L9305A
January 1992
DUAL HIGH CURRENT RELAY DRIVER
.
HIGH OUTPUT CURRENT
.
HYSTERESIS INPUT COMPARATOR WITH
WIDE RANGE COMMON MODE OPERATION
AND GROUND COMPATIBLE INPUTS
.
INPUT COMPARATOR HYSTERESIS
.
INTERNAL THERMAL PROTECTION WITH
HYSTERESIS
.
INTERNAL OUTPUT OVERVOLTAGE CLAMP-
ING
.
SINGLE SUPPLY VOLTAGE (3.5V up to 18V)
DESCRIPTION
The L9305A is a monolithic interface circuit with dif-
ferentialinput comparator and open collector output
able to sink high current specifically to drive relays,
lamps, d.c. motors.
Particular care has been taken to protect the device
against destructive failures - short circuit of outputs
to V
S
, output overvoltages, supply overvoltage.
1/6
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
A built in thermal shut-down switches off the device
when the IC's internal dissipation becomes too great
and the chip temperature exceeds a set security
threshold.
A hysteresis input comparatorincreases the interfa-
ce's noise immunity, allowing the correct use also in
critical environments as automotive or industrial ap-
plications.
Powerdip (8 + 8)
ORDERING NUMBER : L9305A
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
5
Supply Voltage
(*) 20
V
V
7
Driver Supply Voltage
26
V
I
ZS
Supply Zener Clamp Current (DC)
(PULSED) (**)
30
80
mA
mA
V
I
Comparator Input Voltage Range
0.2 to 24
V
V
I
Differential Input Voltage
24
V
T
j
, T
stg
Junction and Storage Temperature
55 to 150
C
P
tot
Power Dissipation at T
amb
= 85
C
928
mW
I
o
Output Current
Int. limited
(*)
The maximum allowed supply voltage without series resistors is limited by the built-in zener protection diodes
(**) T
on
2.5 ms ; repetit ion time
30 ms.
PIN CONNECTION (top view)
THERMAL DATA
Symbol
Parameter
Value
Unit
R
th j-pins
Thermal Resistance Junction to pins
Max.
15
C/W
R
th j-amb
Thermal Resistance Junction to Ambient
Max.
70
C/W
L9305A
2/6
ELECTRICAL CHARACTERISTICS (V
5
= 14.4V, T
amb
= 25
C ; refer to block diagram unless otherwise
specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
5
Supply Voltage
3.5
18*
V
I
S
"st.by"
Supply Current
V
I
+
V
I
70mV
5
8
mA
I
SON
Supply Current
V
I
V
I
+
> 70mV
18
30
mA
V
CZ
Output
Clamping
Voltage
(for
each channel)
I
OUT
= 1A
20
27
V
V
ZS
Supply Voltage Clamp
I
ZS
= 10mA
20
27
V
V
IH
Comparator Hysteresis
V
I
+
V
I
= 200mVpp
f = 1kHz
20
70
mV
I
B
Input Bias Current
V
+
= V
= 0V
0.2
1
A
I
OS
Input Offset Current
V
+
= V
= 0V
20
200
nA
CMR
Input Common Mode Range
V
5
= 3.5V to 18V
0
V
5
1.6
V
I
SC
Output Short Circuit Current for
Each Channel
V
I
V
I
+
70mV
V
out
= 16.5V
V
out
= 6V
0.85
A
2.5
A
I
CD
Driver
Transistor
Current
Capability
V
I
V
I
+
70mV
DC
Pulsed (**)
300
mA
600
mA
V
CSAT
On Status Saturation Voltage
V
I
V
I
+
70mV
I
CD
= 100mA
I
COUT
= 1.2A
1
V
I
OL
Output Leakage Current
V
I
+
V
I
70mV
250
A
*
T
ON
2.5 ms ; repetit ion time
30 ms.
** The maximum allowed supply voltage without limiting resistors is limited by the built-in protection zener diodes see V
CZ
, V
ZS
Spec. velues.
TEST AND APPLICATION CIRCUIT
L9305A
3/6
APPLICATION INFORMATIONS (refer to application circuit)
D1 and D2 diodes are required only for reverse po-
larity protection.
If V
S
may be higher than V
ZS
a resistor R
S
is neces-
sary to limit the zener current I
ZS
. In order to deter-
mine R
S
value the following equations can be used :
V
S MAX
V
D1
V
ZS min
1)
< I
ZS MAX
R
S
2) V
S min
V
D1
R
S
I
SON MAX
> V
ST min
where from T
amb
= 25
C :
- V
S MAX
and V
S min
are the maximum and minimum
values of power supply voltage
- V
D1
is the forward diode D1 voltage drop
- V
ZS min
= 20 V
- I
ZS MAX
= 30 mA for d.c. mode and I
ZS MAX
= 80 mA
for pulsed mode (see Absolute maximum ratings)
- I
SOM MAX
= 30 mA
- V
ST min
= 3.5 V
If no R
S
value can satisfy the system 1), 2) a more
powerfull external zener D
Z
= 18 V is required.
Then 1) becomes :
V
S MAX
V
D1
18
< I
DZ MAX
R
S
where I
DZ MAX
is the maximum allowed D
Z
current.
V
A
voltage cannot be higher than 20 V otherwise
output overvoltage protection may be activated.
Morever V
A
must be less than 16 V if short circuit
protection is required.
D
Z2
= 22 to 24 V is a mandatory for output 7 protec-
tion if V
S
may be higher than 26 V.
MOUNTING INSTRUCTION
The L9305A is assembled in a new plastic package,
the Powerdip, in which 8 pins (from 9 to 16) are at-
tached to the frame and remover the heat produced
by the chip.
Figure 2 and 3 show two ways of heatsinking. In the
first case, a PC board copper area is used as a
heatsink I = 65 mm. While in the second case, the
device is soldered to an external heatsink. In both
examples, the thermal resistance junction-ambient
is 35
C/W.
Figure 2 : Example of Heatsink Using PC Board
Copper (I = 65 mm).
Figure 3 : Example of an External Heatsink.
L9305A
4/6
POWERDIP16 PACKAGE MECHANICAL DATA
DIM.
mm
inch
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
a1
0.51
0.020
B
0.85
1.40
0.033
0.055
b
0.50
0.020
b1
0.38
0.50
0.015
0.020
D
20.0
0.787
E
8.80
0.346
e
2.54
0.100
e3
17.78
0.700
F
7.10
0.280
I
5.10
0.201
L
3.30
0.130
Z
1.27
0.050
L9305A
5/6
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for
the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its
use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifica-
tions mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information pre-
viously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or
systems without express written approval of SGS-THOMSON Microelectronics.
1994 SGS-THOMSON Microelectronics - All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
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L9305A
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