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| www.fairchildsemi.com ILC6376/77 0.5A, 300kHz, SO-8 PWM/PFM Step Down Converter with Shutdown Features * * * * * * * * * * 2.5% accurate output voltages Guaranteed 500mA output current 95% efficiency 55A no load battery input current (ILC6377) 1.5A shutdown current Built in short circuit and overcurrent protection Undervoltage lockout and soft-start External transistor drive available for higher IOUT 300kHz operation Automatic switchover to PFM mode at low currents for longest battery life (ILC6377) * Fixed 3.3V or 5V or adjustable output * SO-8 package Description The ILC6376/77 is a 95% efficient, 300kHz step-down DCDC converter in an SO-8 package; capable of delivering 500mA output current. The device is also capable of driving an external FET for higher output current applications. The ILC6376/77 uses a unique p-channel architecture with built-in charge pump to maintain low on-resistance, even at low input voltages. The ILC6376 operates in PWM mode with 300kHz switching frequency. The ILC6377 does the same at high and medium load currents. When the load current drops and the device hits approximately 25% duty cycle, ILC6377 automatically switches over to PFM or pulse skipping mode. PFM (pulse frequency modulation) mode of operation extends efficiency at light loads. Start-up is controlled via an external soft-start capacitor. The device will automatically re-enter start-up mode when an output current overload condition is sensed; thus providing automatic short-circuit protection. Voltage lockout prevents faulty operation below the minimum operating voltage level. In shutdown, the ILC6376/77 consumes only 1.5A current. The ILC6376/77SOXX offers fixed 3.3V or 5V output while ILC6376/77SOADJ allows adjustable output. Both versions of ILC6376/77 are available in an SO-8 surface mount package. Applications * * * * Cellular Phones Palmtops and PDAs Portable Instrumentation Buck Converter for Industrial / Networking Applications Typical Applications SD1 VIN *CIN 1 + 2 3 4 8 S/D 10F ILC6376/77 (TOP VIEW) 7 6 5 + L 22H VOUT CL 47F CSS Fig 1. Typical step-down DC-DC converter application SD1: SS12 Schottky Diode (FAIRCHILD) CL: 10V/47F Tantalum Capacitor (NICHICON, F93) CSS: 4700pF Ceramic Capacitor CIN: 16V / 10F Tantalum Capacitor (NICHICON, F93) Rev. 1.5 November 2001 (c)2001 Fairchild Semiconductor Corporation ILC6376/77 Pin Assignments VIN EXT2 P_BST S/D, CSS 1 2 3 4 8 LX EXT1 GND VOUT VIN EXT2 P_BST S/D, CSS 1 2 3 4 8 LX EXT1 GND FB ILC6376/77 (TOP VIEW) 7 6 5 ILC6376/77 (TOP VIEW) 7 6 5 ILC6376/77 SOXX SO-8 Package ILC6376/77 SOADJ SO-8 Package Pin Definitions Pin 1 2 3 4 5 6 7 8 Symbol VIN EXT2 P-BST S/D, Softstart, VREF VOUT / FB GND EXT1 LX Output voltage sense pin for ILC6376/77SO-XX; 1V feedback pin for ILC6376/77SO-ADJ Ground connection External gate drive pin (low when P-Ch FET is ON) Inductor Switch Pin Power Supply External gate drive pin (low when P-Ch FET is ON) P-Ch gate boost Shutdown, also soft-start capacitor pin and VREFoutput Function Internal Block Diagram VIN VOUT 1 5 8 LX + Error Amp - 7 EXT1 + PWM Comp GATE DRIVER 2 EXT2 3 P_BST S/D, 4 Softstart, Vref S/D, Vref with Softstart Protection PWM/PFM CONTROLLER RAMP WAVE GENERATOR, OSCILLATOR 6 GND (c)2001 Fairchild Semiconductor Corporation 2 ILC6376/77 Absolute Maximum Ratings (TA=25C) Parameter VIN Input Voltage Pin VOUT Pin (ILC6376/77SOXX) FB Pin (ILC6376/77SOADJ) Voltage on LX pin Peak Switch Current on LX pin Voltage on P_BST pin Current EXT1, EXT2 pins Voltage on all other pins Continuous Total Power Dissipation Operating Ambient Temperature Storage Temperature Symbol VIN VOUT VFB VLX ILX VDP_BST IEXT1, IEXT2 ~ PD TOPR TSTG Ratings -0.3 to +12 -0.3 to +12 -0.3 to VIN +0.3 VIN - VLX = -0.3 to +12 700 VIN - VP_BST = -0.3 to +12 50 -0.3 to VIN + 0.3 300 -30~+80 -40~+125 Units V V V mA V mA V mW C C Electrical Characteristics ILC6376/77SO33 VOUT = 3.3V, VIN = 4V, FOSC=300kHz, IOUT = 130mA, TA = 25C, unless otherwise specified. Circuit configuration figure 1. Parameter Output Voltage Input Voltage Output Maximum Current Input Current Supply Shutdown Current LX Switch On - Resistance LX Switch Leakage Current Oscillator Frequency Max Duty Cycle PFM Duty Cycle Efficiency Undervoltage Lockout Soft-Start Time Shutdown Input Voltage EXT1, EXT2 Hi OnResistance EXT1, EXT2 Low OnResistance Symbol VOUT VIN IOUT(MAX) IIN IS/D Rds(on) ILXL FOSC MAXDTY PFMDTY EFFI VUVLO TSS VSD REXtHI REXtLOW Conditions Min. 3.218 500 VIN 3.5V, No Loads ILC6376 ILC6377 Typ. 3.300 600 1480 50 1.5 0.64 Max. 3.383 10 2190 86 2.5 0.85 2.0 255 300 100 25 95 345 Units V V mA A A A kHz % % % V msec V VS/D = 0V Open Loop Measurement, VS/D = VIN, VLX = VIN - 0.2V, VOUT = 3V Open Loop Measurement, VOUT = VIN, VLX = 0V Measurement Waveform at EXT pin VIN = 3.6V IOUT = 20mA No Load (ILC6377) Minimum VIN when Vref does not start up VREF rises to 0V from 0.9V High = Regulator "ON" Low = Regulator "OFF" 3V applied to VOUT with no external components 3.6V applied to VOUT with no external components 15 0.9 6.0 0.65 35 1.8 10.0 16.0 0.2 47 37 35 29 (c)2001 Fairchild Semiconductor Corporation 3 ILC6376/77 Electrical Characteristics ILC6376/77SO50 Unless Otherwise specified all limits are at VOUT = 5.0V, VIN = 6V, FOSC=300kHz, IOUT = 200mA, TA = 25C. Circuit configuration figure 1. Parameter Output Voltage Input Voltage Output Maximum Current Input Supply Current Shutdown Current LX Switch On-Resistance LX Switch Leakage Current Oscillator Frequency Symbol VOUT VIN IOUT(MAX) IIN IS/D Rds(on) ILXL FOSC VIN 5.25V, No Load VS/D = 0V Open Loop Measurement, VS/D = VIN, VLX =VIN - 0.2V, VOUT = 4.5V Open Loop Measurement, VOUT = VIN, VLX = 0V Measure Waveform at EXT pin VIN = 5.3V IOUT = 20mA No Load (ILC6377) Minimum VIN when VREF does not start up VREF rises to 0V from 0.9V High = Regulator "ON" Low = Regulator "OFF" Open Loop Measurement Open Loop Measurement 255 300 ILC6376 ILC6377 500 600 2540 71 1.5 0.44 3740 110 2.5 0.58 2.0 345 Conditions Min. Typ. Max. 5.125 10 Units V V mA A A A kHz 4.875 5.000 Max Duty Cycle PFM Duty Cycle Efficiency Undervoltage Lockout Soft-Start Time Shutdown Input Voltage EXT1, EXT2 Hi OnResistance EXT1, EXT2 Low OnResistance MAXDTY PFMDTY EFFI VUVLO TSS VS/D REXtHI REXtLOW 0.9 6.0 0.65 15 100 25 95 1.8 10.0 16 0.2 24 20 32 26 35 % % % V msec V (c)2001 Fairchild Semiconductor Corporation 4 ILC6376/77 Electrical Characteristics ILC6376/77SOADJ Unless Otherwise specified all limits are at VOUT programmed to 5.0V, VIN = 6V, FOSC=300kHz, IOUT = 200mA, TA = 25C. Circuit configuration figure 1. Parameter Feedback Voltage (pin 5) Output Voltage Output Maximum Current Input Supply Current Shutdown Current LX Switch On-Resistance LX Leak Current Oscillator Frequency Max Duty Cycle PFM Duty Cycle Efficiency Undervoltage Lockout Soft-Start Time Shutdown Input Voltage EXT1, EXT2 Hi OnResistance EXT1, EXT2 Low OnResistance Symbol VFB VOUT IOUT(MAX) IIN IS/D Rds(on) ILXL FOSC MAXDTY PFMDTY EFFI VUVLO TSS VS/D REXtHI REXtLOW Minimum VIN when VREF does not start up VREF rises to 0V from 0.9V High = Regulator "ON" Low = Regulator "OFF" Open Loop Measurement Open Loop Measurement 0.9 6.0 0.65 0.2 24 20 32 26 10.0 No Load (ILC6377) 15 VIN 5.25V, No Load VS/D = 0V Open Loop Measurement, VS/D = VIN, VLX = VIN - 0.2V, VOUT = 4.5V Open Loop Measurement, VOUT = VIN, VLX = 0V Measure Waveform at EXT pin VIN = 5.3V IOUT = 20mA 255 300 100 25 95 1.8 16.0 35 RFB1 + RFB2 < 2M Conditions Min. .995 1.5 500 600 71 1.5 0.44 110 2.5 0.58 2.0 345 Typ. 1.000 Max. 1.015 6 Units V V mA A A A kHz % % % V msec V (c)2001 Fairchild Semiconductor Corporation 5 ILC6376/77 SD1 VIN *CIN 1 + 2 3 4 8 S/D 10F ILC6376/77 (TOP VIEW) 7 6 5 + L 22H VOUT CL 47F CSS Fig 1. Typical step-down DC-DC converter application SD1: SS12 Schottky Diode (FAIRCHILD) CL: 10V/47F Tantalum Capacitor (NICHICON, F93) CSS: 4700pF Ceramic Capacitor CIN: 16V / 10F Tantalum Capacitor (NICHICON, F93) Figure 1 shows a typical fixed output voltage step-down DC-DC converter application circuit for ILC6376/77SOXX. External component selection Proper selection of external components is important for achieving high performance. The output inductor selected should have low DC resistance on the order of 0.2 or less and saturation current rating of 1A or higher. Recommended inductors are Sumida CD54 (22H, 0.18 max DC resistance) or Coilcraft DO3308P-223 (22H, 0.18 max DC resistance) or equivalent. The catch diode should be a schottky diode with low forward drop and rated at 1A or greater current, SS12 or it's equivalent is recommended. Input and output capacitors should be tantalum capacitors with low equivalent series resistance (ESR) and voltage rating higher than the actual application. Over-current and short-circuit protection In the event of an over-current or short-circuit condition, the ILC6376/77 cycles the soft-start pin in a hiccup mode to provide fault protection. When the output voltage decreases due to overload, the ILC6376/77 will operate continuously at the maximum duty cycle. If the period of maximum duty cycle operation exceeds TPRO (typically 5 msec), pin 4 will be pulled low; thus discharging the external soft-start capacitor CSS. This action inhibits the regulator's PWM action. Next, the ILC6376/77's soft-start circuitry starts recharging CSS and initiates a controlled start-up. If the overload condition continues to exist, the above sequence of events will repeat; thus continuing to cycle the soft-start function. Note that very little power is dissipated with this method of fault protection versus constant current limit protection. Even though the internal power MOSFET is pulsed on and off at high peak current, the DC current is low; thus leading to low power dissipation even under short-circuit conditions. Keep in mind that the duration of maximum duty cycle condition is used to trigger the ILC6376/77's fault protection circuit. As such, a small input-output (V IN - VOUT) differential voltage may trigger the device's fault protection circuitry even at low output current. Soft-start Pin 4 of ILC6376/77 functions as the soft-start pin as well as the shutdown pin. A soft-start capacitor (from pin 4 to ground) controls the rate at which the power supply starts up; thus preventing large overshoots at the output as well as large in-rush current. The value for CSS should be 100pF or greater. Shutdown The ILC6376/77 is placed in shutdown mode by taking pin 4 to ground. In shutdown, the quiescent current of the device is under 2A. When using the shutdown feature, pin 4 must be driven from an open collector or open drain output without employing an external pull-up resistor, as shown in figure 2. Undervoltage Lockout The undervoltage lockout feature prevents faulty operation by disabling the operation of the regulator when input voltage is below the minimum operating voltage, VUVLO. When the input voltage is lower than VUVLO the device disables the internal P-channel MOSFET and provides "high" output at both EXT1 and EXT2 outputs. (c)2001 Fairchild Semiconductor Corporation 6 ILC6376/77 To pin 8 EXT1 VIN *CIN SD1 + 1 2 3 4 8 7 6 5 + VOUT L 6 5 S/D ILC6376/77 (TOP VIEW) CFB RFB1 RFB2 VOUT CL RFB1 + RFB2 < 2MW CSS 1 C FB chosen so that 1kHz < 2 x x CFB x RFB1 < 20kHz Fig.2 1Amp output current application using external MOSFET The EXT1 and EXT2 pins are provided so as to drive external transistors; thus allowing design flexibility. The EXT1 output drive signal has the same timing as the gate drive to the internal P-channel MOSFET i.e. EXT1 output is low as long as the internal MOSFET is on. Both EXT1 and EXT2 pins are capable of driving 1000pF gate capacitance. For example, a high output current application circuit using an external P-channel MOSFET is shown in figure 2. Fig.4 Adjustable output using ILC6376/77SOADJ (Note: rest of circuit is same as Fig.1) Adjustable Output (ILC6376/77SOADJ) For adjustable output voltage ILC6376/77SOADJ should be used. All connections to the ILC6376/77SOADJ are the same as ILC6376/77SOXX, except for the feedback voltage divider network shown in figure 4. The output voltage, VOUT, can be calculated from the following equation: VOUT = VFB (1 + RFB1/RFB2), where VFB is approximately 1V and RFB1 + RFB2 < 2M 1 8 CBST 2200pF SD2 MBR0520L Schottky 2 3 4 ILC6376/77 (TOP VIEW) 7 6 5 The feedback compensation capacitor should be chosen such that the pole frequency f is between 1kHz and 20kHz: 1 1kHz < 2 x x CFB x RFB1 < 20kHz Voltage between Vin and P_BST must be less than 10V. Figure 3. P-Channel Negative Boost Circuit P-Channel Boost Circuit The ILC6376/77 includes a unique P-Channel MOSFET architecture with built-in charge pump to maintain low onresistance even at low input voltages. As shown in figure 3, a 2200pF ceramic capacitor and a schottky diode (MBR0520L or equivalent) allows the gate voltage of the internal P-Channel MOSFET to be driven negative; thus reducing the switch on-resistance. This technique can be employed to increase efficiency at low input voltages and high output currents. Note that the voltage between VIN and P_BST should not exceed 10V, otherwise damage to the device may occur. For high input voltage applications the schottky diode should be replaced by a low voltage zener diode so that the P_BST pin is clamped to a safe negative voltage. The pole frequency should generally be set at 5kHz. The value of CFB calculated from the above equation may require some adjustment depending on the output inductor (L) and output capacitor (CL) values chosen. Example for 3V output: RFB1 = 400k RFB2 = 200k CFB = 100pF PC Board Layout As with all switching DC-DC converter designs, good PC board layout is critical for optimum performance. The heavy lines indicated in figure 1 schematic should be wide printed circuit board traces and should be kept as short as is practical. A large ground plane with as much copper area as is allowable should be used. All external components should be mounted as close to the IC as possible. For ILC6376/77SOADJ, the feedback resistors and their associated wiring should be kept away from the inductor location and the vicinity of inductive flux. (c)2001 Fairchild Semiconductor Corporation 7 ILC6376/77 Typical Performance Characteristics General conditions for all curves: Circuit 1; L = 20H (Sumida, CD54), CIN = 47F (tantalum) with 0.1F (ceramic), CL = 47H (tantalum) SS12 schottky diode, CSS = 4700pF (ceramic), TA = 25C unless otherwise noted. Output Voltage vs. Output Current 3.5 Output Voltage vs. Output Current 3.5 ILC6377SO33 L = 22H (CD54) ILC6376SO33 L = 22H (CD54) 10.0V OUTPUT VOLTAGE: VOUT(V) 3.4 5.0V VIN = 3.96 OUTPUT VOLTAGE: VOUT(V) 3.4 3.3 8.0V 3.3 VIN = 3.96V, 5.0V,8.0V 3.2 3.2 3.1 3.1 3.0 0.1 1 10 100 1000 3.0 0.1 1 10 100 1000 OUTPUT CURRENT: IOUT(mA) OUTPUT CURRENT: IOUT(mA) Output Voltage vs. Output Current 3.5 Output Voltage vs. Output Current 3.5 ILC6377SO33 L = 10H (CD54) ILC6377SO-33 L = 47H (CD105) OUTPUT VOLTAGE: VOUT(V) OUTPUT VOLTAGE: VOUT(V) 3.4 5.0V VIN = 3.96 3.4 VIN = 4.0V 5.0V 3.3 8.0V 3.3 3.2 3.2 8.0V 3.1 3.1 3.0 0.1 1 10 100 1000 3.0 0.1 1 10 100 1000 OUTPUT CURRENT: IOUT(mA) OUTPUT CURRENT: IOUT(mA) Output Voltage vs. Output Current 5.4 Output Voltage vs. Output Current 5.4 ILC6377SO50 10.0V L = 22H (CD54) ILC6376SO50 L =22H (CD54) 5.2 6.0V OUTPUT VOLTAGE: VOUT(V) OUTPUT VOLTAGE: VOUT(V) 5.2 10.0V 5.0 8.0V 5.0 6.0V 8.0V 4.8 4.8 4.6 4.6 4.4 0.1 1 10 100 1000 4.4 0.1 1 10 100 1000 OUTPUT CURRENT: IOUT(mA) OUTPUT CURRENT: IOUT(mA) (c)2001 Fairchild Semiconductor Corporation 8 ILC6376/77 Typical Performance Characteristics General conditions for all curves: Circuit 1; L = 20H (Sumida, CD54), CIN = 47F (tantalum) with 0.1F (ceramic), CL = 47H (tantalum) SS12 schottky diode, CSS = 4700pF (ceramic), TA = 25C unless otherwise noted. Efficiency vs. Output Current 100 Efficiency vs. Output Current 100 ILC6377SO33 VIN = 4.0V L = 22H (CD54) ILC6376SO33 5.0V L = 22H (CD54) EFFICIENCY: EFFI(%) 5.0V 8.0V EFFICIENCY: EFFI(%) 80 80 VIN = 4.0V 10.0V 60 60 8.0V 40 40 20 20 0 0.1 1 10 100 1000 0 0.1 1 10 100 1000 OUTPUT CURRENT: IOUT(mA) OUTPUT CURRENT: IOUT(mA) Efficiency vs. Output Current 100 Efficiency vs. Output Current 100 ILC6377SO33 VIN = 3.96V L = 10H (CD54) ILC6377SO33 L = 47H (CD105) EFFICIENCY: EFFI(%) 5.0V 8.0V EFFICIENCY: EFFI(%) 80 80 5.0V VIN = 4.0V 8.0V 60 60 40 40 20 20 0 0.1 1 10 100 1000 0 0.1 1 10 100 1000 OUTPUT CURRENT: IOUT(mA) OUTPUT CURRENT: IOUT(mA) Efficiency vs. Output Current 100 Efficiency vs. Output Current 100 ILC6377SO50 L = 22H (CD54) ILC6376SO50 5.0V L = 22H (CD54) EFFICIENCY: EFFI(%) EFFICIENCY: EFFI(%) 80 8.0V 10.0 VIN = 6.0V 80 VIN = 3.96V 8.0V 10.0V 60 60 40 40 20 20 0 0.1 1 10 100 1000 0 0.1 1 10 100 1000 OUTPUT CURRENT: IOUT(mA) OUTPUT CURRENT: IOUT(mA) (c)2001 Fairchild Semiconductor Corporation 9 ILC6376/77 Typical Performance Characteristics General conditions for all curves: Circuit 1; L = 20H (Sumida, CD54), CIN = 47F (tantalum) with 0.1F (ceramic), CL = 47H (tantalum) SS12 schottky diode, CSS = 4700pF (ceramic), TA = 25C unless otherwise noted. Output vs. Ambient Temperature 3.40 Stand-by Current vs. Ambient Temperature ILC6377SO33 100 ILC6377SO33 SUPPLY CURRENT: IIN(A) OUTPUT VOLTAGE (V) 3.35 80 60 3.30 40 3.26 20 3.20 -40 -20 0 20 40 60 80 0 -40 -20 0 20 40 60 80 AMBIENT TEMP.: TA (C) AMBIENT TEMP.: TA (C) Output Voltage vs. Ambient Temperature SWITCH RESISTANCE: RDS(ON)() 3.40 On Resistance vs. Ambient Temperature ILC6377SO33 1.2 ILC6377SO33 STAND-BY CURRENT (A) 3.35 1.0 3.30 0.8 3.25 0.6 3.20 0.4 0.2 -40 -20 0 20 40 60 80 -40 -20 0 20 40 60 80 AMBIENT TEMP.: TA (C) AMBIENT TEMP.: TA (C) Oscillation Frequency vs. Ambient Temperature OSCILLATION FREQUENCY: FOSC(kHz) 400 PFM Duty Ration vs. Ambient Temperature ILC6377SO33 3.40 ILC6377SO33 PFM DUTY RATIO: PFMDTY(%) 350 3.35 3.30 300 3.25 250 3.20 200 -40 -20 0 20 40 60 80 -40 -20 0 20 40 60 80 AMBIENT TEMP.: TA (C) AMBIENT TEMP.: TA (C) (c)2001 Fairchild Semiconductor Corporation 10 ILC6376/77 Typical Performance Characteristics General conditions for all curves: Circuit 1; L = 20H (Sumida, CD54), CIN = 47F (tantalum) with 0.1F (ceramic), CL = 47H (tantalum) SS12 schottky diode, CSS = 4700pF (ceramic), TA = 25C unless otherwise noted. Efficiency vs. Ambient Temperature ILC6377SO33 100 Minimum Operating Voltage vs. Ambient Temperature ILC6377SO33 MIN. OPERATING VOLTAGE: VOUT(V) 1.8 EFFICIENCY: EFFI(%) 90 1.6 80 1.4 70 1.2 60 1.0 50 -40 0.8 -40 -20 0 20 40 60 80 -20 0 20 40 60 80 AMBIENT TEMP.: TA (C) AMBIENT TEMP.: TA (C) Soft-Start Time vs. Ambient Temperature ILC6377SO33 CE "H" Voltage vs. Ambient Temperature ILC6377SO33 1.0 SOFT-START TIME: TSS(ms) CE "H" VOLTAGE: VCEL(V) -20 0 20 40 60 80 16 0.8 12 0.6 8 0.4 4 0.2 0 -40 0 -40 -20 0 20 40 60 80 AMBIENT TEMP.: TA (C) AMBIENT TEMP.: TA (C) CE "L" Voltage vs. Ambient Temperature ILC6377SO33 1.0 CE "L" VOLTAGE: VCEL(V) 0.8 0.6 0.4 0.2 0.8 -40 -20 0 20 40 60 80 AMBIENT TEMP.: TA (C) (c)2001 Fairchild Semiconductor Corporation 11 ILC6376/77 Ordering Information ILC6376SO33 ILC6376SO50 ILC6376ADJ ILC6377SO33 ILC6377SO50 ILC6377SOADJ 3.3V, 300kHz step-down PWM converter 5V, 300kHz step-down PWM converter Adjustable, 300kHz step-down PWM converter 3.3V, 300kHz step-down PWM/PFM converter 5V, 300kHz step-down PWM/PFM converter Adjustable, 300kHz step-down PWM/PFM converter 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 11/21/01 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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