Data Sheet 27690B 3625 AND 3626 POWERHALL® SENSOR IC/DRIVERS FOR BRUSHLESS DC MOTORS 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 highsensitivity Hall-effect element, 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 applications while the UDN3626M is better suited to 24 V motors. T C U Y L D N O O R P E C D E N E U N ER I T F N E O R C S OR I D F — 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. ABSOLUTE MAXIMUM RATINGS Supply Voltage, VCC . . . . . . . . . . See Table Output Current, IO . . . . . . . . . . . . See Table PWM Current Control Voltage, VADJ . . . . . . . . . . . . . See Applications Magnetic Flux Density, B . . . . . . Unlimited Package Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . See Graph Operating Temperature Range, TA . . . . . . . . . . . . . . . . . -20°C to +85°C Storage Temperature Range, TS . . . . . . . . . . . . . . . . -65°C to +150°C VCC(MAX) IO(CONT) IO(PEAK) UDN3625M UDN3626M 14 V 1.0 A 1.6 A 26 V 0.45 A 0.75 A 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. A separate low-level output provides tachometer capability for motor speed control or sensing a locked rotor condition. With appropriate external logic, pulse-width modulated (PWM) speed control can be accomplished at the output current adjust pin. These sensor ICs/drivers are supplied in an 8-pin mini-DlP plastic package with a copper leadframe for increased package power handling capability. FEATURES ■ 900 mA /12 V or 400 mA /24 V Operation ■ Speed-Control (PWM) Capability ■ Locked-Rotor Indication ■ Minimum External Components ■ Over-Current Protected ■ Thermal Protection ■ Enhanced Reliability ■ Reduced Cost Always order by complete part number, e.g., UDN3625M . See Maximum Ratings at left. 3625 AND 3626 POWERHALL® SENSOR ICS/DRIVERS FOR BRUSHLESS DC MOTORS FUNCTIONAL BLOCK DIAGRAM VS SUPPLY 5 OUT B 4 TSD REG. 6 OUTA X +V 8 7 TACH OUT GROUND PWM/I O 1 ADJUST RADJ ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS Dwg. FP-005-1 2.0 TRUTH TABLE RθJC = 55°C/W Mag. Field 1.5 > +BOP > -BOP Any 1.0 0.5 0 25 PWM/IOADJ OUTA OUTB Open Open <0.3 V Low High High High Low High FREE AIR, RθJA = 80°C/W 50 75 100 TEMPERATURE IN °C 125 150 Dwg. GP-009-1B 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1988, 1995, Allegro MicroSystems, Inc. 3625 AND 3626 POWERHALL® SENSOR ICS/DRIVERS FOR BRUSHLESS DC MOTORS ELECTRICAL CHARACTERISTICS at TA = +25°C, RADJ = ∞, Over Operating Voltage Range (unless otherwise noted). Limits Characteristic Symbol Test Conditions Min. Typ. Max. Units 6.5 12 14 V VCC = VO = 24 V — — 100 µA UDN3625M Operating Voltage Range VS Output Leakage Current IO Output Breakdown Voltage V(BR)CEX VCC = 24 V, lO = 10 mA* 34 — — V Output Saturation Voltage VO(SAT) IO = 450 mA, VS = 6.5 V — 0.25 0.4 V IO = 900 mA, VS = 12 V — 0.5 0.8 V RADJ = ∞, VO = 2 V 1.0 1.3 1.6 A ICL = 10 mA, VCC = 0 11 12 13 V ICL = 450 mA=, VCC = 0 13 14 15 V Output Current Limit IO MAX Output Clamp Voltage (Test Fig. 1) VCL Output Switching Time tPLH 50% VADJ to VO = 3.0 V, lO = 450 mA — — 5.0 µs Supply Current (Test Fig. 2) lCC RADJ = ∞, VS = 14 V, One Output ON — 30 38 mA RADJ = 0 Ω, VS = 14 V, Outputs OFF — 8.0 10 mA ‡ 24 26 V VCC = VO = 30 V — — 100 µA UDN3626M Operating Voltage Range VS Output Leakage Current lO Output Breakdown Voltage V(BR)CEX VCC = 30 V, lO = 10 mA* 50 — — V Output Saturation Voltage VO(SAT) lO = 250 mA, VS = 6.5 V — 0.15 0.3 V lO = 400 mA, VS = 24 V — 0.3 0.5 V RADJ = ∞, VO = 2 V 450 600 750 mA ICL = 10 mA, VCC = 0 17 18 20 V ICL = 250 mA, VCC = 0 19 20 22 V Output Current Limit lOMAX Output Clamp Voltage (Test Fig. 1) VCL Output Switching Time tPLH 50% VADJ to VO = 3.0 V, lO = 250 mA — — 5.0 µs Supply Current (Test Fig. 2) lCC RADJ = ∞, VS = 26 V, One Output ON — — 24 mA RADJ = 0 Ω, VS = 26 V, Outputs OFF — 8.0 10 mA * lO 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. www.allegromicro.com Continued next page... 3625 AND 3626 POWERHALL® SENSOR ICS/DRIVERS FOR BRUSHLESS DC MOTORS ELECTRICAL CHARACTERISTICS continued Limits Characteristic Symbol Test Conditions Min. Typ. Max. Units Both Operate Point§ BOP — ±100 ±150 G Hysteresis BH — 200 — G RADJ = 39 kΩ — 0.75 — — RADJ = 17 kΩ — 0.50 — — RADJ = 10 kΩ — 0.25 — — VADJ = 0 — -350 -500 µA VT = 14 V — — 10 µA IT = 750 µA — 0.2 0.4 V Output Current Limit Ratio PWM Control Current lO/lO MAX IADJ Tach Output Leak. Current Tach Output Sat. Voltage IT VT(SAT) Thermal Shutdown TJ –– 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. 1 TEST FIG. 2 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 3625 AND 3626 POWERHALL® SENSOR ICS/DRIVERS FOR BRUSHLESS DC MOTORS ELEMENT 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 (ICC 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: ICC 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 (DC 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 VS 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 (ZB) 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/IO ADJ pin. www.allegromicro.com 3625 AND 3626 POWERHALL® SENSOR ICS/DRIVERS FOR BRUSHLESS DC MOTORS 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 shutdown. 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 opencollector transistor (no pull-up resistor). PWM/lO ADJ input voltages greater than 0.3 V are not recommended and may create an unstable operating condition. TYPICAL FAN APPLICATION OUTA ON/LOW MAGNETIC FIELD DEFINITIONS S B=0G +B O P +B -B +B -B O P N Dwg. AP-001-1 OUTB ON/LOW Dwg. GP-008 By accepted magnetic convention, lines of flux emanate from the north pole of a magnet and enter the south pole. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 3625 AND 3626 POWERHALL® SENSOR ICS/DRIVERS FOR BRUSHLESS DC MOTORS Dimensions in Inches (controlling dimensions) 8 0.014 0.008 5 0.430 MAX 0.280 0.240 0.300 BSC 1 0.070 0.045 4 0.005 MIN 0.400 0.355 0.210 MAX 0.015 0.150 0.115 MIN 0.022 0.014 0.100 BSC 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. www.allegromicro.com Dwg. MA-001-8A in 3625 AND 3626 POWERHALL® SENSOR ICS/DRIVERS FOR BRUSHLESS DC MOTORS Dimensions in Millimeters (for reference only) 0.355 0.204 5 8 10.92 MAX 7.11 6.10 7.62 BSC 4 1 1.77 1.15 0.13 MIN 10.16 9.02 5.33 MAX 0.39 3.81 2.93 MIN 0.558 0.356 2.54 BSC Dwg. MA-001-8A mm 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; 5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719; 5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents pending. 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. 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 responsibility for its use; nor for any infringements of patents or other rights of third parties that may result from its use. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000