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AH3775

HIGH-VOLTAGE MEDIUM-SENSITIVITY HALL EFFECT LATCH

Description

The AH3775 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 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 AH3775

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

).

The magnetic operating and release polarity is opposite for SOT23

and SC59 packages. SOT23 and SIP-3 packages will require south

pole to the part marking side to operate while SC59 will require south

pole to the non-part marking side.

Pin Assignments

(Top View)

3 OUTPUT

GND 2

1 V

DD

SC59 and SOT23

(Top View)

3. OUTPUT

2. GND

1. V

DD

SIP-3

Features

•

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

3.0V

to 28V Operating

Voltage Range

Medium Sensitivity: B

OP

and B

RP

of +70G and -70G Typical

Single, Open-Drain Output with Overcurrent Limit

Chopper Stabilized Design Provides:

-

•

Superior Temperature Stability

Minimal Switch Point Drift

Enhanced Immunity to Stress

Applications

•

Brushless DC Motor Commutation

Revolution Per Minute (RPM) Measurement

Flow Meters

Angular and Linear Encoder and Position Sensors

Contactless Commutation, Speed Measurement and Angular

Position Sensing/Indexing in Consumer Home Appliances, Office

Equipments and Industrial Applications

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)

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.

AH3775

Document number: DS37900 Rev. 1 - 2

1 of 14

www.diodes.com

September 2015

AH3775

Typical Applications Circuit

3.0V to 28V

V

DD

R

L

C

IN

AH3775

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: SC59, 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

AH3775

Document number: DS37900 Rev. 1 - 2

2 of 14

www.diodes.com

September 2015

AH3775

Absolute Maximum Ratings

(Notes 5 & 6) (@T

A

= +25°C, unless otherwise specified.)

Symbol

V

DD

V

DDR

V

OUT_MAX

I

OUT

I

OUT_R

B

P

D

Ts

T

J

ESD

Notes:

Characteristic

Supply Voltage (Note 6)

Reverse Supply Voltage

Output off Voltage (Note 6)

Continuous Output Current

Reverse Output Current

Magnetic Flux Density

Package Power Dissipation

SIP-3

SC59 and SOT23

Value

32

-32

32V

60

-50

Unlimited

550

230

-65 to +165

+150

6

Unit

V

mA

mW

°C

kV

Storage Temperature Range

Maximum Junction Temperature

Electrostatic Discharge Withstand Capability - Human Body Model

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 28V

-40 to +125

Unit

V

°C

Electrical Characteristics

Symbol

V

OUT_ON

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 < Brp, 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 > Bop (Note 7)

V

DD

= 3V

to 28V

(Note 9)

Min

-

Typ

0.2

<0.1

2.7

-

-0.01

10

800

3.75

Max

0.4

10

3

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 10us 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

AH3775

Document number: DS37900 Rev. 1 - 2

3 of 14

www.diodes.com

September 2015

AH3775

Magnetic Characteristics

(Notes 11 &12) (T

A

= -40°C to +125°C, V

DD

= 3.0V to 28V, unless otherwise specified)

Symbol

B

OP

(South pole to part marking side for

SOT23 and SIP-3 packages;

South pole to the non-part marking side

for SC59 package. See diagram below)

B

RP

(North pole to part marking side for

SOT23 and SIP-3 packages;

North pole to the non-part marking side

for SC59 package. See diagram below)

Parameter

Conditions

V

DD

= 12V, T

A

= +25°C

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

-

50

-

-90

-

100

(1mT=10 Gauss)

Typ

Max

Unit

70

-70

140

-

90

-

Gauss

-50

-

180

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 is not tested in production

but guaranteed by design, process control and characterization

13. Maximum and minimum hysteresis is 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

(SC59)

(SOT23)

(SIP-3)

AH3775

Document number: DS37900 Rev. 1 - 2

4 of 14

www.diodes.com

September 2015

AH3775

Typical Operating Characteristics

Magnetic Operating Switch Points – B

OP

and B

RP

180.0

160.0

140.0

120.0

100.0

80.0

60.0

40.0

20.0

0.0

-20.0

-40.0

-60.0

-80.0

-100.0

-120.0

-140.0

-160.0

-180.0

2

T

A

= +25

o

C

Hyst

Bop

Brp

180.0

160.0

140.0

120.0

100.0

80.0

60.0

40.0

20.0

0.0

-20.0

-40.0

-60.0

-80.0

-100.0

-120.0

-140.0

-160.0

-180.0

-50

V

DD

= 3V

Hyst

Bop

Gauss (G)

Brp

4

6

8

10

12

14

16

18

20

22

24

26

28

30

-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

180.0

160.0

140.0

120.0

100.0

80.0

60.0

40.0

20.0

0.0

-20.0

-40.0

-60.0

-80.0

-100.0

-120.0

-140.0

-160.0

-180.0

-50

V

DD

= 12V

Hyst

Bop

Brp

180.0

160.0

140.0

120.0

100.0

80.0

60.0

40.0

20.0

0.0

-20.0

-40.0

-60.0

-80.0

-100.0

-120.0

-140.0

-160.0

-180.0

-50

V

DD

= 28V

Hyst

Bop

Gauss (G)

Brp

-25

0

25

50

75

100

125

150

-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

T

A

= +25 C

Supply Current I

DD

(mA)

4.0

3.8

3.5

28V

Supply Current I

DD

(mA)

4.0

3.0

3.3

3.0

2.8

2.5

2.3

3V

12V

2.0

1.0

0.0

2

4

6

8

10

12

14

16

18

20

22

24

26

28

30

2.0

-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

AH3775

Document number: DS37900 Rev. 1 - 2

5 of 14

www.diodes.com

September 2015

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