UGQ5140

5140 ALLEGRO

Document overview

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Technical content

PROTECTED P OWER H ALL ® SENSOR: LAMP/SOLENOID DRIVER The UGQ5140K unipolar Hall effect switch is a monolithic integrated circuit designed for magnetic actuation of low-power incandescent lamps or inductive loads such as relays or solenoids. Included on chip is a Darlington power output that is capable of con- tinuously sinking in excess of 300 mA. Internal protection circuitry limits surge (lamp turn-ON) or fault currents to approximately 900 mA. A sensitive magnetic threshold allows the device to be used in con- junction with inexpensive magnets or in applications that require relatively large operating distances. Each sensor/driver includes a magnetic sensing Hall voltage generator, operational amplifier, Schmitt trigger, voltage regulator, and an open-collector, high-gain Darlington power output stage. The regulator allows use of the device with supply voltages of 4.5 V to 28 V. On-chip compensation circuitry stabilizes switch-point perfor- mance over temperature. The magnetic operation of this device is similar to that of the A3141E— Hall-effect switch. The sensitive magnetic switch point coupled with the power output, current limiting, and thermal limiting circuitry allow the UGQ5140K to magnetically actuate various loads without requiring any external components. The UGQ5140K is rated for operation over an extended tempera- ture range of -40°C to +85°C. It is supplied in a four-pin mini-SIP plastic package, 0.200" (5.08 mm) wide, 0.130" (3.30 mm) high, and 0.060" (1.54 mm) thick.

FEATURES

n Magnetically Actuated Power Switch n Temperature-Compensated Switch Points n High Current-Sink Capability 300 mA Continuous 900 mA Peak Current Limit n Output Short-Circuit Protection n Low Quiescent Standby Current n Linear Thermal Limiting n Automotive Temperature Range -40°C to +85°C, Operating n Internal Inductive Flyback/Clamp Diode Protection n Reverse Battery Protection n Low-Profile 4-Pin Mini-SIP 5140 PROTECTED P OWER H ALL ® SENSOR — LAMP/SOLENOID DRIVER Always order by complete part number: UGQ5140K . Pinning is shown viewed from branded side. Dwg. PH-001 X 1SUPPLY V CC GROUND DIODE OUTPUT 234 Data Sheet 27695* ABSOLUTE MAXIMUM RATINGS at TA = +25°C Over-Current Protected Output Voltage, Package Power Dissipation, Operating Temperature Range, Storage Temperature Range, * Output is current limited at approximately 900 mA and junction temperature limited if current in excess of 900 mA is attempted. See Circuit Description and Applications for further information.

PROTECTED P OWER H ALL ® SENSOR: LAMP/SOLENOID DRIVER

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000 Limits Characteristic Symbol Test Conditions Min. Typ. Max. Units Supply Voltage Range V CC Operating 4.5 12 24 V Output Leakage Current I OUT VOUT = 24 V — <1.0 10 µA Output Sustaining Voltage V OUT(SUS) IOUT = 100 mA 35 — — V Output Saturation Voltage V OUT(SAT) IOUT = 300 mA, VCC = 24 V — 0.84 1.2 V Over-Current Limit I LIMIT VCC = VOUT = 12 V, B ≥ 500 G — 900 — mA Output Rise Time t r VCC = 12 V, VBB = 18 V, — 0.04 2.0 µs Output Fall Time t f R L = 1.1 kΩ , CL = 20 pF — 0.04 2.0 µs Supply Current I CC Output OFF — 5.5 10 mA Diode Forward Voltage V F IF = 300 mA — 1.1 1.5 V Diode Leakage Current I R VR = 35 V — <1.0 50 µA Thermal Limit T LIMIT VCC = VOUT = 12 V, B ≥ 500 G, IOUT = 10 mA — 165 — °C TA = +25°CT A = -40°C to +85°C Magnetic Operate Point B OP 70 155 200 45 — 240 G Magnetic Release point B RP 50 100 180 25 — 220 G Hysteresis B hys 20 55 — 20 — — G Typical Data is at TA = +25°C and is for design information only. 50 75 100 125 150 1.0 0.2 ALLOWABLE PACKAGE POWER DISSIPATION IN WATTSAMBIENT TEMPERATURE IN °C 0.8 0.6 0.4 Dwg. GH-001 0-25 FREE AIR, R = 177°C/WqJA -50 REG.

1 VCC

REV. BATTERY PROTECTION Dwg. FH-001 DIODE OUTPUT GROUND <<1W THERMAL LIMIT CURRENT LIMIT X W Copyright © 1991, 1995 Allegro MicroSystems, Inc. FUNCTIONAL BLOCK DIAGRAM ELECTRICAL CHARACTERISTICS at TA = -40°C to +85°C, VCC = 4.5 V to 24 V (unless otherwise noted). MAGNETIC CHARACTERISTICS at VCC = 4.5 V to 24 V.

PROTECTED P OWER H ALL ® SENSOR: LAMP/SOLENOID DRIVER TYPICAL OPERATING CHARACTERISTICS -20 0 25 55 85 180 100 AMBIENT TEMPERATURE IN °C 160 140 120 -40 Dwg. GH-006A I = 10 mA OUT SWITCH POINT IN GAUSS OPERATE POINT RELEASE POINT -20 0 25 55 85 1.0 0.6 AMBIENT TEMPERATURE IN °C 0.9 0.8 0.7 -40 Dwg. GH-002A SATURATION VOLTAGE IN VOLTS I = 300 mA OUT -20 0 25 55 85 9.0 5.0 AMBIENT TEMPERATURE IN °C 8.0 7.0 6.0 -40 Dwg. GH-003A SUPPLY CURRENT IN mA OUTPUT ON I = 10 mA OUT OUTPUT OFF V = 12 V CC 25 85 105 125 1000 800 AMBIENT TEMPERATURE IN °C 950 900 Dwg. GH-004 -20-40 850 750 PEAK CURRENT LIMIT IN mA

PROTECTED P OWER H ALL ® SENSOR: LAMP/SOLENOID DRIVER Worcester, Massachusetts 01615-0036 (508) 853-5000 TYPICAL TRANSFER CHARACTERISTICS at TA = +25°C 100 125 150 175 200 3.0 OUTPUT VOLTAGE IN VOLTS MAGNETIC FLUX DENSITY IN GAUSS 9.0 6.0 Dwg. GH-007 50250 I = 300 mA OUT B OP B RP V OUT(SAT) V B B CIRCUIT DESCRIPTION AND OP- ERATION The UGQ5140K merges state-of-the-art Hall effect sensing and power driving tech- nologies to allow precision non-contact actuation of incandescent lamps or inductive loads. It is rated for operation over an extended temperature range as typically required in automotive applications. MAGNETIC OPERATION As shown in the Transfer Characteristics graph, the output of the device (pin 2) switches low when the magnetic field at the Hall sensor exceeds the operate point threshold (B OP ). At this point, the output voltage is VOUT(SAT) . When the magnetic field is reduced to below the release point thresh- old (B RP ), the device output goes high. The difference in the magnetic operate and release points is called the hysteresis (B H ) of the part. This built-in hysteresis allows clean switching of the output even in the presence of external mechanical vibration and electri- cal noise. CURRENT AND THERMAL LIMITING Output short circuits may be caused by faulty connectors, crimped wiring harnesses, or blown loads. In such cases, current and thermal limit circuitry will protect the output transistor against destruction. Current through the output transistor is sensed with a low-value on-chip aluminum resistor. The voltage drop across this resistor is fed back to control the base drive of the output stage. This feedback prevents the output transistor from exceeding its maximum current density rating by limiting the output current to approximately 900 mA. It may also cause the output voltage to increase (V OUT = VBB - [ILIMIT x RL]). In this mode, the device will dissipate an increased amount of power (P D = VOUT x ILIMIT) and the output transistor will be thermally stressed.

PROTECTED P OWER H ALL ® SENSOR: LAMP/SOLENOID DRIVER Worcester, Massachusetts 01615-0036 (508) 853-5000 FIGURE 3 TYPICAL LAMP DRIVER APPLICATION TYPICAL APPLICATIONS INCANDESCENT LAMP DRIVER High incandescent lamp turn-ON currents (com- monly called in-rush currents) can contribute to poor lamp reliability and destroy semiconductor lamp drivers. Warm- ing resistors protect both driver and lamp but use signifi- cant power when the lamp is OFF while current-limiting resistors waste power when the lamp is ON. Lamps with steady-state current ratings to 300 mA can be driven by the UGQ5140K (Figure 3) without the need for warming or current limiting resistors. In applications using several sensor/drivers to control multiple lamps, the internal clamp diodes may be connected together to an appropriate current-limiting resistor and simple “lamp test” switch. As shown in Figure 4, when an incandescent lamp is initially turned ON, the cold filament is at minimum resis- tance and will normally allow a 10x to12x peak in-rush current. As the lamp warms up, the filament resistance increases to its rated value and the lamp current is reduced to its steady-state rating. When switching a lamp with the UGQ5140K, the internal current-limiting circuitry limits the peak current to approximately 900 mA. The device will stay in the current limit and delta temperature limit modes until the lamp resistance increases to its rated steady-state value (Figure 4). A side-effect of this current- limiting feature is that lamp turn-on times will increase. Typical lamp turn-on times are shown in Figure 5. INDUCTIVE LOAD DRIVER Connecting the internal clamp diode (pin 3) to the positive supply allows relays or other inductive loads to be driven directly, as shown in Figure 6. The internal diode prevents damage to the output transistor by clamping the high-voltage spikes which occur when turning OFF an inductive load. An optional external Zener diode can be used to increase the flyback voltage, providing a much faster inductive load turn-OFF current decay, resulting in faster dropout (reduced relay contact arcing), and im- proved performance. The maximum Zener voltage, plus the load supply voltage, plus the clamp diode forward voltage should not exceed 35 volts. FIGURE 4 LAMP CURRENT vs TIME Dwg. EH-001 X V CC 432 OPTIONAL LAMP TEST (SEE TEXT) +12 V NORMAL LAMP IN-RUSH CURRENT TIME CURRENT LIMIT Dwg WH -001 NOT TO SCALE DELTA TEMP. LIMIT

PROTECTED P OWER H ALL ® SENSOR: LAMP/SOLENOID DRIVER SENSOR LOCATIONFIGURE 5 OUTPUT VOLTAGE OUTPUT CURRENT ZENER CLAMP DIODE CLAMP V BB VOUT(SAT) V + VBB F V + V + VBB Z F FIGURE 6 Dwg. EH-002 X V CC 432 +12 V OPTIONAL ZENER Dwg. WP-001-1 LAMP TURN-ON TIME A 1 432 Dwg. MH-001B 0.015" 0.38 mm NOM 0.121" 3.07 mm 0.053" 1.34 mm BRANDED SURFACE ACTIVE AREA DEPTH -20 0 25 55 85 150 AMBIENT TEMPERATURE IN °C 125 100 -40 Dwg. GH-005A V = 14 V BB APPROXIMATE LAMP TURN-ON TIME IN ms #168 BULB

14 V, 350 mA

#194 BULB

14 V, 270 mA

TYPICAL RELAY/SOLENOID DRIVER APPLICATION

PROTECTED P OWER H ALL ® SENSOR: LAMP/SOLENOID DRIVER Worcester, Massachusetts 01615-0036 (508) 853-5000 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 design of its products. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use. Dimensions in Inches (controlling dimensions) Dimensions in Millimeters (for reference only 45° Dwg. MH-009C in 0.063 0.059 0.033 0.015 0.016 0.050 BSC 1234 45° SEE NOTE 0.208 0.203 0.138 0.133 0.600 0.560 0.085 MAX 45° Dwg. MH-009C mm 1.60 1.50 0.84 0.38 0.41 1.27 BSC 1234 45° SEE NOTE 5.28 5.16 3.51 3.38 15.24 14.23 2.16 MAX NOTES: 1. Tolerances on package height and width represent allowable mold offsets. Dimensions given are measured at the widest point (parting line). 2. Exact body and lead configuration at vendor’s option within limits shown. 3. Height does not include mold gate flash. 4. Recommended minimum PWB hole diameter to clear transition area is 0.035” (0.89 mm). 5. Where no tolerance is specified, dimension is nominal.