A3250LLT datasheet(4/16 Pages) ALLEGRO

4 / 16 page

Field-Programmable, Chopper-Stabilized,

Unipolar Hall-Effect Switches

A3250 and

A3251

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

OPERATING CHARACTERISTICS

valid over operating TA and VCC, unless otherwise specified

Characteristic

Symbol

Test Conditions

Min.

Typ.

Max.

Units

ELECTRICAL CHARACTERISTICS

Supply Voltage1

VCC

Running mode

4.2

–

Output Saturation Voltage

VOUT(sat)

IOUT = 20 mA; Switch state = ON

–

175

400

Output Leakage Current

IOFF

VOUT = 24 V; Switch state = OFF

–

μA

Supply Current

ICC(off)

A3250; B < BRP; VOUT = HIGH

–

4.0

7.0

A3251; B > BOP; VOUT = HIGH

–

4.0

7.0

ICC(on)

A3250; B > BOP; VOUT = LOW

–

6.0

10.0

A3251; B < BRP; VOUT = LOW

–

6.0

10.0

Output Rise Time

RLOAD = 820 Ω, CLOAD = 10 pF

–

5.0

μs

Output Fall Time

RLOAD = 820 Ω, CLOAD = 10 pF

–

5.0

μs

Chopping Frequency

–

340

–

kHz

Power-Up Time

ton

VOUT = HIGH

–

μs

Output Current Limit1,2

IOUT(lim)

Short-circuit protection

120

Power-On State

POS

A3250; B < BRP, t > ton

–

HIGH

–

A3251; B < BRP, t > ton

–

LOW

–

MAGNETIC CHARACTERISTICS

Initial Operate Point

BOP

–20

Temperature Drift of BOP

ΔBOP

BOP ≤ 500 gauss

–35

–

Hysteresis (BOP – BRP)Bhys

Package TA range = J

5.0

Package TA range = L

5.0

PROGRAMMING CHARACTERISTICS

Programmable BOP Values3

BOP(prog)

–

≥350

Number of Programming Bits

–

Switchpoint set

–

Bit

Programming lock

–

Bit

Resolution

BRES

–

7.0

–

TRANSIENT PROTECTION CHARACTERISTICS

Supply Zener Voltage

–

Supply Zener Current

VCC = 28 V

–

Reverse Battery Current

IRCC

VRCC = –18 V, TJ < TJ(max)

–

–5.0

1 Do not exceed TJ(max): Additional information on power derating is provided in the applications section.

2 Short-circuit protection is not intended for continuous operation; permanent damage may result.

3 Device can be used below 50 G but is not guaranteed to be a unipolar switch. It is the responsibility of the programmer to verify that the desired

switchpoint has been achieved.

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