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

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

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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)

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

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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

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

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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.

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

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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

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

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

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