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ILC6363
Step-Up/Step Down DC-DC Converter for 1-Cell Lithium-Ion Batteries
Features
* ILC6363CIR-36: Fixed 3.6V output; custom voltages possible * ILC6363CIR-ADJ: Adjustable output to 6V maximum * Capable of 500mA output current * Peak efficiency: > 90% at VOUT = 3.6V, IOUT = 300mA, VIN = 3.6V * No external diode is required (synchronous rectification) * Battery input current of 250A at no load * True load disconnect from battery input in shutdown (1A) * OSC freq: 300kHz 15% * Low battery detector with 100ms transient rejection delay * Power good output flag when V OUT is in regulation * MSOP-8 package
Description
The ILC6363 step-up/step-down DC-DC converter is a switch mode converter, capable of supplying up to 500mA output current, at a fixed or user selectable output voltage. The range of input, and output voltage options makes the ILC6363 ideal for Lithium-ion (Li-ion), or any other battery application, where the input voltage range spans above and below the regulated output voltage. When ILC6363's input voltage exceeds the output voltage by more than 800mV, the output will begin to track the input linearly. The ILC6363 is a direct replacement for ILC6360, in applications where SYNC pin is not used. The PFM or PWM operating mode is user selectable through SEL pin connected to ground or left open, respectively. The choice should be dependent upon the current to be delivered to the load: PFM is recommended for input voltage higher that 1.5V and loads below 100mA,while PWM is recommended for more than 50mA load current In shutdown mode, the device allows true load disconnect from battery input. Configured as a 300kHz, fixed frequency PWM boost converter, the ILC6363 performs the buck operation in PFM mode, when the output voltage rises near the positive range of regulation. The ILC6363 is unconditionally stable with no external compensation; the sizes of the input and output capacitors influence the ripple on the input, and output voltages. Since the ILC6363 has an internal synchronous rectifier, the standard fixed voltage version requires minimal external components: an inductor, an input capacitor, and an output capacitor. An additional 100F ceramic output capacitor will help reduce output ripple voltage. Other features include a low battery input detector with 100ms transient rejection delay built-in, and, a power good indicator useful as a system power on reset.
Applications
* Cellular phones * Palmtops, PDAs and portable electronics * Equipment using single Lithium-Ion batteries
Typical Circuit
IN 100mF
C
ILC6363CIR-ADJ L 1 15mH 2 R5 3 LBI/SD SEL LBO VFB 6 5 R6 4
Low Battery Detector Output Power Good Output
Optimized to Maximize Battery Life
8 + 7 + VOUT
3.6V/500mA
VIN
2.7V to 4.2V
VIN
GND
ON OFF
80
Typical Li-ion Battery Discharge Curve
3.6
MSOP-8
PWM PFM
70 Time
3.0
Figure 1
Rev. 1.3
(c)2001 Fairchild Semiconductor Corporation
Battery Voltage (V)
LX
VOUT
ILC6363 Efficiency (%)
+
COUT 10F 100F
ILC6363 Efficiency @ IOUT = 300mA
90
4.2
ILC6363
Pin Assignments
LX VIN LB/SD SEL
1 2 3 4 8 7 6 5
VOUT GND LBO POK
LX VIN LB/SD SEL
1 2 3 4
8 7 6 5
VOUT GND LBO VFB
MSOP
(TOP VIEW)
MSOP
(TOP VIEW)
ILC6363CIR-XX
ILC6363CIR-ADJ
Pin Definitions
Pin Number
1 2
Pin Name LX VIN LBI/SD
Pin Function Description Inductor input. Inductor L connected between this pin and the battery Connect directly to battery Low battery detect input and shutdown. Low battery detect threshold is set with this pin using a potential divider. If this pin is pulled to logic low then the device will shutdown. A low logic level signal applied to this pin selects PFM operation mode. If the pin is left open or high logic level is applied, PWM mode is selected. This open drain output pin will go high when output voltage is within regulation, 0.92*VOUT(NOM) < VOUT < 0.98*VOUT(NOM) This pin sets the adjustable output voltage via an external resistor divider network. The formula for choosing the resistors is shown in the "Applications Information" section. This open drain output will go low if the battery voltage is below the low battery threshold set at pin 3. Connect this pin to the battery and system ground This is the regulated output voltage
3
4
SEL POK (ILC6363CIR-XX
5
VFB (ILC6363CIR-ADJ) LBO GND VOUT
6 7 8
Absolute Maximum Ratings
Parameter Voltage on VOUT pin Voltage on LBI, Sync, LBO, POK, VFB, LX and VIN pins Peak switch current on LX pin Current on LBO pin Continuous total power dissipation at 85C Short circuit current Operating ambient temperature Maximum junction temperature Storage temperature Lead temperature (soldering 10 sec.) Package thermal resistance
(c)2001 Fairchild Semiconductor Corporation
Symbol VOUT ILX ISINK(LBO) PD ISC TA TJ(MAX) Tstg JA
Ratings -0.3 to 7 -0.3 to 7 1 5 315 Internally protected (1 sec. duration) -40 to 85 150 -40 to 125 300 206
Units V V A mA mW A C C C C C/W
2
ILC6363
Electrical Characteristics ILC6363CIR-36 in PWM mode (SEL open)
TA = 25C, VIN = VLBI = 3.6V, IOUT = 50mA, unless otherwise specified. The * denotes specifications which apply over the specified operating temperature range. (Note 1) Parameter Input Voltage Output Voltage Feedback Voltage (ILC 6363-ADJ only) Output Voltage Adjustment Range (ILC6363CIRADJ only) Output Current Symbol VIN VOUT VFB * VOUT(adj) min VOUT (adj) max VIN = 3.3V, IOUT = 50mA Conditions VOUT = VOUT(NOM) 4% (Note 3) 2.8V < VIN < 4.2V Min. 2.7 3.528 1.225 1.212 3.600 1.250 Typ. Max. VOUT(NOM) + 0.8 3.672 1.275 1.288 Units V V V
2.5 6
V
IOUT
VIN = 3.6V, VOUT = VOUT(NOM) 4% (Note 3) 50mA < IOUT < 500mA 50mA < IOUT < 300mA 50mA < IOUT < 200mA IOUT = 300mA IOUT = 0mA
500
mA
Load Regulation
VOUT VOUT (no load) IIN (no load)
4 1 1 93 250
%
Efficiency No Load Battery Input Current
% A
Electrical Characteristics ILC6363CIR-36 in PFM mode (SEL in LOW state)
TA = 25C, VIN = VLBI = 3.6V, IOUT = 50mA, unless otherwise specified. The * denotes specifications which apply over the specified operating temperature range. (Note 1) Parameter Output Voltage Output Current Load Regulation No Load Battery Input Current Efficiency Symbol VOUT * IOUT VOUT VOUT IIN (no load) VIN = 2.7V, VOUT = VOUT(NOM) 4% 1mA < IOUT < 20mA IOUT = 0mA IOUT = 20mA, VIN = 2.7V Conditions Min. 3.456 3.420 Typ. 3.6 100 1 250 88 Max. 3.744 3.780 Units V mA % A %
(c)2001 Fairchild Semiconductor Corporation
3
ILC6363
General Electrical Characteristics
TA = 25C, VIN = VLBI = 3.6V, IOUT = 50mA, unless otherwise specified. The * denotes specifications which apply over the specified operating temperature range. (Note 1)
Parameter LBO output voltage low LBO output leakage current Shutdown input voltage low Shutdown input voltage high SEL input voltage high SEL input voltage low POK output voltage low POK output voltage high POK output leakage Current POK threshold POK hysteresis Feedback voltage (ILC6363CIR-ADJ only) Output voltage adjustment range (ILC6363CIR-ADJ only) VOUT(ADJ) min VOUT(ADJ) max VIN = 0.9V, IOUT = 50mA VIN = 3V, IOUT = 50mA 6 VTH(POK) VHYST VFB * 1.225 1.212 2.5V V 0.92xV OUT 0.95xVO UT 0.98xVO UT 50 1.250 1.275 1.288 V V mV Symbol VLBO(low) ILBO(hi) VSD(low) VSD(hi) VSEL(hi) VSEL(low) VPOK(low) VPOK(hi) IL(POK) Force 6V at pin 5 ISINK = 2mA, open drain output * * * * * * 1 1.5 0.4 0.4 6 2 VLBI = 1V VLBO = 5V * 1 2 0.4 6 A V V V V V V A Conditions ISINK = 2mA, open drain output, * Min Typ Max 0.4 Units V
Minimum startup voltage Input voltage range Battery input current in load disconnect mode Switch on resistance Oscillator frequency LBI input threshold Input leakage current LBI hold time
VIN(start) VIN IIN(SD) Rds(on) fosc VREF I LEAK
IOUT = 10mA, PWM mode VOUT = VOUT(nominal) 4% IOUT = 10mA (Note 3) VLBI/SD < 0.4V, VOUT = 0V (short circuit) N-Channel MOSFET P-Channel MOSFET
* * * 0.9 1
0.9
1
VOUT(nominal) +
0.8V
V V A
1 400 750 300 1.250
10
* * Pins LB/SD,SEL and VFB,
(Note 4)
255 1.175 1.150
345 1.325 1.350 200
m kHz
nA mS
tHOLD(LBI) (Note 5)
100
120
Notes: 1. Absolute maximum ratings indicate limits which, when exceeded, may result in damage to the component. Electrical specifications do not apply when operating the device outside its rated operating conditions. 2. Specified min/max limits are production tested or guaranteed through correlation based on statistical control methods. Measurements are taken at constant junction temperature as close to ambient as possible using low duty pulse testing. 3. VOUT (NOM) is the nominal output voltage at IOUT = 50mA in PWM mode. 4. Guaranteed by design. 5. In order to get a valid low-battery-output (LBO) signal, the input voltage must be lower than the low-battery-input (LBI) threshold for a duration greater than the low battery hold time (thold(LBI)). This feature eliminates false triggering due to voltage transients at the battery terminal.
(c)2001 Fairchild Semiconductor Corporation
4
ILC6363
APPLICATIONS INFORMATION
The ILC6363 performs boost DC-DC conversion by controlling the switch element as shown in the simplified circuit in figure 3 below.
cycle determines the minimum load current that can maintain the output voltage within specified values. There are two key advantages of the PWM type controllers. First, because the controller automatically varies the duty cycle of the switch's on-time in response to changing load conditions, the PWM controller will always have an optimized waveform for a steady-state load. This translates to very good efficiency at high currents and minimal ripple on the output. Ripple is due to the output cap constantly accepting and storing the charge received from the inductor, and delivering charge as required by the load. The "pumping" action of the switch produces a sawtooth-shaped voltage as seen by the output. The other key advantage of the PWM type controllers is that the radiated noise due to the switching transients will always occur at the (fixed) switching frequency. Many applications do not care much about switching noise, but certain types of applications, especially communication equipment, need to minimize the high frequency interference within their system as much as possible. Using a boost converter requires a certain amount of higher frequency noise to be generated; using a PWM converter makes that noise highly predictable thus easier to filter out. PFM Mode Operation For low loads the ILC6363 can be switched to PFM, or Pulse Frequency Modulation, technique at low currents. This technique conserves power loss by only switching the output if the current drain requires it. As shown in the figure 5, the waveform actually skips pulses depending on the power needed by the output. This technique is also called "pulse skipping" because of this characteristic. In the ILC6363, the switchover from PWM to PFM mode is determined by the user to improve efficiency and conserve power The Dual PWM/PFM mode architecture was designed specifically for applications such as wireless communications, which need the spectral predictability of a PWM-type DCDC converter, yet also need the highest efficiencies possible, especially in Standby mode.
Switch Waveform
Figure 3: Basic Boost Circuit
When the switch is closed, current is built up through the inductor. When the switch opens, this current has to go somewhere and is forced through the diode to the output. As this on and off switching continues, the output capacitor voltage builds up due to the charge it is storing from the inductor current. In this way, the output voltage gets boosted relative to the input. In general, the switching characteristic is determined by the output voltage desired and the current required by the load. Specifically the energy transfer is determined by the power stored in the coil during each switching cycle. PL = (tON, VIN) Synchronous Rectification The ILC6363 also uses a technique called "synchronous rectification" which removes the need for the external diode used in other circuits. The diode is replaced with a second switch or in the case of the ILC6363, an FET as shown in figure 4 below.
VIN LX
SW1 SW2
+
ILC6363
VOUT
PWM/PFM CONTROLLER
POK GND
SHUTDOWN CONTROL
+ VREF
DELAY
LBO
-
SEL
LB/SD
Figure 4: Simplified ILC6383 block diagram
The two switches now open and close in opposition to each other, directing the flow of current to either charge the inductor or to feed the load. The ILC6363 monitors the voltage on the output capacitor to determine how much and how often to drive the switches. PWM Mode Operation The ILC6363 uses a PWM or Pulse Width Modulation technique. The switches are constantly driven at typically 300kHz. The control circuitry varies the power being delivered to the load by varying the on-time, or duty cycle, of the switch SW1 (see fig. 5). Since more on-time translates to higher current build-up in the inductor, the maximum duty cycle of the switch determines the maximum load current that the device can support. The minimum value of the duty
(c)2001 Fairchild Semiconductor Corporation
V SET
V OUT
Figure 5: PFM Waveform
5
ILC6363
Other Considerations The other limitation of PWM techniques is that, while the fundamental switching frequency is easier to filter out since it's constant, the higher order harmonics of PWM will be present and may have to be filtered out, as well. Any filtering requirements, though, will vary by application and by actual system design and layout, so generalizations in this area are difficult, at best. However, PWM control for boost DC-DC conversion is widely used, especially in audio-noise sensitive applications or applications requiring strict filtering of the high frequency components. Low Battery Detector The ILC6363's low battery detector is a based on a CMOS comparator. The negative input of the comparator is tied to an internal 1.25V (nominal) reference, V REF. The positive input is the LBI/SD pin. It uses a simple potential divider arrangement with two resistors to set the LBI threshold as shown in Figure 6. The input bias current of the LBI pin is only 200nA. This means that the resistor values R1 and R2 can be set quite high. The formula for setting the LBI threshold is: VLBI = VREF x (1+R5/R6) Since the LBI input current is negligible (<200nA), this equation is derived by applying voltage divider formula across R6. A typical value for R6 is 100k. R5 = 100kW x [(VLBI/VREF) -1], where VREF=1.25V (nom.) The LBI detector has a built in delay of 120ms. In order to get a valid low-battery-output (LBO) signal, the input voltage must be lower than the low-battery-input (LBI) threshold for a duration greater than the low battery hold time (thold(LBI)) of 120msec. This feature eliminates false triggering due to voltage transients at the battery terminal caused by high frequency switching currents.
2 VIN ILC6363 Shutdown R5 3 LBI/SD R6 + DELAY 100ms 3.3V RPU 6 LBO
The output of the low battery detector is an open drain capable of sinking 2mA. A 10k pull-up resistor is recommended on this output. For VLBI < 1.25V The low battery detector can also be configured for voltages <1.25V by bootstrapping the LBI input from VOU . The circuitry for this is shown in figure 7.
ILC6363 R2 VIN R1 3 LBI/SD + 1.25V Internal Reference 7 GND 8 VOUT
Figure 7: VLBI < 1.25V
The following equation is used when VIN is lower than 1.25V R1 = R2 x [(VREF - VIN) / (VOUT - VREF)], where VREF = 1.25V (nom.) This equation can also be derived using voltage divider formula across R2. A typical value for R2 is 100k. Shut Down The LBI pin is shared with the shutdown pin. A low voltage (<0.4V) will put the ILC6363 into a power down state. The simplest way to implement this is with an FET across R6 as shown in figure 8. Note that when the device is not in PWM mode or is in shutdown the low battery detector does not operate. When the ILC6363 is shut down, the synchronous rectifier disconnects the output from the input. This ensures that there is only leakage (IIN < 1A typical) from the input to the output so that the battery is not drained when the ILC6363 is shut down.
2 VIN ILC6363 R5 3 LBI/SD R6 7 GND
ON/OFF
1.25V Internal Reference 7 GND
Figure 6: Low Battery Detector
Figure 8: Shut Down Control
(c)2001 Fairchild Semiconductor Corporation
6
ILC6363
Power Good Output (POK) The POK output of the ILC6363 indicates when VOUT is within the regulation tolerance of the set output voltage. POK output is an open drain device output capable of sinking 2mA. It will remain pulled low until the output voltage has risen to typically 95% of the specified VOUT. Note that a pull-up resistor must be connected from the POK output (pin 5 of ILC6363CIR-XX) to either ILC6363's output or to some other system voltage source. Adjustable Output Voltage Selection The ILC6363-ADJ allows the output voltage to be set using a potential divider. The formula for setting the adjustable output voltage is; VOUT = VFB x (1+R1/R2) Where VFB is the threshold set which is 1.25V nominal.
CIN
100 F
External Component Selection
Inductors The ILC6363 is designed to work with a 15H inductor in most applications. There are several vendors who supply standard surface mount inductors to this value. Suggested suppliers are shown in table 1. Higher values of inductance will improve efficiency, but will reduce peak inductor current and consequently ripple and noise, but will also limit output current. Vendor Coilcraft Part Number D03308P-153 D03316P-153 D01608C-153 LQH4N150K LQH3C150K CDR74B-150MC CD43-150 CD54-150 NLC453232T-150K Contact (847) 639-6400
muRata Sumida
(814) 237-1431 (847) 956-0666
ILC6363-ADJ L 1 LX VIN LBI/SD SEL VOUT GND LBO VFB 8 + 7 6 5 R2 MSOP-8 PWM PFM VOUT = 1.25 (1+R1/R2)
100F COUT
VOUT
VIN 1 to 3-cell ON OFF R6 R5
15mH 2 3 4
TDK
R1
(847) 390-4373
Capacitors
Input Capacitor The input capacitor is necessary to minimize the peak current drawn from the battery. Typically a 10F tantalum capacitor is recommended. Low equivalent series resistance (ESR) capacitors will help to minimize battery voltage ripple Output Capacitor Low ESR capacitors should be used at the output of the ILC6363 to minimize output ripple. The high switching speeds and fast changes in the output capacitor current, mean that the equivalent series impedance of the capacitor can contribute greatly to the output ripple. In order to minimize these effects choose an output capacitor with less than 10nH of equivalent series inductance (ESL) and less than 100m of equivalent series resistance (ESR). Typically these characteristics are met with ceramic capacitors, but may also be met with certain types of tantalum capacitors. Suitable vendors are shown in table 2.
Description T495 series tantalum 595D series tantalum TAJ, TPS series tantalum Y5V Ceramic Vendor Kemet Sprague AVX TDK AVX muRata Contact (864) 963-6300 (603) 224-1961 (803) 946-0690 (847) 390-4373 (803) 946-0690
www.murata.com
Figure 9: Adjustable Voltage Configuration
Negative Voltage Output It is possible to generate a negative output voltage as a secondary supply using the ILC6363. This negative voltage may be useful in some applications where a negative bias voltage at low current is required.
1A Schottky Diodes -V 0.01F 0.01F ILC6363
1
L VIN
LX VIN
2
Figure 10: Negative Output Voltage
(c)2001 Fairchild Semiconductor Corporation
7
ILC6363
Layout and Grounding Considerations High frequency switching and large peak currents means PCB design for DC-DC converters requires careful consideration. A general rule is to place the DC-DC converter circuitry well away from any sensitive RF or analog components. The layout of the DC-DC converters and its external components are also based on some simple rules to minimize EMI and output voltage ripple. Layout 1. Place all power components, ILC6363, inductor, input capacitor and output capacitor as close together as possible. 2. Keep the output capacitor as close to the ILC6363 as possible with very short traces to the V OUT and GND pins. Typically it should be within 0.25 inches or 6mm. 3. Keep the traces for the power components wide, typically >50mil or 1.25mm. 4. Place the external networks for LBI and VFB close to the ILC6363, but away from the power components as far as possible. Grounding 1. Use a star grounding system with separate traces for the power ground and the low power signals such as LBI/SD and VFB. The star should radiate from where the power supply enters the PCB. 2. On multilayer boards use component side copper for grounding around the ILC6363 and connect back to a quiet ground plane using vias.
CIN
1 0 0 F
ILC6363 L1 1 LX VIN LBI/SD SEL VOUT GND LBO VFB 8 7 6 5 R2 +
COUT 100F
VOUT
VIN
15H 2 3
R1
R3 Load
ON/OFF PWM PFM 4
Local "Quiet" Ground Power Ground
Recommended application circuit schematic for ILC6363CIR-ADJ
(c)2001 Fairchild Semiconductor Corporation
8
ILC6363
U1
U1
ILC6363XX
L1 C2
100F
ILC6363ADJ
L1 8 C1
100F
1 15H 2V IN ON OFF 3 LBI 4 SEL
LX
VOUT
R1
R3
VOUT VIN
C2
100F
1 15H 2V IN ON OFF 3 LBI 4 SEL
LX
VOUT
8
100F
VOUT C1 R1 LBO VFB R2 R3 10K
VIN
GND 7 LBO 6 POK/VFB 5
10K LBO POK
GND 7 LBO 6 POK/VFB 5
10K
SEL GND PWM PFM R4 1M U2
SEL GND 1M PWM PFM R4 U2
NOTE: R1 and R2 are user determined values to set VOUT= VFB(1+R1/R2)
Evaluation Board Parts List for Printed Circuit Board Shown Above
Label U1 C L1 R1 and R2 R3 R4 Part Number ILC6363CIR-ADJ GRM44-1 X5R 107K 6.3 LQS66C150M04 muRata muRata Dale, Panasonic Dale, Panasonic Dale, Panasonic Manufacturer Fairchild Semiconductor Description Step-up DC-DC converter 100F, ceramic capacitor 15H, 1.3A User determined values 10k, 1/10W, SMT 1M, 1/10W, SMT
Label U1 C L1 R1 and R3 R4
Part Number ILC6363CIR-XX GRM44-1 X5R 107K 6.3 LQS66CA50M04 muRata muRata
Manufacturer Fairchild Semiconductor
Description Step-up DC-DC converter 100F, ceramic capacitor 15H, 1.3A 10k, 1/10W, SMT 1M, 1/10W, SMT
Dale, Panasonic Dale, Panasonic
(c)2001 Fairchild Semiconductor Corporation
9
ILC6363
Typical Performance Characteristics ILC6363CIR-36
Unless otherwise specified: TA = 25C, CIN = 100F, C OUT = 10F, 100F, L = 15H, V
OUT
= 3.6V (nominal)
(c)2001 Fairchild Semiconductor Corporation
10
ILC6363
Typical Performance Characteristics ILC6363CIR-36
Unless otherwise specified: TA = 25C, CIN = 100F, C OUT = 10F, 100F, L = 15H, V
OUT
= 3.6V (nominal)
(c)2001 Fairchild Semiconductor Corporation
11
ILC6363
Typical Performance Characteristics ILC6363CIR-36
Unless otherwise specified: TA = 25C, CIN = 100F, C OUT = 10F, 100F, L = 15H, V
OUT
= 3.6V (nominal)
(c)2001 Fairchild Semiconductor Corporation
12
ILC6363
Package Dimensions
MSOP-8
0.122 (3.1) 0.114 (2.9)
Pin 1 identifier
0.122 (3.1) 0.114 (2.9)
0.244 (5.15) 0.228 (4.65)
0.025 (.65)BSC 0.009 (.23) 0.005 (.13)
0.043 (1.1) 0.031 (.80)
(0-10)
0.016 (.40) 0.01 (.25)
0.006 (.15) 0.004 (.05)
0.027 (.70) 0.016 (.40)
DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user.
www.fairchildsemi.com 10/15/01 0.0m 001 Stock#DSxxxxxxxx 2001 Fairchild Semiconductor Corporation
2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.

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