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Features
* * * * * *
Input Comparator with Schmitt-trigger Characteristic Input Clamping Current Capability of 10 mA Integrated Protection Cells (EMC, ESD, RF) Dedicated to All Input Stages 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 Stage: - Short-circuit Protected - Load-dump Protected at 1 k - Jump Start Possible
Single-channel Driver IC with Thermal Monitoring T6801
1. Description
The single-channel driver IC includes one non-inverted and current-limited output stage with an open collector. Thermal shutdown protects the output against critical junction temperatures. The output can sink a current of 20 mA. The digital input has Schmitt-trigger function with pull-up resistors to 5V. Figure 1-1. Block Diagram
NC 1 3 NC VO 4
VS
7
Thermal shutdown
2
GND
Undervoltage detection 5 NC NC VI
VS
Rev. 4761B-AUTO-09/05
2. Pin Configuration
Figure 2-1. Pinning SO8
NC
1
8
NC
GND
2
7
VS
NC
3
6
NC
VO
4
5
VI
Table 2-1.
Pin 1 2 3 4 5 6 7 8
Pin Description
Symbol NC GND NC VO VI NC VS NC Function Not connected Ground Not connected Output Input Not connected Supply voltage 5V Not connected
3. Basic Circuitry
The integrated circuit T6801 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. The input stage is provided with an integrated 250 k pull-up resistor and can be directly connected to a microcontroller. The output stage is an open collector, 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
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T6801
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T6801
4. Functional Description
4.1 General
ON state: Low level at the input stage activates the output stage. OFF state: The internal pull-up resistor provides high level to the input comparator and deactivates the output stage. A 7V Zener diode between input pin and GND is capable of 10 mA clamping current.
4.2
Current Limitation of the Output Stages and Overtemperature Shutdown
A temperature-dependent current limitation in the range of 25 to 100 mA protects the stage in case of a short circuit. Additionally, the chip temperature is monitored. For TChip > 148C, the output is disabled and automatically enabled with a hysteresis of TChip > 5C.
4.3
Transients and Load Dump
An integrated 28V Zener diode protects the 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 output is 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 the output stage 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 R 1 k VO
Microcontroller
VI
T6801
C 470 pF
3
4761B-AUTO-09/05
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, Pin 5 Zener-diode protection voltage Zener-diode clamping current Pull-up resistor Switching threshold Hysteresis Output, Pin 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 Input open Input 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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T6801
8. Ordering Information
Extended Type Number T6801-TAQY Package SO8 Remarks 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. 4761B-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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4761B-AUTO-09/05
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Printed on recycled paper.
4761B-AUTO-09/05

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