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CS1108
Single Lamp Driver IC
This ASIC provides up to 350 mA of drive current for powering
bulbs. The typical application for this part is for use in airbag systems
using a type 194 bulb. On–chip diagnostics provide open circuit and
short circuit detection in the output on mode. In addition, the output
driver will turn on (sink current) when VCC is low. Fault is an
active–low output which reports in the output–on mode. Internal
pull–up circuitry is provided to ensure the output pin turns on when the
Control pin is floating.
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Features
• Fault Detection
– Open Circuit
– Short Circuit
– Overtemperature
• VCC Sense: Output Turns On with Loss of VCC
• Low Standby Current
• Internally Fused Leads in SO–8 Package
SO–8
DF SUFFIX
CASE 751
PIN CONNECTIONS AND
MARKING DIAGRAM
Output
VCC
8
1108
ALYW
VCC
Fault
1
Control
VCC(SENSE)
ISOURCE
GND
GND
GND
GND
Output
Drive &
Bias
A
WL, L
YY, Y
WW, W
Control
Overtemp
Shutdown
= Assembly Location
= Wafer Lot
= Year
= Work Week
Duty cycle
during short
circuit
ORDERING INFORMATION
Device
+
–
Fault
–
+
GND GND
GND
Short Circuit
Detect
Package
Shipping
CS1108EDF8
SO–8
95 Units/Rail
CS1108EDFR8
SO–8
2500 Tape & Reel
Open Circuit
Detect
GND
Figure 1. Block Diagram
Semiconductor Components Industries, LLC, 2001
April, 2001 – Rev. 6
1
Publication Order Number:
CS1108/D
CS1108
MAXIMUM RATINGS*
Rating
Value
Unit
Storage Temperature
–65 to +150
°C
VCC, Fault, Control
–0.5 to 6.0
V
2.0
kV
40
V
230 peak
°C
ESD Capability (Human Body Model)
Peak Transient Voltage (output off mode, output pin only)
(26 V Load Dump @ 14 V VBAT)
Lead Temperature Soldering:
Reflow: (SMD styles only) (Note 1)
1. 60 second maximum above 183°C.
*The maximum package power dissipation must be observed.
ELECTRICAL CHARACTERISTICS (4.75 ≤ VCC ≤ 5.25 V, –40°C ≤ TA ≤ 85°C, –40°C ≤ TJ ≤ 150°C; unless otherwise specified.)
Characteristic
Test Conditions
Min
Typ
Max
Unit
Supply Requirements
VCC Quiescent Current
Output ON
–
3.0
6.0
mA
VCC Quiescent Current
Output OFF
–
100
250
µA
Leakage Current
VBAT = 14 V
–
16
100
µA
Saturation Voltage
IOUTPUT = 350 mA
IOUTPUT = 180 mA
–
–
1.1
0.9
1.5
1.3
V
V
VOUTPUT (self–bias)
VCC < 4.5 V, IOUTPUT < 200 mA
–
–
3.5
V
Output
Current Sense
Short Circuit Current
–
350
500
650
mA
Open Circuit Current
Output in the ON state
20
40
60
mA
Input Voltage
Logic = High
Logic = Low
2.0
–
–
–
–
0.8
V
V
Input Current
Logic = VCC
Logic = 0 V
–
–50
20
–20
40
–
µA
µA
–
0.24
0.40
V
Control–Input
Fault Output – (Open Collector)
Output Low Voltage
IFAULT = 250 µA (sink)
Overtemperature Shutdown
TJ Output Disable Threshold
(Guaranteed by Design)
150
180
–
°C
TJ Hysteresis
(Guaranteed by Design)
5.0
–
–
°C
Note: A fault signal will be shown (at the fault pin) during inrush as the short circuit threshold is exceeded.
PACKAGE PIN DESCRIPTION
PACKAGE PIN #
8 Lead SO Narrow
PIN SYMBOL
1
Output
2
VCC
5.0 V regulated supply input.
3
Fault
Open collector diagnostic output low during open load, short
circuit and overtemperature conditions.
4
Control
TTL compatible input.
5, 6, 7, 8
Ground
Signal ground.
FUNCTION
Open collector output.
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CS1108
CIRCUIT DESCRIPTION
Typical lamps have a low resistance when off and the
current will exceed the current limit threshold during the
initial inrush period. During this inrush time, the IC will be
operating in the duty cycle mode. Due to characteristics of
lamps in this mode, they may appear dimly lit. This
condition will persist for a breif time until the lamp
resistance has increased enough to reduce it’s current below
the threshold. Once this occurs the lamp will appear at full
brightness. During the inrush period the Fault pin will be
forced low indicating that duty cycle mode is in operation.
Thermal protection has been designed into this IC. Should
duty cycle mode operate for an extended amount of time and
the power limitations of the IC are exceeded the IC die
temperature will rise. Once the die temperature reaches the
thermal temperature limit, the internal cicuitry will shutoff
the output and the lamp will turn off. Once the die temperature
lowers below the thermal threshold, the output will be
allowed to turn back on.
The CS1108 lamp driver IC provides up to 350 mA of
drive current in a low–side configuration. The Output driver
pin is controlled through the TTL compatible Control input
pin. A high condition on the Control pin turns the output pin
on.
The Fault pin reports short circuit, open circuit, and
overtemperature conditions on the IC. If a fault is present,
the open collector output Fault pin will be low. Typical
numbers for faults are: exceeding 500 mA of drive current
will report a short circuit. Less than 40 mA (typical) will
report an open circuit. A temperature fault will be reported
when the die temperature exceeds 180°C (typical). Faults
are only reported when the Control pin is high, due to the low
quiescent current when the Control pin is low and the output
device is turned off.
The CS1108 is designed to provide overcurrent protection
by duty cycle control. When the lamp current exceeds the
internally programmed current limit threshold (typically
500 mA), the output enters duty cycle mode to reduce power
dissipation of the IC to a safe level.
Output
CS1108
10 nF
VCC
GND
Fault
GND
Control
GND
20 k
VBAT
GND
VCC
microprocessor
Figure 2. Applications Diagram
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CS1108
PACKAGE DIMENSIONS
SO–8
DF SUFFIX
CASE 751–07
ISSUE V
–X–
A
8
5
0.25 (0.010)
S
B
1
M
Y
M
4
K
–Y–
G
C
N
DIM
A
B
C
D
G
H
J
K
M
N
S
X 45
SEATING
PLANE
–Z–
0.10 (0.004)
H
M
D
0.25 (0.010)
M
Z Y
S
X
J
S
MILLIMETERS
MIN
MAX
4.80
5.00
3.80
4.00
1.35
1.75
0.33
0.51
1.27 BSC
0.10
0.25
0.19
0.25
0.40
1.27
0
8
0.25
0.50
5.80
6.20
INCHES
MIN
MAX
0.189
0.197
0.150
0.157
0.053
0.069
0.013
0.020
0.050 BSC
0.004
0.010
0.007
0.010
0.016
0.050
0
8
0.010
0.020
0.228
0.244
PACKAGE THERMAL DATA
SO–8
Unit
RΘJC
Typical
25
°C/W
RΘJA
Typical
110
°C/W
Parameter
ON Semiconductor and
are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes
without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular
purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability,
including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or
specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be
validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others.
SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or
death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold
SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable
attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim
alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer.
PUBLICATION ORDERING INFORMATION
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Phone: 303–675–2175 or 800–344–3860 Toll Free USA/Canada
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4–32–1 Nishi–Gotanda, Shinagawa–ku, Tokyo, Japan 141–0031
Phone: 81–3–5740–2700
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For additional information, please contact your local
Sales Representative.
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CS1108/D
