Diodes AM4951-R-2 User Manual

BTL Drive Single-phase Full-wave Fan Motor Driver AM4951/R/2

Data Sheet

General Description

The AM4951/R/2 series is a single-phase BTL output
fan motor driver designed by bipolar process. This IC
features high efficiency, silent operation and includes
lock shutdown and automatic restart functions. When
the motor is under lock condition, the lock
shutdown function turns off the output current. When
the lock condition is removed, the IC will
restart automatically and allow DC fan to run. It is
applied for high reliability and low noise application,
such as personal computers, notebook, car audio,
CPU cooling systems and power supplies in
consumer electronics systems.

The AM4951/R series is available in MSOP-8 (12V
application only) or PSOP-8 (24V application only)
package. The AM4952 is available in MSOP-10
package.

Features

• BTL Output Single-phase Full-wave Linear
Drive (Gain Resistor=1k to 360kΩ, Gain=51dB)

• Support Low-voltage Drive and Feature a Wide
Usable Voltage Range (2.2V to 24V)

• Low Saturation Output (High Side and Low Side

Saturation Voltage): V
I

=200mA)

OUT

• Built-in Lock Protection and Automatic Restart

Circuits

• Built-in FG/RD Output

• Built-in Hall Sensor Bias (AM4952 Only,
V

=1.5V)

HB

• Thermal Protection Circuit

• Small-sized, High Thermal Capacity Package

• FG Output (AM4951), RD Outpu t (AM4951R),

FG and RD Output (AM4952)

SAT_TOTAL

=1.2V (typical,

Applications

• Notebook, Personal Computers

• Power Supplies in Consumer Electronics, Car
Audio and Office Peripherals

• CPU Cooling Systems

MSOP-8 PSOP-8 MSOP-10

Figure 1. Package Types of AM4951/R/2

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Data Sheet

BTL Drive Single-phase Full-wave Fan Motor Driver AM4951/R/2

Pin Configuration

MM Package MP Package
(MSOP-8) (PSOP-8)

For AM4951/R 12V Application For AM4951/R 24V Application

MM Package

(MSOP-10)

For AM4952

Figure 2. Pin Configuration of AM4951/R/2 (Top View)

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Data Sheet

BTL Drive Single-phase Full-wave Fan Motor Driver AM4951/R/2

Functional Block Diagram

VCC

7 (8)

(2)

1 (1)

2 (3)

1.5V REG

4 (5)

OUT1

OUT2

6 (7)

HB

IN+

IN-

GND

5 (6)

A (B)
A for AM4951/R
B for AM4952

Figure 3. Functional Block Diagram of AM4951/R/2

Discharge Pulse

Control

Circuit

Charge Discharge

3 (4)

CT

8 (9)

8 (10)

FG

RD

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Data Sheet

BTL Drive Single-phase Full-wave Fan Motor Driver AM4951/R/2

Ordering Information

AM495 -

Circuit Type
1: AM4951

Package

MSOP-8

PSOP-8

MSOP-10 FG & RD

1R: AM4951R
2: AM4952

Package
MM: MSOP-8
MSOP-10
MP: PSOP-8

Temperature

Range

-40 to 105°C

Output

Signal

FG

RD

FG

RD

Part Number Marking ID

AM4951MM-G1 4951MM-G1 Tube
AM4951MMTR-G1 4951MM-G1 Tape & Reel
AM4951RMM-G1 4951RMM-G1 Tube
AM4951RMMTR-G1 4951RMM-G1 Tape & Reel
AM4951MP-G1 4951MP-G1 Tube
AM4951MPTR-G1 4951MP-G1 Tape & Reel
AM4951RMP-G1 4951RMP-G1 Tube
AM4951RMPTR-G1 4951RMP-G1 Tape & Reel
AM4952MM-G1 4952MM-G1 Tube
AM4952MMTR-G1 4952MM-G1 Tape & Reel

G1: Green

TR: Tape & Reel
Blank: Tube

Packing

Type

BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant
and green.

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Data Sheet

BTL Drive Single-phase Full-wave Fan Motor Driver AM4951/R/2

Absolute Maximum Ratings (Note 1, TA=25ºC)

Parameter Symbol

Supply Voltage VCC 28 V

Value

Unit

Peak Output Current I
FG/RD Pull-up Voltage VFG/VRD 28 V
FG/RD Output Current IFG/IRD 10 mA

Thermal Resistance
(Junction to Ambient)

Thermal Resistance
(Junction to Case)

Power Dissipation PD

Operating T em perature TOP -40 to 125 ºC
Storage Temperature T

500 mA

OUT

MSOP-8 205

θ

JA

θ

JC

-55 to 150 ºC

STG

PSOP-8 110

MSOP-10 195

MSOP-8 48

PSOP-8 36

MSOP-10 46

MSOP-8 585 mW

PSOP-8 960 mW

MSOP-10 585 mW

°C/W

°C/W

Note 1: Stresses greater than those listed under “Absolute Maximu m Ratings” may cause permanent damage to
the device. These are stress ratings only, and functional operation of the device at these or any other conditions
beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute
Maximum Ratings” for extended periods may affect device reliability.

Recommended Operating Conditions

Parameter Symbol Min Max Unit

Supply Voltage VCC 2.2 24 V
Hall Input Voltage V
Operating Ambient Temperature TA -40 105 ºC

0 VCC-1.5 V

ICM

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Data Sheet

BTL Drive Single-phase Full-wave Fan Motor Driver AM4951/R/2

Electrical Characteristics

VCC=12V, TA=25oC, unless otherwise specified.

Parameter Symbol Conditions Min Typ Max Unit

I

VCT=L 3 6 9 mA

Supply Current

CT Charge Current I

CC1

I

VCT=H 2.5 5 7.5 mA

CC2

0.9 1.3 1.5

CHG

µA

CT Discharge Current I
CT Charge/Discharge

Current Ratio

0.1 0.15 0.25

DHG

I

R

CT

CHG

/ I

6 8 10

DHG

µA

CT Clamp Voltage VCL 1.3 1.5 1.7 V
CT Comparator Voltage VCP 0.3 0.5 0.7 V
OUT Low Saturation Voltage V
OUT High Saturation Voltage V

SAT_L

SAT_H

I

OUT

I

OUT

=200mA 0.25 0.45 V
=200mA 0.95 1.2 V

Hall Input Sensitivity VHN 7 15 mV
FG Low Level Voltage

(For AM4951/2)
FG Leakage Current
(For AM4951/2)
RD Low Level Voltage
(For AM4951R/2)
RD Leakage Current
(For AM4951R/2)
HB Voltage
(For AM4952)

IFG=5mA 0.15 0.3 V

V

FG

VFG=15V 1 30

I

FGL

IRD=5mA 0.15 0.3 V

V

RD

VRD=15V 1 30

I

RDL

IHB=1mA 1.35 1.5 1.65 V

V

HB

µA

µA

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Data Sheet

BTL Drive Single-phase Full-wave Fan Motor Driver AM4951/R/2

Typical Performance Characteristics

9

8

7

6

5

(mA)

CC

I

4

3

2

1

I

(VCT=L)

CC1

I

(VCT=H)

CC2

=25oC

T

A

0 3 6 9 12 15 18 21 24

VCC (V)

12

10

I

TA (oC)

CC1

I

CC2

8

6

(mA)

CC

I

4

2

0

-50 -25 0 25 50 75 100 125

VCC=12V

(VCT=L)
(VCT=H)

Figure 4. Supply Current vs. Supply Voltage Figure 5. Supply Current vs. Ambient Temperatur e

1.6

V

SAT_H

V

SAT_L

I

(mA)

OUT

VCC=12V, TA=25oC

1.4

1.2

1.0

(V)

0.8

SAT

V

0.6

0.4

0.2

0.0
0 50 100 150 200 250 300 350 400

900

750

600

450

300

Power Dissipation (mW)

150

0

-50 -25 0 25 50 75 100 125 150

Package: MSOP-8/MSOP-10

TA (OC)

Figure 6. Saturation Voltage vs. Output Current Figure 7. Power Dissipation vs. Ambient Temperature

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Data Sheet

BTL Drive Single-phase Full-wave Fan Motor Driver AM4951/R/2

Typical Performance Characteristics (Continued)

1200

1050

900

750

600

(mW)

D

P

450

300

150

0

-50 -25 0 25 50 75 100 125 150

TA (oC)

Package: PSOP-8

Figure 8. Power Dissipation vs. Ambient Temperature

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Data Sheet

BTL Drive Single-phase Full-wave Fan Motor Driver AM4951/R/2

Typical Application

Note 2: Adding D1 can protect the IC from destruction by reverse connection. If D1 is used, it is necessary to
insert a capacitor C1 to provide a regenerative current route. Similarly, if there is no nearby capacitor on the fan
power supply line, C1 will also be necessary to improve reliability. Its capacity should be larger than 2.2µF.

Note 3: If the Hall sensor bias is taken from V
the value of R1 and R2 may achieve better startup characteristics and efficiency, even quiet operation.

Note 4: This pin must be left open if unused.
Note 5: If the line between Hall sensor output and Hall sensor input of IC is long, the noise may occur in this line.

But it can be eliminated by adding a capacitor C3.
Note 6: Each of R2, R3, R4 and R5 (AM4951/R only) is recommended to be 51kΩ typical. R1 is recommended

to be 2k and must be added when V
Note 7: The package of AH920 is SOT-23-3. If it is packaged in TO-92S-3，please exchange IN- with IN+.

is larger than 20V.

CC

Figure 9. Typical Application of AM4951/R

, A 1/2 VCC bias, as shown in the figure must be used. Adjusting

CC

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Data Sheet

BTL Drive Single-phase Full-wave Fan Motor Driver AM4951/R/2

Typical Application (Continued)

V

V

FG

RD

R1

R2

HB

RD
FG

D1

VCC

OUT2

HALL

IN+

C3

IN-

AM4952

CT

C2

OUT1

GND

L

C1

Figure 10. Typical Application of AM4952

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Data Sheet

BTL Drive Single-phase Full-wave Fan Motor Driver AM4951/R/2

Mechanical Dimensions

MSOP-8 Unit: mm(inch)

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Data Sheet

BTL Drive Single-phase Full-wave Fan Motor Driver AM4951/R/2

Mechanical Dimensions (Continued)

PSOP-8 Unit: mm(inch)

3.202(0.126)

3.402(0.134)

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Data Sheet

BTL Drive Single-phase Full-wave Fan Motor Driver AM4951/R/2

Mechanical Dimensions (Continued)

MSOP-10 Unit: mm(inch)

0.180(0.007)

0.280(0.011)

0.500(0.020)
TYP

)

)

7

9

8

9

1

1

.

.

0

0

(

(

0

0

5

5

7

0

.

.

4

5

)

)

1

6

0

0

0

0

.

.

0

0

(

(

0

0

2

2.900(0.114)

3.100(0.122)

5

1

0

.

.

0

0

0.400(0.016)

0.800(0.031)

)

)

4

2

1

2

1

1

.

.

0

0

(

(

0

0

0

0

9

1

.

.

2

3

0

°

6

°

0

9

0

.

0

0

3

2

.

0

)

4

0

0

.

0

(

)

9

0

0

.

0

(

5

0

0

.

7

0

.

0

9

5

0

.

8

2

0

.

1

0

0

1

)

(

0

.

0

0

3

0

.

0

3

7

)

(

(

0

.

0

3

2

)

4

3

)

(

0

.

0

Note: Eject hole, oriented hole and mold mark is optional.

Apr. 2012 Rev. 1. 4 BCD Semiconductor Manufacturing Limited

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BCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifi-

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