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October 2003
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WIDE SUPPLY VOLTAGE RANGE: 8 TO 35V
DC
s
BUILD-IN GATE DRIVE VOLTAGE CLAMP
TYP. 11V
s
LOGIC CONTROLLED ENABLING CIRCUIT
s
DIGITAL IN-RUSH TIMER
s
BUILT-IN POWER-ON RESET
s
INTERNALLY TRIMMED TIMING
OSCILLATOR
s
NO EXTERNALLY TIMING CAPACITORS
NEEDED
s
FIXED IN-RUSH/HOLD CURRENT RATIO
s
LOW DROP CURRENT SENSING
RESISTOR
s
INTEGRATED FILTER IN THE FEEDBACK
LOOP (TIME COSTANT OF 2s TYP.)
s
SO-8 PACKAGE
DESCRIPTION
This circuit is basically switch mode current
regulator with 2 modes (In-rush and Holding).
In-rush current occurs in the first 64 ms of each
on/off cycle with the rise time dependent on the
coil's resistance and inductance. The Hold-current
is a partition of the In-rush current fixed by the
ratio between V
1
and V
2
. A control pin is provided
for enabling and disabling the gate control output
for the external power MOS. The MOS transistor
must be chosen according to the supply voltage
range and
the current flowing
through the
solenoid.
ORDERING CODES
Type
Temperature
Range
Package
Comments
STM802BD
-40 to 85 C
SO-8 (Tube)
100 parts per tube / 20 parts per box
STM802BDR
-40 to 85 C
SO-8 (Tape & Reel)
2500 parts per reel
STM802
SOLENOID CONTROLLER IC
SO-8
STM802
3/8
TRUTH TABLES FOR ENABLE PIN
Note 1: The TST pin is for testing purpose only. Must be left FLOATING for normal operation.
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.
ELECTRICAL CHARACTERISTICS OVER RECOMMENDED OPERATING CONDITIONS
(Unless otherwise noted. Typical values are at T
A
= 25C)
EN
DEVICE
LOW
ENABLED
HIGH
DISABLED
FLOAT
DISABLED
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage
-0.5 to 40
V
V
I
DC Input Voltage of EN, FB
-0.5 to 7
V
I
IK
DC Input Diode Current
20
mA
I
OK
DC Output Diode Current
-
20/+5
mA
P
D
Maximum Power Dissipation
500
mW
T
L
Lead Temperature (10sec)
300
C
T
STG
Storage Temperature Range
-65 to 150
C
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
CC
Operative Supply Voltage Range
DC only
8
35
V
V
IL
Low Level Input Thresholds of Enable
0
0.8
V
V
IH
High Level Input Thresholds of Enable
2
5
V
V
HYST
Hysteresis of Enable Input
0.3
V
I
IN
Input Leakage Current of Enable
EN = GND
-100
-60
-30
A
EN = 5.5V, V
CC
= 0 to 35V
0.1
1
A
I
Q
Quiescent Supply Current
EN = 5.5V, V
CC
= 9V, V
FB
= 0V
0.4
0.9
mA
I
CC
Supply Current
EN = GND, V
CC
= 9V, V
FB
= 0V
C
LOAD
= 1000pF
0.7
1.2
mA
V
CLAMP
Gate drive voltage clamp
V
CC
> 20V
9
11
13
V
V
1
Voltage reference for Inrush current
314
345
380
mV
V
2
Voltage reference for Hold current
70
77
86
mV
I
INR
/I
HOLD
Inrush current to hold current ratio
4.5
T
INR
Time duration of Inrush interval
56
64
72
ms
I
GH
Gate control output source current
V
G
= 0V, V
CC
= 13V
-1.6
-1
mA
I
GL
Gate control output sink current
V
G
= 8V, V
CC
= 13V
2.5
4.5
mA
V
BYP
Internal Pre-regulator output voltage
I
BYP
= 1mA
4
V
T
C
Time constant of feedback filter
2
s
T
OP
Operative Temperature Range
-40
85
C
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