A1101_08 [ALLEGRO]
Continuous-Time Switch; 连续时间开关
| 型号： | A1101_08 |
| 厂家： | 
ALLEGRO MICROSYSTEMS |
| 描述： | Continuous-Time Switch |
| 文件： | 总12页 (文件大小：304K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
A1101, A1102, A1103, A1104, and A1106
Continuous-Time Switch Family
Features and Benefits
▪ Continuous-time operation
▫ Fast power-on time
Description
The Allegro® A1101-A1104 and A1106 Hall-effect switches
are next generation replacements for the popular Allegro
312x and 314x lines of unipolar switches. The A110x family,
▫ 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
produced with BiCMOS technology, consists of devices that
feature fast power-on time and low-noise operation. Device
programmingisperformedafterpackaging,toensureincreased
switchpointaccuracybyeliminatingoffsetsthatcanbeinduced
by package stress. Unique Hall element geometries and low-
offset amplifiers help to minimize noise and to reduce the
residualoffsetvoltagenormallycausedbydeviceovermolding,
temperature excursions, and thermal stress.
▪ High ESD rating
▪ Regulator stability without a bypass capacitor
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
andindustrialmotorcommutationapplications,withoutadding
Packages: 3 pin SOT23W (suffix LH), and
3 pin SIP (suffix UA)
Continued on the next page…
Not to scale
Functional Block Diagram
VCC
Regulator
To all subcircuits
VOUT
Amp
Gain
Offset
Trim
Control
GND
A1101-DS, Rev. 3
A1101, A1102, A1103,
A1104, and A1106
Continuous-Time Switch Family
Description (continued)
external components.All devices in the family are identical except
provide magnetically optimized solutions for most applications.
Package LH is an SOT23W, a miniature low-profile surface-mount
package,whilepackageUAisathree-leadultraminiSIPforthrough-
hole mounting. Each package is lead (Pb) free, with 100% matte
tin plated leadframes.
for magnetic switchpoint levels.
The small geometries of the BiCMOS process allow these devices
to be provided in ultrasmall packages. The package styles available
Selection Guide
Part Number
A1101ELHLT-T
A1101EUA-T
A1101LLHLT-T
A1101LUA-T
A1102ELHLT-T
A1102EUA-T
A1102LLHLT-T
A1102LUA-T
A1103ELHLT-T
A1103EUA-T
A1103LLHLT-T
A1103LUA-T
A1104ELHLT-T
A1104EUA-T
A1104LLHLT-T
A1104LUA-T
A1106ELHLT-T
A1106EUA-T
A1106LLHLT-T
A1106LUA-T
Packing*
Mounting
Ambient, TA
BRP (Min)
BOP (Max)
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
3-pin SOT23W surface mount
3-pin SIP through hole
–40ºC to 85ºC
10
175
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
3-pin SOT23W surface mount
3-pin SIP through hole
–40ºC to 150ºC
–40ºC to 85ºC
–40ºC to 150ºC
–40ºC to 85ºC
–40ºC to 150ºC
–40ºC to 85ºC
–40ºC to 150ºC
–40ºC to 85ºC
–40ºC to 150ºC
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
3-pin SOT23W surface mount
3-pin SIP through hole
60
150
25
245
355
450
430
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
3-pin SOT23W surface mount
3-pin SIP through hole
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
3-pin SOT23W surface mount
3-pin SIP through hole
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
3-pin SOT23W surface mount
3-pin SIP through hole
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
3-pin SOT23W surface mount
3-pin SIP through hole
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
3-pin SOT23W surface mount
3-pin SIP through hole
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
3-pin SOT23W surface mount
3-pin SIP through hole
160
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
3-pin SOT23W surface mount
3-pin SIP through hole
*Contact Allegro for additional packing options.
Absolute Maximum Ratings
Characteristic
Symbol
Notes
Rating
Units
V
Supply Voltage
VCC
VRCC
VOUT
VROUT
IOUTSINK
B
30
–30
Reverse Supply Voltage
Output Off Voltage
V
30
V
Reverse Output Voltage
Output Current
–0.5
V
25
mA
G
Magnetic Flux Density
Unlimited
–40 to 85
–40 to 150
165
Range E
Range L
ºC
ºC
ºC
ºC
Operating Ambient Temperature
TA
Maximum Junction Temperature
Storage Temperature
TJ(max)
Tstg
–65 to 170
Allegro MicroSystems, Inc.
115 Northeast Cutoff
2
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A1101, A1102, A1103,
A1104, and A1106
Continuous-Time Switch Family
ELECTRICAL OPERATING CHARACTERISTICS over full operating voltage and ambient temperature ranges, unless otherwise noted
Characteristic
Supply Voltage1
Symbol
VCC
Test Conditions
Operating, TJ < 165°C
Min.
3.8
–
Typ.
–
Max. Units
24
10
V
Output Leakage Current
Output On Voltage
IOUTOFF
VOUT(SAT)
VOUT = 24 V, B < BRP
IOUT = 20 mA, B > BOP
–
μA
mV
–
215
400
Slew rate (dVCC/dt) < 2.5 V/ꢀs, B > BOP + 5 G or
B < BRP – 5 G
Power-On Time2
tPO
–
–
4
μs
Output Rise Time3
Output Fall Time3
tr
VCC = 12 V, RLOAD = 820 Ω, CS = 12 pF
–
–
–
–
–
–
–
400
400
7.5
ns
ns
tf
VCC = 12 V, RLOAD = 820 Ω, CS = 12 pF
ICCON
ICCOFF
IRCC
B > BOP
4.1
3.8
–
mA
mA
mA
Supply Current
B < BRP
7.5
Reverse Battery Current
Supply Zener Clamp Voltage
Supply Zener Current4
VRCC = –30 V
–10
VZ
ICC = 10.5 mA; TA = 25°C
32
–
–
–
–
V
IZ
VZ = 32 V; TA = 25°C
10.5
mA
1 Maximum voltage must be adjusted for power dissipation and junction temperature, see Power Derating section.
2 For VCC slew rates greater than 250 V/ꢀs, and TA = 150°C, the Power-On Time can reach its maximum value.
3 CS =oscilloscope probe capacitance.
4 Maximum current limit is equal to the maximum ICC(max) + 3 mA.
DEVICE QUALIFICATION PROGRAM
Contact Allegro for information.
EMC (Electromagnetic Compatibility) REQUIREMENTS
Contact Allegro for information.
Package LH
Package UA, 3-pin SIP
3
2
1
3
1
2
Terminal List
Number
Package LH Package UA
Name
Description
VCC
VOUT
GND
Connects power supply to chip
Output from circuit
Ground
1
2
3
1
3
2
Allegro MicroSystems, Inc.
115 Northeast Cutoff
3
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A1101, A1102, A1103,
A1104, and A1106
Continuous-Time Switch Family
MAGNETIC OPERATING CHARACTERISTICS1 over full operating voltage and ambient temperature ranges, unless otherwise noted
Characteristic
Symbol
Test Conditions
TA = 25°C
Min.
50
Typ.
100
100
180
180
280
280
–
Max. Units
160
175
230
245
340
355
350
450
400
430
130
145
175
190
285
300
330
430
300
330
80
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
A1101
A1102
A1103
A1104
A1106
A1101
A1102
A1103
A1104
A1106
A1101
A1102
A1103
A1104
A1106
Operating Temperature Range
TA = 25°C
30
130
115
220
205
70
Operating Temperature Range
TA = 25°C
Operate Point
BOP
Operating Temperature Range
TA = 25°C
Operating Temperature Range
TA = 25°C
35
–
280
260
10
340
340
45
Operating Temperature Range
TA = 25°C
Operating Temperature Range
TA = 25°C
10
45
75
125
125
225
225
–
Operating Temperature Range
TA = 25°C
60
165
150
50
Release Point
BRP
Operating Temperature Range
TA = 25°C
Operating Temperature Range
TA = 25°C
25
–
180
160
20
240
240
55
Operating Temperature Range
TA = 25°C
Operating Temperature Range
TA = 25°C
20
55
80
30
55
80
Operating Temperature Range
TA = 25°C
30
55
80
30
55
80
Hysteresis
BHYS
Operating Temperature Range
TA = 25°C
30
55
80
20
55
–
Operating Temperature Range
TA = 25°C
20
55
–
70
105
105
140
140
Operating Temperature Range
70
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 algebraic 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, Inc.
115 Northeast Cutoff
4
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A1101, A1102, A1103,
A1104, and A1106
Continuous-Time Switch Family
Characteristic
Symbol
Test Conditions
Value Units
Package LH, 1-layer PCB with copper limited to solder pads
228 ºC/W
2
Package LH, 2-layer PCB with 0.463 in. of copper area each
side connected by thermal vias
RθJA
Package Thermal Resistance
110
ºC/W
Package UA, 1-layer PCB with copper limited to solder pads
165 ºC/W
Power Derating Curve
TJ(max) = 165ºC; ICC = ICC(max)
25
24
23
V
CC(max)
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
Package LH, 2-layer PCB
(RQJA = 110 ºC/W)
Package UA, 1-layer PCB
(RQJA = 165 ºC/W)
Package LH, 1-layer PCB
(RQJA = 228 ºC/W)
4
V
CC(min)
3
2
20
40
60
80
100
120
140
160
180
Power Dissipation versus Ambient Temperature
1900
1800
1700
1600
1500
1400
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
20
40
60
80
100
120
140
160
180
Temperature (°C)
Allegro MicroSystems, Inc.
115 Northeast Cutoff
5
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A1101, A1102, A1103,
A1104, and A1106
Continuous-Time Switch Family
Characteristic Data
Supply Current (On) versus Ambient Temperature
(A1101/02/03/04/06)
Supply Current (On) versus Supply Voltage
(A1101/02/03/04/06)
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0
8.0
7.0
6.0
T
(°C)
A
V
(V)
CC
5.0
4.0
3.0
2.0
1.0
0
–40
25
24
3.8
150
–50
0
50
100
150
0
5
10
15
20
25
TA (°C)
VCC (V)
Supply Current (Off) versus Ambient Temperature
(A1101/02/03/04/06)
Supply Current (Off) versus Supply Voltage
(A1101/02/03/04/06)
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0
T
A
(°C)
V
(V)
CC
–40
25
24
3.8
150
0
5
10
15
20
25
–50
0
50
100
150
TA (°C)
VCC (V)
Output Voltage (On) versus Ambient Temperature
(A1101/02/03/04/06)
Output Voltage (On) versus Supply Voltage
(A1101/02/03/04/06)
400
400
350
300
250
200
150
100
50
350
300
250
200
150
100
50
T
A
(°C)
V
(V)
CC
–40
25
24
3.8
150
0
0
–50
0
50
100
150
0
5
10
15
20
25
TA (°C)
VCC (V)
Allegro MicroSystems, Inc.
115 Northeast Cutoff
6
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A1101, A1102, A1103,
A1104, and A1106
Continuous-Time Switch Family
Functional Description
OPERATION
packaging to tighten magnetic parameter distributions. In con-
trast, 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-stabilization offset cancellation algorithm.
The output of these devices switches low (turns on) when a
magnetic field (south polarity) perpendicular to the Hall sen-
sor 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 differ-
ence in the magnetic operate and release points is the hysteresis,
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.
Bhys, of the device. This built-in hysteresis allows clean switch-
ing 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
For more information on the chopper stabilization technique,
refer to Technical Paper STP 97-10, Monolithic Magnetic Hall
Sensor Using Dynamic Quadrature Offset Cancellation and
Technical Paper STP 99-1, Chopper-Stabilized Amplifiers with a
Track-and-Hold Signal Demodulator.
Continuous-time devices, such as the A110x family, offer the
fastest available power-on settling time and frequency response.
Due to offsets generated during the IC packaging process,
continuous-time devices typically require programming after
(A)
(B)
VS
V+
VCC
VCC
RL
Sensor Output
A110x
VOUT
GND
VOUT(SAT)
B+
0
B–
0
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, Inc.
115 Northeast Cutoff
7
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A1101, A1102, A1103,
A1104, and A1106
Continuous-Time Switch Family
ADDITIONAL APPLICATIONS INFORMATION
Extensive applications information for Hall-effect sensors is
available in:
• Hall-Effect IC Applications Guide, Application Note 27701
• Hall-Effect Devices: Gluing, Potting, Encapsulating, Lead
Welding and Lead Forming, Application Note 27703.1
• Soldering Methods for Allegro’s Products – SMT and Through-
Hole, Application Note 26009
All are provided in Allegro Electronic Data Book, AMS-702,
and the Allegro Web site, www.allegromicro.com.
1
2
3
4
5
VCC
t
t
VOUT
Output Sampled
t
PO(max)
Figure 2. Continuous-Time Application, B < BRP.. This figure illustrates the use of a quick cycle for chopping VCC in order to conserve battery power.
Position 1, power is applied to the device. Position 2, the output assumes the correct state at a time prior to the maximum Power-On Time, tPO(max)
.
The case shown is where the correct output state is HIGH. Position 3, tPO(max) has elapsed. The device output is valid. Position 4, after the output is
valid, a control unit reads the output. Position 5, power is removed from the device.
Allegro MicroSystems, Inc.
115 Northeast Cutoff
8
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A1101, A1102, A1103,
A1104, and A1106
Continuous-Time Switch Family
Power Derating
Power Derating
Example: Reliability for VCC at TA=150°C, package UA, using
minimum-K PCB.
The device must be operated below the maximum junction
temperature of the device, TJ(max). Under certain combinations of
peak conditions, reliable operation may require derating sup-
plied power or improving the heat dissipation properties of the
application. This section presents a procedure for correlating
factors affecting operating TJ. (Thermal data is also available on
the Allegro MicroSystems Web site.)
Observe the worst-case ratings for the device, specifically:
RθJA=165°C/W, TJ(max) =165°C, VCC(max)= 24 V, and
ICC(max) = 7.5 mA.
Calculate the maximum allowable power level, PD(max). First,
invert equation 3:
The Package Thermal Resistance, RθJA, is a figure of merit sum-
marizing the ability of the application and the device to dissipate
heat from the junction (die), through all paths to the ambient air.
Its primary component is the Effective Thermal Conductivity,
K, of the printed circuit board, including adjacent devices and
traces. Radiation from the die through the device case, RθJC, is
relatively small component of RθJA. Ambient air temperature,
TA, and air motion are significant external factors, damped by
overmolding.
ΔTmax = TJ(max) – TA = 165°C–150°C = 15°C
This provides the allowable increase to TJ resulting from internal
power dissipation. Then, invert equation 2:
PD(max) = ΔTmax ÷RθJA =15°C÷165 °C/W=91mW
Finally, invert equation 1 with respect to voltage:
VCC(est) = PD(max) ÷ ICC(max) = 91mW÷7.5mA=12.1 V
The effect of varying power levels (Power Dissipation, PD), can
be estimated. The following formulas represent the fundamental
relationships used to estimate TJ, at PD.
The result indicates that, at TA, the application and device can
dissipate adequate amounts of heat at voltages ≤VCC(est)
.
Compare VCC(est) to VCC(max). If VCC(est) ≤ VCC(max), then reli-
able operation between VCC(est) and VCC(max) requires enhanced
RθJA. If VCC(est) ≥ VCC(max), then operation between VCC(est) and
VCC(max) is reliable under these conditions.
PD = VIN
I
(1)
×
IN
ΔT = PD
R
(2)
θJA
×
TJ = TA + ΔT
(3)
For example, given common conditions such as: TA= 25°C,
VCC = 12 V, ICC = 4 mA, and RθJA = 140 °C/W, then:
PD = VCC
I
= 12 V 4 mA = 48 mW
×
×
CC
ΔT = PD
R
= 48 mW 140 °C/W = 7°C
×
×
θJA
TJ = TA + ΔT = 25°C + 7°C = 32°C
A worst-case estimate, PD(max), represents the maximum allow-
able power level (VCC(max), ICC(max)), without exceeding TJ(max)
at a selected RθJA and TA.
,
Allegro MicroSystems, Inc.
115 Northeast Cutoff
9
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A1101, A1102, A1103,
A1104, and A1106
Continuous-Time Switch Family
Package LH, 3-Pin (SOT-23W)
2.975
B
1.49
4º
A
3
0.180
B
0.96
B
2.90
1.91
0.38
2
1
0.25
Seating Plane
Gauge Plane
10º
1.00
All dimensions nominal, not for tooling use
Dimensions in millimeters
10º
0.95
0.40
A
B
0.05
Active Area Depth 0.28
Hall element (not to scale)
Allegro MicroSystems, Inc.
115 Northeast Cutoff
10
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A1101, A1102, A1103,
A1104, and A1106
Continuous-Time Switch Family
Package UA, 3-Pin SIP
4.09
4.09
45°
45°
A
A
B
B
C
C
2.01
2.01
3X10°
1.52
1.52
3.02
3.02
1.44
1.44
C
C
45°
45°
C
C
0.79
0.79
1.02
MAX
2.16
MAX
14.99
0.41
15.75
0.41
1
2
3
1
2
3
0.43
1.27
0.43
1.27
Package UA, Conventional Leadframe
Package UA, Matrix Leadframe
All dimensions nominal, not for tooling use
Dimensions in millimeters
Exact case and lead configuration at supplier
discretion within limits shown
Active Area Depth, 0.50 mm
A
B
C
Gate and tie bar burr area (for conventional leadframe, gate burr only)
Hall element, not to scale
Note: Matrix configuration not available for A1106 variants.
Allegro MicroSystems, Inc.
115 Northeast Cutoff
11
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A1101, A1102, A1103,
A1104, and A1106
Continuous-Time Switch Family
Copyright ©2006-2008, Allegro MicroSystems, Inc.
The products described herein are manufactured under one or more of the following U.S. patents: 5,045,920; 5,264,783; 5,442,283; 5,389,889;
5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719; 5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents pending.
Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to per-
mit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the
information being relied upon is current.
Allegro’s products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the
failure of that life support device or system, or to affect the safety or effectiveness of that device or system.
The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use;
nor for any infringement of patents or other rights of third parties which may result from its use.
For the latest version of this document, visit our website:
www.allegromicro.com
Allegro MicroSystems, Inc.
115 Northeast Cutoff
12
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
相关型号：
A1101_12
The Allegro A1101-A1104 and A1106 Hall-effect switches are next generation replacements for the popular Allegro 312x and 314x lines of unipolar switches.
ALLEGRO
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