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A1101, A1102, A1103, A1104, and A1106
Continuous-Time Switch Family
The Allegro(R) A1101-A1104 and A1106 Hall-effect switches are next generation replacements for the popular Allegro 312x and 314x lines of bipolar 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 UA is a three-lead ultramini SIP for through-hole mounting. Each package is lead (Pb) free, with 100% matte tin plated leadframes.
Package LH, 3-pin Surface Mount
GND 3
1 2
3
1 VCC
2 VOUT
Package UA, 3-pin SIP
Features and Benefits
1 VCC 2 GND 3 VOUT
Continuous-time operation - Fast power-on time
12 3
- Low noise Stable operation over full operating temperature range Reverse battery protection
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC .......................................... 30 V Reverse-Supply Voltage, VRCC ........................ -30 V Output Off Voltage, VOUT .................................. 30 V Reverse-Output Voltage, VROUT ..................... -0.5 V Output Current, IOUTSINK ............................... 25 mA Magnetic Flux Density, B .........................Unlimited Operating Temperature Ambient, TA, Range E.................. -40C to 85C Ambient, TA, Range L................ -40C to 150C Maximum Junction, TJ(max)........................165C Storage Temperature, TS .................. -65C to 170C
Solid-state reliability Factory-programmed at end-of-line for optimum performance Robust EMC performance High ESD rating Regulator stability without a bypass capacitor
A1101-DS
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
A1101, A1102, A1103, A1104, and A1106
Continuous-Time Switch Family Product 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* 7-in. reel, 3000 pieces/reel Bulk, 500 pieces/bag 7-in. reel, 3000 pieces/reel Bulk, 500 pieces/bag 7-in. reel, 3000 pieces/reel Bulk, 500 pieces/bag 7-in. reel, 3000 pieces/reel Bulk, 500 pieces/bag 7-in. reel, 3000 pieces/reel Bulk, 500 pieces/bag 7-in. reel, 3000 pieces/reel Bulk, 500 pieces/bag 7-in. reel, 3000 pieces/reel Bulk, 500 pieces/bag 7-in. reel, 3000 pieces/reel Bulk, 500 pieces/bag 7-in. reel, 3000 pieces/reel Bulk, 500 pieces/bag 7-in. reel, 3000 pieces/reel Bulk, 500 pieces/bag Mounting 3-pin SOT23W surface mount 3-pin SIP through hole 3-pin SOT23W surface mount 3-pin SIP through hole 3-pin SOT23W surface mount 3-pin SIP through hole 3-pin SOT23W surface mount 3-pin SIP through hole 3-pin SOT23W surface mount 3-pin SIP through hole 3-pin SOT23W surface mount 3-pin SIP through hole 3-pin SOT23W surface mount 3-pin SIP through hole 3-pin SOT23W surface mount 3-pin SIP through hole 3-pin SOT23W surface mount 3-pin SIP through hole 3-pin SOT23W surface mount 3-pin SIP through hole Ambient, TA -40C to 85C 10 -40C to 150C -40C to 85C 60 -40C to 150C -40C to 85C 150 -40C to 150C -40C to 85C 25 -40C to 150C -40C to 85C 160 -40C to 150C 430 450 355 245 175 BRP (Min) BOP (Max)
*Contact Allegro for additional packing options.
Functional Block Diagram
VCC
Regulator
To all subcircuits
VOUT Amp
Gain
Offset
Trim Control
GND
Terminal List Name VCC VOUT GND Description Connects power supply to chip Output from circuit Ground Number Package LH Package UA 1 1 2 3 3 2
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
2
A1101-DS
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 Output Leakage Current Output On Voltage Power-On Time2 Output Rise Time3 Output Fall Time3 Symbol VCC IOUTOFF VOUT(SAT) tPO tr tf ICCON ICCOFF IRCC VZ IZ Test Conditions Operating, TJ < 165C VOUT = 24 V, B < BRP IOUT = 20 mA, B > BOP Slew rate (dVCC/dt) < 2.5 V/s, B > BOP + 5 G or B < BRP - 5 G VCC = 12 V, RLOAD = 820 , CS = 12 pF VCC = 12 V, RLOAD = 820 , CS = 12 pF B > BOP B < BRP VRCC = -30 V ICC = 10.5 mA; TA = 25C VZ = 32 V; TA = 25C Min. 3.8 - - - - - - - - 32 - Typ. - - 215 - - - 4.1 3.8 - - - Max. 24 10 400 4 400 400 7.5 7.5 -10 - 10.5 Units V A mV s ns ns mA mA mA V mA
Supply Current Reverse Battery Current Supply Zener Clamp Voltage Supply Zener Current4
1
Maximum voltage must be adjusted for power dissipation and junction temperature, see Power Derating section. 2 For V CC slew rates greater than 250 V/s, and TA = 150C, the Power-On Time can reach its maximum value. 3 C =oscilloscope probe capacitance. S 4 Maximum current limit is equal to the maximum I CC(max) + 3 mA.
DEVICE QUALIFICATION PROGRAM Contact Allegro for information. EMC (Electromagnetic Compatibility) REQUIREMENTS Contact Allegro for information.
A1101-DS
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
3
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 Min. Typ. Max. Units
A1101 A1102 Operate Point BOP A1103 A1104 A1106 A1101 A1102 Release Point BRP A1103 A1104 A1106 A1101 A1102 Hysteresis BHYS A1103 A1104 A1106
1
TA = 25C Operating Temperature Range TA = 25C Operating Temperature Range TA = 25C Operating Temperature Range TA = 25C Operating Temperature Range TA = 25C Operating Temperature Range TA = 25C Operating Temperature Range TA = 25C Operating Temperature Range TA = 25C Operating Temperature Range TA = 25C Operating Temperature Range TA = 25C Operating Temperature Range TA = 25C Operating Temperature Range TA = 25C Operating Temperature Range TA = 25C Operating Temperature Range TA = 25C Operating Temperature Range TA = 25C Operating Temperature Range
50 30 130 115 220 205 70 35 280 260 10 10 75 60 165 150 50 25 180 160 20 20 30 30 30 30 20 20 70 70
100 100 180 180 280 280 - - 340 340 45 45 125 125 225 225 - - 240 240 55 55 55 55 55 55 55 55 105 105
160 175 230 245 340 355 350 450 400 430 130 145 175 190 285 300 330 430 300 330 80 80 80 80 80 80 - - 140 140
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
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).
A1101-DS
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
4
A1101, A1102, A1103, A1104, and A1106
Continuous-Time Switch Family
THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information
Characteristic Symbol Test Conditions Package LH, minimum-K PCB (single layer, single-sided with copper limited to solder pads) Package LH, low-K PCB (single layer, double-sided with 0.926 in2 copper area) Package UA, minimum-K PCB (single layer, single-sided with copper limited to solder pads) Value Units 110 228 165 C/W C/W C/W
Package Thermal Resistance
RJA
25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 20
Power Derating Curve TJ(max) = 165C; ICC = ICC(max)
VCC(max)
Maximum Allowable VCC (V)
Low-K PCB, Package LH (RJA = 110 C/W) Minimum-K PCB, Package UA (RJA = 165 C/W) Minimum-K PCB, Package LH (RJA = 228 C/W) VCC(min)
140 160 180
40
60
80
100
120
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
Power Dissipation, PD (m W)
Lo (R w-K PC J A= 11 B, P 0 ac Min C/ ka W ge (R imum ) LH -K JA = PC 165 B, P C/ ack W) age UA Min imu m-K (R P JA = 228 CB, Pa C/W ckag e LH )
40
60
80 100 120 Temperature (C)
140
160
180
A1101-DS
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
5
A1101, A1102, A1103, A1104, and A1106
Continuous-Time Switch Family Characteristic Data
Supply Current (On) versus Ambient Temperature
(A1101/02/03/04/06)
8.0 7.0 6.0 8.0 7.0
Supply Current (On) versus Supply Voltage
(A1101/02/03/04/06)
ICCON (mA)
5.0 4.0 3.0 2.0 1.0 0 -50 0 50 TA (C) 100 150
ICCON (mA)
VCC (V) 24 3.8
6.0 5.0 4.0 3.0 2.0 1.0 0 0 5 10 VCC (V) 15 20 25
TA (C) -40 25 150
Supply Current (Off) versus Ambient Temperature
(A1101/02/03/04/06)
8.0 7.0 6.0 8.0 7.0
Supply Current (Off) versus Supply Voltage
(A1101/02/03/04/06)
ICCOFF (mA)
ICCOFF (mA)
5.0 4.0 3.0 2.0 1.0 0 -50 0 50 TA (C) 100 150
VCC (V) 24 3.8
6.0 5.0 4.0 3.0 2.0 1.0 0 0 5 10 VCC (V) 15 20 25
TA (C) -40 25 150
Output Voltage (On) versus Ambient Temperature
400 350 300
Output Voltage (On) versus Supply Voltage
400 350 300 TA (C) -40 25 150
(A1101/02/03/04/06)
(A1101/02/03/04/06)
VOUT(SAT) (mV)
VOUT(SAT) (mV)
250 200 150 100 50 0 -50 0 50 TA (C) 100 150
VCC (V) 24 3.8
250 200 150 100 50 0 0 5 10 VCC (V) 15 20 25
A1101-DS
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
6
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 sensor 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 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 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-stabilization offset cancellation algorithm. The choice between continuous-time and chopper-stabilized designs is solely determined by the application. Battery management 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 Sensor Using Dynamic Quadrature Offset Cancellation and Technical Paper STP 99-1, Chopper-Stabilized Amplifiers with a Track-and-Hold Signal Demodulator.
(A)
VS
(B)
V+ VCC Switch to High
VCC
Switch to Low
RL Sensor Output
VOUT
A110x
VOUT
VOUT(SAT) 0 BRP B- 0 BOP BHYS B+
GND
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.
A1101-DS
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
7
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 ThroughHole, 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
VOUT
t
Output Sampled
tPO(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.
A1101-DS
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
8
A1101, A1102, A1103, A1104, and A1106
Continuous-Time Switch Family
Power Derating
Power Derating 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 supplied 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.) The Package Thermal Resistance, RJA, is a figure of merit summarizing 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, RJC, is relatively small component of RJA. Ambient air temperature, TA, and air motion are significant external factors, damped by overmolding. 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. PD = VIN x IIN T = PD x RJA TJ = TA + T (1) (2) (3) Example: Reliability for VCC at TA = 150C, package UA, using minimum-K PCB. Observe the worst-case ratings for the device, specifically: RJA = 165C/W, TJ(max) = 165C, VCC(max) = 24 V, and ICC(max) = 7.5 mA. Calculate the maximum allowable power level, PD(max). First, invert equation 3: Tmax = 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) = Tmax / RJA = 15C / 165 C/W = 91 mW Finally, invert equation 1 with respect to voltage: VCC(est) = PD(max) / ICC(max) = 91 mW / 7.5 mA = 12.1 V 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 reliable operation between VCC(est) and VCC(max) requires enhanced RJA. If VCC(est) VCC(max), then operation between VCC(est) and VCC(max) is reliable under these conditions.
For example, given common conditions such as: TA= 25C, VCC = 12 V, ICC = 4 mA, and RJA = 140 C/W, then: PD = VCC x ICC = 12 V x 4 mA = 48 mW T = PD x RJA = 48 mW x 140 C/W = 7C TJ = TA + T = 25C + 7C = 32C A worst-case estimate, PD(max), represents the maximum allowable power level (VCC(max), ICC(max)), without exceeding TJ(max), at a selected RJA and TA.
A1101-DS
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
9
A1101, A1102, A1103, A1104, and A1106
Continuous-Time Switch Family Package LH, 3-Pin (SOT-23W)
Package UA, 3-Pin
A1101-DS
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
10
A1101, A1102, A1103, A1104, and A1106
Continuous-Time Switch Family
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 permit 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 products are not authorized for use as critical components in life-support devices or systems without express written approval. 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. Copyright (c) 2005, Allegro MicroSystems, Inc.
A1101-DS
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
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