ATMEL U6803B User Manual

Triple Driver with Thermal Monitoring

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

Features

 Three input comparators with Schmitt-trigger

characteristic

current of 20 mA, parallel output operation is possible.
The digital inputs have Schmitt-trigger function with
pull-up resistors to 5 V.

 ESD protection acording to human body model:

2000 V (C = 100 pF, R = 1.5 k)

U6803B

 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

Block Diagram / Applications

V

O1

1 3

7

V

S

Thermal

shutdown

Under-

voltage

detection

V

O2

856

V

I1

 Output stages:
– Short-circuit protected
– Load-dump protected @ 1 k
– No crosstalk on adjacent channels
– Jump start possible

V

O3

4

VS=5 V

V

I2

V

I3

V

S

13332

2

GND

Figure 1. Block diagram

Ordering Information

Extended Type Number Package Remarks

U6803B–FP SO8

Rev. A6, 28-Mar-01 1 (6)

U6803B

Pin Description

V

O1

GND

V

V

O2

O3

1

2

3

4

13330

Figure 2. Pinning

V

8

I1

V

7

S

V

6

I2

V

5

I3

Basic Circuitry

The integrated circuit U6803B requires a stabilized
supply voltage (VS = 5 V5%) 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.

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:

Pin Symbol Function

1 V

O1

Output 1
2 GND Ground
3 V
4 V
5 V
6 V
7 V
8 V

O2
O3

I3
I2

I1

Output 2

Output 3

Input 3

Input 2

Supply voltage 5 V

S

Input 1

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 stages in case of a short.
Additionally, the chip temperature is monitored. For T

chip

> 148C, all outputs are disabled and automatically
enabled with a hysteresis of T

Chip

> 5C.

Transients and Load Dump

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
corresponding output stage.
OFF state: The internal pull-up resistor provides high
level to the input comparator and deactivates the output
stage.

7-V 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.

An integrated 28-V Zener diode protects each 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 outputs are 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 all output
stages until a defined supply-voltage level is reached. The
low-voltage detection is provided with a hysteresis of
V

= 0.5 V typically.

hyst

Rev. A6, 28-Mar-012 (6)

U6803B

VS=5 V

100 nF

V

I1

V

Micro–

controller

I2

U6803B

V

I3

Figure 3. Application schematic

Absolute Maximum Ratings

Parameters Symbol Value Unit
Supply voltage V
Ambient temperature range T
Storage temperature range T
Maximum junction temperature T

V

Batt

Load

RRR

V

O1

V

O2

V

O3

C C C

S

amb

stg

j

Ω

3x 1k

3x 470 pF

13333

7.0 V
–40 to +125 C
–50 to +150 C

+150 C

Thermal Resistance

Parameters Symbol Value Unit

Junction ambient R

thJA

Rev. A6, 28-Mar-01 3 (6)

160 K/W

U6803B

Electrical Characteristics

VS = 5 V5%, T

= 27C, reference point pin 2 (GND), unless otherwise specified, see figures 1 and 3.

amb

Parameters Test Conditions / Pins Symbol Min. Typ. Max. Unit

Supply Pin 7

Supply voltage V
Supply current Inputs open

Inputs closed to GND

Low-voltage detection
threshold:

ON
OFF

V

V
Low-voltage hysteresis V
Temperature shutdown T
Temperature shutdown

hysteresis

Input Pins 5, 6, 8

Zener-diode protection

I

= 10 mA V

I

voltage
Zener-diode clamping

current
Pull-up resistor R
Switching threshold OFF

ON

Hysteresis V

S

I

S

I

S

TH(ON)

TH(OFF)

hyst

Chip

T

hyst

I

I

I

I

V

I

V

I

hyst

4.75 5.25 V

0.8
7

3.7

3.0

3.2
13

4.6

3.8

mA
mA

0.55 1.05 V
140 149 C

5 C

6.7 8.5 V

10 mA

170 250 305 k

3.3

1.8

1.5 V

V
V

V
V

Output Pins 1, 3, 4

Zener-diode protection

I

= 10 mA V

O

O

26.5 V

voltage
Integrated capacitor 5 pF
Leakage current I
Saturation voltage (I

= 20 mA) V

O

Current limitation I
Propagation delay (470 pF, 1 k, 20 V) t

Leak

Sat

limit

d

25 100 mA

2.5 A

0.7 V

5 s

Rev. A6, 28-Mar-014 (6)

Package Information

Package SO8

Dimensions in mm

0.4

5.00

4.85

1.4

0.25

0.10

1.27

3.81

85

14

5.2

4.8

3.7

3.8

6.15

5.85

technical drawings
according to DIN
specifications

U6803B

0.2

13034

Rev. A6, 28-Mar-01 5 (6)

U6803B

Ozone Depleting Substances Policy Statement

It is the policy of Atmel Germany GmbH to

1. Meet all present and future national and international statutory requirements.

2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems
with respect to their impact on the health and safety of our employees and the public, as well as their impact on
the environment.

It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as
ozone depleting substances (ODSs).

The Montreal Protocol (1987) and its London Amendments (1990) intend to severely restrict the use of ODSs and forbid
their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these
substances.

Atmel Germany GmbH has been able to use its policy of continuous improvements to eliminate the use of ODSs listed
in the following documents.

1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively

2. Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental
Protection Agency (EPA) in the USA

3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C (transitional substances) respectively.

Atmel Germany GmbH can certify that our semiconductors are not manufactured with ozone depleting substances
and do not contain such substances.

We reserve the right to make changes to improve technical design and may do so without further notice.

Parameters can vary in different applications. All operating parameters must be validated for each customer

application by the customer. Should the buyer use Atmel Wireless & Microcontrollers products for any unintended

or unauthorized application, the buyer shall indemnify Atmel Wireless & Microcontrollers against all claims,

costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death

associated with such unintended or unauthorized use.

Data sheets can also be retrieved from the Internet: http://www.atmel–wm.com

Atmel Germany GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany

Telephone: [phone], Fax number: 49 (0)7131 67 2423

Rev. A6, 28-Mar-016 (6)