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A3290KLHLX-T

P1-P3P4-P6P7-P9P10-P10
The A3290 and A3291 Hall-effect latches are extremely
temperature-stable and stress-resistant sensor ICs, especially
suited for operation over extended temperature ranges (up
to 125°C). Superior high-temperature performance is made
possible through dynamic offset cancellation, which reduces
the residual offset voltage normally caused by device package
overmolding, temperature dependencies, and thermal stress. The
two devices are identical except for their magnetic switchpoints.
They are not intended for automotive applications.
Both devices include, on a single silicon chip, a voltage regulator,
a Hall voltage generator, a small-signal amplifier, chopper
stabilization, a Schmitt trigger, and a short-circuit protected
open-drain output to sink up to 25 mA. A south polarity magnetic
field of sufficient strength is required to turn the output on. A
north polarity field of sufficient strength is necessary to turn
the output off. An onboard regulator permits operation with
supply voltages in the range of 3 to 24 V.
Two package styles provide a magnetically optimized package
for most applications: type LH is a miniature SOT23W low-
profile surface-mount package, and type UA is a three-pin
ultramini SIP for through-hole mounting. Both packages are
lead (Pb) free with 100% matte-tin leadframe plating.
A3290-DS, Rev. 17
MCO-0000307
• Symmetrical switchpoints
• Resistant to physical stress
• Superior temperature stability
• Output short-circuit protection
• Operation from unregulated supply
• Reverse battery protection
• Solid-state reliability
• Small package size
Chopper-Stabilized, Precision Hall-Effect Latches for
Consumer and Industrial Applications
Functional Block Diagram
A3290 and A3291
Amp
Regulator
Low-Pass
Filter
GND
VCC
OUT
Control
Current Limit
1Ω
Dynamic Offset
Cancellation
Sample and Hold
FEATURES AND BENEFITS DESCRIPTION
September 21, 2017
PACKAGES:
Not to scale
3-pin SOT23W
(suffix LH)
3-pin SIP,
matrix HD style
(suffix UA)
3-pin SIP,
chopper style
(suffix UA)
NOT FOR
NEW DESIGN
Chopper-Stabilized, Precision Hall-Effect Latches
for Consumer and Industrial Applications
A3290 and
A3291
2
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
SELECTION GUIDE
Part Number Packing
[1]
Package Type
Magnetic Switchpoints
[2]
Operate, B
OP
(G)
Release,
B
RP
(G)
A3290KLHLT-T 3000 pieces per 7-in. reel Surface-mount SOT23W
5 to 50 –50 to –5A3290KLHLX-T 10000 pieces per 13-in. reel Surface-mount SOT23W
A3290KUA-T
[3]
500 pieces per bulk bag Through-hole ultramini SIP
A3291KLHLT-T 3000 pieces per 7-in. reel Surface-mount SOT23W
10 to 100 –100 to –10A3291KLHLX-T 10000 pieces per 13-in. reel Surface-mount SOT23W
A3291KUA-T 500 pieces per bulk bag Through-hole ultramini SIP
[1]
Contact Allegro for additional packing options.
[2]
Algebraic convention used: (+) south polarity, (–) north polarity.
[3]
The chopper-style UA package is not for new design; the matrix HD style UA package is recommended for new designs.
Terminal List
Name
Number
Function
LH UA
VCC 1 1 Power supply
OUT 2 3 Output
GND 3 2 Ground
Package LH,
3-Pin SOT23W Pinout
Diagram
1 32
PTCT
1
2
3
PTCT
Package UA,
3-Pin SIP Pinout
Diagram
ABSOLUTE MAXIMUM RATINGS
Characteristic Symbol Notes Rating Units
Supply Voltage V
CC
26.5 V
Reverse Battery Voltage V
RCC
–30 V
Output Off Voltage V
OUT
26 V
Continuous Output Current I
OUT
Device provides internal current limiting to help protect itself
from output short circuits
25 mA
Reverse Output Current I
ROUT
–50 mA
Magnetic Flux Density B Unlimited G
Operating Ambient Temperature T
A
Range K –40 to 125 °C
Maximum Junction Temperature T
J
(max) 165 °C
Storage Temperature T
stg
–65 to 170 °C
SPECIFICATIONS
Chopper-Stabilized, Precision Hall-Effect Latches
for Consumer and Industrial Applications
A3290 and
A3291
3
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
ELECTRICAL CHARACTERISTICS: Over operating temperature range, unless otherwise noted
Characteristic Symbol Test Conditions Min. Typ.
[1]
Max Units
Supply Voltage Range
[2]
V
CC
Operating, T
J
< 165°C 3.0 – 24 V
Output Leakage Current I
OFF
V
OUT
= 24 V, B < B
RP
– – 10 µA
Output Saturation Voltage V
OUT(SAT)
I
OUT
= 20 mA, B > B
OP
– 185 500 mV
Output Current Limit I
ON
B > B
OP
30 – 60 mA
Power-On Time t
PO
V
CC
> 3.0 V – – 50 µs
Chopping Frequency f
C
– 800 – kHz
Output Rise Time t
R
R
LOAD
= 820 Ω, C
LOAD
= 20 pF – 0.2 2.0 µs
Output Fall Time t
F
R
LOAD
= 820 Ω, C
LOAD
= 20 pF – 0.1 2.0 µs
Supply Current I
CC
B < B
RP
, V
CC
= 12 V – 3.0 8.0 mA
B > B
OP
, V
CC
= 12 V – 4.0 8.0 mA
Reverse Battery Current I
RCC
V
RCC
= –20 V – – –5.0 mA
Zener Voltage V
Z
+ V
D
I
CC
= 15 mA, T
A
= 25°C 28 – – V
Zener Impedance Z
Z
+ Z
D
I
CC
= 15 mA, T
A
= 25°C – 50 – Ω
[1]
Typical data at T
A
= 25°C, 12 V.
[2]
Maximum V
CC
must be derated for power dissipation and junction temperature. See application information.
MAGNETIC CHARACTERISTICS
[3]
: Over V
CC
range, unless otherwise noted
Characteristic Symbol Test Conditions Min. Max. Units
Operate Point
[4]
B
OP
A3290
T
A
= 25°C and T
A(max)
5 50 G
T
A
= –40°C 5 50 G
A3291
T
A
= 25°C and T
A(max)
10 100 G
T
A
= –40°C 10 100 G
Release Point
[5]
B
RP
A3290
T
A
= 25°C and T
A(max)
–50 –5 G
T
A
= –40°C –50 –5 G
A3291
T
A
= 25°C and T
A(max)
–100 –10 G
T
A
= –40°C –100 –10 G
Hysteresis (B
OP
– B
RP
) B
HYS
A3290
T
A
= 25°C and T
A(max)
10 100 G
T
A
= –40°C – 100 G
A3291
T
A
= 25°C and T
A(max)
20 200 G
T
A
= –40°C – 200 G
[3]
The positive polarity symbol (+) indicates south magnetic eld, and the negative polarity symbol (–) indicates north magnetic eld.
[4]
Required polarity observed and transition of magnetic gradient through B
OP
. See functional description.
[5]
Required polarity observed and transition of magnetic gradient through B
RP
after B
OP
. See functional description.
P1-P3P4-P6P7-P9P10-P10

A3290KLHLX-T

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Buy A3290KLHLX-T
Manufacturer:
Description:
MAGNETIC SWITCH LATCH SOT23W
Lifecycle:
New from this manufacturer.
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