UDN3625M

3625 ALLEGRO | Alldatasheet

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Requiring a minimum of external components, the UDN3625M and UDN3626M are monolithic ICs that provide single-chip control and direct drive solutions for many small, single-phase, unipolar brushless dc motor applications. Integrated into the ICs are a high- sensitivity Hall-effect sensor, control and commutating logic, a stable voltage regulator, extensive self and system protective functions, and two high-current saturated npn outputs. Both ICs include thermal shutdown, output over-current limiting, and output transient protection/ flyback diodes. The UDN3625M is nominally for 12 V motor applica- tions while the UDN3626M is better suited to 24 V motors. Output over-current limiting (relating to startup surge or a locked rotor condition) and short-circuit protection are provided by an internal current-sense resistor. The maximum (default) output load current is typically 1.3 A for the UDN3625M or 600 mA for the UDN3626M, but may be decreased by user selection of an external low-wattage resistor. A separate low-level output provides tachometer capability for motor speed control or sensing a locked rotor condition. With appro- priate external logic, pulse-width modulated (PWM) speed control can be accomplished at the output current adjust pin. These sensor/drivers are supplied in an 8-pin mini-DlP plastic package with a copper leadframe for increased package power handling capability. POWER H ALL ® SENSOR/DRIVERS FOR BRUSHLESS DC MOTORS Always order by complete part number, e.g., UDN3625M . See Maximum Ratings at left. PWM Current Control Voltage, Package Power Dissipation, Operating Temperature Range, Storage Temperature Range, Output current rating will be limited by ambient temperature, supply voltage, and duty cycle. Under any set of conditions, do not exceed a junction temperature of +150°C. UDN3625M UDN3626M V CC(MAX) 14 V 26 V IO(CONT) 1.0 A 0.45 A IO(PEAK) 1.6 A 0.75 A ABSOLUTE MAXIMUM RATINGS Data Sheet 27690A

FEATURES

I 900 mA/12 V or 400 mA /24 V Operation I Speed-Control (PWM) Capability I Locked-Rotor Indication I Minimum External Components I Over-Current Protected I Thermal Protection I Enhanced Reliability I Reduced Cost

3625 AND

3625 AND 3626

POWER H ALL ® SENSOR/DRIVERS FOR BRUSHLESS DC MOTORS

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000 TACH OUT SUPPLY OUT B Dwg. FP-005-1 REG. TSD GROUND X RADJ V S OUT A PWM/I ADJUST O FUNCTIONAL BLOCK DIAGRAM TRUTH TABLE Mag. FieldPWM/I OADJ OUT A OUTB > +BOP Open Low High > -BOP Open High Low Any <0.3 V High High 50 75 100 125 150 0.5 ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS TEMPERATURE IN °C 2.0 1.5 1.0 Dwg. GP-009-1B R = 55°C/WθJC FREE AIR, R = 80°C/WθJA Copyright © 1988, 1995, Allegro MicroSystems, Inc.

POWER H ALL ® SENSOR/DRIVERS FOR BRUSHLESS DC MOTORS ELECTRICAL CHARACTERISTICS at TA = +25°C, RADJ = ∞ , Over Operating Voltage Range (unless otherwise noted). Output Clamp Voltage (Test Fig. 1) Output Clamp Voltage Supply Current (Test Fig. 1) (Test Fig. 2) (Test Fig. 2) Limits Characteristic Symbol Test Conditions Min. Typ. Max. Units UDN3625M Operating Voltage Range V S 6.5 12 14 V Output Leakage Current I O VCC = VO = 24 V — — 100 µA Output Breakdown Voltage V (BR)CEX VCC = 24 V, lO = 10 mA* 34 — — V Output Saturation Voltage V O(SAT) IO = 450 mA, VS = 6.5 V — 0.25 0.4 V IO = 900 mA, VS = 12 V — 0.5 0.8 V Output Current Limit I O MAX R ADJ = ∞ , VO = 2 V 1.0 1.3 1.6 A VCL ICL = 10 mA, VCC = 0 11 12 13 V ICL = 450 mA=, VCC = 0 13 14 15 V Output Switching Time t PLH 50% V ADJ to VO = 3.0 V, lO = 450 mA — — 5.0 µs lCC R ADJ = ∞ , VS = 14 V, One Output ON — 30 38 mA R ADJ = 0 Ω , VS = 14 V, Outputs OFF — 8.0 10 mA UDN3626M Operating Voltage Range V S ‡2 4 2 6 V Output Leakage Current l O VCC = VO = 30 V — — 100 µA Output Breakdown Voltage V (BR)CEX VCC = 30 V, lO = 10 mA* 50 — — V Output Saturation Voltage V O(SAT) lO = 250 mA, VS = 6.5 V — 0.15 0.3 V lO = 400 mA, VS = 24 V — 0.3 0.5 V Output Current Limit l O MAX R ADJ = ∞ , VO = 2 V 450 600 750 mA VCL ICL = 10 mA, VCC = 0 17 18 20 V ICL = 250 mA, VCC = 0 19 20 22 V Output Switching Time t PLH 50% V ADJ to VO = 3.0 V, lO = 250 mA — — 5.0 µs Supply Current l CC R ADJ = ∞ , VS = 26 V, One Output ON — — 24 mA R ADJ = 0 Ω , VS = 26 V, Outputs OFF — 8.0 10 mA Continued next page...*l O is almost entirely Zener clamp current. † Pulse test. ‡ Dependent on value of external series Zener diode (see Applications), 6.5 V without a Zener diode.

POWER H ALL ® SENSOR/DRIVERS FOR BRUSHLESS DC MOTORS Worcester, Massachusetts 01615-0036 (508) 853-5000 ELECTRICAL CHARACTERISTICS continued Limits Characteristic Symbol Test Conditions Min. Typ. Max. Units Both Operate Point§ B OP — ±100 ±150 G Hysteresis B H — 200 — G Output Current Limit Ratio l O /lO MAX R ADJ = 39 kΩ — 0.75 — — R ADJ = 17 kΩ — 0.50 — — R ADJ = 10 kΩ — 0.25 — — PWM Control Current I ADJ VADJ = 0 — -350 -500 µA Tach Output Leak. Current I T VT = 14 V — — 10 µA Tach Output Sat. Voltage V T(SAT) IT = 750 µA — 0.2 0.4 V Thermal Shutdown T J –– 165 — °C Thermal Hysteresis ∆ TJ –– 10 — °C § Magnetic flux density is measured at most sensitive area of device, nominally located 0.055" (1.40 mm) below the top of the package. OUTPUT CLAMP VOLTAGE TEST (ONE OUTPUT TESTED AT A TIME) SUPPLY CURRENT TEST Dwg. No. EP-013 TEST FIG. 2 TEST FIG. 1

POWER H ALL ® SENSOR/DRIVERS FOR BRUSHLESS DC MOTORS SENSOR LOCATION APPLICATIONS INFORMATION Power Dissipation. Care should be taken in evaluating the package power dissipation of these devices. Total power dissipated by the device will consist of power due to the internal regulator, logic and drive circuitry (I CC x VCC ), power due to the output drivers (IO x VO(SAT) ), and power due to the clamp circuitry (ICL x VCL x duty cycle). For example: I CC x VCC = 38 mA (max) x 14 V = 532 mW (max) IO x VO(SAT) = 450 mA x 0.4 V (max) = 180 mW (max) ICL x VCL x duty cycle = 450 mA x 15 V (max) x 1% = 67.5 mW (max) Total package power dissipation = 779.5 mW (max) Some of the power dissipated by the device (ICC x VCC ) can be reduced by inserting a Zener diode in the supply line (ZA in the figure). Note that the voltage at the VCC pin under worst-case conditions must be greater than the minimum operating voltage (6.5 V). Transient Protection. A note of caution concerns negative (below ground) excursions of the outputs. In application, the coupling of the two motor windings can provide for just such a case. Reducing the coupling between windings will help, but ground clamp diodes or diodes in series with the motor windings might be required (D C or DS in the figure). Most small brushless motors will not require these diodes. System requirements usually utilize a diode type of reverse-polarity protection. If series diode protection is used with an inductive load (the usual fan application), a Zener clamp between V S and ground (ZB in the figure) is required. The Zener voltage must be greater than the supply voltage but less than the rated maximum allowable supply voltage. With diode reverse-polarity protection, a high-impedance supply, or a switched supply line, high-voltage spikes will be generated (especially with high-current or high-inductance loads) during normal operation, coasting, or immediately after turn-off. In these situations, a Zener clamp (Z B ) from VS to ground will be required. Over-Current Adjust Pin. The over-current limit may be reduced from the default value (IO MAX) by selection of an external resistor (RADJ ) at the PWM/I O ADJ pin.

POWER H ALL ® SENSOR/DRIVERS FOR BRUSHLESS DC MOTORS Worcester, Massachusetts 01615-0036 (508) 853-5000 S N Dw g. AP-001-1 By accepted magnetic convention, lines of flux emanate from the north pole of a magnet and enter the south pole. MAGNETIC FIELD DEFINITIONS +B-B B = 0 G Dwg. GP-008 OUT ON/LOWA OUT ON/LOWB +B O P -B O P The external overcurrent adjust and the thermal shutdown are commoned at the PWM/lO ADJ pin and tieing it to VCC will disable the thermal shut- down. PWM current/speed control can be performed at the PWM/lO ADJ pin from a standard totem-pole logic output with a series Schottky diode (1N5818,1N5819, or equivalent) or by pulling it low through an open- collector transistor (no pull-up resistor). PWM/l O ADJ input voltages greater than 0.3 V are not recommended and may create an unstable operating condition. TYPICAL FAN APPLICATION

POWER H ALL ® SENSOR/DRIVERS FOR BRUSHLESS DC MOTORS Dimensions in Inches (controlling dimensions) 0.014 0.008 0.300 BSC Dwg. MA-001-8A in 0.430 MAX 0.100 BSC 0.022 0.014 0.400 0.355 0.005 MIN 0.150 0.115 0.280 0.240 0.210 MAX 0.070 0.045 0.015 MIN NOTES: 1. Leads 1, 4, 5, and 8 may be half leads at vendor’s option. 2. Lead thickness is measured at seating plane or below. 3. Lead spacing tolerance is non-cumulative. 4. Exact body and lead configuration at vendor’s option within limits shown.

POWER H ALL ® SENSOR/DRIVERS FOR BRUSHLESS DC MOTORS Worcester, Massachusetts 01615-0036 (508) 853-5000 Dimensions in Millimeters (for reference only) 0.355 0.204 7.62 BSC Dwg. MA-001-8A mm 10.92 MAX 10.16 9.02 2.54 BSC 0.13 MIN 3.81 2.93 7.11 6.10 5.33 MAX 1.77 1.15 0.39 MIN 0.558 0.356 NOTES: 1. Leads 1, 4, 5, and 8 may be half leads at vendor’s option. 2. Lead thickness is measured at seating plane or below. 3. Lead spacing tolerance is non-cumulative. 4. Exact body and lead configuration at vendor’s option within limits shown. 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; 5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents pending. Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the information being relied upon is current. Allegro products are not authorized for use as critical components in life-support appliances, devices, or systems without express written approval. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsi- bility for its use; nor for any infringements of patents or other rights of third parties that may result from its use.