MELEXIS US3881L, US3881E Datasheet

US3881

CMOS Low Voltage Hall Effect Latch

US3881 CMOS Low Voltage Hall Effect Latch 3901003881 Rev 4.2 7/23/01 Page 1

Features and Benefits

• Chopper stabilized amplifier stage

• Optimized for BDC motor applications

• New miniature package / thin, high reliability package

• Operation down to 2.2V

• CMOS for optimum stability, quality, and cost

Applications

• Solid state switch

• Brushless DC motor commutation

• Speed sensing

• Linear position sensing

• Angular position sensing

• Current sensing

Ordering Information

Part No. Temperature Suffix Package Temperature Range

US3881 E SO or UA -40oC to 85oC Commercial
US3881 L SO or UA -40oC to 150oC Automotive

* Contact factory or Sale Representative for legacy temperature options

Description

The US3881 is a bipolar Hall effect sensor IC fabri­cated from mixed signal CMOS technology. It in­corporates advanced chopper stabilization tech­niques to provide accurate and stable magnetic
switch points. There are many applications for this
sensor in addition to those listed above. The de­sign, specifications, and performance have been
optimized for commutation applications in 5V and
12V brushless DC motors.

The output transistor will be latched on (BOP) in the
presence of a sufficiently strong South pole mag­netic field facing the marked side of the package.
Similarly, the output will be latched off (BRP) in the
presence of a North field.

The SOT-23 device is reversed from the UA pack­age. The SOT-23 output transistor will be latched
on in the presence of a sufficiently strong North
pole magnetic field subjected to the marked face.

Functional Diagram

Note: Static sensitive device; please observe ESD precautions. Re­verse VDD protection is not included. For reverse voltage protec­tion, a 100Ω resistor in series with V

DD

is recommended.

Output

GND

V

DD

Voltage

Regulator

Chopper

SO Package
Pin 1 - V

DD

Pin 2 - Output
Pin 3 - GND

UA Package

Pin 1 - V

DD

Pin 2 - GND

Pin 3 - Output

US3881 CMOS Low Voltage Hall Effect Latch 3901003881 Rev 4.2 7/23/01 Page 2

US3881

CMOS Low Voltage Hall Effect Latch

US3881 Electrical Specifications

DC Operating Parameters: TA = 25, VDD = 12VDC (unless otherwise specified).

Parameter Symbol Test Conditions Min Typ Max Units

Supply Voltage VDD Operating 2.2 18 V
Supply Current IDD B<BOP 1.5 2.5 4.0 mA
Saturation Voltage V

DS(on)

I

OUT

= 20 mA, B>BOP 0.4 0.5 V

Output Leakage I

OFF

B<BRP, V

OUT

= 18V 0.01 5.0 ì A
Output Rise Time tr VDD = 12V, RL = 1.1KÙ, CL = 20pf 0.04 ì s
Output Fall Time tf VDD = 12V, RL = 1.1KÙ, CL = 20pf 0.18 ì s

US3881 Magnetic Specifications

DC Operating Parameters: TA = -40 to 150oC, VDD =12 VDC (unless otherwise specified). 1mT=10 Gauss.
Parameter Symbol Test Conditions Min Typ Max Units

Operating Point BOP 1.0 5.0 9.0 mT
Release Point BRP -9.0 -5.0 -1.0 mT
Hysteresis B

hys

5.5 10.0 12.0 mT

Melexis Inc. reserves the right to make changes without further notice to any products herein to improve reliability, function or design. Melexis
does not assume any liability arising from the use of any product or application of any product or circuit described herein.

Supply Voltage (Operating), VDD 18V
Supply Current (Fault), IDD 50mA
Output Voltage, V

OUT

18V

Output Current (Fault), I

OUT

50mA
Power Dissipation, PD 100mW
Operating Temperature Range, TA -40 to 150°C
Storage Temperature Range, TS -65 to 150°C
Maximum Junction Temp, TJ 175°C
ESD Sensitivity (All Pins) +/- 4KV

Absolute Maximum Ratings