4557C–AUTO–06/12
Features
●10kV – ESD protection
●Two comparators with common reference
●Tight threshold tolerance
●Constant threshold
●NPN output
●Interference and damage-protection according to VDE 0839 and ISO/CD 7637 EMI
protection
●Reversal polarity protection
●Load-dump protection
Description
The bipolar Atmel® U4793B is designed to monitor overload or a short circuit in automotive
or industrial applications. The threshold is tied to V4,6 = VS – VT where VT= 44.5mV. It is
independent of the supply voltage, VS. If the voltage drop across shunt resistor, Rsh,
exceeds this value, the output is turned on, otherwise the output is turned off.
Without supply voltage or open input pin 8, the output is turned off. The output breakdown
voltage is determined by the Z-diodes Z3 and Z5 with a typical value of VZ=22V.
An unused comparator input must be connected to pin 7.
Atmel U4793B
Current Monitor IC
DATASHEET
2Atmel U4793B [DATASHEET]
4557C–AUTO–06/12
1. Block Diagram
Figure 1-1. Schematic and Application Circuit
2. Pin Configuration
Figure 2-1. Pinning SO8
-
+
-
+
-
+
&
&
Z
2
27
4
8
6
5
3
1
R
1150 Ω
V
S
V
Batt
R
sh
R
sh
Load
0.6 V
S
OUT1
OUT2
Z
5
Z
3
Table 2-1. Pin Description
Pin Symbol Function
1 GND Reference point, ground
2VS Supply voltage
3OUT2 Output 2
4 IN1 Input 1
5OUT1 Output 1
6 IN2 Input 2
7VRef Reference voltage
8Input switch Input switch
GND
VS
OUT2
IN1
Input switch
VRef
IN2
OUT1
1
2
3
4
8
7
6
5
3Atmel U4793B [DATASHEET]
4557C–AUTO–06/12
3. 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 Symbol Value Unit
Supply voltage; pins 2 and 7 VS16.5 V
Current consumption
t = 2 ms, measured at pin 1 (GND), pin 1 I11.5 A
Output current, pins 3 and 5 I3,5 20 mA
Input voltage reference point pin 7, pins 4 and 6 –V4,6 6 V
Power dissipation
Tamb = 125°C
Tamb = 95°C
Tamb = 60°C
Ptot
Ptot
Ptot
150
360
560
mW
mW
mW
Ambient temperature range Tamb –40 to +125 °C
Storage temperature range Tstg –55 to +125 °C
Junction temperature Tj150 °C
4. Thermal Resistance
Parameters Symbol Value Unit
Junction ambient RthJA 160 K/W
5. Electrical Characteristics
VS = 9V to 15V, Tamb = –40°C to +125°C, unless otherwise specified (see Figure 1-1 on page 2)
No. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Type*
1Supply
1.1 Supply voltage 2, 7 VS915 V A
1.2 Internal Z-diode Z22 VZ20 V A
1.3
Current consumption
VS = 12V measured
Tamb = –40°C 1 I13.5 4.8 6.0 mA C
1.4 VS = 12V measured
Tamb = 25°C 1 I12.8 3.4 6.0 mA A
1.5 VS = 12V measured
Tamb = 125°C 1 I12.0 2.6 3.2 mA C
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
4Atmel U4793B [DATASHEET]
4557C–AUTO–06/12
2Output
2.1 Output saturation
voltage
VS = 9V,
I3,5 = 10mA
Tamb = 25°C
3, 5 Vsat 0.5 V A
2.2 Output Z-diodes Z3, Z53, 5 VZ21 V A
3Control Signal
3.1
Control signal
threshold
I3,5 = 1mA, Figure 5-1
Tamb = –40°C 4, 6 –VT42 44 46 mV C
3.2 I3,5 = 1mA, Figure 5-1
Tamb = 25°C 4, 6 –VT43 44.5 46 mV A
3.3 I3,5 = 1mA, Figure 5-1
Tamb = 125°C 4, 6 –VT44.5 46 47.5 mV C
3.4
Temperature
coefficient of control
signal threshold
TC 15 µV/K C
3.5 Input currents
Pins connected
to 12V
Tamb = –40°C
4, 6
II100 190 nA C
3.6 Tamb = 25°C II60 100 150 nA A
3.7 Tamb = 125°C II30 110 nA C
3.8 Input currents
Pins connected
to 12V
Tamb = –40°C
8
II5.5 7.0 µA C
3.9 Tamb = 25°C II4.0 5.0 5.5 µA A
3.10 Tamb = 125°C II3.0 4.5 µA C
4Threshold
4.1
Threshold voltage
Switch identification
Tamb = –40°C
8
V8
0.47 ×
VS
0.69 ×
VS
V C
4.2 Switch identification
Tamb = 25°C V8
0.47 ×
VS
0.6 VS
0.69 ×
VS
V A
4.3 Switch identification
Tamb = 125°C V8
0.47 ×
VS
0.69 ×
VS
V C
5Switch Delay (RL = 10kΩ connected from Pin 3 or Pin 5 to VBatt)
5.1 Delay time
Switch-on
High to low
Tamb = –40°C
3, 5
td(on) 3 4 6 µs C
5.2 Tamb = 25°C td(on) 4 6 8 µs C
5.3 Tamb = 125°C td(on) 5 7 9 µs C
5.4 Delay time
Switch-off
Low to high
Tamb = –40°C td(off) 16 24 32 µs C
5.5 Tamb = 25°C td(off) 18 30 50 µs A
5.6 Tamb = 125°C td(off) 30 50 70 µs C
5. Electrical Characteristics (Continued)
VS = 9V to 15V, Tamb = –40°C to +125°C, unless otherwise specified (see Figure 1-1 on page 2)
No. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Type*
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
5Atmel U4793B [DATASHEET]
4557C–AUTO–06/12
Figure 5-1. Timing Diagram
Figure 5-2. Threshold Voltage = f (VBatt and Temperature)
12.00
11.90
12
V4,6
V0
t
d(off)
t
d(on)
10 20 30 40 50 60
0
t
(V)
(V)
6
(ms)
40
41
42
43
44
45
46
47
48
6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0
T
amb
= 125°C
-40°C
25°C
95°C
-V
T
(mV)
V
Batt
(V)
6Atmel U4793B [DATASHEET]
4557C–AUTO–06/12
7. Package Information
Figure 7-1. SO8
6. Ordering Information
Extended Type Number Package Remarks
U4793B-MFPY SO8 Tube, Pb-free
Package: SO 8
Dimensions in mm
specifications
according to DIN
technical drawings
Issue: 1; 15.08.06
Drawing-No.: 6.541-5031.01-4
14
85
0.2
5±0.2
3.8±0.1
6±0.2
3.7±0.1
4.9±0.1
3.81
0.4
1.27
0.1+0.15
1.4
7Atmel U4793B [DATASHEET]
4557C–AUTO–06/12
8. 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. History
4557C-AUTO-06/12
• Section 4 “Absolute Maximum Ratings” on page 3 changed
• Section 5 “Thermal Resistance” on page 3 changed
• Section 7 “Ordering Information” on page 6 changed
• Section 8 “Package Information” on page 6 changed
4557B-AUTO-09/05
• Put datasheet in a new template
• Pb-free logo on page 1 added
• Ordering Information on page 6 changed
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