July 2010 Doc ID 4282 Rev 8 1/18
18
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 61000-4-
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
inductive loads. Diagnostic for CPU feedback and
extensive use of electrical protections make this
device extremely rugged and specially suitable for
industrial automation applications.
PowerSO-20
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
www.st.com
Contents L6370
2/18 Doc ID 4282 Rev 8
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
L6370 Block diagram and pin description
Doc ID 4282 Rev 8 3/18
1 Block diagram and pin description
Figure 1. Block diagram
Figure 2. Pin connection (top view)
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
VS
D95IN208D
RSC
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
GND1
3
2
4
5
6
7
8
9
18
17
16
15
14
12
13
11
19
10
20
GND GND
D95IN210B
PowerSO-20
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).
Block diagram and pin description L6370
4/18 Doc ID 4282 Rev 8
1.1 Pin description
Table 2. Pin description
Pin N°Pin name Function
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
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)
1, 10,
11, 20 GND Ground
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 VS
Supply Voltage Input, the value of the supply voltage is monitored to
detect under voltage condition
L6370 Electrical specifications
Doc ID 4282 Rev 8 5/18
2 Electrical specifications
2.1 Absolute maximum ratings
2.2 Thermal data
Table 3. Absolute maximum ratings
Symbol Parameter Value Unit
VS Supply voltage (TW< 10ms) 50 V
VS– VO Supply to output differential voltage.
See also VCl internally limited V
Vod Externally forced voltage -0.3 to 7 V
Iod Externally forced current ±1 mA
ViInput voltage -10 to VS+10 V
ViDifferential input voltage 43 V
IiInput current 20 mA
IOOutput 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
EIEnergy induct. load TJ= 85°C 1 J
Table 4. Thermal data
Symbol Description Value Unit
RthJC Thermal resistance junction to case Max. 1.5 °C/W
RthJA Thermal resistance junction to ambient Max. -
Electrical specifications L6370
6/18 Doc ID 4282 Rev 8
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
Vsmin
Supply voltage for valid
diagnostics Idiag> 0.5mA; Vdg1= 1.5V 4 35 V
VsSupply voltage (operative) 9.5 24 35 V
Iq
Quiescent current
Iout = Ios = 0
Vil
Vih
0.8
3
1.4
4mA
Vsth1 Undervoltage threshold 1 (See Figure 4), Tamb = 0 to
+85°C 8.599.5V
Vsth2 Undervoltage threshold 2 8 8.5 9 V
Vsth3 Supply voltage hysteresis 300 500 700 mV
Isc Short circuit current
VS = 9.5 to 35V; RL= 2Ω 5kΩ<
RSC< 30kΩ 15/RSC(kΩ)A
0< RSC< 5kΩ 2.6 3.2 4 A
Vdon Output voltage drop
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
Ioslk Output leakage current Vi = Vil; Vo = 0V 500 μA
Vol Low state out voltage Vi = Vil; RL = ∞0.8 1.5 V
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 -715 V
Iib Input bias current Vi = -7 to 15V; -In = 0V -250 250 μA
Vith Input threshold voltage V +In > V -In 0.8 1.4 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
400
150 KΩ
Iilk Input offset current
V +In = V -In +Ii
0V < Vi < 5.5V -Ii
-20
-75 -25
+20
μA
-In = GND +Ii
0V < V+In <5.5V -Ii -250
+10
-125
+50
+In = GND +Ii
0V < V-In <5.5V -Ii
-100
-50
-30
-15
L6370 Electrical specifications
Doc ID 4282 Rev 8 7/18
Note: Vil
≤
0.8V, Vih
≥
2V @ (V+In > V-In)
2.4 AC operation
Voth1
Output status threshold 1
voltage
(See Figure 3)
4.555.5V
Voth2
Output status threshold 2
voltage 44.55.0V
Vohys
Output status threshold
hysteresis 300 500 700 mV
Iosd Output status source current Vout > Voth1; Vos = 2.5V 2 4 mA
Vosd
Active output status driver drop
voltage
Vs - Vos; Ios = 2mA
Tamb = 0 to +85°C 1.5 3 V
Ioslk
Output status driver leakage
current
Vout < Voth2; Vos = 0V
VS = 9.5 to 35V 25 μA
Vdgl Diagnostic drop voltage D1 / D2 = L; Idiag= 0.5mA
D1 / D2 = L; Idiag= 3mA
40
250 mV
Idglk Diagnostic leakage current D1 / D2 = H; 0 < Vdg < Vs
VS = 9.5 to 35V 5μA
Source drain NDMOS diode
Vfsd Forward on voltage @ Ifsd = 2.5A 1 1.5 V
Ifp Forward peak current t = 10ms; d = 20% 6 A
trr Reverse recovery time If = 2.5A di/dt = 25A/μs 200 ns
tfr Forward recovery time 100 ns
Thermal characteristics
ΘLim Junction temp. protect. 135 150 °C
ΘTH Thermal hysteresis 20 °C
Table 6. AC operation
Symbol Parameter Test condition Min. Typ. Max. Unit
tr - tf Rise or fall time VS = 24V; RI = 70Ω; Rl to ground 20 μs
td Delay time 5 μs
dV/dt
Slew rate (rise and fall edge)
0.7 1 1.5 V/μs
tON On time during short circuit
condition 50pF < CDON < 2nF 1.28 μs/pF
tOFF Of time during short circuit
condition 64 tON
fmax Maximum operating frequency 25 KHz
Table 5. Electrical characteristics (continued)
Symbol Parameter Test condition Min. Typ. Max. Unit
Circuit description L6370
8/18 Doc ID 4282 Rev 8
3 Circuit description
Figure 3. Output status hysteresis
Figure 4. Undervoltage comparator hysteresis
Figure 5. Switching waveforms
VOUT
D95IN211A
Voth1
Vohys
Voth2
Vs
D95IN212
Vsth1
Vsth3
Vsth2
50% 50%
td
tdt
90% 90%
10% 10%
tf
trt
Vin
Vout
D94IN127A
50% 50%
L6370 Circuit description
Doc ID 4282 Rev 8 9/18
3.1 Diagnostic truth table
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 Ta bl e 7 .
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)
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.
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
Circuit description L6370
10/18 Doc ID 4282 Rev 8
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 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 Ta b l e 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.).
L6370 Circuit description
Doc ID 4282 Rev 8 11/18
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 b le 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 Ta b l e 3 ).
Figure 6. L6370 short circuit operation waveforms
Figure 7. Inductive load equivalent circuit
50V
L
+VS
IS
VS
RL
IO
OUTPUT
D95IN215A
Package mechanical data L6370
12/18 Doc ID 4282 Rev 8
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.
L6370 Package mechanical data
Doc ID 4282 Rev 8 13/18
4.1 PowerSO-20 mechanical data and package dimensions
Figure 8. PowerSO-20 mechanical data and package dimensions
OUTLINE AND
MECHANICAL DATA
e
a2 A
E
a1
PSO20MEC
DETAIL A
T
D
110
1120
E1
E2
h x 45˚
DETAIL A
lead
slug
a3
S
Gage Plane
0.35
L
DETAIL B
R
DETAIL B
(COPLANARITY)
GC
- C -
SEATING PLANE
e3
b
c
NN
H
BOTTOM VIEW
E3
D1
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
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 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
PowerSO-20
0056635 I
JEDEC MO-166
Weight: 1.9gr
Package mechanical data L6370
14/18 Doc ID 4282 Rev 8
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.
L6370 Package mechanical data
Doc ID 4282 Rev 8 15/18
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.
Package mechanical data L6370
16/18 Doc ID 4282 Rev 8
Figure 11. PowerSO-20 reel shipment specification
Figure 12. Footprint recommended data
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
AD
B
Full radius
Tape slot in core for tape start
2.5mm (0.098in) min. width
40mm (1.575in) min.
access hole
at slot location
C
N
G measured
at hub
T
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
L6370 Revision history
Doc ID 4282 Rev 8 17/18
5 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
L6370
18/18 Doc ID 4282 Rev 8
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