U6801B
Rev. A3, 28-Mar-01 1 (5)
Single-Channel Driver with Thermal Monitoring
Description
The singel-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 5 V.
Features
Input comparator with Schmitt-trigger
characteristic
Input clamping current capability of10 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 acording to human body model:
2000 V (C = 100 pF, R = 1.5 k)
Output stage:
– Short-circuit protected
– Load-dump protected @ 1 k
– Jump start possible
Block Diagram / Applications
Under-
voltage
detection
7
1 3
n.c.
4
5
2
n.c
.VO
VS
VS
n.c. n.c. VI
GND
Thermal
shutdown
Figure 1. Block diagram / applications
Ordering Information
Extended Type Number Package Remarks
U6801B–FP SO8
U6801B
Rev. A3, 28-Mar-012 (5)
Pin Configuration
1
2
3
4
8
7
6
5
n.c.
GND
n.c.
VO
n.c.
VS
n.c.
VI
Figure 2. Pinning
Pin Symbol Function
1 n.c. Not connected
2 GND Ground
3 n.c. Not connected
4 VOOutput
5 VIInput
6 n.c. Not connected
7 VSSupply voltage 5 V
8 n.c. Not connected
Basic Circuitry
The integrated circuit U6801B requires a stabilized
supply voltage (VS = 5 V5%) to comply with its
electrical characteristics. An external buffer capacitor of
C = 100 nF value is recommended. An integrated 14-V
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 3
Functional Description
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 7-V Zener diode between input pin and GND is capable
of 10 mA clamping current.
Current Limitation of the Output Stages
and Overtemperature Shut-down
A temperature-dependent current limitation in the range
of 25 to 100 mA protects the stage in case of a short.
Additionally, the chip temperature is monitored. For Tchip
> 148C, the output is disabled and automatically
enabled with a hysteresis of TChip > 5C.
Transients and Load Dump
An integrated 28-V Zener diode protects the output stage
against transients and load-dump (Schaffner pulses).
With the help of external 1-k resistor, the output
transistor is capable to handle the corresponding current
which flows during each of these conditions. Apart from
that, the output is short circuit and overload protected.
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 = 0.5 V typically.
U6801B
Rev. A3, 28-Mar-01 3 (5)
VS=5 V
VIV
C
R
VBatt
1kΩ
470 pF
Load
100 nF
Micro–
controller U6801B O
Figure 3. Application schematic
Absolute Maximum Ratings
Parameters Symbol Value Unit
Supply voltage VS7.0 V
Ambient temperature range Tamb –40 to +125 C
Storage temperature range Tstg –50 to +150 C
Maximum junction temperature Tj+150 C
Thermal Resistance
Parameters Symbol Value Unit
Junction ambient RthJA 160 K/W
Electrical Characteristics
VS = 5 V5%, Tamb = 27C, reference point pin 2 (GND), unless otherwise specified, see figures 1 and 3.
Parameters Test Conditions / Pins Symbol Min. Typ. Max. Unit
Supply Pin 7
Supply voltage VS4.75 5.25 V
Supply current Input open
Input closed to GND IS
IS
0.8
73.2
13 mA
mA
Low-voltage detection
threshold: ON
OFF VTH(ON)
VTH(OFF)
3.7
3.0 4.6
3.8 V
V
Low-voltage hysteresis Vhyst 0.55 1.05 V
Temperature shutdown TChip 140 149 C
Temperature shutdown
hysteresis Thyst 5C
U6801B
Rev. A3, 28-Mar-014 (5)
Electrical Characteristics (continued)
VS = 5 V5%, Tamb = 27C, reference point pin 2 (GND), unless otherwise specified, see figures 1 and 3.
Parameters Test Conditions / Pins Symbol Min. Typ. Max. Unit
Input Pin 5
Zener-diode protection
voltage II = 10 mA VI6.7 8.5 V
Zener-diode clamping
current II10 mA
Pull-up resistor RI170 250 305 k
Switching threshold OFF
ON VI
VI
3.3
1.8 V
V
Hysteresis Vhyst 1.5 V
Output Pin 4
Zener-diode protection
voltage IO = 10 mA VO26.5 V
Integrated capacitor 5 pF
Leakage current ILeak 2.5 A
Saturation voltage (IO = 20 mA) VSat 0.7 V
Current limitation Ilimit 25 100 mA
Propagation delay (470 pF, 1 k, 20 V) td5s
Package Information
13034
technical drawings
according to DIN
specifications
Package SO8
Dimensions in mm 5.00
4.85
0.4
1.27 3.81
1.4
0.25
0.10
5.2
4.8
3.7
3.8
6.15
5.85
0.2
85
14
U6801B
Rev. A3, 28-Mar-01 5 (5)
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