L6370
2.5A HIGH-SIDE DRIVER
INDUSTRIAL INTELLIGENT POWER SWITCH
2.5A OUTPUT CURRENT
9.5V TO 35V SUPPLY VOLTAGE RANGE
INTERNAL CURRENT LIMITING
THERMAL SHUTDOWN
OPEN GROUND PROTECTION
INTERNAL NEGATIVE VOLTAGE CLAMPING
TO V
S
- 50V FOR FAST DEMAGNETIZATION
DIFFERENTIAL INPUTS WITH LARGE COM-
MON MODE RANGE AND THRESHOLD
HYSTERESIS
UNDERVOLTAGELOCKOUT WITH HYSTERESIS
OPEN LOAD DETECTION
TWO DIAGNOSTIC OUTPUTS
OUTPUT STATUS LED DRIVER
NON DISSIPATIVE SHORT CIRCUIT PRO-
TECTION
PROTECTION AGAINST AND SURGE TRAN-
SIENT (IEC 801-5)
IMMUNITY AGAINST BURST TRANSIENT
(IEC 801-4)
ESD PROTECTION (HUMAN BODY MODEL
2KV)
DESCRIPTION
The L6370 is a monolithic Intelligent Power
Switch in Multipower BCD Technology, for driving
inductive or resistive loads. An internal Clamping
Diode enables the fast demagnetization of induc-
tive loads. Diagnostic for CPU feedback and ex-
tensive use of electrical protections make this de-
vice extremely rugged and specially suitable for
industrial automation applications.
March 1997
ORDERING NUMBERS: L6370L (MULTIWATT11)
L6 37 0 D ( P o we rS O 2 0 )
UNDER
VOLTAGE
CHARGE
PUMP
DRIVER
NON DISSIPATIVE
SHORT CIRCUIT
CURRENT
LIMITATION
OPEN LOAD
DETECTION
OUTSTATUS
DIAGNOSTIC
THERMAL
PROTECTION
OSC
+
-
1.4V
INPUT
IN+
IN-
ON-DELAY
OUTPUT STATUS
3mA
DIAG2
DIAG1
OUT
V
S
D95IN208D
RSC
BLOCK DIAGRAM
MULTIPOWER BCD TECHNOLOGY
PowerSO20
MULTIWA TT11 (in line)
1/10
PIN CONNECTION (Top view)
ABSOLUTE MAXIMUM RATINGS (Pin numbering referred to Multiwatt package)
Symbol
Parameter
Value
Unit
V
S
Supply Voltage (Pin 10) (T
W
< 10ms)
50
V
V
S
V
O
Supply to Output Differential Voltage. See also V
Cl
(Pins 10 - 9)
internally limited
V
V
od
Externally Forced Voltage (Pin7)
-0.3 to 7
V
I
od
Externally Forced Voltage (Pin7)
+1
mA
V
i
Input Voltage (Pins 3/4)
-10 to V
S
+10
V
V
i
Differential Input Voltage (Pins 3 - 4)
43
V
I
i
Input Current (Pins 3/4)
20
mA
I
O
Output Current (Pin 9). See also ISC (Pin 9)
internally limited
A
P
tot
Power Dissipation. See also THERMAL CHARACTERISTICS.
internally limited
W
T
op
Operating Temperature Range (T
amb
)
-25 to +85
C
T
stg
Storage Temperature
-55 to 150
C
E
I
Energy Induct. Load T
J
= 85
C
1
J
THERMAL DATA
Symbol
Description
Multiwatt
PowerSO20
Unit
R
th j-case
Thermal Resistance Junction-case
Max.
1.5
1.5
C/W
R
th j-amb
Thermal Resistance Junction-ambient
Max.
35
C/W
1
2
3
4
5
6
7
9
10
11
8
OUTPUT
SUPPLY VOLTAGE
OUTPUT
RSC
ON-DELAY
GND
OUTPUT STATUS
INPUT -
INPUT +
DIAGNOSTIC 2
DIAGNOSTIC 1
D95IN209A
GND
OUTPUT
OUTPUT
N.C.
SUPPLY VOLTAGE
N.C.
SUPPLY VOLTAGE
OUTPUT
OUTPUT
N.C.
RSC
DIAGNOSTIC 1
ON-DELAY
DIAGNOSTIC 2
INPUT +
INPUT -
OUTPUT STATUS
GND
1
3
2
4
5
6
7
8
9
18
17
16
15
14
12
13
11
19
10
20
GND
GND
D95IN210B
Note: Output pins must be must be connected externally to the package to use all leads for the output current (Pin 9 and 11 for Multiwatt
package, Pin 2, 3, 8 and 9 for PowerSO20 package).
L6370
2/10
ELECTRICAL CHARACTERISTICS (V
S
= 24V; T
J
= 25 to +125
C, unless otherwise specified)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V
smin
Supply Voltage for Valid
Diagnostics
I
diag
> 0.5mA ; V
dg1
= 1.5V
4
35
V
V
s
Supply Voltage (operative)
9.5
24
35
V
I
q
Quiescent Current
I
ou t
= I
os
= 0
V
il
V
ih
0.8
3
1.4
5
mA
mA
V
sth1
Undervoltage Threshold 1
(See fig. 1), Tamb = 0 to +85
C
8.5
9
9.5
V
V
sth2
Undervoltage Threshold 2
8
8.5
9
V
V
shys
Supply Voltage Hysteresis
300
500
700
mV
I
sc
Short Circuit Current
V
S
= 9.5 to 35V; R
L
= 2
5k
< R
SC
< 30k
15/R
SC
(k
)
A
0
< R
SC
< 5k
2.6
3.2
4
A
V
don
Output Voltage Drop
I
out
= 2.0A T
j
= 25
C
T
j
= 125
C
I
out
= 2.5A T
j
= 25
C
T
j
= 125
C
200
320
250
400
280
440
350
550
mV
mV
mV
mV
I
oslk
Output Leakage Current
V
i
= V
il
; V
o
= 0V
500
A
V
ol
Low State Out Voltage
V
i
= V
il
; R
L
=
0.8
1.5
V
V
cl
Internal Voltage Clamp (V
S
- V
O
)
I
O
= 1A
Single Pulsed: Tp = 300
s
48
53
58
V
I
old
Open Load Detection Current
V
i
= V
ih
; T
amb
= 0 to +85
C
1
3
6
mA
V
id
Common Mode Input Voltage
Range (Operative)
V
S
= 18 to 35V
7
15
V
I
ib
Input Bias Current
V
i
= 7 to 15V; In = 0V
250
250
A
V
ith
Input Threshold Voltage
V+In > VIn
0.8
1.4
2
V
V
iths
Input Threshold Hysteresis
Voltage
V+In > VIn
50
400
mV
R
id
Diff. Input Resistance
0 < +In < +16V ; In = 0V
7 < +In < 0V ; In = 0V
400
150
K
K
I
ilk
Input Offset Current
V+In = VIn
+Ii
0V < V
i
<5.5V
Ii
20
75
25
+20
A
A
In = GND
+Ii
0V < V+In <5.5V
Ii
250
+10
125
+50
A
A
+In = GND
+Ii
0V < VIn <5.5V
Ii
100
50
30
15
A
A
N.
Name
Function
1
DIAG1
DIAGNOSTIC 1 output. This open drain reports the IC working conditions. (See
Diagnostic truth table)
2
DIAG1
DIAGNOSTIC 2 output. This open drain reports the IC working conditions. (See
Diagnostic truth table)
3
IN -
Comparator non inverting input
4
IN+
Comparator inverting input
5
OUTSTATUS
This current source output is capable of driving a LED to signal the status of the output
pin. The pin is active (source current) when the output pin is considered high (See fig 1)
6
GND
Ground
7
ON-DELAY
Programmable ON time interval duration during short circuit operation
8
RSC
Current limitation setting.
9
OUTPUT
High Side output with built-in current limitation
10
V
S
Supply Volatge Input, the value of the supply voltage is monitored to detect under voltage
condition
11
OUTPUT
High Side output with built-in current limitation
PIN FUNCTION (pin numbering referred to Multiwatt package)
L6370
3/10
ELECTRICAL CHARACTERISTICS (continued)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V
oth1
Output Status Threshold 1
Voltage
(See fig. 1)
4.5
5
5.5
V
V
oth2
Output Status Threshold 2
Voltage
(See fig. 1)
4
4.5
5.0
V
V
ohys
Output Status Threshold
Hysteresis
(See fig. 1)
300
500
700
mV
I
osd
Output Status Source Current
V
out
> V
oth1
; V
os
= 2.5V
2
4
mA
V
osd
Active Output Status Driver
Drop Voltage
Vs V
os
; I
os
= 2mA
T
amb
= 0 to +85
C
1.5
3
V
I
oslk
Output Status Driver Leakage
Current
V
out
< V
oth2
; V
os
= 0V
V
S
= 9.5 to 35V
25
A
V
dgl
Diagnostic Drop Voltage
D1 / D2 = L ; I
diag
= 0.5mA
D1 / D2 = L ; I
diag
= 3mA
40
250
mV
mV
I
dglk
Diagnostic Leakage Current
D1 / D2 =H ; 0 < Vdg < V
s
V
S
= 9.5 to 35V
5
A
SOURCE DRAIN NDMOS DIODE
V
fsd
Forward On Voltage
@ I
fsd
= 2.5A
1
1.5
V
I
fp
Forward Peak Current
t = 10ms; d = 20%
6
A
t
rr
Reverse Recovery Time
I
f
= 2.5A di/dt = 25A/
s
200
ns
t
fr
Forward Recovery Time
100
ns
THERMAL CHARACTERISTICS
Lim
Junction Temp. Protect.
135
150
C
T
H
Thermal Hysteresis
20
C
Note V
il
< 0.8V, V
ih
> 2V @ (V+In > VIn)
AC OPERATION (pin numbering referred to Multiwatt package)
Symbol
Pin
Parameter
Test Condition
Min.
Typ.
Max.
Unit
t
r
- t
f
9 vs 4
Rise or Fall Time
V
S
= 24V; R
I
= 70
; R
l
to
ground
20
s
t
d
9 vs 3
Delay Time
5
s
dV/dt
9, 11
Slew Rate (Rise and Fall Edge)
0.7
1
1.5
V/
s
t
ON
7
On time during Short Circuit
Condition
50pF <C
DON
< 2nF
1.28
s/pF
t
OFF
Of time during hort Circuit
Condition
64
t
ON
f
max
Maximum Operating
Frequency
25
KHz
V
OUT
D95IN211A
Voth1
Vshys
Voth2
Figure 1: Output Status Hysteresis
L6370
4/10
50%
50%
td
td
t
90%
90%
10%
10%
tf
tr
t
Vin
Vout
D94IN127A
50%
50%
Figure 3: Switching Waveforms
DIAGNOSTIC TRUTH TABLE
Diagnostic Conditions
Input
Output
Diag1
Diag2
Normal Operation
L
H
L
H
H
H
H
H
Open Load Condition (I
o
< I
old
)
L
H
L
H
H
L
H
H
Short to V
S
L
H
H
H
L
L
H
H
Short Circuit to Ground (I
O
= I
SC
) (**)
(pin ON-DELAY grounded)
H
H (*)
L
H
H
H
H
Output DMOS Open
L
H
L
L
H
L
H
H
Overtemperature
L
H
L
L
H
H
L
L
Supply Undervoltage (V
S
< V
sth2
)
L
H
L
L
L
L
L
L
(*) According to the intervention of the current limiting block.
(**) A cold lamp filament, or a capacitive load may activate the current limiting circuit of the I PS, when the IPS is initially turned on.
Vs
D95IN212
Voth2
Vshys
Voth1
Figure 2: Undervoltage Comparator Hysteresis
L6370
5/10
INPUT SECTION
The input section is an high impedance differen-
tial stage with high common and differential mode
range. There's built-in offset of +1.4V (typical
value) and an hysteresis of 400mV (maximum
value), to ensure high noise immunity.
DIAGNOSTIC LOGIC
The operating conditions of the device are perma-
nently monitored and the following occurences
are signalled via the DIAG1/DIAG2 open-drain
output pins:
-Short Circuit versus ground.
A current limiting circuit fixes at Isc = 3.2A
(typical value) the maximum current that can
be sourced from the OUTPUT pin (for more
details see short circuit operation section).
- Short Circuit versus Vs.
- Under Voltage(UV)
- Over Temperature (OVT)
- Open Load, if the output current is less than
3mA (typical value).
- Output DMOS Open
according to the diagnostic Truth Table:
SHORT CIRCUIT OPERATION
in order to minimise the power dissipation when
the output is shorted to grounded, an innovative,
non dissipative short cicuit protection (patent
pending) is implemented, avoiding, thus the inter-
vention of the thermal protection in most cases.
Whenever the output is shorted to ground, or,
generally speaking, an over current is sinked by
the load, the output devices is driven in linear
mode, sourcing the Isc current (typically 3.2A) for
a time interval (t
on
) defined by means of the exter-
nal C
ON
capacitor connected between the ON-
DELAY pin and GND. Whether the short circuit
crease within the t
on
interval the DIAG2 output
status is not affected, acting as a Programmable
Diagnostic Delay.
This function allow the device to drive a capaci-
tive load or a filament lamp (that exhibits a very
low resistance during the initial heading phase)
without the intervention of the diagnostic.
If the short circuit lasts for the whole t
ON
interval,
the output DMOS is switched OFF and the DIAG2
goes low, for a time interval t
OFF
lasting 64 times
t
ON
.
At the end of the t
OFF
interval if the short circuit
condition is still present, the output DMOS is
turned ON (and the DIAG2 goes high - see fig4)
for another t
ON
interval and the sequence starts
again, or, whether not, the normal condition op-
eration is resumed.
The t
ON
interval can be set to lasts between 64
s
and 2.56ms for a C
ON
capacitor value ranging be-
tween 50pF and 2nF to have:
t
ON
(
s) = 1.28 C
ON
(pF)
If the ON-DELAY pin is grounded the non dissipa-
tive short circuit protection is disabled, and the Isc
current is delivered until the Overtemperature
Protection shuts the device off. The behaviour of
the DIAG2 output is, in this situation, showed in
the Diagnostic Truth Table.
OVERTEMPERATURE PROTECTION (OVT)
If the chip temperature exceeds
lim
(measured in
a central position in the chip) the chip deactivates
itself.
The following actions are taken:
all the output stage is switched off;
the signal DIAG2 is activated (active low).
Normal operation is resumed as soon as (typically
after some seconds) the chip temperature moni-
tored goes back below
lim
-
H
.
The different thresholds with hysteretic behavior
assure that no intermittent conditions can be gen-
erated.
UNDERVOLTAGE PROTECTION (UV)
The supply voltage is expected to range from
9.5V to 35V, even if its reference value is consid-
ered to be 24V.
In this range the device operates correctly.
Below 9.5V the overall system has to be consid-
ered not reliable.
Protection will thus shut off the output whenever
the supply voltage falls below the mask fixed by
the V
sth1
(9V typ.) and V
sth2
(8.5V typ.).
The hysteresis (see fig. 2) ensures a non intermit-
tent behavior at low supply voltage with a super-
imposed ripple.
The Under Voltage status is signalled via the
DIAG1 and DIAG2 outputs (see the Diagnostic
Truth Table) .
DEMAGNETIZATION OF INDUCTIVE LOADS
An internal zener diode, limiting the voltage
across the Power MOS to between 50 and 60V
(V
cl
), provides safe and fast demagnetization of
inductive loads without external clamping devices.
The maximum energy that can be absorbed from
an inductive load is specified as 1J (at Tj = 85
C)
(see figure 2)
L6370
6/10
50V
L
+V
S
I
S
V
S
RL
I
O
OUTPUT
D95IN215A
Figure 5: Inductive Load Equivalent Circuit
OUTPUT
CURRENT
t
ON
t
ON
t
OFF
t
OFF
Time
t<t
ON
DIAG2
(active low)
Time
Short Circuit
Short Circuit
Isc
Iout
D95IN213
Figure 4: L6370 Short Circuit OperationWaveforms
L6370
7/10
MULTIWATT11 (in line) PACKAGE MECHANICAL DATA
DIM.
mm
inch
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
A
5
0.197
B
2.65
0.104
C
1.6
0.063
E
0.49
0.55
0.019
0.022
F
0.88
0.95
0.035
0.037
G
1.57
1.7
1.83
0.062
0.067
0.072
G1
16.87
17
17.13
0.664
0.669
0.674
H1
19.6
0.772
H2
20.2
0.795
L
26.4
26.9
1.039
1.059
L1
22.35
22.85
0.880
0.900
L3
17.25
17.5
17.75
0.679
0.689
0.699
L4
10.3
10.7
10.9
0.406
0.421
0.429
L7
2.65
2.9
0.104
0.114
S
1.9
2.6
0.075
0.102
S1
1.9
2.6
0.075
0.102
Dia1
3.65
3.85
0.144
0.152
L6370
8/10
PowerSO20 PACKAGE MECHANICAL DATA
DIM.
mm
inch
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
A
3.60
0.1417
a1
0.10
0.30
0.0039
0.0118
a2
3.30
0.1299
a3
0
0.10
0
0.0039
b
0.40
0.53
0.0157
0.0209
c
0.23
0.32
0.009
0.0126
D (1)
15.80
16.00
0.6220
0.6299
E
13.90
14.50
0.5472
0.570
e
1.27
0.050
e3
11.43
0.450
E1 (1)
10.90
11.10
0.4291
0.437
E2
2.90
0.1141
G
0
0.10
0
0.0039
h
1.10
L
0.80
1.10
0.0314
0.0433
N
10
(max.)
S
8
(max.)
T
10.0
0.3937
(1) "D and E1" do not include mold flash or protrusions
- Mold flash or protrusions shall not exceed 0.15mm (0.006")
e
a2
A
E
a1
PSO20MEC
DETAIL A
T
D
1
10
11
20
E1
E2
h x 45
DETAILA
lead
slug
a3
S
Gage Plane
0.35
L
DETAIL B
R
DETAIL B
(COPLANARITY)
G
C
- C -
SEATING PLANE
e3
b
c
N
N
L6370
9/10
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. Specifications men-
tioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without ex-
press written approval of SGS-THOMSON Microelectronics.
1997 SGS-THOMSON Microelectronics Printed in Italy All Rights Reserved
MULTIWATT
is a Registered Trademark of SGS-THOMSON Microelectronics
PowerSO20
TM
is a Trademark of SGS-THOMSON Microelectronics
SGS-THOMSON Microelectronics GROUP OF COMPANIES
Australia - Brazil - Canada - China - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands -
Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.
L6370
10/10
PDF 
ZIP