STMICROELECTRONICS L9377DIE1

L9377
®
DUAL INTELLIGENT POWER LOW SIDE SWITCH
DUAL POWER LOW SIDE DRIVER WITH 2 x
5A
LOW RDSON TYPICALLY 200mΩ @ TJ = 25°C
INTERNAL OUTPUT CLAMPING DIODES
VFB=50V FOR INDUCTIVE RECIRCULATION
LIMITED OUTPUT VOLTAGE SLEW RATE
FOR LOW EMI
µP COMPATIBLE ENABLE AND INPUT
WIDE OPERATING SUPPLY VOLTAGE
RANGE 4.5V TO 45V
REAL TIME DIAGNOSTIC FUNCTIONS:
- OUTPUT SHORTED TO GND
- OUTPUT SHORTED TO VSS
- OPEN LOAD
- LOAD BYPASS
DEVICE PROTECTION FUNCTIONS:
- OVERLOAD DISABLE
- REVERSE BATTERY UP TO -16V @ VS
- THERMAL SHUTDOWN
MULTIPOWER BCD TECHNOLOGY
DIE
ORDERING NUMBER: L9377DIE1
BCD mixed technology. It is especially intended
to drive valves in automotive environment. Its inputs are µP compatible for easy driving. Particular
care has been taken to protect the device
against failures, to avoid electro-magnetic interferences and to offer extensive real time diagnostic.
DESCRIPTION
The L9377 is a monolithic integrated dual low
side driver realized in an advanced MultipowerBLOCK DIAGRAM
IN1
OUT1
Channel 1
DIAG1
VS
EN
OUT2
Output
Control
IN2
RO
Overtemp
Q
DIAG2
R
S
Delay
Timer
Diagnostic
Control
Overload
Openload
Channel 2
GND
July 2000
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L9377
ABSOLUTE MAXIMUM RATINGS (no damage or latch)
Symbol
Value
Unit
VSDC
DC supply voltage
-16 to 45
V
VSTR
VIN,EN
VDDC
Transient supply voltage ( t ≤ 500ms )
Input voltage ( | ≤ | 10mA | )
60
-1.5 to 6
V
V
Diagnostic DC output voltage ( | ≤ | 50mA | )
DC output voltage
-0.3 to 16
45
V
V
60
V
VODC
VOTR
IO
IOR
EO
TjEO
Tj
Ta
TjDIS
Parameter
Transient output voltage ( RL ≥ 4Ω )
Output load current
internal limited
Reverse output current limited by load
-4
A
50
175
190
mJ
°C
°C
Junction temperature
-40 to +150
°C
Storage temperature
Thermal disable junction temp, threshold
-55 to +150
180 to 210
°C
°C
Switch-off energy for inductive loads (tEO = 250µs, T = 5ms)
Junction temperature during switch-off ∑t ≤ 30min
∑t ≤ 15min
ELECTRICAL CHARACTERISTICS (Operating Range) - The electrical characteristics are valid within
the below defined operative range, unless otherwise specified.
Symbol
Min.
Typ.
Max.
Unit
VS
VD
Board supply voltage
Stabilized diagnostic output
voltage
Parameter
Test Condition
4.5
-0.3
12
5
32
16
V
V
Tj1
Junction Temperature
-40
150
°C
Tj2
Junction temperature
∑t ≤ 15min *)
150
210
°C
*) Parameter will be guaranted by correlation
Symbol
Parameter
Value
Tj1
Test Condition
Min.
ISSB
VDL
Diagnostic ouput
low voltage
b)
c) VEN = L, VO ≥ VOUV
b)
c) VEN = VIN = H
b) ID = 2mA
c) ID = 1mA
IDLE
Diagnostic output
leakage current
VS = 0V or VS = open;
VD = 5.5V Tj ≤ 125°C
ID
Diagnostic output
current capability
Open load voltage
threshold
VD ≤ 16V
DIAG = L
VEN = X, VIN = L
Open load
difference voltage
threshold
b) VEN = X, VIN1,2 = L
16V ≥ VOC ≥ VOUV
VOC = output voltage of
other channel
c)
IS
VOUV
∆VOUV1,2
IOUC
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Static standby
supply current
DC supply current
Open load current
threshold
a) VEN = VIN = H
c)
Value
Tj2
Min.
Unit
Typ.
Max.
0.73
1.5
15
Max.
mA
mA
1.3
5
15
mA
mA
0.35
0.5
0.7
V
0.1
2
20
µA
2
6
30
0.51
x VS
VOC0.9V
0.55
x VS
VOC1.25V
0.59
x VS
VOC1.6V
VOC0.7V
VOC1.25V
VOC1.8V
100
20
320
480
mA
0.5
x VS
0.8
0.65
x VS
1.7
V
V1)
V
580
mA
mA
L9377
ELECTRICAL CHARACTERISTICS (continued)
Symbol
Parameter
Value
Tj1
Test Condition
Min.
Typ.
Max.
IOOC
Over load current
threshold
b)
5
7
VOCL
Output voltage
during clamping
IOCL ≥ 100mA
45
52
60
SON,OFF
Output (fall, rise)
slew rate
a) Fig. 2
200
1500
3200
Internal output pull
down resistor
VEN = L
10
20
40
Output on resistance
VS > 9.5V IO = 2A
Tj = 25°C;
Tj = 150°C
200
300
500
RIO
RDSON
V(EN,IN)L
Logic input low
voltage
V(EN,IN)H
Logic input high
voltage
V(EN,IN)hys
|IEN, IN| ≤ 10mA
Logic input
hysteresis
Value
Tj2
Min.
Max.
4
Unit
A
V
200
3500
V/rms
50
KΩ
mΩ
mΩ
-1.5
1
2
5.5
V
V
0.2
0.4
0.8
0.8
V
IEN
Enable input sink
current
1V ≤ VEN ≤ 5.5V
10
30
60
80
µA
IIN
Logic input sink
current
1V ≤ VIN ≤ 5.5V
40
95
180
240
µA
Output delay ON
time
Output delay OFF
time
Fig. 2
4
25
µs
15
30
µs
tD ON
tD OFF
tD H-L, Diag.
5
Diag. delay output
OFF time
5
tD IOu
Diagnostic open
load delay time
Fig. 4
tDOL
Diagnostic overload
delay switch-off time
Fig. 1
50
65
90
µs
8
50
µs
160
300
µs
a) 9V ≤ VS ≤ 16V (Nominal operating range)
RL ≤ 6Ω,
IO ≤ IOOC
b) 6.5V ≤ VS ≤ 16V (Diagnostic operation range)
c) 4.5V ≤ VS < 6.5V and 16V < VS ≤ 32V (Extended operation range)
1) Limit under evaluation.
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L9377
DIAGNOSTIC TABLE (Operating range: 4.5V ≤ VS ≤ 32V)
Conditions
Normal function
EN
IN
Out
Diag.
L
H
H
X
L
H
off
off
on (*)
L
L
H
L
X
off
H
H
GND short
VOtyp < 0.55V
Load bypass
VO1,2 ≥ 1.25V
H
L
off
Open load
IOtyp < 320mA
H
H
on (*)
L
Tj typ ≥ 175°C
Overtemperature (**)
X
X
L
H
off
off
H
L
Latched Over load IOmin > 5A
X
H
Reset over load latch
X
off
L
D.C.
D.C.
(*) for 4.5V ≤ VS < 6.5V, IO ≤ 2A diag. table is valid.
(**) If one diag. status shows the overtemp. recognition, in parallel this output will be switched OFF internally. The corresponding channel should
be switched OFF additional by its Input or ENABLE signal, otherwise the overload latch will be set after tDOL is passed. This behaviour will
be related to the overdrop sensing which will be used as over load recognition.
Figure 1: Diagnostic overload delay time
UI
5V
t
IO
IO SC
5A
IO UC
td OL
t
UD
5V
t
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L9377
Figure 2: Output slope.
U IN
5V
V (IN)H
V (IN)L
td on
t
td off
U OUT
VO C
0.85VO C
VS
VS-VO C C
0.85VS
VO UV
0.15VS
Soff
Son
t
V DIAG
VD
0.5V D
tD
t
H-L Diag
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L9377
Figure 3: Block diagram - Open load voltage detection.
VBatt.
L1
L2
OUT1
OUT2
IN1
IN2
R IO
R IO
VS
55%
&
&
R
Latch
S
R
Q
S
Latch
Q
6/9
&
&
VO UV1
VO UV2
-
+
+
-
Enable
VD
IO u
IO o
VO u
V IN
normal
operation
OFF
td IO
td on
u
normal
operation
ON
open load
current
td OL
over load
current
latched over.
load diagnostic
td IO
td on
u
normal
operation
ON
td off
open load voltage
V EN
normal
operation
OFF
open load
voltage
L9377
Figure 4: Logic diagram.
7/9
open load current
latch reset
open load current
L9377
CIRCUIT DESCRIPTION
The L9377 is a dual low side driver for inductive
loads like valves in automotive environment. The
device is enabled by a common CMOS compatible ENABLE high signal. The internal pull down
current sources at the ENABLE and INPUT pins
protect the device in open input conditions
against malfunctions. An output slope limitation
for du/dt is implemented to reduce the EMI. An integrated active flyback voltage limitation clamps
the output voltage during the flyback phase to
50V.
Each driver is protected against short circuit and
thermal overload. In short circuit condition the
output will be disabled after a short delay time
tDOL to suppress spikes. This disable is latched
until a negative slope occure at the correspondent
input pin. The thermal disable for TJ > 175°C of
the output will be reseted if the junction temperature decreases about 20°C below the disable
threshold temperature.
For the real time error diagnosis the voltage and
the current of the outputs are compared with internal fixed values VOUV for OFF and IOUC for ON
conditions to recognize open load (RL ≥ 20KΩ, RL
> 38Ω) in ON and OFF conditions. The diagnostic
operates also in the extended supply voltage
range of 4.5V ≤ VS ≤ 32V.
Also the output voltages VO1,2 are compared
against each other in OFF condition with a fixed
offset of ∆VOUV 1,2 to recognize GND bypasses.
To suppress mail ∆VO diagnoses during the flyback phases of the compared output, the ∆VO diagnostic includes a latch function. Reaching the
flyback clamping voltage VOC the diagnostic signal is reseted by a latch. To activate again this
kind of diagnostic a low signal at the correspondent INPUT or the ENABLE pin must occur (see
also Fig.3).
The diagnostic output level in connection with different ENABLE and INPUT conditions allows to
recognize different fail states, like overtemp, short
to VSS, short to GND, bypass to GND and disconnected load (see also page 7 diagnostic table).
The diagnostic output is also protected against
short to UDmax. Oversteping the over load current
threshold IOo, the output current will be limited internally during the diagnostic overload delay
switch-off time tDOL.
Figure 5: Application circuit diagram.
+5V
IN1
Z VALVE
Channel 1
OUT1
DIAG1
VS
EN
µP
Output
Control
Controller
OUT2
RO
Overtemp
IN2
R
Q S
Delay
Timer
Overload
DIAG2
Diagnostic
Control
Openload
Channel 2
GND
8/9
Z VALVE
V Batt
L9377
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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 STMicroelectronics. Specification mentioned in this publication are
subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products
are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
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