A1201 Allegro Micro Systems, Inc., A1201 Datasheet

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A1201

Manufacturer Part Number
A1201
Description
Continuous-Time Bipolar Switch Family
Manufacturer
Allegro Micro Systems, Inc.
Datasheet

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A1201-DS, Rev. 2
Supply Voltage, V
Reverse-Supply Voltage, V
Output Off Voltage, V
Reverse-Output Voltage, V
Output Current, I
Magnetic Flux Density, B .........................Unlimited
Operating Temperature
Storage Temperature, T
Ambient, T
Ambient, T
Maximum Junction, T
AB SO LUTE MAX I MUM RAT INGS
Package LH, 3-pin Surface Mount
1
1
Package UA, 3-pin SIP
2
3
A
A
, Range E.................. –40ºC to 85ºC
, Range L................ –40ºC to 150ºC
OUTSINK
CC
.......................................... 30 V
2
3
OUT
S
A1201, A1202, A1203, and A1204
.................. –65ºC to 170ºC
............................... 25 mA
J(max)
.................................. 30 V
ROUT
RCC
........................ –30 V
........................165ºC
..................... –0.5 V
1
2
1 2
3
3
Features and Benefits
The Allegro
next-generation replacements and extension of the popular Allegro A3134, A3133,
and A3132 bipolar switch product line. Overall, the A120x family, produced with
BiCMOS technology, consists of continuous-time devices that feature fast power-
on time and low-noise operation. Device programming is performed after packag-
ing, to ensure increased switchpoint accuracy by eliminating offsets that can be
induced by package stress. Unique Hall element geometries and low-offset ampli-
fiers help to minimize noise and to reduce the residual offset voltage normally
caused by device overmolding, temperature excursions, and thermal stress.
The A120x Hall-effect bipolar 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 auto-
motive and motor commutation applications, without adding external components.
All devices in the family are identical, except for magnetic switchpoints.
The small geometries of the BiCMOS process allow these devices to be pro-
vided in ultrasmall packages. The package styles available provide magnetically
optimized solutions for most applications. Package LH is a 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.
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
Continuous-Time Bipolar Switch Family
®
A1201, A1202, A1203 and A1204 Hall-effect bipolar switches are
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com

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A1201 Summary of contents

Page 1

... Continuous-Time Bipolar Switch Family ® The Allegro A1201, A1202, A1203 and A1204 Hall-effect bipolar switches are next-generation replacements and extension of the popular Allegro A3134, A3133, and A3132 bipolar switch product line. Overall, the A120x family, produced with BiCMOS technology, consists of continuous-time devices that feature fast power- on time and low-noise operation ...

Page 2

... A1201, A1202, A1203, and A1204 Part Number Packing* A1201ELHLT-T 7-in. reel, 3000 pieces/reel A1201EUA-T Bulk, 500 pieces/bag A1201LLHLT-T 7-in. reel, 3000 pieces/reel A1201LUA-T Bulk, 500 pieces/bag A1202ELHLT-T 7-in. reel, 3000 pieces/reel A1202EUA-T Bulk, 500 pieces/bag A1202LLHLT-T 7-in. reel, 3000 pieces/reel A1202LUA-T Bulk, 500 pieces/bag A1203ELHLT-T 7-in ...

Page 3

... A1201, A1202, A1203, and A1204 Continuous-Time Bipolar Switch Family OPERATING CHARACTERISTICS over full operating voltage and ambient temperature ranges, unless otherwise noted Characteristic Symbol Electrical Characteristics 1 Supply Voltage Output Leakage Current I OUTOFF Output On Voltage V OUT(SAT) Power-On Time 2 Output Rise Time 3 Output Fall Time ...

Page 4

... A1201, A1202, A1203, and A1204 Continuous-Time Bipolar Switch Family THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information Characteristic Package Thermal Resistance A1201-DS, Rev. 2 Symbol 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 R θ ...

Page 5

... A1201, A1202, A1203, and A1204 Continuous-Time Bipolar Switch Family Supply Current (On) versus Ambient Temperature (A1201/02/03/04) 8.0 7.0 6.0 5.0 4.0 3.0 2.0 1.0 0 – (°C) A Supply Current (Off) versus Ambient Temperature (A1201/02/03/04) 8.0 7.0 6.0 5.0 4.0 3.0 2.0 1.0 0 – (°C) A Output Voltage (On) versus Ambient Temperature (A1201/02/03/04) 400 350 300 250 200 150 100 ...

Page 6

... A1201, A1202, A1203, and A1204 Continuous-Time Bipolar Switch Family Operate Point versus Ambient Temperature (A1201 -10 -20 -30 -40 - (°C) A Release Point versus Ambient Temperature (A1201 -10 -20 -30 -40 -50 - (°C) A Hysteresis versus Ambient Temperature ...

Page 7

... A1201, A1202, A1203, and A1204 Continuous-Time Bipolar Switch Family Operate Point versus Ambient Temperature (A1202, A1203 - (°C) A Release Point versus Ambient Temperature (A1202, A1203) -5 -15 -25 -35 -45 -55 -65 -75 - (°C) A Hysteresis versus Ambient Temperature ...

Page 8

... A1201, A1202, A1203, and A1204 Bipolar Device Switching The devices of the A120X family provide highly sensitive switching for applications using magnetic fields of alternating polarities, such as ring magnets. There are three switching modes for bipolar devices, referred to as latch, unipolar switch, and negative switch ...

Page 9

... A1201, A1202, A1203, and A1204 the field is reduced beyond the B level, the device switches OP back to the low state. The typical output behavior of the A120x devices is latching. That is, switching to the low state when the magnetic field at the Hall sensor exceeds the operate point threshold, B ...

Page 10

... A1201, A1202, A1203, and A1204 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 chopped with a very small duty cycle CC in order to conserve power (refer to figure 4). The duty cycle ...

Page 11

... A1201, A1202, A1203, and A1204 Power Derating The device must be operated below the maximum junction temperature of the device Under certain combinations of J(max) 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 T ...

Page 12

... A1201, A1202, A1203, and A1204 Continuous-Time Bipolar Switch Family A1201-DS, Rev. 2 Package LH, 3-Pin (SOT-23W) Package UA, 3-Pin 12 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com ...

Page 13

... A1201, A1202, A1203, and A1204 Continuous-Time Bipolar Switch Family A1201-DS, Rev. 2 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 ...

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