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UDN2987X-6
DABIC-5 8-Channel Source Driver with Overcurrent Protection
Package A, 20-pin DIP
Package LW, 20-pin SOIC-W
Approximate Scale 1:1
Providing overcurrent protection for each of its eight sourcing outputs, the UDN2987A-6 and UDN2987LW-6 drivers are used as an interface between standard low-level logic and relays, motors, solenoids, LEDs, and incandescent lamps. These devices include thermal shut down and output transient protection/clamp diodes for use with sustaining voltages to 35 V. In these drivers, 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 by pulling the common OE/R input high. When OE/R is low, all outputs are inhibited and the eight latches are reset. The OE/R function can be especially important during power-up, in preventing floating inputs from turning on the outputs. Under normal operating conditions, each of eight outputs will source in excess of 100 mA continuously at an ambient temperature of 25C and a supply of 35 V. The over-current fault circuit will protect the device from short-circuits to ground with supply voltages of up to 30 V. 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 their predecessor devices, the UDN2987A and UDN2987LW, the UDN2987A-6 and UDN2987LW-6 have 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 UDN2987A-6 is supplied in a 20-pin dual in-line plastic (DIP) package; the UDN2987LW-6 is supplied in a 20-lead small-outline (SOIC-W) plastic package. The Pb (lead) free versions have 100% matte-tin leadframe plating.
Features
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 Shut Down (TSD)
Applications
Relays Motors Solenoids LEDs Incandescent lamps
Typical Application
IN1 IN2 IN3 IN4 CPU IN5 IN6 IN7 IN8 FAULT OE/R OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 OUT7 OUT8 GND VS 4.75 to 35 V
2987
1 to 8 Load Components
29876DS
UDN2987X-6
DABIC-5 8-Channel Source Driver with Overcurrent Protection
Selection Guide
Part Number
UDN2987A-6-T UDN2987LW-6-T UDN2987LWTR-6-T
Pb-free*
Yes Yes Yes
Packing
18 pieces/tube 37 pieces/tube 1000 pieces/13-in. reel
Package
20-pin DIP 20-pin SOIC, wide body
*Pb-based variants are being phased out of the product line. The variants cited in this footnote are in production but have been determined to be LAST TIME BUY. This classification indicates that sale of this device is currently restricted to existing customer applications. The variants should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available. Status change: October 31, 2006. Deadline for receipt fo LAST TIME BUY orders: April 27, 2007. These variants include: UDN2987A-6, UDN2987LW-6, and UDN2987LWTR-6.
Absolute Maximum Ratings
Parameter Supply Voltage Continuous Output Current* FAULT Output Voltage FAULT Output Current Input Voltage Junction Temperature Storage Temperature Range Operating Temperature Range Symbol VS IOUT VCE IC VIN TJ TS TA Outputs are disabled at approximately -500 mA Conditions Min. - -500 - - -0.3 - -55 -20 Max. Units 35 - 35 30 14 150 150 85 V mA V mA V C C C
*For input and output current specifications, negative current is defined as coming out of (sourcing) the specified device pin.
29876DS, Rev. 1pb
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
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UDN2987X-6
DABIC-5 8-Channel Source Driver with Overcurrent Protection
Functional Block Diagram
VS
Thermal Shut Down
OE/R
FAULT
R Q
S
IN1 OUT1
Driver 1 of 8 drivers IN8 OUT8
GND
Pin-Out Diagram
IN1 IN2 IN3 IN4 IN5 IN6 IN7 IN8 FAULT OE/R 1 2 3 4 5 6 7 8 9 10
x8 OEN
FF
20 19 18 17 16 15 14 13 12
SENSEN
OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 OUT7 OUT8 GND VS
OE
11
Dwg. PP-067
Package A (DIP) shown. Package LW (SOIC-W) is electrically identical and has the same terminal number assignment.
29876DS
+ -
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/ R 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, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
3
UDN2987X-6
DABIC-5 8-Channel Source Driver with Overcurrent Protection
ELECTRICAL CHARACTERISTICS, valid at TA = 25C, VOER = 2.4 V, VS = 35 V, unless otherwise noted
Characteristic Supply Voltage Functional Range Output Leakage Current2 Output Sustaining Voltage Output Saturation Voltage Channel Shut Down Threshold2 Symbol VS IOUTCEX VOUT(sus) VOUT(SAT) IM ICEX VCE(SAT) VIN(ON) VIN(OFF) VIN = 2.4 V Input Current: INx, OE/R pins IIN(ON) IIN(OFF) Clamp Diode Leakage Current Clamp Diode Forward Voltage Supply Current Thermal Shut Down Thermal Hysteresis Reset Pulse Duration Propagation Delay Time Blank Time
1Typical
Test Conditions VIN = 0.4 V, all inputs simultaneously IOUT = -350 mA, L = 2.0 mH VIN = 2.4 V, IOUT = -100 mA VIN = 2.4 V, IOUT = -225 mA VIN = 2.4 V, IOUT = -350 mA VIN = 2.4 V, Vs = 30 V VCC = 35 V IC = 30 mA
Min. 4.75 -200 35 -- -- -- - -- -- 2.4 -- -- -- -- -- -- -- -- -- -- -- 1.0
Typ.1 -- <-5.0 -- 1.6 1.7 1.8 -500 <1.0 0.3 -- -- -- -- -- -- -- 1.5 7.0 6.0 165 15 -- 100 200 1.0
Max. 35 - -- 1.8 1.9 2.0 -370 100 0.8 -- 0.4 100 600 1000 15 50 1.8 18 12 -- -- -- 600 1000 --
Units V A V V V V mA A V V V A A A A A V mA mA C C s ns ns s
FAULT Leakage Current FAULT Saturation Voltage Input Voltage
VIN = 5.0 V VIN = 12 V VIN = 0.4 V VR = 35 V, TA = 70C IF = 350 mA VIN = 2.4 V, all inputs simultaneously; outputs open VIN = 0.4 V, all inputs simultaneously
IR VF IS(ON) IS(OFF) TJTSD TJTSDhys tRPD tPLH tPHL tBLANK
VS = 35 V, RL = 100 , CLOAD = 30 pF VS = 35 V, RL = 100 , CLOAD = 30 pF
-- -- --
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.
29876DS
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
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UDN2987X-6
DABIC-5 8-Channel Source Driver with Overcurrent Protection
THERMAL CHARACTERISTICS Characteristics Package Thermal Resistance*
*Additional
Symbol RJA
Test Conditions Package A, on 4-layer board based on JEDEC standard Package LW, on 4-layer board based on JEDEC standard
Rating 32 48
Unit C/W C/W
thermal information is available on the Allegro Web site.
Power Dissipation versus Ambient Temperature
4.0 3.5 3.0
ck Pa (R / A e C ag 32 =
2.5
JA
PD (W)
Pa (R cka
2.0 1.5 1.0 0.5 0
JA
g = e LW 48 C /W
W )
)
25
50
75 TA (C)
100
125
150
29876DS
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
5
UDN2987X-6
DABIC-5 8-Channel Source Driver with Overcurrent Protection
Characteristic Performance
Output Current Waveshapes
VIN(A) = VIN(B) OE/R ISH IOUT(A) IM IOUT(B)
Momentary fault or capacitive charging (<1s) --
tPLH
Output (A) shorted
tRTB
tPHL
tBLANK
Allowable Output Current as a Function of Duty Cycle
(UDN2987A-6 shown, multiply by 78% for UDN2987LW-6)
TA= 25C, VS = 35 V
400 350 Quantity of outputs conducting simultaneously 87 6 5 4 3 400 350
TA= 50C, VS = 35 V
Quantity of outputs conducting simultaneously 876 5 4 3 2
Collector Current (mA)
300 250 200 150 100 50 0
Collector Current (mA)
0 10 20 30 40 50 60 70 80 90 100
300 250 200 150 100 50 0
0
10
20
30
40
50
60
70
80
90
100
Duty Cycle (%)
Duty Cycle (%)
29876DS
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
6
UDN2987X-6
DABIC-5 8-Channel Source Driver with Overcurrent Protection
Applications Information and Circuit Description
As with all power integrated circuits, the UDN2987A-6 and UDN2987LW-6 have 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 shut down. 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. All outputs are enabled by pulling the OE/R input high. When OE/R is low or allowed to float (internal pull-down), all outputs are inhibited and the latches are reset. Note that the reset pulse duration (OE/R low) should be at least 1 s. This will ensure safe operation under attempted reset conditions with a shorted load. The latches are also reset during power-up, regardless of the state of the OE/R input. 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 s blanking delay, t BLANK, 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, permissable current in excess of the trip current before the output driver is turned off. A common thermal shut down disables all outputs if the chip temperature exceeds 165C. At thermal shut down, all latches are reset. The outputs are disabled until the chip cools down to approximately 150C (thermal hysteresis). In the event of an overcurrent condition on any channel, or chip thermal shut down, the FAULT open-collector output is pulled low (turned on).
Overcurrent Fault Sense Circuit
VS
+
VREF Matched
+
VSENSE
To Fault Latch
- +
-
SENSE
-
REF
ILOAD IREF
29876DS
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
7
UDN2987X-6
DABIC-5 8-Channel Source Driver with Overcurrent Protection
Package A, 20-Pin DIP
1.060 26.92 0.980 24.89 20 .430 10.92 MAX A B .014 0.36 .008 0.20
Preliminary dimensions, for reference only Dimensions in inches Metric dimensions (mm) in brackets, for reference only (reference JEDEC MS-001 AD) 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
.280 7.11 .240 6.10 A 1 2
.300 .7.62
.195 4.95 .115 2.92 .015 2.92 MIN .005 0.13 MIN .070 1.78 .045 1.14 24X .022 .056 .014 .036 .010 [0.25] M C .100 .2.54 .150 3.81 .115 2.92
SEATING PLANE
C
Package LW, 20-pin SOIC-W
10.63 .419 9.97 .393 0.25 [.010] M B M 13.00 .512 12.60 .496 20 A B 8 0 0.33 .013 0.20 .008
Preliminary dimensions, for reference only Dimensions in millimeters U.S. Customary dimensions (in.) in brackets, for reference only (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 1
7.60 .299 7.40 .291 A 1.27 .050 0.40 .016
2 0.25 .010
20X 0.10 [.004] C 20X 0.51 .020 0.31 .012 0.25 [.010] M C A B 1.27 .050
SEATING PLANE 2.65 .104 2.35 .093 0.30 .012 0.10 .004
C
SEATING PLANE GAUGE PLANE
29876DS
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
8
UDN2987X-6
DABIC-5 8-Channel Source Driver with Overcurrent Protection
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. 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 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 infringement of patents or other rights of third parties which may result from its use. Copyright(c)2006, Allegro MicroSystems, Inc.
29876DS
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
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