LCP22
Protection IC for ringing SLICs
Datasheet − production data
Description
The LCP22 has been developed to protect SLICs
operating on both negative and positive battery
supplies, as well as high voltage SLICs. It
provides crowbar mode protection for both TIP
and RING lines. The surge suppression is
assumed for each wire by two thyristor structures,
one dedicated to positive surges the second one
for negative surges. Both positive and negative
threshold levels are programmable by two gates.
62ZLGH
Features
• Protection IC recommended for ringing SLICs
• Wide firing voltage range: -120 V to +120 V
• Low gate triggering current: IG = 5 mA max
• Peak pulse current: IPP = 50 A (10/1000 µs)
LCP22 can be used to help equipment to meet
various standards such as UL1950, IEC 60950 /
CSAC22.2, UL1459 and TIA-968-A. LCP22
pinout and clearance is compatible with UL60950.
A Trisil ™ meets UL94 V0.
The LCP22 associated with Epcos PTC model
B59173C1130A151 is compliant with
ITU TK20/K21 (4 kV lightning and AC power fault
tests).
• Holding current: IH = 150 mA min.
Figure 1. Functional diagram
Line (TIP or RING)
Applications
• Dual battery supply voltage SLICs
• Central office (CO)
Gp
Gn
• Private branch exchange (PBX)
GND
• Digital loop carrier (DLC)
• Digital subscriber line access multiplexer
(DSLAM)
• Fiber in the loop (FITL)
Line (RING or TIP)
Figure 2. Pin-out configuration
• Wireless local loop (WLL)
• Hybrid fiber coax (HFC)
• ISDN terminal adapter
• Cable modem
Gn
Line (TIP or RING)
NC
GND
Gp
GND
NC
Line (RING or TIP)
TM: Trisil is a trademark of STMicroelectronics
October 2014
This is information on a product in full production.
Doc ID025775 Rev 3
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www.st.com
Characteristics
1
LCP22
Characteristics
Table 1. Compliant with the following standards
Standard
Peak surge
voltage (V)
Voltage
waveform
Required
peak
current (A)
Current
waveform
Minimum
series resistor
Rs to meet
standard ( Ω )
GR-1089 Core First level
2500
1000
2/10 µs
10/1000 µs
500
100
2/10 µs
10/1000 µs
12
10
GR-1089 Core Second level
5000
2/10 µs
500
2/10 µs
24
GR-1089 Core Intra-building
1500
2/10 µs
100
2/10 µs
0
ITU-T-K20/K21
6000
4000
1500
10/700 µs
150
100
37.5
5/310 µs
35
10
0
ITU-T-K20 (IEC61000-4-2)
8000
15000
1/60 ns
ESD contact discharge
ESD air discharge
0
0
IEC61000-4-5
4000
4000
10/700 µs
1.2/50 µs
100
100
5/310 µs
8/20 µs
14
0
TIA-968-A (formerly FCC part 68) type A
1500
800
10/160 µs
10/560 µs
200
100
10/160 µs
10/560 µs
20
15
TIA-968-A (formerly FCC part 68) type B
1000
9/720 µs
25
5/320 µs
0
Table 2. Absolute maximum ratings (Tamb = 25 °C)
Symbol
IPP
Peak pulse current
ITSM
Non repetitive surge peak on-state current (F = 50 Hz)
ITSM value specified for each line
ITSM value can be applied on both lines at the same time
(GND capability is twice the line ITSM)
VGn
VGp
Negative battery voltage range
Positive battery voltage range
Value
Unit
10/1000 µs
5/310 µs
2/10µs
50
80
150
A
tp = 0.2 s
tp = 1 s
tp = 15 min.
11
7.5
3
A
-120 to 0
0 to +120
V
Operating junction temperature range
-55 to +125
°C
Tstg
Storage temperature range
-55 to +150
°C
TL
Lead solder temperature (10 s duration)
260
°C
Tj
2/10
Parameter
Doc ID025775 Rev 3
LCP22
Characteristics
Figure 3. Pulse waveform
% I PP
100
50
0
tr
t
tp
Table 3. Thermal resistance
Symbol
Rth(j-a)
Parameter
Value
Unit
150
°C/W
Junction to ambient
Table 4. Parameters related to the negative suppressor
Symbol
Parameter
Test conditions
IGn
Negative gate trigger current
VGn/GND = -60 V
Measured at 50 Hz
IH-
Holding current (see Figure 4)
VGn = -60 V
Min.
Max. Unit
5
150
VDGL-
VGn/GND = -60 V
Dynamic switching voltage Gn / TIP or
10/700 µs 2 kV
RING(1)
1.2/50 µs 2 kV
VGnT
Gn to TIP voltage
Rs = 25 Ω
Rs = 25 Ω
IPP = 30 A
IPP = 30 A
IGn = 20 mA
0.7
mA
mA
8
12
V
1.7
V
1. The VDGL value is the difference between the peak line voltage during the surge and the programmed gate voltage.
Table 5. Parameters related to the positive suppressor
Symbol
IGp
Parameter
Positive gate trigger current
Test conditions
Min. Max. Unit
VGp/GND = 60 V, measured at 50 Hz
VDGL+
VGp/GND = 60 V
Dynamic switching voltage Gp / TIP or
10/700 µs 2 kV
RING(1)
1.2/50 µs
2 kV
VGpR
G P to RING voltage
Rs = 25 Ω
Rs = 25 Ω
IPP = 30 A
IPP = 30 A
IGp = -20 mA
5
mA
8
20
V
2
V
1
1. The VDGL value is the difference between the peak line voltage during the surge and the programmed gate voltage.
Table 6. Parameters related to TIP or RING / GND
Symbol
Parameter
Test conditions
VGp/TIP or RING= +1 V
VGn/TIP or RING= -1 V
IR
Reverse leakage current
VTIP or RING = +120 V
VTIP or RING = -120 V
C
Capacitance TIP or RING / GND
VR = -3 V, F =1 MHz, VGp = 60 V, VGn = -60 V
Doc ID025775 Rev 3
Min.
Max.
Unit
5
5
µA
60
pF
3/10
10
Characteristics
LCP22
Table 7. Recommended gate capacitance
Symbol
Cn, Cp
Component
Gate decoupling capacitance
Min.
Typ.
100
220
Max.
Unit
nF
Figure 4. Relative variation of holding current versus junction temperature
IH[Tj] / IH[Tj=25 °C]
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
T (°C)
0.0
-40
-20
0
20
40
60
80
100
120
Figure 5. Maximum non repetitive surge peak on state current versus overload
duration
20
ITSM (A)
F = 50 Hz
Tj initial = 25 °C
18
16
14
12
10
8
6
4
2
0
t(s)
0.01
0.1
1
10
100
1000
Figure 6. Capacitance versus reverse applied voltage (typical values) with VGn = -90 V
and VGp = +90 V
C (pF)
70
line +
60
line -
50
40
30
20
10
0
4/10
Vline (V)
20
40
60
Doc ID025775 Rev 3
80
100
LCP22
2
Technical information
Technical information
Figure 7. LCP22 concept behavior
Rs
L1
TIP
GND
-Vbat
V Tip
T2
IGn
T1
Th1
Th2
Gp
Gn
Rs
+Vb
Cp
Cn
L2
IGp
RING
GND
V Ring
Figure 7 shows the classical protection circuit using the LCP22 crowbar concept. This
topology has been developed to protect two-battery voltage SLICs. It allows both positive
and negative firing thresholds to be programmed. The LCP22 has two gates (Gn and Gp).
Gn is biased to negative battery voltage -Vbat, while Gp is biased to the positive battery
voltage +Vb.
When a negative surge occurs on one wire (L1 for example), a current IGn flows through the
base of the transistor T1 and then injects a current in the gate of the thyristor Th1 which
turns-on. All the surge current flows through the ground. After the surge, when the current
flowing through Th1 becomes less negative than the negative holding current IH-, Th1
switches off. This holding current IH- is temperature dependent as per Figure 4
When a positive surge occurs on one wire (L1 for example), a current IGp flows through the
base of the transistor T2 and then injects a current in the gate of the thyristor Th2 which
fires. All the surge current flows through the ground. After the surge, when the current
flowing through Th2 becomes less positive than the positive holding current IH+, Th2
switches off. This holding current IH+, typically 20 mA at 25 °C, is temperature dependent
and the same Figure 4 also applies.
The capacitors Cn and Cp are used to speed up the crowbar structure firing during the fast
rise or fall edges. This allows minimization of the dynamic breakover voltage at the SLIC TIP
and RING inputs during fast surges. Please note that these capacitors are generally
available around the SLIC. To be efficient they have to be as close as possible to the LCP22
gate pins (Gn and Gp) and to the reference ground track (or plan). The optimized value for
Cn and Cp is 220 nF.
The series resistors Rs shown in Figure 7 represent the fuse resistors or the PTCs which
are needed to withstand the power contact or the power induction tests imposed by the
country standards. Taking this factor into account, the actual lightning surge current flowing
through the LCP22 is equal to:
I surge = Vsurge / (Rg + Rs)
With
V surge = peak surge voltage imposed by the standard.
Rg = series resistor of the surge generator
Rs = series resistor of the line card (e.g. PTC)
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Technical information
LCP22
For a line card with 50 Ω of series resistors which has to be qualified under GR-1089 1000 V
10/1000 µs surge, the present current through the LCP22 is equal to:
I surge = 1000 / (10 + 50) = 17 A
The LCP22 topology is particularly optimized for the new telecom applications such as fiber
in the loop, WLL systems, and decentralized central office, for example.
Figure 8. Protection of SLIC with positive and negative battery voltages
Line card
-Vbat
Rs (*)
TIP
Gn
Line
220nF
GND
TIP
LCP22
Gp
220nF
SLIC
RING
Rs (*)
RING
+Vb
Rs (*) = PTC or Resistor fuse
Figure 8 shows the classical protection topology for SLIC using both positive and negative
battery voltages. With such a topology the SLIC is protected against surge over +Vb and
lower than -Vbat. In this case, +Vb can be programmed up to +120 V while -Vbat can be
programmed down to -120 V.
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Doc ID025775 Rev 3
LCP22
3
Package information
Package information
•
Epoxy meets UL94, V0
•
Lead-free package
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 9. SO-8 wide dimension definitions
L
D
A2
A
C
A1
K
b
E
e
8
5
E1
1
4
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Package information
LCP22
Table 8. SO-8 wide dimension values
Dimensions
Ref.
Millimeters
Min.
Inches
Max.
Min.
Max.
A
1.70
1.90
2.10
0.07
0.07
0.08
A1
0.05
0.10
0.25
0.00
0.00
0.01
A2
1.65
1.80
1.75
0.06
0.07
0.07
b
0.38
0.43
0.48
0.01
0.02
0.02
c
0.15
0.20
0.25
0.01
0.01
0.01
D
5.14
5.24
5.34
0.02
0.021
0.21
E
5.20
5.30
5.40
0.02
0.021
0.21
E1
7.70
7.80
8.25
0.30
0.031
0.32
0.05
0.05
8.00
0.14
0.31
0.85
0.02
0.03
e
1.27
K
L
0.55
0.75
0.03
Figure 10. SO-8 wide footprint in mm (inches)
Figure 11. Recommended footprint for SO-8/SO-8 wide compatibility
$ PP
& PP
% PP
' PP
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Doc ID025775 Rev 3
LCP22
4
Ordering information
Ordering information
Table 9. Ordering information
5
Order code
Marking
Package
Weight
Base qty
Delivery mode
LCP22-150B1RL
LCP22
SO-8 wide
0.125g
1500
Tape and reel
Revision history
Table 10. Document revision history
Date
Revision
Changes
07-Feb-2014
1
Initial release.
03-Jun-2014
2
Updated Figure 1: Functional diagram, Figure 2: Pin-out
configuration and Tj value in Table 2: Absolute maximum ratings
(Tamb = 25 °C).
22-Oct-2014
3
Added Figure 11.
Doc ID025775 Rev 3
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LCP22
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© 2014 STMicroelectronics – All rights reserved
10/10
Doc ID025775 Rev 3
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