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부품번호 A1104 기능
기능 (A1101 - A1106) Continuous-Time Switch Family
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A1104 데이터시트, 핀배열, 회로
A1101, A1102, A1103, A1104, and A1106
Continuous-Time Switch Family
FEATURES AND BENEFITS
• AEC-Q100 automotive qualified
• Continuous-time operation
□Fast power-on time
□Low noise
• Stable operation over full operating temperature range
• Reverse battery protection
• Solid-state reliability
• Factory-programmed at end-of-line for optimum
performance
• Robust EMC performance
• High ESD rating
• Regulator stability without a bypass capacitor
Packages:
3-pin SOT23W (suffix LH)
3-pin SIP (suffix UA)
LH: A1101, A1102,
A1103, A1104, and
A1106
Not to scale
UA: A1101,
A1102, A1103,
and A1104
UA: A1106
DESCRIPTION
The AllegroA1101-A1104 and A1106 Hall-effect switches
are next generation replacements for the popular Allegro
312x and 314x lines of unipolar switches. The A110x family,
produced with BiCMOS technology, consists of devices that
feature fast power-on time and low-noise operation. Device
programming is performed after packaging, to ensure increased
switchpoint accuracy by eliminating offsets that can be induced
by package stress. Unique Hall element geometries and low-
offset amplifiers help to minimize noise and to reduce the
residual offset voltage normally caused by device overmolding,
temperature excursions, and thermal stress.
The A1101-A1104 and A1106 Hall-effect switches include
the following on a single silicon chip: voltage regulator, Hall-
voltage generator, small-signal amplifier, Schmitt trigger, and
NMOS output transistor. The integrated voltage regulator
permits operation from 3.8 to 24 V. The extensive on-board
protection circuitry makes possible a ±30 V absolute maximum
voltage rating for superior protection in automotive and
industrial motor commutation applications, without adding
external components. All devices in the family are identical
except for magnetic switchpoint levels.
The small geometries of the BiCMOS process allow these
devices to be provided in ultrasmall packages. The package
styles available provide magnetically optimized solutions for
most applications. Package LH is an SOT23W, a miniature low-
profile surface-mount package, while package UAis a three-lead
ultramini SIP for through-hole mounting. Each package is lead
(Pb) free, with 100% matte-tin-plated leadframes.
VCC
A1101-DS, Rev. 16
Regulator
To all subcircuits
Amp
VOUT
Gain
Offset
Trim
Control
Functional Block Diagram
GND




A1104 pdf, 반도체, 판매, 대치품
A1101, A1102, A1103,
A1104, and A1106
Continuous-Time Switch Family
MAGNETIC OPERATING CHARACTERISTICS1: over full operating voltage and ambient temperature ranges, un-
less otherwise noted
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max. Units
A1101
TA = 25°C
Operating Temperature Range
50 100 160 G
30 100 175 G
A1102
TA = 25°C
Operating Temperature Range
130 180 230 G
115 180 245 G
Operate Point
BOP
A1103
TA = 25°C
Operating Temperature Range
220 280 340 G
205 280 355 G
A1104
TA = 25°C
Operating Temperature Range
70 – 350 G
35 – 450 G
A1106
TA = 25°C
Operating Temperature Range
280 340 400 G
260 340 430 G
A1101
TA = 25°C
Operating Temperature Range
10 45 130 G
10 45 145 G
A1102
TA = 25°C
Operating Temperature Range
75 125 175 G
60 125 190 G
Release Point
BRP
A1103
TA = 25°C
Operating Temperature Range
165 225 285 G
150 225 300 G
A1104
TA = 25°C
Operating Temperature Range
50 – 330 G
25 – 430 G
A1106
TA = 25°C
Operating Temperature Range
180 240 300 G
160 240 330 G
A1101
TA = 25°C
Operating Temperature Range
20 55 80 G
20 55 80 G
A1102
TA = 25°C
Operating Temperature Range
30 55 80 G
30 55 80 G
Hysteresis
BHYS
A1103
TA = 25°C
Operating Temperature Range
30 55 80 G
30 55 80 G
A1104
TA = 25°C
Operating Temperature Range
20 55 – G
20 55 – G
A1106
TA = 25°C
Operating Temperature Range
70 105 140 G
70 105 140 G
1 Magnetic flux density, B, is indicated as a negative value for north-polarity magnetic fields, and as a positive value for south-polarity magnetic fields. This so-called alge-
braic convention supports arithmetic comparison of north and south polarity values, where the relative strength of the field is indicated by the absolute value of B, and the
sign indicates the polarity of the field (for example, a –100 G field and a 100 G field have equivalent strength, but opposite polarity).
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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A1104 전자부품, 판매, 대치품
A1101, A1102, A1103,
A1104, and A1106
Continuous-Time Switch Family
FUNCTIONAL DESCRIPTION
OPERATION
The output of these devices switches low (turns on) when a
magnetic field (south polarity) perpendicular to the Hall element
exceeds the operate point threshold, BOP. After turn-on, the output
is capable of sinking 25 mA and the output voltage is VOUT(SAT).
When the magnetic field is reduced below the release point,
BRP , the device output goes high (turns off). The difference in
the magnetic operate and release points is the hysteresis, Bhys, of
the device. This built-in hysteresis allows clean switching of the
output, even in the presence of external mechanical vibration and
electrical noise.
Powering-on the device in the hysteresis region, less than BOP and
higher than BRP, allows an indeterminate output state. The correct
state is attained after the first excursion beyond BOP or BRP.
CONTINUOUS-TIME BENEFITS
Continuous-time devices, such as the A110x family, offer the fast-
est available power-on settling time and frequency response. Due
to offsets generated during the IC packaging process, continuous-
time devices typically require programming after packaging to
tighten magnetic parameter distributions. In contrast, chopper-
stabilized switches employ an offset cancellation technique on
the chip that eliminates these offsets without the need for after-
packaging programming. The tradeoff is a longer settling time and
reduced frequency response as a result of the chopper-stabiliza-
tion offset cancellation algorithm.
The choice between continuous-time and chopper-stabilized
designs is solely determined by the application. Battery manage-
ment is an example where continuous-time is often required. In
these applications, VCC is chopped with a very small duty cycle
in order to conserve power (refer to figure 2). The duty cycle
is controlled by the power-on time, tPO, of the device. Because
continuous-time devices have the shorter power-on time, they are
the clear choice for such applications.
For more information on the chopper stabilization technique,
refer to Technical Paper STP 97-10, Monolithic Magnetic Hall
Sensing Using Dynamic Quadrature Offset Cancellation and
Technical Paper STP 99-1, Chopper-Stabilized Amplifiers with a
Track-and-Hold Signal Demodulator.
(A)
V+
VCC
0
B– 0
VOUT(SAT)
B+
(B)
VS
VCC
A110x VOUT
GND
RL
Output
BHYS
Figure 1: Switching Behavior of Unipolar Switches
On the horizontal axis, the B+ direction indicates increasing south polarity magnetic field strength, and the B– direction indicates decreasing
south polarity field strength (including the case of increasing north polarity). This behavior can be exhibited when using a circuit such as that
shown in Panel B.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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