AH3768Q
Q
HIGH-VOLTAGE, LOW-SENSITIVITY
AUTOMOTIVE HALL-EFFECT LATCH
Description Pin Assignments
The AH3768Q is an AEC-Q100 qualified, high-voltage, low-sensitivity
Hall-Effect latch IC designed for brushless DC-motor commutation,
(Top View)
speed measurement, angular or linear encoders and position sensors
in automotive applications. To support wide range of demanding
3 OUTPUT
applications, the design is optimized to operate over the supply range
GND 2
of 3.0V to 28V. With chopper stabilized architecture and an internal
1 V
DD
bandgap regulator to provide temperature compensated supply for
internal circuits, the AH3768Q provides a reliable solution over the
whole operating range. For robustness and protection, the device has SOT23
a reverse blocking diode with a Zener clamp on the supply. The
output has an over current limit and a Zener clamp.
The single, open-drain output can be switched on with South pole of (Top View)
sufficient strength and switched off with North pole of sufficient
3. OUTPUT
strength. When the magnetic flux density (B) perpendicular to the
2. GND
package is larger than the operate point (B ) the output is switched
op
on (pulled low). The output is held latched until magnetic flux density
1. V
DD
reverses and becomes lower than the release point (B ).
rp
SIP-3
Features Applications
Bipolar Latch Operation (South Pole: On, North Pole: off) Brushless DC-Motor Commutation
High Sensitivity: B and B of +175G and -175G Typical Revolution Per Minute (RPM) Measurement
op rp
Single, Open-Drain Output with Overcurrent Limit Angular and Linear Encoder and Position Sensing and Indexing
3.0V to 28V Operating Voltage Range Flow Meters
Chopper Stabilized Design Provides Contactless Commutation, Speed Measurement and Angular
Superior Temperature Stability Position Sensing/Indexing in Automotive Applications
Minimal Switch Point Drift
Enhanced Immunity to Stress
Good RF Noise Immunity
Reverse Blocking Diode
Zener Clamp on Supply and Output Pins
-40C to +150C Operating Temperature
ESD: HBM 8kV, CDM: >2kV
AEC-Q100 Grade 0 Qualified
Industry Standard 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 Low-Pass Filter
Sample and
Hold
Dynamic Offset
Cancellation
AH3768Q
Q
Typical Applications Circuit
3.0V to 28V
V
DD
R
L
OUTPUT
AH3768Q
C
IN
GND
Note: 4. C is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 10nF ~ 100nF. R is the pull-up resistor.
IN L
Pin Descriptions
Package: SOT23 and SIP-3
Pin Number Pin Name Function
1 Power Supply Input
VDD
2 GND Ground
3 OUTPUT Output Pin
Functional Block Diagram
V
DD
Power
switch
To All Subcircuits
OUTPUT
Amp Amp
Control
Current
Limit
GND
2 of 13
AH3768Q July 2015
Diodes Incorporated
www.diodes.com
Document number: DS38077 Rev. 2 - 2
PRELIMINARY - CONFIDENTIAL