DC Package Information (8-pin narrow SOIC)..................................................................................... 10

16.3 VA Package Information (4-pin TO92 flat).............................................................................................. 11

17 Disclaimer.................................................................................................................... 12

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Data Sheet

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US90A / US91A

24V Hall IC Fan Driver

3 Glossary of Terms

Two-coil fan

A fan with two-coil windings where current alternates from 1 coil to the other

depending on the direction of the magnetic field.

Units of magnetic flux density :

MilliTesla (mT), Gauss

1mT = 10 Gauss

Voltage on the coils common node.

Current supplying the chip which flows through the coil connected to the

switched off output driver.

V_DD

I_DD

Peak output current

The current flowing in the coil at start-up, only limited by the coil resistance

R_COILand the output driver resistance R_DSON.

Continuous output current The current flowing in the coil when the fan is spinning normally.

Locked rotor

FG

RD

The state when the fan stopped spinning due to mechanical blockage.

Frequency generator or tachometer output

Rotation detection or alarm output

LFPM

Linear Feet Per Minute – Unit of airflow velocity

4 Absolute Maximum Ratings

Parameter

Symbol

V_DD

Value

30

Units

V

Fan Supply Voltage

Peak Output Current

I_OUTp

I_OUTc

I_{FG (RD)}

T_A

T_J

T_S

500

250

20

-40 to 85

125

mA

Continuous Output Current

FG / RD Output Current

Operating Temperature Range

Junction Temperature

Storage Temperature Range

Magnetic Flux Density

Table 1: Absolute maximum ratings

°C

mT

-55 to 150

Unlimited

B

Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute-maximum-

rated conditions for extended periods may affect device reliability.

5 Pin Definitions and Descriptions

Pin Name Pin number (VK) Pin number (DC) Pin number (VA)

Function

FG (RD)

OUT1

OUT2

GND

-

1

2

3

4

-

1

2

4

3

1

2

4

3

-

FG (RD) open drain output signal

Open Drain Coil Driver 1

Open Drain Coil Driver 2

Ground pin

5, 6, 7, 8

Not Connected

Table 2: Pin definitions and descriptions US90A (US91A)

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Data Sheet

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US90A / US91A

24V Hall IC Fan Driver

6 General Electrical Specifications

DC Operating Parameters T_A= 25^oC, V_DD= 24V (unless otherwise specified)

Parameter

Fan Supply Voltage

Supply Current

Output Saturation Voltage

Output Clamp Voltage

FG / RD Output Low Voltage

FG / RD Output Clamp Voltage

Symbol Test Conditions

Min

4.7⁽¹⁾

Typ

Max

30

4

Units

V

mA

mV

V

mV

V

µA

V_DD

I_DD

Operating, R_COIL= 50Ω

2

375

625

V_{DSON 1,2}I_OUT= 150mA

V_{DSON 1,2}I_OUT= 250mA

V_{OUT 1,2}

60

28

V_OL

I_OL= 10mA

250

500

10

V_CLAMP

FG / RD Output Leakage Current I_LEAK

V_FG(V_RD) = 18V

DC Thermal Resistance

VK Thermal Resistance

VA Thermal Resistance

Locked Rotor Period

Output Switching Delay

R_THja

T_ON

T_OFF

T_DELAY

One-sided PCB, zero LFPM

150

200

170

0.25

1.5

°C/Watt

S

us

“Dead time” when both drivers are off

200

Table 3: General electrical specifications

Note 1: The minimal value of VDD should be determined using the following equation: V_DD= 4.5V + R_COIL* I_DD

7 Magnetic Specifications

DC Operating Parameters T_A= 25^oC, V_DD= 24V (unless otherwise specified)

Parameter

Operate point

Symbol

B_OP

Test Conditions

Min

Typ

3

Max

6

Units

mT

Release point

Hysteresis

B_RP

B_HYST

-6

2

-3

6

mT

Table 4: Magnetic specifications

8 Driver Output vs Magnetic Pole

Parameter

North pole

Test Conditions

B < Brp – all packages

OUT1

High

OUT2

Low

South pole

B > Bop - all packages

Low

High

Table 5: Driver output vs. magnetic pole

Note 3: The magnetic pole is applied facing the branded side of the package

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Data Sheet

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US90A / US91A

24V Hall IC Fan Driver

9 Detailed General Description

The US90A/91A is a one-chip solution for driving two-coil brushless DC fans. Based on advanced Melexis

CMOS process, the IC contains a Hall-effect sensor, dynamic offset correction and low side output drivers.

The output drivers OUT1 and OUT2 are fully protected against switching transients. So there is no need for

an external zener diode to cut the high voltage spikes induced by the fan coils.

The US90A has an open-drain integrated tachometer FG output that follows the Hall signal.

In the US91A, the open-drain rotation detection output RD is active low during normal spinning of the motor.

It goes high when the flux switching frequency becomes too low, which means the motor is blocked.

10 Unique Features

The absence of a V_DDpin enables the two low side output drivers and FG/RD signal output to fit in a four-pin

VK package. The lack of a V_DDpin decreases also the probability to damage the chip due to reverse voltage

connection, using the coil resistance to limit the reverse current. In this condition, the total reverse current is

twice the peak current value of the fan used.

The built-in locked-rotor protection will automatically shut off the coil current when the rotor is mechanically

blocked, or the rotational speed drops below 60 RPM (4-pole rotor magnet). The fan will try to restart every

1.5 seconds until the obstruction is clear. The On / Off cycling reduces the average stall current to 1/7 normal;

this is enough to prevent overheating or damage to most fans. Both the US90A and US91A have this feature.

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Data Sheet

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US90A / US91A

24V Hall IC Fan Driver

11 Performance Graphs

11.1 R_DSONvs T_J

5

11.2 R_DSONvs V_DD

5

4

3

2

1

0

VDD = 5V

Tj = -40°C

Tj = 25°C

Tj = 125°C

VDD = 24V

4

3

2

1

0

-40

-20

0

20

40

60

80

100

120

0

2

4

6

8

10

12

14

16

18

20

22

24

26

28

30

Tj (°C)

VDD (Volts)

11.3 Magnetic parameters vs T_J

6

11.4 Magnetic parameters vs V_DD

6

Bop, Tj=25°C

Bop, Tj=125°C

Brp, Tj=125°C

Brp, Tj=-40°C

Bop, VDD=5V

Brp, VDD=5V

Bop, VDD=24V

Brp, VDD=24V

5

4

5

Brp, Tj=25°C

4

3

Bop, Tj=-40°C

3

2

1

0

-1

-2

-3

-4

-5

-6

-1

-2

-3

-4

-5

-6

-40

-20

0

20

40

60

80

100

120

0

2

4

6

8

10

12

14

16

18

20

22

24

26

28

30

Tj (°C)

VDD (Volts)

11.5 I_DDvs T_J

4

11.6 I_DDvs V_DD

4

Tj = -40°C

Tj = 25°C

Tj = 125°C

3.5

3

3.5

3

VDD = 5V

2.5

2

2.5

2

VDD = 24V

1.5

1

1.5

1

0.5

0

0.5

0

-40

-20

0

20

40

60

80

100

120

0

2

4

6

8

10

12

14

16

18

20

22

24

26

28

30

Tj (°C)

VDD (Volts)

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Data Sheet

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US90A / US91A

24V Hall IC Fan Driver

11.7 V_OLvs T_J

0.5

11.8 Power Dissipation vs. T_A

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0

VK - R_TH= 200°C/W - PD_MAX= 500mW

VA - R_TH= 170°C/W - PD_MAX= 588mW

DC - R_TH= 150°C/W - PD_MAX= 666mW

T_A= 25°C

0.4

0.3

0.2

0.1

0

VDD=5V ; Iol=10mA

VDD=24V ; Iol=10mA

T_Amax = 85°C

T_Jmax = 125°C

-40

-20

0

20

40

60

80

100

120

-40

-20

0

20

40

60

80

100

120

140

Tj (°C)

Ta (°C)

12 Application Information

12.1 Typical application with pull-up

resistor

12.2 Configuration for reverse voltage /

ground hot-switch protection and

enhanced ESD module protection

13 Application Comments

Figure 12.2 shows the application including several external protections.

The diode D_REVPROTbest protects the chip and fan coils for reverse voltage condition.

The capacitor C_BYPASSis recommended if the supply ground may be disconnected while running even though

the positive supply point is still connected. This capacitor provides a path to ground for the remaining energy

in the coil which has to be evacuated. Without it, the energy can flow from OUT1/OUT2 to the FG/RD driver,

without any limitation and may cause EOS damage.

Its value has to be tuned depending on the coils characteristics. Bigger inductance requires bigger capacitor.

The no-V_DDdesign enables ESD protection at fan module level to be easily improved. The fan coils prevent

and filter fast current stress on OUT1 and OUT2, resulting in better ESD protection. Adding the optional

capacitor C_OUTenhances the ESD protection of the logic output. Hence, the fan module is able to withstand

ESD stress at relatively high value without damage.

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Data Sheet

Apr/07

US90A / US91A

24V Hall IC Fan Driver

14 Standard information regarding manufacturability of Melexis

products with different soldering processes

Our products are classified and qualified regarding soldering technology, solderability and moisture sensitivity

level according to following test methods:

Reflow Soldering SMD’s (Surface Mount Devices)

•

IPC/JEDEC J-STD-020

Moisture/Reflow Sensitivity Classification for Nonhermetic Solid State Surface Mount Devices

(classification reflow profiles according to table 5-2)

EIA/JEDEC JESD22-A113

Preconditioning of Nonhermetic Surface Mount Devices Prior to Reliability Testing

(reflow profiles according to table 2)

Melexis Working Instruction 341901308

Wave Soldering SMD’s (Surface Mount Devices) and THD’s (Through Hole Devices)

•

EN60749-20

Resistance of plastic- encapsulated SMD’s to combined effect of moisture and soldering heat

EIA/JEDEC JESD22-B106 and EN60749-15

Resistance to soldering temperature for through-hole mounted devices

Melexis Working Instruction 341901309

Iron Soldering THD’s (Through Hole Devices)

•

EN60749-15

Resistance to soldering temperature for through-hole mounted devices

Melexis Working Instruction 341901309

Solderability SMD’s (Surface Mount Devices) and THD’s (Through Hole Devices)

•

EIA/JEDEC JESD22-B102 and EN60749-21

Solderability

Melexis Working Instruction 3304312

For all soldering technologies deviating from above mentioned standard conditions (regarding peak

temperature, temperature gradient, temperature profile etc) additional classification and qualification tests

have to be agreed upon with Melexis.

The application of Wave Soldering for SMD’s is allowed only after consulting Melexis regarding assurance of

adhesive strength between device and board.

For more information on the lead free topic please see quality page at our website:

http://www.melexis.com/quality.aspx

15 ESD Precautions

Electronic semiconductor products are sensitive to Electro Static Discharge (ESD).

Always observe Electro Static Discharge control procedures whenever handling semiconductor products.

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Data Sheet

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US90A / US91A

24V Hall IC Fan Driver

16 Package Information

16.1 VK Package Information (4-pin TO92)

1.55^+/-0.10

0.73^+/-0.10

5.22^+/-0.10

4.20^+/-0.10

3°⁺²(2X)

+2

5° (2X)

-1

Notes:

1. All dimensions are in millimeters

2. Package dimension exclude molding flash.

Mold flash shall not exceed 0.127mm.

+0.02

- 0.03

0.46

3. To preserve reliability, it is recommended to

have total lead length equal to 2.5mm minimum,

measured from the package line.

0.00

0.20

4. VK package is a pin through-hole package,

hence adapted for wave soldering process.

A reflow soldering process is not recommended

with VK package as it may seriously affect

device reliability.

Marking:

1^stLine : US90A (US91A) - Name of the device

2^ndLine : xxxx - Assembly lot number (4 last digits)

0.38^+/-0.03

1.27^+/-0.03

3.81^+/-0.03

+2

-1

5°

(2X)

0.30^+/-0.10

(2X)

3°⁺²

(2X)

Hall plate location

2.25

0.52

Notes:

1.05

1. All dimensions are in millimeters

2. Typical values

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Data Sheet

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US90A / US91A

24V Hall IC Fan Driver

16.2 DC Package Information (8-pin narrow SOIC)

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Data Sheet

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US90A / US91A

24V Hall IC Fan Driver

16.3 VA Package Information (4-pin TO92 flat)

1.10

1.20

5.38^+/-0.05

5.16^+/-0.08

4.30^+/-0.20

Notes:

1. All dimensions are in millimeters

0.61

0.66

0.24

0.29

1x45°(REF)

2. Package dimension exclude end flash

5°

5°(2X)

45°(TYP)

Marking:

Top Side:

0.30^+/-0.05

1 max

1^stLine : US90A (US91A) - Name of the device

2^ndLine : xxxxxx - Assembly lot number (last 6 digits)

0.40

0.60

Bottom Side:

yyww : yy = year

ww = week

+0.06

- 0.07

0.40^+/-0.05

0.25

1.27^+/-0.05

3.81^+/-0.05

5°(2x)

45°(2x)

5°(2x)

Hall plate location

2.69

0.33

Notes:

1. All dimensions are in millimeters

2. Typical values

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Data Sheet

Apr/07

US90A / US91A

24V Hall IC Fan Driver

17 Disclaimer

Devices sold by Melexis are covered by the warranty and patent indemnification provisions appearing in its

Term of Sale. Melexis makes no warranty, express, statutory, implied, or by description regarding the

information set forth herein or regarding the freedom of the described devices from patent infringement.

Melexis reserves the right to change specifications and prices at any time and without notice. Therefore, prior

to designing this product into a system, it is necessary to check with Melexis for current information. This

product is intended for use in normal commercial applications. Applications requiring extended temperature

range, unusual environmental requirements, or high reliability applications, such as military, medical life-

support or life-sustaining equipment are specifically not recommended without additional processing by

Melexis for each application.

The information furnished by Melexis is believed to be correct and accurate. However, Melexis shall not be

liable to recipient or any third party for any damages, including but not limited to personal injury, property

damage, loss of profits, loss of use, interrupt of business or indirect, special incidental or consequential

damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical

data herein. No obligation or liability to recipient or any third party shall arise or flow out of Melexis’ rendering

of technical or other services.

For the latest version of this document, go to our website at

www.melexis.com

Or for additional information contact Melexis Direct:

Europe and Japan:

Phone: +32 1367 0495

E-mail: sales_europe@melexis.com

All other locations:

Phone: +1 603 223 2362

E-mail: sales_usa@melexis.com

ISO/TS 16949 and ISO14001 Certified

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Data Sheet

Apr/07

型号:	US91A-EDC-AAA-000-RX
是否Rohs认证：	符合
生命周期：	Active
包装说明：	SOP, SOP8,.25
Reach Compliance Code：	compliant
HTS代码：	8542.39.00.01
风险等级：	5.6
模拟集成电路 - 其他类型：	BRUSHLESS DC MOTOR CONTROLLER
JESD-30 代码：	R-PDSO-G8
JESD-609代码：	e3
端子数量：	8
最高工作温度：	85 °C
最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP
封装等效代码：	SOP8,.25
封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE
峰值回流温度（摄氏度）：	260
电源：	24 V
认证状态：	Not Qualified
子类别：	Motion Control Electronics
最大供电电流 (Isup)：	4 mA
标称供电电压 (Vsup)：	24 V
表面贴装：	YES
技术：	CMOS
温度等级：	INDUSTRIAL
端子面层：	Matte Tin (Sn)
端子形式：	GULL WING
端子节距：	1.27 mm
端子位置：	DUAL
处于峰值回流温度下的最长时间：	NOT SPECIFIED
Base Number Matches：	1

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