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AH3776

HIGH-VOLTAGE, HIGH-SENSITIVITY HALL EFFECT LATCH

Description

PRELIMINARY - CONFIDENTIAL

The AH3776 is a high-voltage, medium-sensitivity Hall Effect latch IC

designed for commutation of brushless DC motors, flow meters,

linear encoders and position sensors in industrial and consumer

home appliances and personal care applications. To support a wide

range of demanding applications, the design is optimized to operate

over the supply range of 3.0V to 28V. With chopper stabilized

architecture and an internal bandgap regulator to provide

temperature compensated supply for internal circuits, the AH3776

provides a reliable solution over the whole operating range. For

robustness and protection, the device has a reverse blocking diode

with a Zener clamp on the supply. The output has an overcurrent limit

and a Zener clamp.

The single, open-drain output can be switched on with South pole of

sufficient strength and switched off with North pole of sufficient

strength. When the magnetic flux density (B) perpendicular to the

package is larger than the operate point (B

OP

) the output is switched

on (pulled low). The output is held latched until magnetic flux density

reverses and becomes lower than the release point (B

RP

).

Pin Assignments

(Top View)

3 OUTPUT

GND 2

1 V

DD

SOT23

(Top View)

3. OUTPUT

2. GND

1. V

DD

SIP-3

Features

•

Bipolar Latch (South Pole: On, North Pole: off)

3.0V

to 28V Operating

Voltage Range

High Sensitivity: B

OP

and B

RP

of +110G and -110G Typical

Single, Open-Drain Output with Overcurrent Limit

Chopper Stabilized Design Provides

-

Superior Temperature Stability

-

Minimal Switch Point Drift

-

Enhanced Immunity to Stress

Good RF Noise Immunity

Reverse Blocking Diode and Zener Clamp on Supply

-40C to +125°C Operating Temperature

ESD (HBM): 6kV

Industry Standard SC59, SOT23 and SIP-3 Packages

Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)

Halogen and Antimony Free. “Green” Device (Note 3)

Applications

•

Brushless DC Motor Commutation

Revolution Per Minute (RPM) Measurement

Flow Meters

Angular and Linear Encoder and Position Sensors

Contact-less Commutation, Speed Measurement and Angular

Position Sensing/Indexing in Consumer Home Appliances, Office

Equipment and Industrial Applications

•

Notes:

1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"

and Lead-free.

3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and

<1000ppm antimony compounds.

AH3776

Document number: DS38230 Rev. 1 - 2

1 of 13

www.diodes.com

September 2015

AH3776

Typical Applications Circuit

3.0V to 28V

V

DD

PRELIMINARY - CONFIDENTIAL

R

L

C

IN

AH3776

OUTPUT

GND

Note:

4. C

IN

is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 10nF ~ 100nF. R

L

is the pull-up resistor.

Pin Descriptions

Package: SOT23 and SIP-3

Pin Number

1

2

3

Pin Name

V

DD

GND

OUTPUT

Power Supply Input

Ground

Output Pin

Function

Functional Block Diagram

V

DD

Power

switch

To All Subcircuits

Low-Pass Filter

Dynamic Offset

Cancellation

OUTPUT

Control

Sample and

Hold

Amp

Current

Limit

GND

AH3776

Document number: DS38230 Rev. 1 - 2

2 of 13

www.diodes.com

September 2015

AH3776

Absolute Maximum Ratings

(Notes 5 & 6) (@T

A

= +25°C, unless otherwise specified.)

Symbol

V

DD

Supply Voltage (Note 6)

Reverse Supply Voltage

Output Off Voltage (Note 6)

Continuous Output Current

Reverse Output Current

Magnetic Flux Density

Package Power Dissipation

Storage Temperature Range

Maximum Junction Temperature

Electrostatic Discharge Withstand Capability - Human Body Model

SIP-3

SOT23

Characteristic

Value

32

-32

32V

60

-50

Unlimited

550

230

-65 to +165

+150

6

Unit

V

mA

mW

°C

kV

PRELIMINARY - CONFIDENTIAL

V

DDR

V

OUT_MAX

I

OUT

I

OUT_R

B

P

D

Ts

T

J

ESD

Notes:

5. Stresses greater than the 'Absolute Maximum Ratings' specified above may cause permanent damage to the device. These are stress ratings only;

functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may be

affected by exposure to absolute maximum rating conditions for extended periods of time.

6. The absolute maximum V

DD

of 32V is a transient stress rating and is not meant as a functional operating condition. It is not recommended to

operate the device at the absolute maximum rated conditions for any period of time.

Recommended Operating Conditions

(@T

A

= -40°C to +125°C, unless otherwise specified.)

Symbol

V

DD

T

A

Parameter

Supply Voltage

Operating Temperature Range

Operating

Conditions

Rating

3.0 to 28

-40 to +125

Unit

V

°C

Electrical Characteristics

Symbol

mW

I

OUT_OFF

I

DD

I

DD_R

t

ST

f

c

t

d

(Notes 7 & 8) (@T

A

= -40°C to +125°C, V

DD

= 3V

to 28V, unless

otherwise specified.)

Conditions

I

OUT

= 20mA, B > B

OP

V

OUT

= 28V, B <

B

RP

, Output off

Output open, T

A

= +25C

Output open, T

A

= -40°C to +125°C

V

DD

= -18V, T

A

= -40°C to +125°C

V

DD

= -28V, T

A

= -40°C to +125°C

V

DD

>= 3V, B >

B

OP

(Note 7)

V

DD

= 3V

to 28V

(Note 9)

Min

-

Typ

0.2

<0.1

3

-

-0.01

10

800

3.75

Max

0.4

10

-

4

1

1.5

-

Unit

V

µA

mA

µs

kHz

µs

Parameter

Output ON Voltage

Output Leakage Current

Supply Current

Reverse Battery Current

Device Start-Up Time

Chopping Frequency

The time delay from magnetic

threshold reached to the start of the

output rise or fall

Output Rising Time

(external pull-up resistor R

L

and load

capacitance dependent)

Output Falling Time

(Internal switch resistance and load

capacitance dependent)

Output Current Limit

Zener Clamp Voltage

t

r

R

L

=1kΩ, C

L

= 20pF

-

0.2

1

µs

t

f

I

OCL

V

Z

Notes:

R

L

=1kΩ, C

L

= 20pF

B>B

OP

, (Note 10 )

I

DD

= 5mA

-

30

28

0.1

-

1

55

-

µs

mA

V

7. When power is initially turned on, V

DD

must be within its correct operating range (3.0V to 28V) to guarantee the output sampling. The output state is valid

after the start-up time of 10µs typical

from the operating voltage reaching 3V.

8. Typical values are defined at T

A

= +25C, V

DD

= 12V. Maximum and minimum values over the operating temperature range is not tested in production

but guaranteed by design, process control and characterization.

9. Guaranteed by design, process control and characterization. Not tested in production.

10. The device will limit the output current I

OUT

to current limit of I

OCL.

AH3776

Document number: DS38230 Rev. 1 - 2

3 of 13

www.diodes.com

September 2015

AH3776

Magnetic Characteristics

(Notes 11 &12) (T

A

= -40°C to +125°C, V

DD

= 3.0V to 28V, unless otherwise specified)

Symbol

Parameter

Conditions

V

DD

= 12V, T

A

= +25°C

B

OP

(South pole to part marking side)

Operation Point

T

A

= -40°C to +125°C

V

DD

= 12V, T

A

= +25°C

Release Point

T

A

= -40°C to +125°C

V

DD

= 12V, T

A

= +25°C

B

HY

(|B

OPX

|-|B

RPX

|)

Hysteresis (Note 13)

T

A

= -40°C to +125°C

Notes:

Min

-

80

-

-140

-

160

(1mT=10 Gauss)

Typ

Max

Unit

110

-110

220

-

140

-

Gauss

-80

-

280

PRELIMINARY - CONFIDENTIAL

B

RP

(North pole to part marking side)

11. When power is initially turned on, V

DD

must be within its correct operating range (3.0V to 28V) to guarantee the output sampling. The output state is

valid after the start-up time of 10µs typical

from the operating voltage reaching 3V.

12. Typical values are defined at T

A

= +25C, V

DD

= 12V. Maximum and minimum values over the operating temperature range are not tested in production

but guaranteed by design, process control and characterization.

13. Maximum and minimum hysteresis are guaranteed by design, process control and characterization.

Output

(off-state)

V

DD

( Output Voltage )

Bhy

Turn off

Turn on

(on-state)

V

OUT_ON

= V

OUT(SAT)

Brp

0

Bop

( Magnetic Flux Density B )

S

Part mark

S

Part mark

N

(SOT23)

(SIP-3)

AH3776

Document number: DS38230 Rev. 1 - 2

4 of 13

www.diodes.com

September 2015

AH3776

Typical Operating Characteristics

Magnetic Operating Switch Points – B

OP

and B

RP

PRELIMINARY - CONFIDENTIAL

300.0

250.0

200.0

150.0

100.0

50.0

0.0

-50.0

T

A

= +25

o

C

Hyst

Bop

300.0

250.0

V

DD

= 3V

Hyst

Bop

200.0

150.0

100.0

50.0

0.0

-50.0

Brp

Gauss (G)

-100.0

-150.0

Brp

-200.0

-250.0

-300.0

2

4

6

8

10

12

14

16

18

20

22

24

26

28

30

Gauss (G)

-100.0

-150.0

-200.0

-250.0

-300.0

-50

-25

0

25

50

75

100

125

150

Supply Voltage (V)

Switch Points Bop and Brp vs Supply Voltage

Temperature (

o

C)

Switch Points Bop and Brp vs Temperature

300.0

250.0

V

DD

= 12V

Hyst

Bop

300.0

250.0

V

DD

= 28V

Hyst

Bop

200.0

150.0

100.0

50.0

0.0

-50.0

Brp

200.0

150.0

100.0

50.0

0.0

-50.0

Brp

Gauss (G)

-100.0

-150.0

-200.0

-250.0

-300.0

-50

-25

0

25

50

75

100

Gauss (G)

-100.0

-150.0

-200.0

-250.0

-300.0

125

150

-50

-25

0

25

50

75

100

125

150

Temperature (

o

C)

Switch Points Bop and Brp vs Temperature

Temperature (

o

C)

Switch Points Bop and Brp vs Temperature

Supply Current

5.0

4.0

T

A

= +25 C

Supply Current I

DD

(mA)

Supply Current I

DD

(mA)

3.8

3.5

28V

4.0

3.0

3.3

3.0

2.0

2.8

2.5

2.3

2.0

3V

12V

1.0

0.0

2

4

6

8

10

12

14

16

18

20

22

24

26

28

30

-50 -40 -30 -20 -10

0

10 20 30 40 50 60 70 80 90 100 110 120 130

Supply Voltage (V)

Supply Current vs Supply Voltage

Temperature (

o

C)

Supply Current vs Temperature

AH3776

Document number: DS38230 Rev. 1 - 2

5 of 13

www.diodes.com

September 2015

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