U4793B-MFPY - Atmel Corporation - Datasheet.Directory

Features

•

10 kV – 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

1. Description

The bipolar 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 = 44.5 mV. 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 break-

down 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.

2. Block Diagram

Figure 2-1. Schematic and Application Circuit

150 Ω

Batt

Load

0.6 V

OUT1

OUT2

Current Monitor

U4793B

Rev. 4557B–AUTO–09/05

4557B–AUTO–09/05

U4793B

3. Pin Configuration

Figure 3-1. Pinning DIP8/SO8

GND

OUT2

IN1

Input switch

VRef

IN2

OUT1

Table 3-1. Pin Description

Pin Symbol Function

1 GND Reference point, ground

2 VS Supply voltage

3 OUT2 Output 2

4 IN1 Input 1

5 OUT1 Output 1

6 IN2 Input 2

7 VRef Reference voltage

8 Input switch Input switch

4557B–AUTO–09/05

U4793B

4. 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

1.5

Output current, pins 3 and 5 I3,5 20 mA

Input voltage reference point pin 7, pins 4 and 6 –V4,6 6V

Power dissipation, Tamb = 125°C

DIP8

SO8 Ptot 220

150

Tamb = 95°C

DIP8

SO8 Ptot 420

360

Tamb = 60°C

DIP8

SO8 Ptot 690

560

Ambient temperature range Tamb –40 to +125 °C

Storage temperature range Tstg –55 to +125 °C

Junction temperature Tj150 °C

5. Thermal Resistance

Parameters Symbol Value Unit

Junction ambient

DIP8

SO8

RthJA

110

160

K/W

6. Electrical Characteristics

VS = 9V to 15V, Tamb = –40°C to +125°C, unless otherwise specified (see Figure 2-1 on page 1)

No. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Type*

1 Supply

1.1 Supply voltage 2, 7 VS915VA

1.2 Internal Z-diode Z22V

Z20 V A

1.3

Current consumption

VS = 12V measured

Tamb = –40°C 1I

13.5 4.8 6.0 mA C

1.4 VS = 12V measured

Tamb = 25°C 1I

12.8 3.4 6.0 mA A

1.5 VS = 12V measured

Tamb = 125°C 1I

12.0 2.6 3.2 mA C

*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter

4557B–AUTO–09/05

U4793B

2 Output

2.1 Output saturation

voltage

VS = 9V,

I3,5 = 10 mA

Tamb = 25°C

3, 5 Vsat 0.5 V A

2.2 Output Z-diodes Z3, Z53, 5 VZ21 V A

3 Control Signal

3.1

Control signal threshold

I3,5 = 1 mA, Figure 6-1

Tamb = –40°C 4, 6 –VT42 44 46 mV C

3.2 I3,5 = 1 mA, Figure 6-1

Tamb = 25°C 4, 6 –VT43 44.5 46 mV A

3.3 I3,5 = 1 mA, Figure 6-1

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

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

4 Threshold

4.1

Threshold voltage

Switch identification

Tamb = –40°C

V80.47 ×

0.69 ×

VSVC

4.2 Switch identification

Tamb = 25°C V80.47 ×

VS0.6 VS0.69 ×

VSVA

4.3 Switch identification

Tamb = 125°C V80.47 ×

0.69 ×

VSVC

5Switch Delay (R

L = 10 kΩ 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) 346µsC

5.2 Tamb = 25°C td(on) 468µsC

5.3 Tamb = 125°C td(on) 579µsC

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

6. Electrical Characteristics (Continued)

VS = 9V to 15V, Tamb = –40°C to +125°C, unless otherwise specified (see Figure 2-1 on page 1)

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

4557B–AUTO–09/05

U4793B

Figure 6-1. Timing Diagram

Figure 6-2. Threshold Voltage = f (VBatt and Temperature)

12.00

11.90

V4,6

d(off)

d(on)

10 20 30 40 50 60

(V)

(µs)

6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0

amb

= 125°C

-40°C

25°C

95°C

-V

( mV )

Batt

( V )

4557B–AUTO–09/05

U4793B

8. Package Information

7. Ordering Information

Extended Type Number Package Remarks

U4793B-MY DIP8 Tube, Pb-free

U4793B-MFPY SO8 Tube, Pb-free

U4793B-MFPG3Y SO8 Taped and reeled, Pb-free

9.8

9.5

Package DIP8

Dimensions in mm

1.64

1.44

4.8 max

0.5 min 3.3

0.58

0.48

7.62

2.54

6.4 max

0.36 max

9.8

8.2

7.77

7.47

technical drawings

according to DIN

specifications

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

4557B–AUTO–09/05

U4793B

9. 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

4557B-AUTO-09/05

• Put datasheet in a new template

• Pb-free logo on page 1 added

• Ordering Information on page 6 changed

Printed on recycled paper.

4557B–AUTO–09/05

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