Data Sheet, V1.5, Nov. 2007
Uni- and Bipolar Hall IC Switches for
Magnetic Field Applications
TLE4905L, TLE4935L,
TLE4945L, TLE4945-2L
Sensors
Never stop thinking.
Edition 2007-11
published by Infineon Technologies AG,
Am Campeon 1-12,
81726 München, Germany
© Infineon Technologies AG 2007.
All Rights Reserved.
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The information herein is given to describe certain components and shall not be considered as a guarantee of characteristics.
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We hereby disclaim any and all warranties, including but not limited to warranties of non-infringement, regarding circuits,
descriptions and charts stated herein.
Information
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please contact your nearest Infineon Technologies Office.
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P
Uni- and Bipolar Hall IC Switches for
Magnetic Field Applications
TLE4905L, TLE4935L,
TLE4945L, TLE4945-2L
Features
• Digital output signal
• For unipolar and alternating magnetic fields
• Large temperature range
• Temperature compensated magnetic performance
• Protection against reversed polarity
• Output protection against electrical disturbances
PG-SSO-3-2
-SSO-3-2
Type Marking Package
TLE4905L 05 L PG-SSO-3-2
TLE4935L 35 L PG-SSO-3-2
TLE4935-2L 35 2 PG-SSO-3-2
TLE4945L 45 L PG-SSO-3-2
TLE4945-2L 45 2 PG-SSO-3-2
TLE4905/35/45/45-2 L (Unipolar/Bipolar Magnetic Field Switches) have been designed
specifically for automotive and industrial applications. Reverse polarity protection is included onchip as is output protection against negative voltage transients.
Typical applications are position/proximity indicators, brushless DC motor commutation,
rotational indexing etc.
Data Sheet 1 2007-05
AEP01364
1.35
Center of
a
Pin Configuration
(view on branded side of component)
TLE4905L, TLE4935L, TLE4945L, TLE4945-2L
±0.1
Figure 1
Pin Definitions and Functions
Pin No. Symbol Function
1 V
S
Supply voltage
2 GND Ground
3
Q
Output
2.08
V
231
GND
sensitive are
Q
±0.1
S
Data Sheet 2 V1.5, 2007-11
TLE4905L, TLE4935L, TLE4945L, TLE4945-2L
Circuit Description
The circuit includes Hall generator, amplifier and Schmitt-Trigger on one chip. The internal
reference provides the supply voltage for the components. A magnetic field perpendicular to the
chip surface induces a voltage at the hall probe. This voltage is amplified and switches a Schmitttrigger with open-collector output. A protection diode against reverse power supply is integrated.
The output is protected against electrical disturbances.
Threshold
Generator
1
V
S
V
S
V
Ref
Hall-
Generator
3
Q
Amplifier
2
GND
Schmitt-
Trigger
Output
Stage
AEB01243
Figure 2 Block Diagram
Data Sheet 3 V1.5, 2007-11
TLE4905L, TLE4935L, TLE4945L, TLE4945-2L
Functional Description Unipolar Type TLE4905 (Figure 3 and 4)
When a positive magnetic field is applied in the indicated direction (Figure 3) and the turn-on
magnetic induction B
When the current is reduced, the output of the IC turns off (Release Point; Figure
Figure 3 Sensor/Magnetic-Field Configuration
is exceeded, the output of the Hall-effect IC will conduct (Operate Point).
OP
+
Branded Side
Ι
S
V
N
+
V
S
B
Q
-
AES01231
4).
B
OP
t
t
AED01420
Induction
Output Voltage
B
RP
0
V
Q
V
QH
V
QL
Figure 4 Switching Characteristics Unipolar Type
Data Sheet 4 V1.5, 2007-11
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