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 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 61000-4-
4)
■ ESD protection (human body model ±2kV)
- 50 V
S
L6370
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.
Table 1. Device summary
Part number Op. temp. range, °CPackage 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 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.4 AC operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 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
4 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1 PowerSO-20 mechanical data and package dimensions . . . . . . . . . . . . . 13
4.2 PowerSO-20 packing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2/18 Doc ID 4282 Rev 8
L6370 Block diagram and pin description
1 Block diagram and pin description
Figure 1. Block diagram
V
S
IN+
IN-
INPUT
UNDER
VOLTAGE
+
-
CHARGE
PUMP
DRIVER
1.4V
ON-DELAY
OSC
NON DISSIPATIVE
SHORT CIRCUIT
CURRENT
LIMITATION
OPEN LOAD
DETECTION
OUTSTATUS
THERMAL
PROTECTION
DIAGNOSTIC
3mA
OUTPUT STATUS
D95IN208D
Figure 2. Pin connection (top view)
GND
OUTPUT
OUTPUT
ON-DELAY
SUPPLY VOLTAGE
N.C.
OUTPUT
OUTPUT N.C.
GND GND
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).
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
GND1
OUTPUT STATUS
INPUT -
INPUT +
N.C.SUPPLY VOLTAGE
DIAGNOSTIC 2
DIAGNOSTIC 1
RSC
D95IN210B
OUT
RSC
DIAG1
DIAG2
PowerSO-20
Doc ID 4282 Rev 8 3/18
Block diagram and pin description L6370
1.1 Pin description
Table 2. Pin description
Pin N° Pin name Function
14 DIAG1
15 DIAG2
18 IN- Comparator non inverting input
17 IN+ Comparator inverting input
19 OUTSTATUS
1, 10,
11, 20
4 ON-DELAY Programmable ON time interval duration during short circuit operation
13 RSC Current limitation setting.
8, 9 OUTPUT High side output with built-in current limitation
5, 6 V
GND Ground
S
DIAGNOSTIC 1 output. This open drain reports the IC working
conditions. (See diagnostic truth Ta bl e 7 )
DIAGNOSTIC 2 output. This open drain reports the IC working
conditions. (See diagnostic truth Ta bl e 7 )
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)
Supply Voltage Input, the value of the supply voltage is monitored to
detect under voltage condition
4/18 Doc ID 4282 Rev 8
L6370 Electrical specifications
2 Electrical specifications
2.1 Absolute maximum ratings
Table 3. Absolute maximum ratings
Symbol Parameter Value Unit
V
Supply voltage (TW< 10ms) 50 V
S
VS– VO
V
I
od
V
V
I
I
P
TOT
T
OP
T
STG
E
Supply to output differential voltage.
See also V
Externally forced voltage -0.3 to 7 V
od
Cl
internally limited V
Externally forced current ±1 mA
Input voltage -10 to VS+10 V
i
Differential input voltage 43 V
i
Input current 20 mA
i
Output current. see also ISC internally limited A
O
Power dissipation.
see also thermal characteristics.
Operating temperature range (T
) -25 to +85 °C
amb
internally limited W
Storage temperature -55 to 150 °C
Energy induct. load TJ= 85°C 1 J
I
2.2 Thermal data
Table 4. Thermal data
Symbol Description Value Unit
R
R
thJC
thJA
Thermal resistance junction to case Max. 1.5
Thermal resistance junction to ambient Max. -
°C/W
Doc ID 4282 Rev 8 5/18
Electrical specifications L6370
2.3 Electrical characteristics
(VS = 24V; TJ = –25 to +125°C, unless otherwise specified)
Table 5. Electrical characteristics
Symbol Parameter Test condition Min. Typ. Max. Unit
V
V
V
V
V
I
smin
V
I
q
sth1
sth2
sth3
I
sc
don
oslk
V
ol
V
cl
Supply voltage for valid
diagnostics
Supply voltage (operative) 9.5 24 35 V
s
Quiescent current
I
= Ios = 0
out
Undervoltage threshold 1
> 0.5mA; V
I
diag
V
il
V
ih
(See Figure 4), T
+85°C
= 1.5V 4 35 V
dg1
0.8
3
= 0 to
amb
8.599.5V
Undervoltage threshold 2 8 8.5 9 V
Supply voltage hysteresis 300 500 700 mV
Short circuit current
VS = 9.5 to 35V; RL= 2Ω 5kΩ<
RSC< 30kΩ
0< R
< 5kΩ 2.6 3.2 4 A
SC
= 2.0A, Tj = 25°C
I
out
Tj = 125°C
15/R
(kΩ)A
SC
200
320
Output voltage drop
= 2.5A, Tj = 25°C
I
out
T
j
= 125°C
250
400
Output leakage current Vi = Vil; Vo = 0V 500 μA
Low state out voltage Vi = Vil; RL = ∞ 0.8 1.5 V
Internal voltage clamp
(VS- VO)
IO = 1A
Single pulsed: Tp = 300 μs
48 53 58 V
1.4
4
280
440
350
550
mA
mV
mV
I
V
I
V
V
R
Open load detection current Vi = Vih; T
old
Common mode input voltage
id
range (operative)
Input bias current Vi = -7 to 15V; -In = 0V -250 250 μA
ib
Input threshold voltage V +In > V -In 0.8 1.4 2 V
ith
Input threshold hysteresis
iths
voltage
Diff. input resistance
id
= 18 to 35V -7 15 V
V
S
V +In > V -In 50 400 mV
0 < +In < +16V; -In = 0V
-7 < +In < 0V; -In = 0V
= 0 to +85 °C 1 3 6 mA
amb
V +In = V -In +Ii
0V < Vi < 5.5V -Ii
I
Input offset current
ilk
-In = GND +Ii
0V < V+In <5.5V -Ii -250
+In = GND +Ii
0V < V-In <5.5V -Ii
6/18 Doc ID 4282 Rev 8
400
150
-20
-75 -25
+10
-125
-100
-50
-30
-15
+20
+50
KΩ
μA
L6370 Electrical specifications
Table 5. Electrical characteristics (continued)
Symbol Parameter Test condition Min. Typ. Max. Unit
Output status threshold 1
voltage
Output status threshold 2
voltage
Output status threshold
hysteresis
Output status source current V
Active output status driver drop
osd
voltage
Output status driver leakage
current
Diagnostic drop voltage
dgl
Diagnostic leakage current
V
V
V
I
V
I
V
I
oth1
oth2
ohys
osd
oslk
dglk
Source drain NDMOS diode
V
I
Forward on voltage @ I
fsd
Forward peak current t = 10ms; d = 20% 6 A
fp
Reverse recovery time If = 2.5A di/dt = 25A/μs 200 ns
t
rr
t
Forward recovery time 100 ns
fr
4.555.5V
(See Figure 3)
44.55.0V
300 500 700 mV
> V
out
Vs - Vos; Ios = 2mA
T
amb
V
out
; Vos = 2.5V 2 4 mA
oth1
= 0 to +85°C
< V
; Vos = 0V
oth2
1.5 3 V
VS = 9.5 to 35V
D1 / D2 = L; Idiag= 0.5mA
D1 / D2 = L; Idiag= 3mA
D1 / D2 = H; 0 < Vdg < V
s
40
250
VS = 9.5 to 35V
= 2.5A 1 1.5 V
fsd
25 μA
mV
5 μA
Thermal characteristics
ΘLim Junction temp. protect. 135 150 °C
ΘTH Thermal hysteresis 20 °C
Note: Vil ≤ 0.8V, Vih ≥ 2V @ (V+In > V-In)
2.4 AC operation
Table 6. AC operation
Symbol Parameter Test condition Min. Typ. Max. Unit
- tf Rise or fall time VS = 24V; RI = 70Ω; Rl to ground 20 μs
t
r
Delay time 5 μs
t
d
dV/dt
tON
t
OFF
f
max
Slew rate (rise and fall edge)
On time during short circuit
condition
Of time during short circuit
condition
Maximum operating frequency 25 KHz
50pF < C
< 2nF 1.28 μs/pF
DON
0.7 1 1.5 V/μs
64 t
ON
Doc ID 4282 Rev 8 7/18
Circuit description L6370
3 Circuit description
Figure 3. Output status hysteresis
V
ohys
V
oth2
V
Figure 4. Undervoltage comparator hysteresis
V
sth3
V
sth2
Figure 5. Switching waveforms
V
in
50% 50%
oth1
V
sth1
D95IN211A
D95IN212
V
OUT
V
s
t
d
V
out
90% 90%
50% 50%
10%
t
r
8/18 Doc ID 4282 Rev 8
t
d
10%
t
f
D94IN127A
t
t
L6370 Circuit description
3.1 Diagnostic truth table
Table 7. Diagnostic truth table
Diagnostic conditions Input Output Diag1 Diag2
Normal operation
Open load condition (I
Short to V
Short circuit to ground (I
(pin ON-DELAY grounded)
Output DMOS open
Overtemperature
Supply undervoltage (V
1. A cold lamp filament, or a capacitive load may activate the current limiting circuit of the IPS, when the IPS
S
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.
< I
o
old
= ISC)
O
< V
S
)
sth2
L
H
L
H
L
H
(1)
)
H
L
L
H
L
H
L
H
L
H
L
H
H
H
X
L
L
L
L
L
L
L
H
H
H
L
L
L
H
H
H
L
H
H
L
L
H
H
H
H
H
H
H
H
H
H
L
L
L
L
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 I
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 Ta bl e 7 .
= 3.2 A (typical
sc
Doc ID 4282 Rev 8 9/18
Circuit description L6370
3.4 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 t
OFF and the DIAG2 goes low, for a time interval t
At the end of the t
interval if the short circuit condition is still present, the output DMOS is
OFF
turned ON (and the DIAG2 goes high - see Figure 7) for another t
sequence starts again, or, whether not, the normal condition operation is resumed.
interval, the output DMOS is switched
ON
lasting 64 times tON.
OFF
interval and the
ON
The t
interval can be set to lasts between 64 ms and 2.56 ms for a CON capacitor value
ON
ranging between 50 pF and 2 nF to have:
t
(μs) = 1.28 CON (pF)
ON
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
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 Θ
The different thresholds with hysteretic behavior assure that no intermittent conditions can
be generated.
lim-ΘH
.
Ta bl e 7 .
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 V
10/18 Doc ID 4282 Rev 8
(9 V typ.) and V
sth1
(8.5 V typ.).
sth2
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 Ta bl e 7 ).
3.7 Demagnetization of inductive loads
An internal zener diode, limiting the voltage across the Power MOS to between 50 and 60 V
(V
), provides safe and fast demagnetization of inductive loads without external clamping
cl
devices. The maximum energy that can be absorbed from an inductive load is specified as
1J (at T
Figure 6. L6370 short circuit operation waveforms
= 85°C) (see Ta bl e 3 ).
j
Figure 7. Inductive load equivalent circuit
I
S
50V
V
S
+V
RL
S
OUTPUT
I
O
D95IN215A
L
Doc ID 4282 Rev 8 11/18
Package mechanical data L6370
4 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 Package mechanical data
4.1 PowerSO-20 mechanical data and package dimensions
Figure 8. PowerSO-20 mechanical data and package dimensions
DIM.
mm inch
MIN. TYP. MAX. MIN. TYP. MAX.
A3.60.142
a1 0.1 0.3 0.004 0.012
a2 3.3 0.130
a3 0 0.1 0.000 0.004
b 0.4 0.53 0.016 0.021
Weight: 1.9gr
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 0.570
e 1.27 0.050
e3 11.43 0.450
E1 (1) 10.9 11.1 0.429 0.437
E2 2.9 0.114
E3 5.8 6.2 0.228 0.244
G 0 0.1 0.000 0.004
H 15.5 15.9 0.610 0.626
h1.10.043
L 0.8 1.1 0.031 0.043
N 8˚(typ.)
S 8˚(max. )
T 10 0 .394
(1) “D and E1” do n ot include mold flash or protu sions.
- Mold flash or pr otusions sh all not exceed 0.15mm (0.006”)
- Critical di mensions: “E ”, “G” and “a3 ”.
(2)
For subcontractors, the limit is the one quoted in jedec MO-166
NN
a2
A
b
DETAIL A
e3
H
e
DETAIL B
OUTLINE AND
MECHANICAL DATA
JEDEC MO-166
PowerSO-20
R
a1
E
lead
DETAIL A
c
D
E2
T
110
h x 45˚
Doc ID 4282 Rev 8 13/18
a3
DETAIL B
1120
E1
PSO20MEC
Gage Plane
BOTTOM VIEW
0.35
S
D1
slug
- C -
L
SEATING PLANE
GC
(COPLANARITY)
E3
0056635 I
Package mechanical data L6370
4.2 PowerSO-20 packing information
Figure 9. PowerSO-20 tube shipment information
TUBE MECHANICAL DATA
mm. inch
A 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.
14/18 Doc ID 4282 Rev 8
L6370 Package mechanical data
Figure 10. PowerSO-20 tape shipment specification
TAPE MECHANICAL DATA
mm. inch
D 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
F 11.5 ±0.05 0.453 ±0.002
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
B
A
D
at slot locatio n
C
N
Full radius
Tape slot in core for tape start
2.5mm (0.0 98in) mi n. width
REEL MECHANICAL DATA
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
G measured
at hub
mm. inch
FOOTPRINT DATA
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
16/18 Doc ID 4282 Rev 8
L6370 Revision history
5 Revision history
Table 8. Revision history
Date Revision Changes
10-Aug-2003 3 Initial release.
Applied new Look & Feel Style Sheet.
12-Dec-2005 4
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
Added L6370D013TR part number.
Updated Package and Packing section.
Doc ID 4282 Rev 8 17/18
L6370
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18/18 Doc ID 4282 Rev 8
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