STMICROELECTRONICS L6370Q

L6370Q
2.5 A single high-side smart power switch
Features
Type
Vdemag
RDSon
Iout
Vs
L6370Q
Vs-50 V
0.1 Ω
2.5 A
50 V
■
2.5 A output current
■
9.5 V to 35 V supply voltage range
■
Internal current limiting
■
Thermal shutdown
Applications
■
Open ground protection
■
Programmable logic control
■
Internal negative voltage clamping to VS - 50 V
for fast demagnetization
■
Industrial PC peripheral input/output
■
Differential inputs with large common mode
range and threshold hysteresis
■
Numerical control machines
■
■
Undervoltage lockout with hysteresis
Drivers for all type of loads (resistive,
capacitive, inductive load)
■
Open load detection
■
Two diagnostic outputs
■
Output status LED driver
■
Non dissipative short circuit protection
■
Protection against and surge transient
(IEC61000-4-5)
■
Immunity against burst transient (IEC61000-44)
■
ESD protection (human body model ±2kV)
Table 1.
QFN-48
(7 x 7 mm)
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
Package
L6370Q
Packaging
Tube
VFQFPN 7x7x1 48L
L6370QTR
October 2011
Tape and reel
Doc ID 022313 Rev 1
1/16
www.st.com
16
Contents
L6370Q
Contents
1
Block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1
2
3
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.4
AC operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Circuit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1
Diagnostic truth table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2
Input section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.3
Diagnostic logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.4
Short circuit operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.5
Overtemperature protection (OVT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.6
Undervoltage protection (UV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.7
Demagnetization of inductive loads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2/16
Doc ID 022313 Rev 1
L6370Q
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)
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Doc ID 022313 Rev 1
3/16
Block diagram and pin description
1.1
Pin description
Table 2.
4/16
L6370Q
Pin description
Pin N°
Name
1
OUTPUT
High side output with built-in current limitation
2
OUTPUT
High side output with built-in current limitation
3
NC
4
ON-DELAY
5
VS
Supply voltage input, the value of the supply voltage is monitored to
detect under voltage condition
6
VS
Supply voltage input, the value of the supply voltage is monitored to
detect under voltage condition
7
VS
Supply voltage input, the value of the supply voltage is monitored to
detect under voltage condition
8
VS
Supply voltage input, the value of the supply voltage is monitored to
detect under voltage condition
9
NC
Not connected
10
OUTPUT
High side output with built-in current limitation
11
OUTPUT
High side output with built-in current limitation
12
NC
Not connected
13
NC
Not connected
14
NC
Not connected
15
NC
Not connected
16
NC
Not connected
17
NC
Not connected
18
NC
Not connected
19
NC
Not connected
20
NC
Not connected
21
NC
Not connected
22
RSC
23
NC
Not connected
24
NC
Not connected
25
NC
Not connected
26
NC
Not connected
27
NC
Not connected
28
DIAG1
Description
Not connected
Programmable ON time interval duration during short circuit operation
Current limitation setting.
DIAGNOSTIC 1 output. This open drain reports the IC working
conditions. (See diagnostic truth Table 6.)
Doc ID 022313 Rev 1
L6370Q
Block diagram and pin description
Table 2.
Pin description (continued)
Pin N°
Name
29
DIAG2
30
NC
Not connected
31
NC
Not connected
32
NC
Not connected
33
IN+
Comparator inverting input
34
IN-
Comparator non inverting input
35
NC
Not connected
36
NC
Not connected
37
NC
Not connected
38
Description
DIAGNOSTIC 2 output. This open drain reports the IC working
conditions. (See diagnostic truth Table 6.)
This current source output is capable of driving a LED to signal the
OUTSTATUS status of the output pin. The pin is active (source current) when the
output pin is considered high
39
NC
Not connected
40
NC
Not connected
41
GND
42
NC
Not connected
43
NC
Not connected
44
NC
Not connected
45
NC
Not connected
46
NC
Not connected
47
NC
Not connected
48
NC
Not connected
Ground
Doc ID 022313 Rev 1
5/16
Electrical specifications
L6370Q
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
Vin
Input voltage
-10 to Vs+10
V
Vi
Differential input voltage
43
V
Iin
Input current
20
mA
Internally limited
A
1
J
Internally limited
W
Iout
Ei
Output current. See also Isc
Energy inductive load Tj=85°C
PTOT
Power dissipation. Se also thermal characteristics
Top
Operating temperature range
-25 to +85
°C
Storage temperature
-55 to 150
°C
TSTG
2.2
Parameter
Thermal data
Table 4.
Symbol
Thermal data
Description
Value
RthJC
Thermal resistance junction to case
Max.
4
RthJA
Thermal resistance junction to ambient (1)
Max.
50
°C/W
1. Mounted on a 2-side + vias PCB with a ground dissipating area on the bottom side.
6/16
Doc ID 022313 Rev 1
Unit
L6370Q
2.3
Electrical specifications
Electrical characteristics
(VS = 24 V; 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
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 <5.5V
+Ii
-Ii
-250
+10
-125
+In = GND
0V < V-In <5.5V
+Ii
-Ii
-100
-50
-30
-15
Doc ID 022313 Rev 1
KΩ
+20
+50
μA
7/16
Electrical specifications
Table 5.
Symbol
L6370Q
Electrical characteristics (continued)
Parameter
Voth1
Output status threshold 1
voltage
Voth2
Output status threshold 2
voltage
Vohys
Output status threshold
hysteresis
Test condition
(See Figure 3)
Iosd
Output status source current
Vosd
Active output status driver drop Vs - Vos; Ios = 2mA
voltage
Tamb = 0 to +85°C
Ioslk
Output status driver leakage
current
Vout < Voth2; Vos = 0V
VS = 9.5 to 35V
Vdgl
Diagnostic drop voltage
D1 / D2 = L; Idiag= 0.5mA
D1 / D2 = L; Idiag= 3mA
Idglk
Diagnostic leakage current
D1 / D2 = H; 0 < Vdg < Vs
VS = 9.5 to 35V
Vout > Voth1; Vos = 2.5V
Min.
Typ.
Max.
Unit
4.5
5
5.5
V
4
4.5
5.0
V
300
500
700
mV
4
mA
3
V
25
μA
2
1.5
40
250
mV
5
μA
1.5
V
6
A
Source drain NDMOS diode
Vfsd
Forward on voltage
@ Ifsd = 2.5A
Ifp
Forward peak current
t = 10ms; d = 20%
trr
Reverse recovery time
If = 2.5A di/dt = 25A/μs
tfr
Forward recovery time
1
200
ns
100
ns
150
°C
20
°C
Thermal characteristics
ΘLim
Junction temp. protect.
ΘTH
Thermal hysteresis
135
Note:
Vil ≤ 0.8V, Vih ≥ 2V @ (V+In > V-In)
2.4
AC operation
Table 6.
AC operation
Symbol
t r - tf
td
Parameter
Rise or fall time
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
8/16
Test condition
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 022313 Rev 1
L6370Q
3
Circuit description
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
Doc ID 022313 Rev 1
tf
D94IN127A
t
9/16
Circuit description
3.1
L6370Q
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:
10/16
●
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 022313 Rev 1
L6370Q
3.4
Circuit description
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 sinked
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.).
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11/16
Circuit description
L6370Q
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
RL
D95IN215A
12/16
Doc ID 022313 Rev 1
L
L6370Q
4
Package mechanical data
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.
Table 8.
VFQFPN48 (7 x 7 x 1.0 mm) package mechanical data
(mm)
Dim.
Min.
Typ.
Max.
0.80
0.90
1.00
A1
0.02
0.05
A2
0.65
1.00
A3
0.25
A
b
0.18
0.23
0.30
D
6.85
7.00
7.15
D2
4.95
5.10
5.25
E
6.85
7.00
7.15
E2
4.95
5.10
5.25
e
0.45
0.50
0.55
L
0.30
0.40
0.50
ddd
0.08
Doc ID 022313 Rev 1
13/16
Package mechanical data
Figure 8.
14/16
L6370Q
VFQFPN48 (7 x 7 x 1.0 mm) package mechanical drawing
Doc ID 022313 Rev 1
L6370Q
5
Revision history
Revision history
Table 9.
Document revision history
Date
Revision
04-Oct-2011
1
Changes
Initial release.
Doc ID 022313 Rev 1
15/16
L6370Q
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