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Features
* * * * * *
Three Input Comparators with Schmitt-trigger Characteristic Input Clamping Current Capability of 10 mA Integrated Protection Cells (EMC, ESD, RF) Dedicated to all Input Stages Common Shutdown by Junction-temperature Monitor Reset with Hysteresis at Low Voltage ESD Protection According to Human Body Model: 2000V (C = 100 pF, R = 1.5 k) * Output Stages: - Short-circuit Protected - Load-dump Protected at 1 k - No Crosstalk on Adjacent Channels - Jump Start Possible
Triple Driver IC with Thermal Monitoring U6803B
1. Description
The triple driver IC includes three non-inverted and current-limited output stages with an open collector. Common thermal shutdown protects the outputs against critical junction temperatures. Each output can sink a current of 20 mA, parallel output operation is possible. The digital inputs have Schmitt-trigger function with pull-up resistors to 5 V. Figure 1-1. Block Diagram
VO1 1 3 VO2 VO3 4
VS
7
Thermal shutdown
2
GND
Undervoltage detection VS = 5 V 8 VI1 6 VI2 5 VI3 VS
Rev. 4762B-AUTO-09/05
2. Pin Configuration
Figure 2-1. Pinning SO8
VO1
1
8
VI1
GND
2
7
VS
VO2
3
6
VI2
VO3
4
5
VI3
Table 2-1.
Pin 1 2 3 4 5 6 7 8
Pin Description
Symbol VO1 GND VO2 VO3 VI3 VI2 VS VI1 Function Output 1 Ground Output 2 Output 3 Input 3 Input 2 Supply voltage 5V Input 1
3. Basic Circuitry
The integrated circuit U6803B requires a stabilized supply voltage (VS = 5V 5%) to comply with its electrical characteristics. An external buffer capacitor of C = 100 nF is recommended. An integrated 14V Zener diode between VS and ground protects the supply pin. All input stages are provided with an integrated 250 k pull-up resistor and can be directly connected to a microcontroller. All output stages are open collectors, each capable of sinking 20 mA. Recommended external components: * Pull-up resistor, R = 1 k * Capacitor to GND, C = 470 pF, see Figure 4-1 on page 3
2
U6803B
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U6803B
4. Functional Description
4.1 General
ON state: A low level at the input stage activates the corresponding output stage. OFF state: The internal pull-up resistor provides a high level to the input comparator and deactivates the output stage. 7V Zener diodes between each input pin and GND are capable of 10 mA clamping currents without crosstalk on adjacent input stages. A total clamping current of 30 mA should be observed with respect to the power dissipation.
4.2
Current Limitation of the Output Stages and Overtemperature Shutdown
A temperature-dependent current limitation in the range of 25 mA to 100 mA protects the stages in case of a short. Additionally, the chip temperature is monitored. For TChip > 148C, all outputs are disabled and automatically enabled with a hysteresis of TChip > 5C.
4.3
Transients and Load Dump
An integrated 28V Zener diode protects each output stage against transients and load-dump (Schaffner pulses). With the help of an external 1 k resistor, the output transistor is capable of handling the corresponding current which flows during each of these conditions. Apart from that, the outputs are short-circuit and overload protected.
4.4
Low-voltage Detection
When the supply voltage is switched on, a power-on reset pulse is generated internally which disables all output stages until a defined supply-voltage level is reached. The low-voltage detection is provided with a hysteresis of Vhyst = 0.5V typically.
Figure 4-1.
Application Schematic
VS = 5 V VBatt Load 100 nF VI1 Microcontroller VI2 VI3 VO1 R R R 3 x 1 k
U6803B
VO2 VO3 C C C 3 x 470 pF
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5. Absolute Maximum Ratings
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Parameters Supply voltage Ambient temperature range Storage temperature range Maximum junction temperature Symbol VS Tamb Tstg Tj Value 7.0 -40 to +125 -50 to +150 +150 Unit V C C C
6. Thermal Resistance
Parameters Junction ambient Symbol RthJA Value 160 Unit K/W
7. Electrical Characteristics
VS = 5V 5%, Tamb = 27C, reference point pin 2 (GND), unless otherwise specified, see Figure 1-1 on page 1 and Figure 4-1 on page 3 Parameters Supply, Pin 7 Supply voltage Supply current Low-voltage detection threshold Low-voltage hysteresis Temperature shutdown Temperature shutdown hysteresis Input; Pins 5, 6, 8 Zener-diode protection voltage Zener-diode clamping current Pull-up resistor Switching threshold Hysteresis Output; Pins 1, 3, 4 Zener-diode protection voltage Integrated capacitor Leakage current Saturation voltage Current limitation Propagation delay (470 pF, 1 k, 20V) (IO = 20 mA) ILeak VSat Ilimit td 25 IO = 10 mA VO 26.5 5 2.5 0.7 100 5 V pF A V mA s OFF ON II = 10 mA VI II RI VI VI Vhyst 170 250 3.3 1.8 1.5 6.7 8.5 10 305 V mA k V V V Inputs open Inputs closed to GND ON OFF VS IS IS VTH(ON) VTH(OFF) Vhyst TChip Thyst 4.75 0.8 7 3.7 3.0 0.55 140 5 5.25 3.2 13 4.6 3.8 1.05 149 V mA mA V V V C C Test Conditions Symbol Min. Typ. Max. Unit
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U6803B
8. Ordering Information
Extended Type Number U6803B-MFPY U6803B-MFPG3Y Package SO8 SO8 Remarks Tube, Pb-free Taped and reeled, Pb-free
9. Package Information
Package SO8
Dimensions in mm
5.00 4.85 1.4 0.4 1.27 3.81 8 5 0.25 0.10 0.2 3.8 6.15 5.85 5.2 4.8 3.7
technical drawings according to DIN specifications
1
4
10. Revision History
Please note that the following page numbers referred to in this section refer to the specific revision mentioned, not to this document. Revision No. 4762B-AUTO-09/05 History * Put datasheet in a new template * Pb-free Logo on page 1 added * Ordering Information on page 5 changed
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4762B-AUTO-09/05

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