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AH3772 Datasheet

HIGH-SENSITIVITY HALL EFFECT LATCH

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AH3772 pdf
AH3772
HIGH-VOLTAGE, HIGH-SENSITIVITY HALL EFFECT LATCH
Description
The AH3772 is a high-voltage, high-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 AH3772
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 (BOP) the output is switched
on (pulled low). The output is held latched until magnetic flux density
reverses and becomes lower than the release point (BRP).
Pin Assignments
(Top View)
GND 2
3 OUTPUT
1 VDD
SOT23
(Top View)
SIP-3
3. OUTPUT
2. GND
1. VDD
Features
Bipolar Latch (South Pole: On, North Pole: off)
3.0V to 28V Operating Voltage Range
High Sensitivity: BOP and BRP of +25G and -25G 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
-40C 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
Contactless 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.
AH3772
Document number: DS38106 Rev. 1 - 2
1 of 13
www.diodes.com
September 2015
© Diodes Incorporated



Diodes Semiconductor Electronic Components Datasheet

AH3772 Datasheet

HIGH-SENSITIVITY HALL EFFECT LATCH

No Preview Available !

AH3772 pdf
Typical Applications Circuit
3.0V to 28V
VDD
AH3772
RL
OUTPUT
CIN AH3772
GND
Note:
4. CIN is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 10nF ~ 100nF. RL is the pull-up resistor.
Pin Descriptions
Package: SOT23 and SIP-3
Pin Number
1
2
3
Pin Name
VDD
GND
OUTPUT
Power Supply Input
Ground
Output Pin
Function
Functional Block Diagram
VDD
Power
switch
To All Subcircuits
Amp
Amp
Control
OUTPUT
Current
Limit
GND
AH3772
Document number: DS38106 Rev. 1 - 2
2 of 13
www.diodes.com
September 2015
© Diodes Incorporated



Diodes Semiconductor Electronic Components Datasheet

AH3772 Datasheet

HIGH-SENSITIVITY HALL EFFECT LATCH

No Preview Available !

AH3772 pdf
AH3772
Absolute Maximum Ratings (Notes 5 & 6) (@TA = +25°C, unless otherwise specified.)
Symbol
VDD
VDDR
VOUT_MAX
IOUT
IOUT_R
B
PD
Ts
TJ
ESD
Supply Voltage (Note 6)
Reverse Supply Voltage
Output Off Voltage (Note 6)
Continuous Output Current
Reverse Output Current
Magnetic Flux Density
Characteristic
Package Power Dissipation
Storage Temperature Range
Maximum Junction Temperature
Electrostatic Discharge Withstand Capability - Human Body Model
SIP-3
SOT23
Value
32
-32
32V
60
-50
Unlimited
550
230
-65 to +165
+150
6
Unit
V
V
V
mA
mA
mW
°C
°C
kV
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 VDD 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 (@TA = -40°C to +125°C, unless otherwise specified.)
Symbol
VDD
TA
Parameter
Supply Voltage
Operating Temperature Range
Operating
Operating
Conditions
Rating
3.0 to 28
-40 to +125
Unit
V
°C
Electrical Characteristics (Notes 7 & 8) (@TA = -40°C to +125°C, VDD = 3V to 28V, unless otherwise specified.)
Symbol
Parameter
Conditions
Min Typ Max Unit
mW
IOUT_OFF
Output On Voltage
Output Leakage Current
IOUT = 20mA, B > BOP
VOUT = 28V, B < BRP, Output off
-
0.2 0.4
V
-
<0.1
10
µA
IDD
IDD_R
tST
fc
td
tr
tf
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 RL and load
capacitance dependent)
Output Falling Time
(Internal switch resistance and load
capacitance dependent)
Output open, TA = +25C
Output open, TA = -40°C to +125°C
VDD = -18V, TA = -40°C to +125°C
VDD = -28V, TA = -40°C to +125°C
VDD >= 3V, B > BOP (Note 7)
VDD = 3V to 28V
(Note 9)
RL =1kΩ, CL = 20pF
RL =1kΩ, CL = 20pF
- 3 - mA
- - 4 mA
-
-0.01
1
mA
-
-0.01 1.5
mA
- 10 - µs
- 800 - kHz
- 3.75 -
µs
- 0.2 1 µs
- 0.1 1 µs
IOCL Output Current Limit
VZ Zener Clamp Voltage
B>BOP, (Note 10 )
IDD = 5mA
30 - 55 mA
28 - - V
Notes:
7. When power is initially turned on, VDD 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 TA = +25C, VDD = 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 IOUT to current limit of IOCL.
AH3772
Document number: DS38106 Rev. 1 - 2
3 of 13
www.diodes.com
September 2015
© Diodes Incorporated




Part Number AH3772
Description HIGH-SENSITIVITY HALL EFFECT LATCH
Maker Diodes
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