Document
A1201
Continuous-Time Bipolar Switch
FEATURES AND BENEFITS
▪ 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:
Not to scale
3-pin SOT23W (suffix LH)
NOT FOR NEW DESIGN
3-pin SIP, matrix HD style
(suffix UA)
3-pin SIP, chopper style
(suffix UA)
DESCRIPTION
The Allegro A1201 Hall-effect bipolar switch is a nextgeneration replacement and extension of the popular Allegro A3134 bipolar switch. Overall, the A1201, produced with BiCMOS technology, is a continuous-time device that features 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 lowoffset amplifiers help to minimize noise and to reduce the residual offset voltage normally caused by device overmolding, temperature excursions, and thermal stress.
TheA1201 Hall-effect bipolar switch includes 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 motor commutation applications, without adding external components. The device is a member of the A1201 product family which has identical electrical characteristics throughout, but provides a range of magnetic switchpoints.
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VCC
A1201-DS, Rev. 15
Functional Block Diagram
Regulator
To all subcircuits
Amp
Gain
Offset
Trim Control
VOUT
GND
November 4, 2016
A1201
Continuous-Time Bipolar Switch
DESCRIPTION (CONTINUED) 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 a SOT23W, a miniature low-profile surface-mount
package, while package UAis a three-lead ultramini SIPfor throughhole mounting. Each package is lead (Pb) free, with 100% matte tin plated leadframes.
SELECTION GUIDE
Part Number A1201ELHLT-T [2] A1201EUA-T [2][3] A1201LLHLT-T [2] A1201LUA-T [2][3]
Packing [1] 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
Ambient, TA (°C) BRP (Min) (G)
–40 to 85 –40 to 150
–50
1 Contact Allegro for additional packing options.
2 Variant is obsolete. 3 The chopper-style UA package is not for new design; the matrix HD style UA package is recommended for new designs.
BOP (Max) (G) 50
ABSOLUTE MAXIMUM RATINGS
Characteristic
Symbol
Supply Voltage Reverse Supply Voltage Output Off Voltage Reverse Output Voltage Output Current Sink Magnetic Flux Density
VCC VRCC VOUT VROUT IOUTSINK
B
Operating Ambient Temperature
Maximum Junction Temperature Storage Temperature
TA
TJ(max) Tstg
Range E Range L
Notes
Rating 30 –30 30 –0.5 25
Unlimited –40 to 85 –40 to 150
165 –65 to 170
Units V V V V mA G °C °C °C °C
Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com
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A1201
Continuous-Time Bipolar Switch
PINOUT DIAGRAMS AND TERMINAL LIST TABLE
GND
Package LH
3
Package UA
12
12
3
VCC GND VOUT
VCC VOUT
Terminal List
Name
Description
VCC VOUT GND
Connects power supply to chip Output from circuit Ground
Number Package LH Package UA
11 23 32
Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com
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A1201
Continuous-Time Bipolar Switch
OPERATING CHARACTERISTICS: Over full operating voltage and ambient temperature ranges, unless otherwise noted
Characteristic
Symbol
Test Conditions
Min. Typ. Max.
ELECTRICAL CHARACTERISTICS
Supply Voltage [1] Output Leakage Current Output On Voltage Power-On Time [2] Output Rise Time [3] Output Fall Time [3]
Supply Current
Reverse Battery Current
VCC IOUTOFF VOUT(SAT)
tPO
tr tf ICCON ICCOFF IRCC
Operating, TJ < 165°C VOUT = 24 V, B < BRP IOUT = 20 mA, B > BOP Slew rate (dVCC/dt) < 2.5 V/μs, B > BOP(max) + 5 G or B < BRP(min) – 5 G VCC = 12 V, RLOAD = 820 Ω, CS = 12 pF VCC = 12 V, RLOAD = 820 Ω, CS = 12 pF B > BOP B < BRP VRCC = –30 V
3.8 – 24 – – 10 – 215 400
––4
––2 ––2 – 3.8 7.5 – 3.5 7.5 – – –10
Supply Zener Clamp Voltage
VZ ICC = 30 mA; TA = 25°C
32 –
–
Supply Zener Current [4] MAGNETIC CHARACTERISTICS [5]
.