L6370
2.5 A high-side driver industrial intelligent power switch
Features
■
2.5 A output current
■
9.5 V to 35 V supply voltage range
■
Internal current limiting
■
Thermal shutdown
■
Open ground protection
■
Internal negative voltage clamping to VS - 50 V
for fast demagnetization
■
Differential inputs with large common mode
range and threshold hysteresis
■
Undervoltage lockout with hysteresis
■
Open load detection
■
Two diagnostic outputs
■
Output status led driver
■
Non dissipative short circuit protection
■
Protection against and surge transient (IEC
61000-4-5)
■
Immunity against burst transient (IEC 61000-44)
■
ESD protection (human body model ±2kV)
Table 1.
PowerSO-20
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
inductive loads. Diagnostic for CPU feedback and
extensive use of electrical protections make this
device extremely rugged and specially suitable for
industrial automation applications.
Device summary
Part number
Op. temp. range, °C
Package
Packaging
L6370D
-25 to +85
PowerSO-20
Tube
L6370D013TR
-25 to +85
PowerSO-20
Tape and reel
July 2010
Doc ID 4282 Rev 8
1/18
www.st.com
18
Contents
L6370
Contents
1
Block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1
2
3
4
5
2/18
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.3
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.4
AC operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Circuit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1
Diagnostic truth table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2
Input section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.3
Diagnostic logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.4
Short circuit operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.5
Overtemperature protection (OVT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.6
Undervoltage protection (UV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.7
Demagnetization of inductive loads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1
PowerSO-20 mechanical data and package dimensions . . . . . . . . . . . . . 13
4.2
PowerSO-20 packing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Doc ID 4282 Rev 8
L6370
1
Block diagram and pin description
Block diagram and pin description
Figure 1.
Block diagram
VS
UNDER
VOLTAGE
IN+
INPUT
IN-
CHARGE
PUMP
+
DRIVER
1.4V
OUT
NON DISSIPATIVE
SHORT CIRCUIT
ON-DELAY
CURRENT
LIMITATION
RSC
OPEN LOAD
DETECTION
OSC
OUTSTATUS
DIAG1
DIAGNOSTIC
THERMAL
PROTECTION
DIAG2
3mA
OUTPUT STATUS
Figure 2.
D95IN208D
Pin connection (top view)
GND
1
20
GND
OUTPUT
2
19
OUTPUT STATUS
OUTPUT
3
18
INPUT -
ON-DELAY
4
17
INPUT +
SUPPLY VOLTAGE
5
16
N.C.
SUPPLY VOLTAGE
6
15
DIAGNOSTIC 2
DIAGNOSTIC 1
N.C.
7
14
OUTPUT
8
13
RSC
OUTPUT
9
12
N.C.
10
11
GND
PowerSO-20
GND
D95IN210B
Note: Output pins must be connected externally to the package to use all leads for the output
current (Pin 2, 3, 8 and 9 for PowerSO20 package).
Doc ID 4282 Rev 8
3/18
Block diagram and pin description
1.1
Pin description
Table 2.
4/18
L6370
Pin description
Pin N°
Pin name
14
DIAG1
DIAGNOSTIC 1 output. This open drain reports the IC working
conditions. (See diagnostic truth Table 7)
15
DIAG2
DIAGNOSTIC 2 output. This open drain reports the IC working
conditions. (See diagnostic truth Table 7)
18
IN-
Comparator non inverting input
17
IN+
Comparator inverting input
19
OUTSTATUS
1, 10,
11, 20
GND
4
ON-DELAY
13
RSC
8, 9
OUTPUT
5, 6
VS
Function
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 Figure 3)
Ground
Programmable ON time interval duration during short circuit operation
Current limitation setting.
High side output with built-in current limitation
Supply Voltage Input, the value of the supply voltage is monitored to
detect under voltage condition
Doc ID 4282 Rev 8
L6370
Electrical specifications
2
Electrical specifications
2.1
Absolute maximum ratings
Table 3.
Absolute maximum ratings
Symbol
VS
VS– VO
Value
Unit
50
V
internally limited
V
Supply voltage (TW< 10ms)
Supply to output differential voltage.
See also VCl
Vod
Externally forced voltage
-0.3 to 7
V
Iod
Externally forced current
±1
mA
Vi
Input voltage
-10 to VS+10
V
Vi
Differential input voltage
43
V
Ii
Input current
20
mA
IO
Output current. see also ISC
internally limited
A
PTOT
Power dissipation.
see also thermal characteristics.
internally limited
W
TOP
Operating temperature range (Tamb)
-25 to +85
°C
TSTG
Storage temperature
-55 to 150
°C
1
J
EI
2.2
Parameter
Energy induct. load TJ= 85°C
Thermal data
Table 4.
Symbol
Thermal data
Description
Value
RthJC
Thermal resistance junction to case
Max.
1.5
RthJA
Thermal resistance junction to ambient
Max.
-
Unit
°C/W
Doc ID 4282 Rev 8
5/18
Electrical specifications
2.3
L6370
Electrical characteristics
(VS = 24V; TJ = –25 to +125°C, unless otherwise specified)
Table 5.
Symbol
Vsmin
Electrical characteristics
Parameter
Supply voltage for valid
diagnostics
Test condition
Min.
Idiag> 0.5mA; Vdg1= 1.5V
Typ.
Max.
Unit
35
V
24
35
V
0.8
3
1.4
4
mA
8.5
9
9.5
V
4
Vs
Supply voltage (operative)
Iq
Quiescent current
Iout = Ios = 0
Vil
Vih
Vsth1
Undervoltage threshold 1
(See Figure 4), Tamb = 0 to
+85°C
Vsth2
Undervoltage threshold 2
8
8.5
9
V
Vsth3
Supply voltage hysteresis
300
500
700
mV
Isc
Short circuit current
9.5
VS = 9.5 to 35V; RL= 2Ω 5kΩ<
RSC< 30kΩ
0< RSC< 5kΩ
Vdon
Output voltage drop
15/RSC(kΩ)
2.6
A
3.2
4
A
Iout = 2.0A, Tj = 25°C
Tj = 125°C
200
320
280
440
mV
Iout = 2.5A, Tj = 25°C
Tj = 125°C
250
400
350
550
mV
500
μA
0.8
1.5
V
Ioslk
Output leakage current
Vi = Vil; Vo = 0V
Vol
Low state out voltage
Vi = Vil; RL = ∞
Vcl
Internal voltage clamp
(VS- VO)
IO = 1A
Single pulsed: Tp = 300 μs
48
53
58
V
Iold
Open load detection current
Vi = Vih; Tamb = 0 to +85 °C
1
3
6
mA
Vid
Common mode input voltage
range (operative)
VS = 18 to 35V
-7
15
V
Iib
Input bias current
Vi = -7 to 15V; -In = 0V
-250
250
μA
Vith
Input threshold voltage
V +In > V -In
0.8
2
V
Viths
Input threshold hysteresis
voltage
V +In > V -In
50
400
mV
Rid
Diff. input resistance
0 < +In < +16V; -In = 0V
-7 < +In < 0V; -In = 0V
Iilk
6/18
Input offset current
1.4
400
150
V +In = V -In
0V < Vi < 5.5V
+Ii
-Ii
-20
-75
-25
-In = GND
0V < V+In V-In)
2.4
AC operation
Table 6.
AC operation
Symbol
tr - tf
td
Parameter
Rise or fall time
Test condition
Min.
VS = 24V; RI = 70Ω; Rl to ground
Delay time
dV/dt
Slew rate (rise and fall edge)
tON
On time during short circuit
condition
tOFF
fmax
0.7
Typ.
Max.
Unit
20
μs
5
μs
1
1.5
V/μs
1.28
μs/pF
Of time during short circuit
condition
64
tON
Maximum operating frequency
25
KHz
50pF < CDON < 2nF
Doc ID 4282 Rev 8
7/18
Circuit description
3
L6370
Circuit description
Figure 3.
Output status hysteresis
Vohys
Voth1
Voth2
Figure 4.
D95IN211A
VOUT
Undervoltage comparator hysteresis
Vsth3
Vsth1
Vsth2
Figure 5.
D95IN212
Vs
Switching waveforms
Vin
50%
50%
td
t
td
Vout
90%
90%
50%
50%
10%
10%
tr
8/18
Doc ID 4282 Rev 8
tf
D94IN127A
t
L6370
3.1
Circuit description
Diagnostic truth table
Table 7.
Diagnostic truth table
Diagnostic conditions
Input
Output
Diag1
Diag2
Normal operation
L
H
L
H
H
H
H
H
Open load condition (Io< Iold)
L
H
L
H
H
L
H
H
Short to VS
L
H
H
H
L
L
H
H
Short circuit to ground (IO = ISC) (1)
(pin ON-DELAY grounded)
H
L
X
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 (VS< Vsth2)
L
H
L
L
L
L
L
L
1. A cold lamp filament, or a capacitive load may activate the current limiting circuit of the IPS, when the IPS
is initially turned on.
3.2
Input section
The input section is an high impedance differential stage with high common and differential
mode range. There’s built-in offset of +1.4 V (typical value) and an hysteresis of 400 mV
(maximum value), to ensure high noise immunity.
3.3
Diagnostic logic
The operating conditions of the device are permanently monitored and the following
occurrences are signalled via the DIAG1/DIAG2 open-drain output pins:
–
Short circuit versus ground. A current limiting circuit fixes at Isc = 3.2 A (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 3 mA (typical value).
–
Output DMOS open according to the diagnostic truth Table 7.
Doc ID 4282 Rev 8
9/18
Circuit description
3.4
L6370
Short circuit operation
In order to minimize the power dissipation when the output is shorted to grounded, an
innovative, non dissipative short circuit protection (patent pending) is implemented,
avoiding, thus the intervention of the thermal protection in most cases.
Whenever the output is shorted to ground, or, generally speaking, an overcurrent is sink by
the load, the output devices is driven in linear mode, sourcing the Isc current (typically 3.2 A)
for a time interval (ton) defined by means of the external CON capacitor connected between
the ONDELAY pin and GND. Whether the short circuit crease within the ton interval the
DIAG2 output status is not affected, acting as a programmable diagnostic delay.
This function allow the device to drive a capacitive 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 tON interval, the output DMOS is switched
OFF and the DIAG2 goes low, for a time interval tOFF lasting 64 times tON.
At the end of the tOFF interval if the short circuit condition is still present, the output DMOS is
turned ON (and the DIAG2 goes high - see Figure 7) for another tON interval and the
sequence starts again, or, whether not, the normal condition operation is resumed.
The tON interval can be set to lasts between 64 ms and 2.56 ms for a CON capacitor value
ranging between 50 pF and 2 nF to have:
tON (μs) = 1.28 CON (pF)
If the ON-DELAY pin is grounded the non dissipative 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 7.
3.5
Overtemperature protection (OVT)
If the chip temperature exceeds Qlim (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 monitored goes back below Θlim-ΘH.
The different thresholds with hysteretic behavior assure that no intermittent conditions can
be generated.
3.6
Undervoltage protection (UV)
The supply voltage is expected to range from 9.5 V to 35 V, even if its reference value is
considered to be 24 V.
In this range the device operates correctly. Below 9.5 V the overall system has to be
considered not reliable.
Protection will thus shut off the output whenever the supply voltage falls below the mask
fixed by the Vsth1(9 V typ.) and Vsth2 (8.5 V typ.).
10/18
Doc ID 4282 Rev 8
L6370
Circuit description
The hysteresis (see Figure 4) ensures a non intermittent behavior at low supply voltage with
a superimposed ripple. The under voltage status is signalled via the DIAG1 and DIAG2
outputs (see the Diagnostic Truth Table 7).
3.7
Demagnetization of inductive loads
An internal zener diode, limiting the voltage across the Power MOS to between 50 and 60 V
(Vcl), 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 Table 3).
Figure 6.
L6370 short circuit operation waveforms
Figure 7.
Inductive load equivalent circuit
+VS
IS
50V
VS
OUTPUT
IO
L
RL
D95IN215A
Doc ID 4282 Rev 8
11/18
Package mechanical data
4
L6370
Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
12/18
Doc ID 4282 Rev 8
L6370
4.1
Package mechanical data
PowerSO-20 mechanical data and package dimensions
Figure 8.
DIM.
PowerSO-20 mechanical data and package dimensions
mm
MIN.
TYP.
A
a1
inch
MAX.
MIN.
TYP.
3.6
0.1
0.3
a2
0.142
0.004
0.012
3.3
a3
0.130
0
0.1
0.000
0.004
b
0.4
0.53
0.016
0.021
c
0.23
0.32
0.009
0.013
D (1)
15.8
16
0.622
0.630
D1 (2)
9.4
9.8
0.370
0.386
E
13.9
14.5
0.547
e
1.27
e3
E1 (1)
E3
0.570
0.450
11.1
E2
0.429
0.437
0.228
0.244
2.9
5.8
6.2
0.114
G
0
0.1
0.000
0.004
H
15.5
15.9
0.610
0.626
0.8
1.1
0.031
0.043
h
L
1.1
0.043
N
8˚(typ.)
S
8˚(max. )
T
Weight: 1.9gr
0.050
11.43
10.9
OUTLINE AND
MECHANICAL DATA
MAX.
10
JEDEC MO-166
0.394
PowerSO-20
(1) “D and E1” do not include mold flash or protusions.
- Mold flash or protusions shall not exceed 0.15mm (0.006”)
- Critical dimensions: “E”, “G” and “a3”.
(2) For subcontractors, the limit is the one quoted in jedec MO-166
N
R
N
a2
b
A
e
DETAIL A
c
a1
DETAIL B
E
e3
H
DETAIL A
lead
D
slug
a3
DETAIL B
20
11
0.35
Gage Plane
-C-
S
SEATING PLANE
L
G
E2
E1
BOTTOM VIEW
C
(COPLANARITY)
T
E3
1
h x 45˚
1
0
PSO20MEC
D1
0056635 I
Doc ID 4282 Rev 8
13/18
Package mechanical data
4.2
L6370
PowerSO-20 packing information
Figure 9.
PowerSO-20 tube shipment information
TUBE MECHANICAL DATA
A
14/18
mm.
inch
18.80
0.740
B
17.2 ±0.2
0.677 ±0.008
C
8.20 ±0.2
0.323 ±0.008
D
10.90 ±0.2
0.429 ±0.008
E
2.90 ±0.2
0.114 ±0.008
F
0.40
0.016
G
0.80
0.031
H
6.30
0.248
I
4.30 ±0.2
0.165 ±0.008
J
3.7 ±0.2
0.146 ±0.008
K
9.4
0.370
L
0.40
0.016
M
0.80
0.031
N
3.50 ±0.2
0.138 ±0.008
BASE QUANTITY
31 pcs.
BULK QUANTITY
310 pcs.
Doc ID 4282 Rev 8
L6370
Package mechanical data
Figure 10. PowerSO-20 tape shipment specification
TAPE MECHANICAL DATA
D
mm.
inch
1.50 +0.1/0
0.059 +0.004/0
E
1.75 ±0.1
0.069 ±0.004
Po
4.00 ±0.1
0.157 ±0.004
T max.
0.40
0.016
D1 min.
1.50
0.059
0.453 ±0.002
F
11.5 ±0.05
K max.
6.50
0.256
P2
2.00 ±0.1
0.079 ±0.004
R
50
1.968
W
24.00 ±0.30
0.945 ±0.012
P1
24.00
0.945
Ao, Bo, Ko
0.05 min to 1.0 max.
0.002 min to 0.039 max.
BASE QUANTITY
600 pcs.
BULK QUANTITY
600 pcs.
Doc ID 4282 Rev 8
15/18
Package mechanical data
L6370
Figure 11. PowerSO-20 reel shipment specification
T
40mm (1.575in) min.
access hole
at slot location
B
C
D
A
N
G measured
at hub
Full radius
Tape slot in core for tape start
2.5mm (0.098in) min. width
REEL MECHANICAL DATA
mm.
inch
Tape size
24.0 ±0.30
0.945 ±0.012
A max.
330.0
12.992
B min.
1.5
0.059
C
13.0 ±0.20
0.512 ±0.008
D min.
20.2
0.795
N min.
60
2.362
G
24.4 +2/-0
0.960 +0.079/-0
T max.
30.4
1.197
Figure 12. Footprint recommended data
FOOTPRINT DATA
16/18
mm.
inch
A
9.5
0.374
B
14.7-15.0
0.579-0.591
C
12.5-12.7
0.492-0.500
D
6.3
0.248
E
0.64
0.026
F
0.71
0.028
G
1.27
0.050
Doc ID 4282 Rev 8
L6370
5
Revision history
Revision history
Table 8.
Revision history
Date
Revision
Changes
10-Aug-2003
3
Initial release.
12-Dec-2005
4
Applied new Look & Feel Style Sheet.
Added L6370D013TR part number.
Updated Package and Packing section.
26-Apr-2006
5
Document has been reformatted
19-Feb-2007
6
Typo in Figure 2 on page 3.
19-Jun-2007
7
Truth table updated, deleted Multiwatt mechanical information
20-Jul-2010
8
Updated Table 3 on page 5 and Table 5 on page 6
Doc ID 4282 Rev 8
17/18
L6370
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Doc ID 4282 Rev 8
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