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NCP1800 Single-Cell Lithium Ion Battery Charge Controller
The NCP1800 is a constant current, constant voltage (CCCV) lithium ion battery charge controller. The external sense resistor sets the full charging current, and the termination current is 10% of the full charge current (0.1 C). The voltage is regulated at 1% during the final charge stage. There is virtually zero drain on the battery when the input power is removed.
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* * * * * * * * * *
Integrated Voltage and Programmable Current Regulation Integrated Cell Conditioning for Deeply Discharged Cell Integrated End of Charge Detection Better than 1% Voltage Regulation Charger Status Output for LED or Host Processor Interface Charge Interrupt Input Safety Shutoff for Removal of Battery Adjustable Charge Current Limit Input Over and Under Voltage Lockout Micro8 Package
8 1
Micro8t CASE 846A DM SUFFIX
PIN CONNECTIONS AND MARKING DIAGRAM
ISNS ISEL COMP/DIS GND 1 180X AYW 2 3 4 8 7 6 5 OUT VCC CFLG VSNS
Applications
* Cellular Phones, PDAs * Handheld Equipment * Battery Operated Portable Devices
PMOS/Schottky (FETKYt): NTHD4P02FT1 (ChipFETt) PMOS: NTGS3441T1 (TSOP 6) Schottky: MBRM130L RSNS Vin
X = A for 41 Device B for 42 Device A = Assembly Location L = Wafer Lot Y = Year W = Work Week
ORDERING INFORMATION
Device NCP1800DM41R2 NCP1800DM42R2 Package Micro8 Micro8 Shipping 4000 Units/Reel 4000 Units/Reel
OUT VCC ISNS NCP1800 VSNS Host or LED Host Processor CFLG COMP/ DIS RCOMP Cin
GND
ISEL RISEL 60 k Cout
CCOMP
RCOMP = 15 W, CCOMP = 560 nF
Figure 1. Typical Application
(c) Semiconductor Components Industries, LLC, 2003
1
May, 2003 - Rev. 4
Publication Order Number: NCP1800/D
NCP1800
RSNS Cin VCC Active Pullup OUT ISNS
CC
VSNS
Chip Enable ISEL IREF VREF VREF Input UV Lockout
CONTROL
CV
VREF
EOC Detect
EOC REF
RISEL
LOGIC VREF Pre CHG Complete VREF
VREF CFLG
Input OV Lockout
VSNS Overvoltage
VREF Cout
GND
COMP/DIS
Figure 2. NCP1800 Internal Block Diagram PIN FUNCTION DESCRIPTIONS
Pin 1 2 3 Symbol ISNS ISEL COMP/DIS Description This is one of the inputs to the current regulator and the end-of-charge comparator. A resistor from this pin to ground pin sets the full charging current regulation level. This is a multifunctional pin that is used for compensation and can be used to interrupt charge with an open drain/collector output from a microcontroller. When this pin is pulled to ground, the charge current is interrupted. This is the ground pin of the IC. This is an input that is used to sense battery voltage and is the other input to the current regulator. It also serves as the input to the battery overvoltage comparator. An open drain output that indicates the battery charging status. This is a multifunctional pin that powers the device and senses for over and undervoltage conditions. This is a current source driver for the pass transistor.
4 5 6 7 8
GND VSNS CFLG VCC OUT
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NCP1800
MAXIMUM RATINGS
Rating Supply Voltage Voltage Range for: VSNS Input ISNS Input COMP/DIS Input ISEL Input CFLG Output Out Output OUT Sink Current Thermal Resistance, Junction to Air Operating Ambient Temperature Operating Junction Temperature Storage Temperature Symbol VCC -0.3 to 6.0 -0.3 to 6.0 -0.3 to 6.0 -0.3 to 6.0 -0.3 to 6.0 -0.3 to VCC Io RqJA TA TJ Tstg 20 240 -20 to +85 -20 to +150 -55 to +150 mA C/W C C C Value 16 Unit V V
ATTRIBUTES
Characteristic ESD Protection Human Body Model (HBM) per JEDEC standard JESD22-A114 Machine Model (MM) per JEDEC standard JESD22-A114 Moisture Sensitivity, Indefinite Time Out of Drypack (Note 1) Transistor Count Latch-up Current Maximum Rating per JEDEC standard JESD78 1. For additional information, see Application Note AND8003/D. Value 2 kV 200 V Level 1 1015 150 mA
ELECTRICAL CHARACTERISTICS (TA = 25C for typical values, -20C < TA < 85 C for min/max values, unless otherwise noted.)
Characteristic Input Supply Voltage (Note 2) Input Supply Current Regulated Out ut Voltage Output Full-Charge Current Reference Voltage VCC = 6.0 V, 3.0 V t VSNS t 4.2 V, RISEL = 60 KW, TA = 25C Full-Charge Current Reference Voltage Temperature Coefficient VCC = 6.0 V, 3.0 V t VSNS t 4.2 V, RISEL = 60 KW Pre-Charge Current Reference Voltage VCC = 6.0 V, VSNS t 3.0 V, RISEL = 60 KW, TA = 25C Pre- Charge Current Reference Voltage Temperature Coefficient VCC = 6.0 V, VSNS t 3.0 V, RISEL = 60 KW Pre-Charge Threshold Voltage VCC Under Voltage Lockout Voltage Hysteresis of VCC Under Voltage Lockout (VUVLO), TA = 25C Hysteresis of VCC Under Voltage Lockout Voltage (VUVLO) Temperature Coefficient End-of-Charge Voltage Reference VCC = 6.0 V, VSNS u 4.2 V, RISEL = 60 KW, TA = 25C End-of-Charge Voltage Reference Temperature Coefficient VCC = 6.0 V, VSNS u 4.2 V, RISEL = 60 KW NCP1800DM41 NCP1800DM42 NCP1800DM41 NCP1800DM42 Symbol VCC ICC VREG VFCHG TCVFCHG VPCHG TCVPCHG VPCTH VUVLO VEOC TCVEOC Min 2.5 4.059 4.158 210 13.2 2.78 2.85 3.43 90 20 Typ 140 4.1 4.2 240 -0.163 24 -0.180 2.93 3.0 3.56 150 0.261 24 -0.160 Max 16 250 4.141 4.242 270 34.8 3.08 3.15 3.69 195 28 Unit V mA V mV %/C mV %/C V V mV %/C mV %/C
2. See the "External Adaptor Power Supply Voltage Selection" section of the application note to determine the minimum voltage of the charger power supplies.
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NCP1800
ELECTRICAL CHARACTERISTICS (continued)
(TA = 25C for typical values, -20C < TA < 85 C for min/max values, unless otherwise noted.) Characteristic Charge Disable Threshold Voltage (ICOMP = 100 mA min.) VCC Over Voltage Lockout Hysteresis of VCC Over Voltage Lockout (VOVLO),TA = 25C Hysteresis of VCC Over Voltage Lockout (VOVLO) Temperature Coefficient VSNS Over Voltage Lockout Hysteresis of VSNS Over Voltage Lockout (VSOVLO), TA = 25C Hysteresis of VSNS Over Voltage Lockout (VSOVLO) Temperature Coefficient TA = 25C Full Charge Current Range with RSNS = 0.4 W Full Charge Current Range with RSNS = 0.8 W Battery Drain Current (VSNS + ISNS) VCC = Ground, VSNS = 4.2 V CFLG Pin Output Low Voltage (CFLG = LOW, ICFLG = 5.0 mA) CFLG Pin Leakage Current (CFLG = HIGH) NCP1800DM41 NCP1800DM42 Symbol VCDIS VOVLO VSOVLO Min 6.95 90 4.3 4.4 40 Typ 7.20 150 0.39 4.4 4.5 70 0.52 Max 0.08 7.45 180 4.5 4.6 100 Unit V V mV %/C V mV %/C
IREG1 IREG2 IBDRN VCFLGL ICFLGH
600 300 -
-
1000 600 0.5 0.35 0.1
mA mA mA V mA
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NCP1800
VPCTH, PRE-CHARGE THRESHOLD VOLTAGE (V) 3.5 VPCHG, PRE-CHARGE CURRENT REFERENCE VOLTAGE (mV) 24.75 24.70 24.65 24.60 24.55 24.50 24.45 24.40 24.35 24.30 24.25 24.20 3.5 4 4.5 5 5.5 6 6.5 7 VCC, INPUT SUPPLY VOLTAGE (V) VFCHG, FULL-CHARGE CURRENT REFERENCE VOLTAGE (V) VSNS = 2.5 V RISEL = 60 kW RSNS = 0.4 W
3
2.5
2
1.5 1 3.5 4 4.5 5 5.5 6 6.5 7 VCC, INPUT SUPPLY VOLTAGE (V)
Figure 3. Pre-Charge Threshold Voltage versus Input Supply Voltage
26 24 22 20 18 16 14 12 10 8 6 4 2 0 0.5 0.9 1.3
Figure 4. Pre-Charge Current Reference Voltage versus Input Supply Voltage
0.243 0.2425 0.242 0.2415 0.241 0.2405 0.24 3.2 3.4 3.6 3.8 4.0 4.2 VSNS, BATTERY VOLTAGE (V) VCC = 5 V RISEL = 60 kW RSNS = 0.4 W
VPCHG, PRE-CHARGE REFERENCE CURRENT THRESHOLD VOLTAGE (mV)
VCC = 5 V RISEL = 60 kW RSNS = 0.4 W
1.7
2.1
2.5
2.9
VSNS, BATTERY VOLTAGE (V)
Figure 5. Pre-Charge Current Reference Voltage versus Battery Voltage
VFCHG, CHARGE CURRENT REFERENCE VOLTAGE (V) 0.2415 0.241 0.2405 0.24 0.2395 0.239 0.2385 4.5 5 5.5 6 6.5 VSNS = 3.6 V RISEL = 60 kW RSNS = 0.4 W
Figure 6. Full-Charge Current Reference Voltage versus Battery Voltage
24.5 24.4 24.3 24.2 24.1 24 23.9 23.8 4.5 5 5.5 6 6.5 7 VCC, INPUT SUPPLY VOLTAGE (V) RISEL = 60 kW RSNS = 0.4 W
7
VCC, INPUT SUPPLY VOLTAGE (V)
Figure 7. Full-Charge Current Reference Voltage versus Input Supply Voltage
VEOC, END OF CHARGE REFERENCE VOLTAGE (mV)
Figure 8. End of Charge Reference Voltage versus Input Supply Voltage
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NCP1800
IBDRN, BATTERY DRAIN CURRENT (mA) IPCHG, PRE-CHARGE CURRENT (mA) 1000 VCC = 5 V VSNS = 2.5 V RSNS = 0.4 W 100 CALCULATED MEASURED 10 IPCHG + (10 1 10 100 1000 RISEL, CURRENT PROGRAMMING RESISTANCE (kW) (1.19 12e3) RISEL RSNS)
0.48 0.44 0.40 0.36 0.32 0.28 0.24 0.2 2.5 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 VSNS, BATTERY VOLTAGE (V) VCC = 0
Figure 9. Battery Drain Current versus Battery Voltage
Figure 10. Pre-Charge Current versus Current Programming Resistor
IREG, FULL-CHARGE CURRENT (mA)
1000 MEASURED CALCULATED VCC = 5 V VSNS = 3.6 V RSNS = 0.4 W VEOC/VFCHG (V/V)
0.11 0.10 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 1000 25 50 75 100 125 150 175 200 225 250 275 300 RISEL, CURRENT PROGRAMMING RESISTANCE (kW) VCC = 5 V RSNS = 0.4 W
(1.19 IREG + (RISEL 100 10
12e3) RSNS) 100
RISEL, CURRENT PROGRAMMING RESISTANCE (kW)
Figure 11. Full-Charge Current versus Current Programming Resistor
Figure 12. VEOC/VFCHG versus Current Programming Resistor
250 ICC, INPUT SUPPLY CURRENT (mA) VSNS = 4.7 V VSOVLO Activated
200
150 VSNS < VSOVLO IREG = 0 A
100
50 0 5 6 7 8 9 10 11 12 13 14 15 16 VCC, INPUT SUPPLY VOLTAGE (V)
Figure 13. Input Supply Current versus Input Supply Voltage
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NCP1800
Fault Modes: 1. Charger Low Output (VCC < VUVLO) 2. Runaway Charger (VCC > VOVLO) 3. Battery Removed (VSNS > VSOVLO)
Fault Detected OR VCDIS = Low
End of Charge CFLG:Low OUT:High
Fault Detected OR VCDIS = Low
No Fault Detected
Fault Detected OR VCDIS = Low
Trickle Charge CFLG:Low OUT:VREG Fault Detected OR VCDIS = Low VUVLO < VCC < VOVLO & VSNS < VSOVLO
ISNS 0.1 IREG
Pre- Charge CFLG:High OUT:0.1 IREG
VSNS VPCTH
Full-Charge CFLG:High OUT:1 IREG
VSNS VREG
Final Charge CFLG:High OUT:VREG
VSNS < VPCTH
VSNS < VREG
ISNS > 0.1 IREG
Figure 14. NCP1800 State Machine Diagram
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NCP1800
Set CFLG LOW Start
Fault Mode OR VCDIS = LOW N Set CFLG HIGH
Y
Fault Mode OR VCDIS = LOW
Y
N
Set ICHARGE = IREG/10 Conditioning Phase
Y
VSNS < VPCTH
N
Set ICHARGE = IREG
Fault Mode OR VCDIS = LOW Current Regulation Phase N
Y
N
VSNS > VREG
Y
Fault Mode OR VCDIS = LOW Voltage Regulation Phase N
Y
N
Y ISNS < IREG/10 Fault Mode OR VCDIS = LOW N
Fault Modes: 1. Charger Low Output (VCC < VUVLO) 2. Runaway Charger (VCC > VOVLO) 3. Battery Removed (VSNS > VSOVLO)
Y Set CFLG Low
Figure 15. NCP1800 Charging Operational Flow Chart
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NCP1800
VREG
Voltage
VPCTH 0.9 V
time
IREG Current CFLG = High CFLG = Low (ISNS < 0.1 X IREG)
0.1 x IREG time Pre-Charge Phase Full-Charge Phase Final Charge Phase Trickle Charge Phase
Figure 16. Typical Charging Algorithm
Charge Status
Conditions Pre-Charge, Full-Charge and Final Charge End-of-Charge, Trickle Charge and Faults CFLG Pin High-Z Low
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NCP1800
Operation Descriptions The NCP1800 is a linear lithium ion (Li-ion) battery charge controller and provides the necessary control functions for charging Li-ion batteries precisely and safely. It features the constant current and constant voltage method (CCCV) of charging.
Conditioning and Pre-charge Phase
The NCP1800 initiates a charging cycle upon toggling the COMP/DIS to LOW or application of the valid external power source (i.e. VUVLO t VCC t VOVLO) with the Li-ion battery present or when the Li-ion battery is inserted. Before a charge cycle can begin, the battery conditions are verified to be within safe limits. The battery will not be charged when its voltage is less than 0.9 V or higher than VSOVLO. Li-ion batteries can be easily damaged when fast charged from a completely discharged state. Also, a fully discharged Li-ion battery may indicate an abnormal battery condition. With the built-in safety features of the NCP1800, the Li-ion battery pre-charges (Pre-Charge Phase) at 10% of the full rated charging current (IREG) when the battery voltage is lower than VPCTH and the CFLG pin is HIGH. Typically, the battery voltage reaches VPCTH in a few minutes and then the Full Charge phase begins.
Full Charge (Current Regulation) Phase
Since the external P channel MOSFET is used to regulate the current to charge the battery and operates in linear mode as a linear regulator, power is dissipated in the pass transistor. Designing with a very well regulated external adaptor (e.g. 5.1 V 1%) can help to minimize the heat dissipation in the pass transistor. Care must be taken in heat sink designing in enclosed environments such as inside the battery operated portables or cellular phones. The Full Charge phase continues until the battery voltage reaches VREG. The NCP1800 comes in two options with VREG thresholds of 4.1 and 4.2 V.
Final Charge (Voltage Regulation) Phase
Once the battery voltage reaches VREG, the pass transistor is controlled to regulate the voltage across the battery and the Final Charge phase (constant voltage mode) begins. Once the charger is in the Final Charge phase, the charger maintains a regulated voltage and the charging current will begin to decrease and is dependent on the state of the charge of the battery. As the battery approaches a fully charged condition, the charge current falls to a very low value.
Trickle Charge Phase
When the battery voltage reaches VPCTH, the NCP1800 begins fast charging the battery with full rate charging current IREG. The NCP1800 monitors the charging current at the ISNS input pin by the voltage drop across a current sense resistor, RSNS, and the charging current is maintained at IREG by the pass transistor throughout the full charge phase. IREG is determined by RSNS and RISEL with the following formula:
(1.19 IREG + (RISEL 12 k) RSNS)
During the Final Charge phase, the charging current continues to decrease and the NCP1800 monitors the charging current through the current sense resistor RSNS. When the charging current decreases to such a level that ISNS < 0.1 X IREG, the CFLG pin is set to LOW and the Trickle Charge phase begins. The charger stays in the Trickle Charge phase until any fault modes are detected or the COMP/DIS pin is pulled low to start over the charging cycle.
And with RISEL = 60 k and RSNS = 0.4 W, IREG = 0.6 A.
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NCP1800
NTHD4P02FT1 Vin = 5.2 V RSNS 2.0
120 mA OUT VCC CFLG VSNS NCP1800 Cin 10 n COMP/ DIS GND RCOMP 15 CCOMP 560 n
ISNS ISEL
Li-ion Cout 10 m
GND
RISEL 60 k
Figure 17. Typical Application Circuit for Lower Capacity Batteries (120 mAh shown here)
NTGS3441T1 & MBRM130L -ORNTHD4P02FT1 Vin = 5.2 V RSNS 0.4
600 mA OUT VCC CFLG VSNS NCP1800 Cin 10 n COMP/ DIS GND RCOMP 15 CCOMP 560 n
ISNS ISEL
Li-ion Cout 10 m
GND
RISEL 60 k
Figure 18. Typical Application Circuit for Higher Capacity Batteries (600 mAh shown here)
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NCP1800
Selecting External Components
External Adaptor Power Supply Voltage Selection
With:
VIN(min) + 5.0 V VREG + 4.2 V IREG + 0.6 A RSNS + 0.4 W
Since the NCP1800 is using a linear, charging algorithm, the efficiency is lower. Adapter voltage selection must be done carefully in order to minimize the heat dissipation. In general, the power supply input voltage should be around 5.0 to 6.0 V. The minimum input voltage should be chosen to minimize the heat dissipation in the system. Excessively high input voltages can cause too much heat dissipation and will complicate the thermal design in applications like cellular phones. With the overvoltage protection feature of the NCP1800, input voltages higher than 7.0 V will activate the overvoltage protection circuit and disconnect the power supply input to the battery and other circuitry. For the application shown in Figure 18 (assuming NTGS3441 and MBRM130L):
VIN(min) u Li- ion regulated voltage, VREG ) (0.6 A)(RDS(ON)) ) VF of Schottky Diode ) voltage drop of RSNS u 4.2 V ) (0.6 A) (100 mW) ) 0.38 V ) (0.6 A) (0.4 W) + 4.88 V ] 4.9 V
Dropout across pass element =
5.0 V * 4.2 V * 0.38 V * (0.6 A) (0.4 W) + 0.18 V
Maximum RDS(on) should be less than (0.18 V)/(0.6 A) = 0.3 W at 0.6 A.
VIN(min) + 5.0 V VREG + 4.2 V IREG + 0.12 A RSNS + 2.0 W
Dropout across pass element = 5.0 V - 4.2 V - 0.43 V (0.12)(2.0 W) = 0.13 V. Therefore, maximum RDS(on) should be less than (0.13 V)/(0.12 A) = 1.08 W at 0.12 A.
External Output Capacitor
Therefore, for the application shown in Figure 17 (assuming NTHD4P01FT1):
VIN(min) u Li- ion regulated voltage u 4.2 V ) (0.12 A)(130mW) ) 0.43 ) (0.12 A)(2.0 W) + 4.89 V ] 4.9 V
If the output voltage accuracy is 5%, then a typ. 5.2 V 5% output voltage adaptor must be used. And for a very good regulated adaptor of accuracy 1%, 5.0 V 1% output voltage adaptor can then be used. It is obvious that if tighter tolerance adaptors are used, heat dissipation can be minimized by using lower nominal voltage adaptors.
Pass Element Selection
Any good quality output filter can be used, independent of the capacitor's minimum ESR. However, a 10 mF tantalum capacitor or electrolytic capacitor is recommended at the output to suppress fast ramping spikes at the VSNS input and to ensure stability for 1.0 A at full range. The capacitor should be mounted with the shortest possible lead or track length to the VSNS and GND pins.
Current Sense Resistor
The type and size of the pass transistor is determined by input-output differential voltage, charging current, current sense resistor and the type of blocking diode used. The selected pass element must satisfy the following criteria: Drop across pass element =
VIN(min) * Li- ion regulated voltage * VF * IREG RSNS
The charging current can be set by the value of the current sense resistor as in the previous formula. Proper de-rating is advised when selecting the power dissipation rating of the resistor. If necessary, RISEL can also be changed for proper selection of the RSNS values. Take note of the recommended full-char ge current ranges specified in the electrical characteristics section. Also notice the effect of RISEL on the accuracy of pre-charge current and end-of-charge detection as noted in Figures 10 and 12, respectively.
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NCP1800
PACKAGE DIMENSIONS
Micro8 DM SUFFIX CASE 846A-02 ISSUE F
-ANOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSION A DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.15 (0.006) PER SIDE. 4. DIMENSION B DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSION. INTERLEAD FLASH OR PROTRUSION SHALL NOT EXCEED 0.25 (0.010) PER SIDE. 5. 846A-01 OBSOLETE, NEW STANDARD 846A-02. DIM A B C D G H J K L MILLIMETERS MIN MAX 2.90 3.10 2.90 3.10 --- 1.10 0.25 0.40 0.65 BSC 0.05 0.15 0.13 0.23 4.75 5.05 0.40 0.70 INCHES MIN MAX 0.114 0.122 0.114 0.122 --- 0.043 0.010 0.016 0.026 BSC 0.002 0.006 0.005 0.009 0.187 0.199 0.016 0.028
K
-B-
PIN 1 ID
G D 8 PL 0.08 (0.003)
M
TB
S
A
S
-T-
SEATING PLANE
0.038 (0.0015) H
C J L
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NCP1800
ChipFET is a trademark of Vishay Siliconix. FETKY and Micro8 are trademarks of International Rectifier Corporation.
ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. "Typical" parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer.
PUBLICATION ORDERING INFORMATION
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NCP1800/D

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