Technical Data Sheet

L6370Q
2.5 A single high-side smart power switch
Datasheet - production data
• Two diagnostic outputs
• Output status LED driver
• Non-dissipative short-circuit protection
• Surge and transient protection (IEC61000-4-5)
• Burst transient immunity (IEC61000-4-4)
• ESD protection (human body model ±2 kV)
VFQFPN48
(7 x 7 mm)
Applications
Features
• Programmable logic controller
• Industrial PC peripheral input/output
Type
Vdemag
RDS(on)
Iout
Vs
L6370Q
Vs - 50 V
0.1 Ω
2.5 A
50 V
• 9.5 V to 35 V supply voltage range
• Numerical control machines
• Drivers for all loads (resistive, capacitive,
inductive load)
• Internal current limit
Description
• Thermal shutdown
The L6370Q is a monolithic intelligent power
switch in BCDmultipower technology to drive
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 especially suitable
for industrial automation applications.
• Open ground protection
• Internal negative voltage clamping for fast
demagnetization (Vs - 50 V)
• Differential inputs with large common mode
range and threshold hysteresis
• Undervoltage lockout with hysteresis
• Open load detection
Table 1. Device summary
Part number
Package
L6370Q
Packaging
Tube
VFQFPN 7x7x1 48L
L6370QTR
January 2014
This is information on a product in full production.
Tape and reel
DocID022313 Rev 2
1/17
www.st.com
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1
Diagnostic truth table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
3.2
Input section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
3.3
Diagnostic logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
3.4
Short-circuit operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.5
Overtemperature protection (OVT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.6
Undervoltage protection (UV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.7
Demagnetization of inductive loads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2/17
DocID022313 Rev 2
L6370Q
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
D95IN208D
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Figure 2. Pin connections (top view)
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DocID022313 Rev 2
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1
Block diagram and pin description
3/17
17
Block diagram and pin description
1.1
L6370Q
Pin description
Table 2. Pin description
4/17
Pin
Name
Description
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 undervoltage conditions
6
VS
Supply voltage input, the value of the supply voltage is monitored to
detect undervoltage conditions
7
VS
Supply voltage input, the value of the supply voltage is monitored to
detect undervoltage conditions
8
VS
Supply voltage input, the value of the supply voltage is monitored to
detect undervoltage conditions
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
Not connected
Programmable on-time interval duration during short-circuit operation
Current limitation settings
DIAGNOSTIC1 output. This open drain reports the IC working
conditions (seeTable 6)
DocID022313 Rev 2
L6370Q
Block diagram and pin description
Table 2. Pin description (continued)
Pin
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
DIAGNOSTIC2 output. This open drain reports the IC working
conditions (seeTable 6)
This current source output drives 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
DocID022313 Rev 2
5/17
17
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<10 ms)
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
Iout
Output current (see also Isc)
Internally limited
A
Ei
Energy inductive load Tj = 85 °C
1
J
Internally limited
W
Operating temperature range
-40 to +105
°C
Storage temperature
-55 to 150
°C
PTOT
Top
TSTG
2.2
Parameter
Power dissipation (see also thermal characteristics)
Thermal data
Table 4. Thermal data
Symbol
Description
Value
Rth(JC)
Thermal resistance junction-case
Max.
4
Rth(JA)
Thermal resistance junction-ambient (1)
Max.
50
°C/W
1. Mounted on a 2-side + vias PCB with a ground dissipating area on the bottom side.
6/17
DocID022313 Rev 2
Unit
L6370Q
2.3
Electrical specifications
Electrical characteristics
(Vs = 24 V; TJ = –25 to +125 °C, unless otherwise specified)
Table 5. Electrical characteristics
Symbol
Vsmin
Parameter
Supply voltage for valid
diagnostics
Test conditions
Min.
Idiag> 0.5 mA; Vdg1= 1.5 V
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
Tamb = 0 to +85 °C (see
Figure 4)
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 35 V; RL= 2 Ω
5 kΩ < RSC< 30 kΩ
15/RSC(kΩ)
0< RSC< 5 kΩ
Vdon
Output voltage drop
2.6
A
3.2
4
A
Iout = 2.0 A, Tj = 25 °C
Tj = 125 °C
200
320
280
440
mV
Iout = 2.5 A, 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 = 0 V
Vol
Low-state out voltage
Vi = Vil; RL = ∞
Vcl
Internal voltage clamp
(Vs- VO)
IO = 1 A
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 35 V
-7
15
V
Iib
Input bias current
Vi = -7 to 15 V; -In = 0 V
-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
Differential input resistance
0 < +In < +16 V; -In = 0 V
-7 < +In < 0 V; -In = 0 V
Iilk
Input offset current
1.4
400
150
V +In = V -In
0 V < Vi < 5.5 V
+Ii
-Ii
-20
-75
-25
-In = GND
0 V < V + In <5.5 V
+Ii
-Ii
-250
+10
-125
+In = GND
0 V < V-In <5.5 V
+Ii
-Ii
-100
-50
-30
-15
DocID022313 Rev 2
kΩ
+20
+50
μA
7/17
17
Electrical specifications
L6370Q
Table 5. Electrical characteristics (continued)
Symbol
Parameter
Voth1
Output status threshold 1
voltage
Voth2
Output status threshold 2
voltage
Vohys
Output status threshold
hysteresis
Test conditions
(See Figure 3)
Iosd
Output status source current
Vout > Voth1; Vos = 2.5 V
Vosd
Active output status driver drop Vs - Vos; Ios = 2 mA
voltage
Tamb = 0 to +85 °C
Ioslk
Output status driver leakage
current
Vout < Voth2; Vos = 0 V
Vs = 9.5 to 35 V
Vdgl
Diagnostic drop voltage
D1 / D2 = L; Idiag= 0.5 mA
D1 / D2 = L; Idiag= 3 mA
Idglk
Diagnostic leakage current
D1 / D2 = H; 0 < Vdg < Vs
Vs = 9.5 to 35 V
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 = 2.5 A
Ifp
Forward peak current
t = 10 ms; d = 20%
trr
Reverse recovery time
If = 2.5 A di/dt = 25 A/μs
tfr
Forward recovery time
1
200
ns
100
ns
150
°C
20
°C
Thermal characteristics
Θlim
Junction temperature protection
Θth
Thermal hysteresis
135
Note:
Vil ≤ 0.8V, Vih ≥ 2V @ (V+In > V-In)
2.4
AC operation
Table 6. AC operation
Symbol
tr - tf
td
dV/dt
tON
8/17
Parameter
Rise or fall time
Test conditions
Min.
Vs = 24 V; RI = 70 Ω; Rl to
ground
Delay time
Slew rate (rise and fall edge)
On-time during short-circuit
condition
0.7
50 pF < CON < 2 nF
DocID022313 Rev 2
Typ.
Max.
Unit
20
μs
5
μs
1
1.28
1.5
V/μs
μs/pF
L6370Q
Electrical specifications
Table 6. AC operation (continued)
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
tOFF
Off-time during short-circuit
condition
64
tON
fmax
Maximum operating frequency
25
kHz
DocID022313 Rev 2
9/17
17
Circuit description
3
L6370Q
Circuit description
Figure 3. Output status hysteresis
Vohys
Voth1
Voth2
D95IN211A
VOUT
Figure 4. Undervoltage comparator hysteresis
Vsth3
Vsth2
Vsth1
D95IN212
Vs
Figure 5. Switching waveforms
Vin
50%
50%
td
t
td
Vout
90%
90%
50%
50%
10%
10%
tr
10/17
DocID022313 Rev 2
tf
D94IN127A
t
L6370Q
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)
(ON-DELAY pin 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 a high impedance differential stage with high common and differential
mode range. Built-in offset of +1.4 V (typical value) and a hysteresis of 400 mV (maximum
value) assure high noise immunity.
3.3
Diagnostic logic
The operating conditions of the device are permanently monitored and the following
occurrences are indicated by DIAG1/DIAG2 open drain output pins:
•
Short-circuit versus ground. A current limit circuit fixes Isc = 3.2 A (typical value) the
maximum current that can be sourced from the OUTPUT pin (for more details see
Section 3.4: Short-circuit operation)
•
Short-circuit versus Vs
•
Undervoltage (UV)
•
Overtemperature (OVT)
•
Open load, if the output current is less than 3 mA (typical value)
•
Output DMOS open according to Table 7
DocID022313 Rev 2
11/17
17
Circuit description
3.4
L6370Q
Short-circuit operation
In order to minimize the power dissipation when the output is shorted-to-ground, an
innovative, non-dissipative short-circuit protection (patent pending) is implemented,
avoiding the thermal protection.
Whenever the output is shorted-to-ground, or, an overcurrent is sinked by the load, the
output devices are driven to linear mode, sourcing the Isc current (3.2 A typ.) for a time
interval (tON) defined by the external CON capacitor connected between the ON-DELAY pin
and GND. If the short-circuit increases within the tON interval the DIAG2 output status is not
affected, acting as a programmable diagnostic delay.
This function allows the device to drive a capacitive load or a filament lamp (that exhibits a
very low resistance during the initial heading phase) without the diagnostic. If the shortcircuit lasts for the whole tON interval, the output DMOS is switched off and the DIAG2 goes
low, for a time interval tOFF lasting tON 64 times.
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, otherwise, the normal condition operation is resumed.
The tON interval can be set to last between 64 ms and 2.56 ms for a CON capacitor value
ranging between 50 pF and 2 nF:
Equation 1
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
behavior of the DIAG2 output is, in this situation, showed in Table 7.
3.5
Overtemperature protection (OVT)
If the chip temperature exceeds Θlim (measured in a central position in the chip) the chip
deactivates itself.
The following actions are taken:
•
the output stage is switched off
•
the signal DIAG2 is activated (active low)
Normal operation is resumed as soon as (after some seconds) the chip temperature
monitored goes back below Θlim-Θth.
The different thresholds with hysteretic behavior assure that any intermittent condition 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 24
V.
In this range, the device operates correctly. Below 9.5 V the overall system is not reliable.
12/17
DocID022313 Rev 2
L6370Q
Circuit description
Protection shuts off the output whenever the supply voltage falls below the mask fixed by
Vsth1(9 V typ.) and Vsth2 (8.5 V typ.).
The hysteresis (see Figure 4) assures a non-intermittent behavior at low supply voltage with
a superimposed ripple. The undervoltage status is indicated by the DIAG1 and DIAG2
outputs (see Table 7).
3.7
Demagnetization of inductive loads
An internal Zener diode, limiting the voltage across the power MOSFET 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 by an inductive load is specified as 1J
(at Tj = 85 °C) (see Table 3).
Figure 6. L6370Q short-circuit operation waveforms
Figure 7. Inductive load equivalent circuit
+VS
IS
50V
VS
OUTPUT
IO
L
RL
D95IN215A
DocID022313 Rev 2
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17
Package mechanical data
4
L6370Q
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.
Figure 8. VFQFPN48 (7 x 7 x 1.0 mm) package mechanical drawings
14/17
DocID022313 Rev 2
L6370Q
Package mechanical data
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
DocID022313 Rev 2
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Revision history
5
L6370Q
Revision history
Table 9. Document revision history
16/17
Date
Revision
Changes
04-Oct-2011
1
Initial release.
24-Jan-2013
2
Changed the operating temperature range parameter in
Table 3.
Minor text changes.
DocID022313 Rev 2
L6370Q
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