UDN2987x-6 DABIC-5 8-Channel Source Driver with Overcurrent Protection Features and Benefits Description ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ Providing overcurrent protection for each of its eight sourcing outputs, the UDN2987LW-6 driver is used as an interface between standard low-level logic and relays, motors, solenoids, LEDs, and incandescent lamps. This device includes thermal shutdown and output transient protection/clamp diodes for use with sustaining voltages to 35 V. 4.75 to 35 V driver supply voltage Output enable-disable (OE/R) 350 mA output source current Overcurrent protected Internal ground clamp diodes Output Breakdown Voltage 35 V minimum TTL, DTL, PMOS, or CMOS compatible inputs Internal Thermal Shutdown (TSD) In this driver, each channel includes a latch to turn off that channel if the maximum channel current is exceeded. All channels are disabled if the thermal shutdown is activated. A common FAULT output is used to indicate either chip thermal shutdown or any overcurrent condition. All outputs are enabled ¯ is low, by pulling the common OE/R input high. When OE/R all outputs are inhibited and the eight latches are reset. The ¯ function can be especially important during power-up, OE/R in preventing floating inputs from turning on the outputs. Package: 20-pin SOICW (suffix LW) Under normal operating conditions, each of eight outputs will source in excess of 100 mA continuously at an ambient temperature of 25°C and a supply of 35 V. The overcurrent fault circuit will protect the device from short-circuits to ground with supply voltages of up to 30 V. Not to scale Continued on the next page… Typical Application IN1 OUT1 IN2 OUT2 IN3 OUT3 IN4 CPU IN5 2987 OUT4 OUT5 IN6 OUT6 IN7 OUT7 IN8 OUT8 FAULT OE/R¯ 1 to 8 Load Components GND VS 4.75 to 35 V 29876-DS, Rev. 6 DABIC-5 8-Channel Source Driver with Overcurrent Protection UDN2987x-6 Description (continued) The inputs are compatible with 5 and 12 V logic systems: TTL, Schottky TTL, DTL, PMOS, and CMOS. In all cases, the output is switched ON by an active high input level. Compared to predecessor devices, the UDN2987LW-6 has a significantly faster TPHL (200 ns typical) and a lower driver supply voltage rating (4.75 V), which allows the use of 5 V logic. The UDN2987LW-6 is supplied in a 20-lead small-outline (SOIC-W) plastic package. All packages are lead (Pb) free, with 100% mattetin leadframe plating. Selection Guide Part Number UDN2987LWTR-6-T Packing 1000 pieces/13-in. reel Package 20-pin SOIC, wide body Absolute Maximum Ratings Parameter Supply Voltage Symbol Notes Rating VS Continuous Output Current* IOUT FAULT Output Voltage VCE Outputs are disabled at approximately –500 mA Units 35 V –500 mA 35 V FAULT Output Current IC 30 mA Input Voltage VIN –0.3 to 14 V Junction Temperature TJ 150 °C Storage Temperature Range TS –55 to 150 °C Operating Temperature Range TA –20 to 85 °C Range N *For input and output current specifications, negative current is defined as coming out of (sourcing) the specified device pin. Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 2 DABIC-5 8-Channel Source Driver with Overcurrent Protection UDN2987x-6 Functional Block Diagram VS Thermal Shut Down OE/R¯ FAULT <1Ω + – R S Q IN1 OUT1 Driver 1 of 8 drivers IN8 OUT8 GND Pin-Out Diagram IN1 1 20 OUT1 IN2 2 19 OUT2 IN3 3 18 OUT3 IN4 4 17 OUT4 IN5 5 16 OUT5 IN6 6 15 OUT6 IN7 7 14 OUT7 IN8 8 13 OUT8 12 GND 11 VS FAULT 9 OE/R 10 x8 OE OEN FF SENSE N Dwg. PP-067 Terminal List Table Number Name 1 IN1 2 IN2 3 IN3 4 IN4 5 IN5 6 IN6 7 IN7 8 IN8 9 FAULT 10 OE/ R̄¯ 11 VS 12 GND 13 OUT8 14 OUT7 15 OUT6 16 OUT5 17 OUT4 18 OUT3 19 OUT2 20 OUT1 Description Logic input 1 Logic input 2 Logic input 3 Logic input 4 Logic input 5 Logic input 6 Logic input 7 Logic input 8 Fault output Logic input for Output Enable and Reset Supply voltage Supply ground Output 8 to load Output 7 to load Output 6 to load Output 5 to load Output 4 to load Output 3 to load Output 2 to load Output 1 to load Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 3 DABIC-5 8-Channel Source Driver with Overcurrent Protection UDN2987x-6 ELECTRICAL CHARACTERISTICS, valid at TA = 25°C, VOER = 2.4 V, VS = 35 V, unless otherwise noted Characteristic Supply Voltage Functional Range Symbol Test Conditions VS Typ.1 Max. 4.75 — 35 V – 200 <–5.0 – μA Min. Units Output Leakage Current2 IOUTCEX VIN = 0.4 V, all inputs simultaneously Output Sustaining Voltage VOUT(sus) IOUT = –350 mA, L = 2.0 mH 35 — — V VIN = 2.4 V, IOUT = –100 mA — 1.6 1.8 V VIN = 2.4 V, IOUT = –225 mA — 1.7 1.9 V VIN = 2.4 V, IOUT = –350 mA — 1.8 2.0 V Output Saturation Voltage Channel Shut Down Threshold2 FAULT Leakage Current FAULT Saturation Voltage Input Voltage ¯ pins Input Current: INx, OE/R VOUT(SAT) VIN = 2.4 V, Vs = 30 V – –500 – 370 mA ICEX IM VCC = 35 V — <1.0 100 μA VCE(SAT) IC = 30 mA — 0.3 0.8 V VIN(ON) 2.4 — — V VIN(OFF) — — 0.4 V VIN = 2.4 V — — 100 μA IIN(ON) VIN = 5.0 V — — 600 μA VIN = 12 V — — 1000 μA IIN(OFF) VIN = 0.4 V — — 15 μA Clamp Diode Leakage Current IR VR = 35 V, TA = 70°C — — 50 μA Clamp Diode Forward Voltage VF IF = 350 mA — 1.5 1.8 V IS(ON) VIN = 2.4 V, all inputs simultaneously; outputs open — 7.0 18 mA IS(OFF) VIN = 0.4 V, all inputs simultaneously — 6.0 12 mA — 165 — °C Supply Current Thermal Shut Down TJTSD Thermal Hysteresis TJTSDhys — 15 — °C tRPD 1.0 — — μs Reset Pulse Duration Propagation Delay Time Blank Time tPLH VS = 35 V, RL = 100 Ω, CLOAD = 30 pF — 100 600 ns tPHL VS = 35 V, RL = 100 Ω, CLOAD = 30 pF — 200 1000 ns — 1.0 — μs tBLANK 1Typical data are for initial design estimations only, and assume optimum manufacturing and application conditions. Performance may vary for individual units, within the specified maximum and minimum limits. 2For input and output current specifications, negative current is defined as coming out of (sourcing) the specified device pin. Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 4 DABIC-5 8-Channel Source Driver with Overcurrent Protection UDN2987x-6 THERMAL CHARACTERISTICS Characteristics Package Thermal Resistance* Test Conditions Rating Unit RθJA Package LW, on 4-layer board based on JEDEC standard 48 °C/W thermal information is available on the Allegro Web site. Power Dissipation versus Ambient Temperature 4.0 3.5 3.0 2.5 PD (W) *Additional Symbol Pa (R cka QJ 2.0 A g = e LW 48 ºC /W ) 1.5 1.0 0.5 0 25 50 75 100 125 150 TA (°C) Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 5 DABIC-5 8-Channel Source Driver with Overcurrent Protection UDN2987x-6 Characteristic Performance Output Current Waveshapes VIN(A) = VIN(B) tPLH — tPHL tRTB OE/R Output (A) shorted ISH IOUT(A) tBLANK IM IOUT(B) Momentary fault or capacitive charging (<1μs) Allowable Output Current as a Function of Duty Cycle (Multiply by 78% for UDN2987LW-6) TA= 25°C, VS = 35 V 400 250 200 150 100 50 Quantity of outputs conducting simultaneously 8 7 6 5 4 3 2 350 Collector Current (mA) 300 0 400 Quantity of outputs conducting simultaneously 8 7 6 5 4 3 350 Collector Current (mA) TA= 50°C, VS = 35 V 300 250 200 150 100 50 0 10 20 30 40 50 60 Duty Cycle (%) 70 80 90 100 0 0 10 20 30 40 50 60 70 80 90 100 Duty Cycle (%) Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 6 DABIC-5 8-Channel Source Driver with Overcurrent Protection UDN2987x-6 Applications Information and Circuit Description As with all power integrated circuits, the UDN2987LW-6 has a maximum allowable output current rating. The 500 mA rating does not imply that operation at that value is permitted or even obtainable. The channel output current trip point is specified as –370 mA, minimum; therefore, attempted operation at current levels greater than –370 mA may cause a fault indication and channel shutdown. The device is tested at a maximum of –350 mA and that is the recommended maximum output current per driver. It provides protection for current overloads or shorted loads up to 30 V. ¯ input high. All outputs are enabled by pulling the OE/R ¯ is low or allowed to float (internal pull-down), When OE/R all outputs are inhibited and the latches are reset. Note that ¯ low) should be at least 1 μs. the reset pulse duration (OE/R This will ensure safe operation under attempted reset conditions with a shorted load. The latches are also reset during ¯ input. power-up, regardless of the state of the OE/R The load current causes a small voltage drop across the internal low-value sense resistor. This voltage is com- pared to the voltage drop across a reference resistor with a constant current. The two resistors are matched to eliminate errors due to manufacturing tolerances or temperature effects. Each channel includes a comparator and its own latch. An overcurrent fault (VSENSE > VREF) will set the affected latch and shut down only that channel. All other channels will continue to operate normally. The latch includes a 1 μs blanking delay, tBLANK, to prevent unwanted triggering due to crossover currents generated when switching inductive loads. For an abrupt short circuit, the blanking and output switching times will allow a brief, permissible current in excess of the trip current before the output driver is turned off. A common thermal shutdown disables all outputs if the chip temperature exceeds 165°C. At thermal shutdown, all latches are reset. The outputs are disabled until the chip cools down to approximately 150°C (thermal hysteresis). In the event of an overcurrent condition on any channel, or chip thermal shutdown, the FAULT open-collector output is pulled low (turned on). Overcurrent Fault Sense Circuit VS + VREF To Fault Latch – + + Matched – VSENSE – SENSE REF ILOAD IREF Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 7 DABIC-5 8-Channel Source Driver with Overcurrent Protection UDN2987x-6 Package LW, 20-pin SOIC-W 12.80±0.20 4° ±4 20 20 +0.07 0.27 –0.06 7.50±0.10 10.30±0.33 A 1 2.25 9.50 +0.44 0.84 –0.43 2 1 2 0.65 0.25 20X SEATING PLANE 0.10 C 0.41 ±0.10 1.27 C SEATING PLANE GAUGE PLANE 1.27 B PCB Layout Reference View 2.65 MAX 0.20 ±0.10 For Reference Only Dimensions in millimeters (Reference JEDEC MS-013 AC) Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact case and lead configuration at supplier discretion within limits shown A Terminal #1 mark area B Reference pad layout (reference IPC SOIC127P1030X265-20M) All pads a minimum of 0.20 mm from all adjacent pads; adjust as necessary to meet application process requirements and PCB layout tolerances Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 8 DABIC-5 8-Channel Source Driver with Overcurrent Protection UDN2987x-6 Revision History Revision Revision Date Rev. 6 April 30, 2012 Description of Revision Update product availability Copyright ©2006-2013, Allegro MicroSystems, LLC Allegro MicroSystems, LLC 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’s products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, LLC assumes no responsibility for its use; nor for any infringement of patents or other rights of third parties which may result from its use. For the latest version of this document, visit our website: www.allegromicro.com Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 9