Cherry Semiconductor CS1108EDFR8, CS1108EDF8 Datasheet
Features
■ Fault Detection
Open Circuit
Short Circuit
Over Temperature
■ V
CC
Sense: Output Turns
On with Loss of V
CC
■ Low Standby Current
Package Options
CS1108
Single Lamp Driver IC
CS1108
Description
This ASIC provides up to 350mA 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 VCCis low. is an
active-low output which reports in
the output-on mode. Internal pullup circuitry is provided to ensure
the output pin turns on when the
Control pin is floating.
Fault
Block Diagram
Absolute Maximum Ratings
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65ûC to 150ûC
V
CC
, , Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to 6V
ESD Capability (Human Body Model). . . . . . . . . . . . . . . . . . . . . . . . . . . 2kV
Peak Transient Voltage (output off mode, output pin only)
(26V load Dump @ 14V V
BAT
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40V
Lead Temperature Soldering
Reflow (SMD styles only) . . . . 60 sec. max above 183¡C, 230¡C peak
Fault
Output
V
CC
Gnd
Gnd
Control
Gnd
Gnd
Fault
8 Lead SO
(internally fused leads)
1
Rev. 12/28/98
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Email: info@cherry-semi.com
Web Site: www.cherry-semi.com
A Company
¨
V
CC
V
CC(SENSE)
I
SOURCE
Drive
& Bias
Output
Control
Fault
Gnd Gnd Gnd
Gnd
Duty cycle
during
short circuit
Overtemp
Shutdown
+
short circuit
-
detect
open circuit
detect
+
1
Electrical Characteristics: 4.75V ² VCC² 5.25V, -40¡C ² TA² 85¡C; -40¡ ² TJ² 150¡C
CS1108
2
Package Pin Description
PACKAGE PIN # PIN SYMBOL FUNCTION
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
8 Lead SO Narrow
1 Output Open collector output.
2V
CC
5V regulated supply input.
3 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.
Fault
■ Supply Requirements
V
CC
Quiescent Current Output ON 3 6 mA
VCCQuiescent Current Output OFF 100 250 µA
■ Output
Leakage Current V
BAT
=14V 16 100 µA
Saturation Voltage I
OUTPUT
= 350mA 1.1 1.5 V
I
OUTPUT
= 180mA 0.9 1.3 V
V
OUTPUT
(self-bias) VCC< 4.5V, I
OUTPUT
< 200mA 3.5 V
■ Current Sense
Short Circuit Current 350 500 650 mA
Open Circuit Current Output in the ON state 20 40 60 mA
■ Control - Input
Input Voltage Logic = High 2.0 V
Logic = Low 0.8 V
Input Current Logic = V
CC
20 40 µA
Logic = 0V -50 -20 µA
■ Fault Output - (Open Collector)
Output Low Voltage I
FAULT
= 250µA (sink) 0.24 0.40 V
■ Overtemperature Shutdown
TJOutput Disable Threshold (guaranteed by design) 150 180 ûC
TJHysteresis (guaranteed by design) 5 ûC
Note: A fault signal will be shown (at the fault pin) during inrush as the short circuit threshold is exceeded.
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