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AH3774 Datasheet

HIGH-VOLTAGE HIGH-SENSITIVITY HALL EFFECT LATCH

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AH3774 pdf
AH3774
HIGH-VOLTAGE HIGH-SENSITIVITY HALL EFFECT LATCH
Description
The AH3774 is a high-voltage, high-sensitivity Hall Effect Latch IC
designed for commutation of brushless DC motor, flow meters, linear
encoders and position sensors in industrial and consumer home
appliance 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 AH3774 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 over current limit and a Zener clamp.
Pin Assignments
(Top View)
GND 2
3 OUTPUT
1 VDD
SC59 and SOT23
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).
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.
(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 +40G and -40G Typical
Single Open Drain Output with Over Current 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
Equipments 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.
AH3774
Document number: DS37899 Rev. 1 - 2
1 of 14
www.diodes.com
September 2015
© Diodes Incorporated



Diodes Semiconductor Electronic Components Datasheet

AH3774 Datasheet

HIGH-VOLTAGE HIGH-SENSITIVITY HALL EFFECT LATCH

No Preview Available !

AH3774 pdf
Typical Applications Circuit
3.0V to 28V
VDD
RL
OUTPUT
CIN AH3774
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: SC59, SOT23 and SOT23
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
Current
Limit
AH3774
OUTPUT
GND
AH3774
Document number: DS37899 Rev. 1 - 2
2 of 14
www.diodes.com
September 2015
© Diodes Incorporated



Diodes Semiconductor Electronic Components Datasheet

AH3774 Datasheet

HIGH-VOLTAGE HIGH-SENSITIVITY HALL EFFECT LATCH

No Preview Available !

AH3774 pdf
AH3774
Absolute Maximum Ratings (Notes 5 & 6) (@TA = +25°C, unless otherwise specified.)
Symbol
VDD
VDDR
VOUT_MAX
IOUT
Supply Voltage (Note 6)
Reverse supply voltage
Output off voltage (Note 6)
Continuous output current
Characteristic
Value
32
-32
32V
60
Unit
V
V
V
mA
IOUT_R
B
PD
Ts
TJ
ESD
Reverse output current
Magnetic Flux Density
Package Power Dissipation
SIP-3
SC59 and SOT23
Storage Temperature Range
Maximum Junction Temperature
Electrostatic Discharge Withstand Capability - Human Body Model
-50
Unlimited
550
230
-65 to +165
150
6
mA
mW
°C
°C
kV
Notes:
5. Stresses greater than the “Absolute Maximum Ratingsspecified 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
mW
IOUT_OFF
IDD
IDD_R
tST
fc
td
tr
tf
IOCL
VZ
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 RL and load
capacitance dependent)
Output Falling Time
(Internal switch resistance and load
capacitance dependent)
Output Current Limit
Zener Clamp Voltage
Conditions
IOUT = 20mA, B > Bop
VOUT = 28V, B < Brp, Output Off
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
(Note 9)
RL =1kΩ, CL = 20pF
RL =1kΩ, CL = 20pF
B>Bop, (Note 10)
IDD = 5mA
Min Typ Max Unit
0.2 0.4 V
<0.1 10
µA
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
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 = +25°C, 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.
AH3774
Document number: DS37899 Rev. 1 - 2
3 of 14
www.diodes.com
September 2015
© Diodes Incorporated




Part Number AH3774
Description HIGH-VOLTAGE HIGH-SENSITIVITY HALL EFFECT LATCH
Maker Diodes
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