SENMTECH Today's Resulcs .. Tomorrow's Vision 1.0 & 3.0 AMP MINICONVERTER SWITCHING REGULATORS LM2575 LM2576 April 7, 1998 DESCRIPTION The LM2575/6 series switching regulators are mono- lithic integrated circuits designed for use in buck or buck/boost regulator applications requiring accurate output voltages over combined variations of line, load and temperature. This unique series greatly simplifies switching power supply design. The LM2575 has a maximum output current of 1A and the LM2576 is rated for 3A. The LM2575/6 series miniconverters include a switching regulator and compensation network all within the same package. Just add a choke, catch diode and two capacitors to obtain an efficient DC-to- DC converter. Current limit and thermal shutdown features of the LM2575/6 series fully protect the device against overstress conditions. The LM2575/6 series offers an alternative to popular 3 terminal linear regulators by providing higher efficiency with reduced heatsink size. In many applications a heat sink will not be required. BLOCK DIAGRAM TEL:805-498-2111 FAX:805-498-3804 WEB:hittp:/Awww.semtech.com FEATURES e Pin for pin interchangeable with Nationals LM2575/LM2576 series @ DC-to-DC buck or buck/boost converter requiring only 4 support components Fixed or adjustable voltages Preset output voltages of 3.3, 5 and 12V Wide output voltage range, 1.23 to 35V 82% typical efficiency @ 5V Wide input voltage range, 4V to 40V Inhibit/enable control pin ABSOLUTE MAXIMUM RATINGS Input On /oFr FEEDBACK INTERNAL RESISTORS FOR FIXED OPTIONS ONLY Parameter Symbol |Maximum| Units Input Voltage Vin 45 V On/Off Pin Input Voltage -0.3<V<V iy V Output Voltage to Common (Steady -1 V State) Power Dissipation Internally Po | Limited Ww Thermal Resistance Junction to Case TO-220 Bic 2.0 C/N TO-263 2.0 Thermal Resistance Junction to Ambient TO-220 rn 55 C/N TO-263 60 Operating Junction Temperature Range T, |-40 to 125 C Storage Temperature Range Tse |-40 to 125 Cc bo GND ORDERING INFORMATION DEVICE PACKAGE CURRENT LM2575T-XX TO-220 1A LM2575S-XX TO-263 LM2576T-XX TO-220 3A LM2576S-XX TO-263 Notes: (1) XX = Voltage Option 3.3, 5.0, 12, and ADJ (1.23V to 35V). (2) T-XX = Straight in-line; T-XX-V = Vertical Stag- gered; T-XX-H = Horizontal Staggered. (3) Add suffix TR for tape and reel (TO-263). Lead Temperature (Soldering) 10 Sec | [te40 260 Cc ESD Class 2 1 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 913201.0 & 3.0 AMP MINICONVERTER LM2575 SEMTECH SWITCHING REGULATORS LM2576 April 7, 1998 ELECTRICAL CHARACTERISTICS Unless otherwise specified, V,, = 12V for 3.3V, 5V and ADJ options; 25V for 12V; Vy; = 5V for ADJ, T, = 25C. Vij rated = 40V; 1, = 0.5 to 3A (LM2576), 0.2 to 1A (LM2575). Test Conditions Test Limits Parameter Symbol Vin lo T Min Typ Max | Units Output Voltage Vo 0.5A 3.23 3.30 3.37 V LM2576-3.3 8V to O.T. 3.14 3.30 3.47 V, Rated 3.20 3.30 | 3.40 LM2576-5 Vo 0.5A 4.90 5.00 5.10 V 8V to O.T. 4.76 5.00 5.25 V, Rated 4.85 5.00 | 5.15 LM2576-12 Vo 0.5A 11.76 12.00 12.24 V 15V to O.T. 11.40 12.00 12.60 Vi Rated 11.52 12.00 12.48 Feedback Voltage lee 0.5A 1.217 1.230 1.243 V Vour = 5V 8V to O.T. 1.180 1.230 1.280 LM2576-ADJ Vi Rated 1.193 1.230 1.267 Feedback Bias Current Ip 12V 0.5A 50 100 nA LM2576-ADJ O.T. 500 Output Voltage Vo 0.2A 3.23 3.30 3.37 V LM2575-3.3 8V to O.T. 3.14 3.30 3.47 V, Rated 3.20 3.30 | 3.40 LM2575-5 Vo 0.2A 4.90 5.00 5.10 V 8V to O.T. 4.75 5.00 5.25 V, Rated 4.85 5.00 | 5.15 LM2575-12 Vo 0.2A 11.76 12.00 12.24 V 15V to O.T. 11.40 12.00 12.60 Vi Rated 11.52 12.00 12.48 Feedback Voltage lee 0.2A 1.217 1.230 1.243 V Vour = 5V 8V to O.T. 1.180 1.230 1.280 LM2575-ADJ Vi Rated 1.193 1.230 1.267 oe ADI current ls 12V 0.24 | OT. 500 | nA (CONTINUED NEXT PAGE) 2 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 913201.0 & 3.0 AMP MINICONVERTER LM2575 SEMTECH SWITCHING REGULATORS LM2576 April 7, 1998 ELECTRICAL CHARACTERISTICS (cont.) Test Conditions Test Limits Parameter Symbol Vin lo T Min Typ Max | Units Efficiency/Option 3.3 n 12V LM2575-1A 77 % 5 LM2576-3A 82 12 15V 88 ADJ V, = 5V 12V 82 Switching Frequency Fsx 47 52 58 kHz O.T. 43 52 62 Saturation Voltage Vear LM2575-1A | O.T. 0.9 1.2 V LM2576-3A | O.T. 0.9 1.4 Max Duty Cycle (On) Dc 93 98 % Current Limit lo 4.2 5.8 6.9 A Peak Current LM2576 O.T. 3.5 7.5 Peak Current LM2575 lo. 1.7 2.2 3.0 A O.T. 1.3 3.2 Output Leakage Current Output = OV I Vy RATED 2 mA Output = -1V 7.5 30 Quiescent Current lo 5 10 mA O.T. 12 Standby Quiescent Istay 50 pA Current (On/Off Pin = 5V) O.T. 50 500 On/Off Pin Logic Input Level Vig 2.2 1.4 V Vour = OV O.T. 2.4 1.4 Vour = Option Vie 1.2 1.0 V O.T. 1.2 0.8 On/Off Input Current On/Off = 5V (Off) ly 0.5A 12 30 pA On/Off = OV (On) li 0.5A 0 10 NOTES: (1) Output sourcing current-resistive load, no inductor or capacitor. (2) Feedback = V, + 1.0V. (3) Feedback = OV. (4) Over Temp. (O.T.) = over specified operating junction temperature range. 3 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320| 1.0 & 3.0 AMP MINICONVERTER LM2575 SEMTECH SWITCHING REGULATORS LM2576 April 7, 1998 LM2575 - OPERATIONAL DATA FEEDBACK VOLTAGE VS. NORMALIZED FEEDBACK VOLTAGE DUTY CYCLE (ADJ. VERSION ONLY) VERSION ONL VIN=12V lo=200 mA NORMALIZED TO Tj = 25C lo = 200 mA VIN=40V VIN=7V NORMALIZED FEEDBACK VOLTAGE (mV) FEEDBACK VOLTAGE CHANGE (mV) 75 -50 -25 0 25 50 75 100 125 150 0 20 40 60 80 100 JUNCTION TEMPERATURE (C) DUTY CYCLE(%) SUPPLY CURRENT VS. DUTY CYCLE SUPPLY CURRENT AT GROUND PIN < = = 25C =5V x _ VIN=7V a 5 x Ww w VIN=40V x 2 9 3 * > a 7 ILOAD=1A oa a Zz Ss a a ILOAD = 200mA\ 20 40 60 80 100 0 10 20 30 40 50 DUTY CYCLE (%) INPUT VOLTAGE (V) CURRENT LIMIT SWITCH SATURATION VOLTAGE 3.0 = = w 5 @ G 2.0 5 g z e VIN=25V 3 = z 1.0 < E 2 = < wo 0 he 75 -50 25 0 25 50 75 100 125 150 0.2 0.4 0.6 0.8 1.0 JUNCTION TEMPERATURE (C) SWITCH CURRENT (A) 4 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 913201.0 & 3.0 AMP MINICONVERTER LM2575 SEMTECH SWITCHING REGULATORS LM2576 April 7, 1998 LM2575 - OPERATIONAL DATA DROPOUT VOLTAGE MINIMUM OPERATING VOLTAGE 60 VOUT=1.23V > 50 a AVOUT=5% = a Rind=0.20 Oo 40 2 s 5 g 3.0 g Ek ? > 20 z a = lo=200mA Zz 1.0 0 75 50 -25 0 25 50 75 100 125 150 75 50 25 O 25 50 75 100 125 150 JUNCTION TEMPERATURE (C) JUNCTION TEMPERATURE (C) FEEDBACK PIN CURRENT LINE REGULATION (ADJ. VERSION) 5 x O TO VIN=10V z o lo=200mA. 50 zt VOUT=5V E a Tj=25C z as WwW 25 we ow w= ao Lu 3 ag eo Ni 5 a6 2 2 < a z* a o w= z ins 75 0 10 20 30 40 50 75 -50 = -25 0 25 50 75 100 125 150 INPUT VOLTAGE (V) JUNCTION TEMPERATURE (C) OSCILLATOR FREQUENCY NORMALIZED AT 25C 6 NORMALIZED FREQUENCY (%) o 9 75 50 25 O 25 50 75 100 125 150 JUNCTION TEMPERATURE (C) 5 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320: 1.0 & 3.0 AMP MINICONVERTER LM2575 SEMTECH ayitcuinc REGULATORS LM2576 April 7, 1998 LM2575 - OPERATIONAL DATA EFFICIENCY 200 STANDBY QUIESCENT CURRENT VOUT=12V = a VIN=40V VON/VOFF=5V EFFICIENCY (%) 3 VIN=12V STANDBY QUIESCENT CURRENT (uA) 50 0 10 20 30 40 50 INPUT VOLTAGE (V) 75 -50 -25 0 25 50 75 100 125 150 JUNCTION TEMPERATURE (C) POWER DERATING VS. AMBIENT TEMPERATURE POWER DISSIPATION (WATTS) 55 = -25 0 25 50 75 100 125 150 AMBIENT TEMPERATURE (C) 6 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320| 1.0 & 3.0 AMP MINICONVERTER LM2575 SEMTECH SWITCHING REGULATORS LM2576 April 7, 1998 LM2576 - OPERATIONAL DATA FEEDBACK VOLTAGE VS. NORMALIZED FEEDBACK VOLTAGE DUTY CYCLE (ADJ. VERSION ONLY) VERSION ONL VIN=12V lo=500 mA NORMALIZED TO Tj = 25C lo = 500 mA VIN=40V VIN=7V NORMALIZED FEEDBACK VOLTAGE (mV) FEEDBACK VOLTAGE CHANGE (mV) 75 -50 -25 0 25 50 75 100 125 150 0 20 40 60 80 100 JUNCTION TEMPERATURE (C) DUTY CYCLE(%) SUPPLY CURRENT VS. DUTY CYCLE SUPPLY CURRENT MEASURED AT GROUND PIN =z = Tj= 25C = < VOUT=5V = x _ VIN=7V a x Ww w VIN=40V x 2 9 3 > _ > a a % a 2 5 ILOAD = 200mA wo 20 40 60 80 100 0 10 20 30 40 50 DUTY CYCLE (%) INPUT VOLTAGE (V) CURRENT LIMIT SWITCH SATURATION VOLTAGE 6.5 = z w 1.75 Ee < = 55 E a F415 Fd $ 23 z 1.25 KE VIN=25V 3 = z 4.5 < 4.0 E 2 = 3 Fe 0.75 wo 3.5 05 75-50 25 0 25 50 75 100 125 150 0.5 1.0 2.0 3.0 4.0 JUNCTION TEMPERATURE (C) SWITCH CURRENT (A) 7 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 913201.0 & 3.0 AMP MINICONVERTER LM2575 SEMTECH SWITCHING REGULATORS LM2576 April 7, 1998 LM2576 - OPERATIONAL DATA DROPOUT VOLTAGE MINIMUM OPERATING VOLTAGE 60 VOUT=1.23V > 50 a VOUT=3V = a L1=100uH Wao < = lo=3A 5 Ke Oo 3.0 2 > g Ek 7 2 20 z z > lo=200mA 41.0 0 75 50 25 0 25 50 75 100 125 150 75 50 25 O 25 50 75 100 125 150 JUNCTION TEMPERATURE (C) JUNCTION TEMPERATURE (C) FEEDBACK PIN CURRENT LINE REGULATION (ADJ. VERSION) 5 x O TO VIN=10V z o lo=500mA. 50 zt VOUT=5V E a Tj=25C z as WwW 25 we ow rn Li 3 ag eo Ne 5 a 3 < -25 <q Ss o z= a & WW 50 z ins - 75 0 10 20 30 40 50 75 -50 = -25 0 25 50 75 100 125 150 INPUT VOLTAGE (V) JUNCTION TEMPERATURE (C) OSCILLATOR FREQUENCY NORMALIZED AT 25C 6 NORMALIZED FREQUENCY (%) o 9 75 50 25 O 25 50 75 100 125 150 JUNCTION TEMPERATURE (C) 8 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320: 1.0 & 3.0 AMP MINICONVERTER LM2575 SEMTECH ayitcuinc REGULATORS LM2576 April 7, 1998 VOUT=12V EFFICIENCY (%) VOUT=3V LM2576 - OPERATIONAL DATA EFFICIENCY 00 STANDBY QUIESCENT CURRENT VIN=40V = a So VON/OFF=5V = S S VIN=12V STANDBY QUIESCENT CURRENT (uA) 50 20 30 40 50 INPUT VOLTAGE (V) 75 -50 -25 0 25 50 75 100 125 150 JUNCTION TEMPERATURE (C) POWER DERATING VS. CASE TEMPERATURE POWER DISSIPATION (WATTS) -75 = -50 -25 0 25 50 75 100 125 150 CASE TEMPERATURE (C) 9 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320SENMTECH Today's Resulcs .. Tomorrow's Vision 1.0 & 3.0 AMP MINICONVERTER SWITCHING REGULATORS LM2575 LM2576 April 7, 1998 TYPICAL APPLICATION - BUCK MODE FIXED VOLTAGE VIN + 1 1 FEEDBACK t LM2575 |LM2576 | [REG + L, | 330uH | 100uH 1 1 1 1 CIN | ON/OFF] | D, 3A TA ! tourpuT LI Cy | 68uF | 120uF ! Cour | 330UF | 1,000NF I ON/OFF GND Cout o-* oO Vo + 2 < Vin < RATED ADJUSTABLE VOLTAGE VIN + t FEEDBACK LM2575 | LM2576 . L, | 330uH | 100yH CIN ON/OFF, D, 3A TA outpuT L1 C, | 68uF | 120uF 1 RY 1 Cour | 330UF |1,000uF ON/OFF T___Gnp Court R2 2k o-4 Vo = 1.23 (1 + R1/R2) The above component selections will be adequate for most applications for output currents from 250mA to 3.0A (LM2576) or 150mA to 1.0A (LM2575). Applica- tions with V,,,; below 5V or above 24V may require component adjustment for maximum performance; please contact factory for application assistance. 1. DEVICE SELECTION. Select an appropriate device from the Ordering Information guide based upon voltage option and package. 2. THERMAL CONDITIONS. Most applications will not require a heatsink for the TO-220 package. Ap- proximate power dissipation is: V p = VoloVsar_ 9 02 Vy Nol IN IN 3. CATCH DIODE. If the output must be capable of a sustained short, the I- rating must be above 3A for the LM2575 and 7A for the LM2576. The use of an ultra fast diode with soft recovery characteristics or a Schottky will be adequate. The major impact on Schottky versus an ultra fast is efficiency. Schottkys will provide approximately 4% to 5% improvement for Vouts below 12V, whereas above 12V the difference will become less significant. Breakdown rating must be in excess of V,, for margin. 4. INPUT CAPACITOR. The value shown will be ade- quate for most applications. Ripple voltage at the switching frequency is caused by the input capacitor supplying load current during the on time of the power switch. The use of a low ESR switching type capacitor will minimize ripple to an acceptable level. 10 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 913201.0 & 3.0 AMP MINICONVERTER LM2575 SEMTECH SWITCHING REGULATORS LM2576 April 7, 1998 5. LAYOUT. Use short connections with a central point ground to prevent improper operation caused by stray inductance and ground loops. 6. OUTPUT CAPACITOR. Ripple voltage on V,,; is directly related to the value of C,,, and the internal resistance ESR of C,,;. Output noise can be lowered by increasing C,,,; or by selecting a capacitor with a lower ESR. ESR must be approximately 0.03Q for the LM2576 or 0.07Q for the LM2575, or above to main- tain stability, otherwise raise value of C.,,. 7. SWITCHING SPIKES. Switching spikes will also occur due to distributive capacitance across turns of the inductor when combined with output capacitor se- ries inductance (ESL). Reduction to a level at or below the switching ripple can be achieved by using a post filter as shown. SWITCHING SPIKE REDUCTION FEEDBACK LM257X OUTPUT L1 JuH+ VOUT DC INPUT + VIN GND 10uF + CIN TANT 11 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320SERATECH 1.0 & 3.0 AMP MINICONVERTER LM2575 Tday?s RerutsTomarnes Vinee SWITCHING REGULATORS LM2576 April 7, 1998 TYPICAL BUCK SHUTDOWN +UNREGULATED FEEDBACK DC INPUT +N +REGULATED oT LM257X OUTPUT L1 OUTPUT CIN Ny] +5V - shutdown = ON/OFF 9 _1_ON input OFF TTL, CMOS, ete. +UNREGULATED FEEDBACK DC INPUT + VIN +REGULATED LM257X OUTPUT L1 OUTPUT + 100K | ON /OFF GND CIN | . = D1 =C +5V -- OUT 9 _1-ON shutdown OFF input "100K 100K TURN-ON DELAY FEEDBACK +REGULATED +VINO LM257X OUTPUT L1 OUTPUT 4 +i O. our 3.0ur [ON/orr | GND + D1 _CouT 1iN914 Circuit allows for Cin provides CIN to be fully charged before startup, to supply hipeak current instead of input supply. 12 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320SENMTECH 1.0 & 3.0 AMP MINICONVERTER LM2575 tday/= Results Tomorrow's Vision SWITCHING REGULATORS LM2576 April 7, 1998 UNDER VOLTAGE LOCKOUT UNREGULATED DC INPUT +VIN meee +REGULATED O LM257X = |QUTPUT OUTPUT R1 +f Z1 - CoutT Q1 R2 1 Regulator will be off until a Vin set point is reached. Vin (ON) = Vz + 3VsE at TURN-ON DELAY WITH SPIKE FILTER FEEDBACK +REGULATED +VIN O if LM257X OUTPUT OUTPUT 0.47uF VV" _@ + ~~ to _L eo_/W_# - 2.2K Ao} =Cout 10K g ~~ 0.01uF O T e e t Spike filter reduces input noise, causing false triggering of delay. 13 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320SENMTECH Today's Resulcs .. Tomorrow's Vision 1.0 & 3.0 AMP MINICONVERTER SWITCHING REGULATORS LM2575 LM2576 April 7, 1998 TYPICAL APPLICATION - INVERTING BUCK/BOOST LM2575 |LM2576 Cy | 47HF | 100uF D1 3A TA L1 | 100uH | 68H Cour | 2,700UF | 6,800NF lour | 250mA | 500mA LM2575 |LM2576 Cy | 47HF | 100uF D1 3A TA L1 | 100uH | 68H Cour | 470UF | 2,700NF lour | 100mA | 750mMA +5V 1 + CIN +5V to 5V t Mol + Vin <Vin RATED -L +12V 1 : [REG CIN ON/OFF 5 0 +12V to 5V COMMON Mol + Vin <Vin RATED Inverting buck/boost operation is a different topology of operation than buck. This difference reduces the output current capability of the device, in that the in- ductor must supply all of the load current during the time the power switch is off. Maximum output current is approximately: lout * 35 (LM2576) V. 2 14 Nol o| Vin 13 (LM2575) Component stress requirement is very similar to the buck with a few exceptions: e catch diode breakdown V,, must be greater than Vin + [Vourl e input capacitor is larger due to the increased peak current during switch turn on. Power dissipation is approximately: Ps -| [Yo| \Vo| [Vol IN IN Please contact factory for additional assistance when using the buck/boost topology. 14 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 913201.0 & 3.0 AMP MINICONVERTER LM2575 SEMTECH SWITCHING REGULATORS LM2576 April 7, 1998 INVERTING BUCK/BOOST SHUTDOWN +UNREGULATED FEEDBACK DC INPUT LM257X OUTPUT LI ON/OFF CouT ron ~~ [_ON shutdown OFF input 470K REGULATED OUTPUT +UNREGULATED FEEDBACK DC INPUT oO T LM257X OUTPUT LI +5V O LT GNP CoutT +5V -- [ON shutdown 0 input OFF REGULATED OUTPUT 15 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 913201.0 & 3.0 AMP MINICONVERTER LM2575 SEMTECH SWITCHING REGULATORS LM2576 April 7, 1998 SUPPORT COMPONENTS INFORMATION PRE-WOUND INDUCTORS: Hurricane Electronics Lab P.O. Box 1280 Hurricane Industrial Park Hurricane, UT 84737 (801) 635-2003 CORE SOURCE: Micro Metals, Inc. 1190 N. Hawk Circle Anaheim, CA 92807 (714) 630-7420 CAPACITORS: VPR Series Mallory Capacitor Co. 4760 Kentucky Avenue Indianapolis, IN 46241 (317) 856-3731 511D & 673 Series Sprague Electric Co. North Adams, MA (413) 664-4411 HFQ, HFZ Series Panasonic Industrial Co. 2 Panasonic Way Secaucus, NJ 07094 (201) 392-6142 PF, PL Series Nichicon Corp. 927 E. State Pkwy. Schaumburg, IL 60195 (708) 843-7600 LXF Series United Chemi-con 9801 West Higgins Road Rosemont, IL 60018 (708) 696-2000 HEAT SINKS: AAVID Engineering Co. P.O.Box 400 One Kool Path Laconia, NH 03247 (603) 528-3400 Thermalloy, Inc. 2021 W. Valley View Lane Dallas, TX 76381 (214) 243-4321 DIODES - CATCH: Ultra Fast/Soft Recovery Semtech Corporation 652 Mitchell Road Newbury Park, CA 91320 (805) 498-2111 DIODES - SCHOTTKY: Fuji/Collmer Semiconductor 14368 Proton Road Dallas, TX 76244 (800) 527-0521 Micro Quality 1000 N. Shiloh Garland, TX 76046 (214) 272-7811 16 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 913201.0 & 3.0 AMP MINICONVERTER LM2575 SEMTECH SWITCHING REGULATORS LM2576 April 7, 1998 OUTLINE - TO-220 (T-XX Option) J ~ Bo ee a L D QT A } NN v-f_F 4 +|--M H Hrs i JEDEC TO220 O OUTLINE - TO-220 (T-XX-H Option) Jp =| Boe k= IPP rf + Ta P L | NN ox = (ere M- Qe La G = R= | F = JEDEC TO220 (BODY ONLY) OUTLINE - TO-220 (T-XX-V Option) | J wl Be PT f Riek PRE \ L pg eel Tl eth WEEE TEP eS | JEDEC TO220 (BODY ONLY) 17 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 913201.0 & 3.0 AMP MINICONVERTER LM2575 SEMTECH SWITCHING REGULATORS LM2576 April 7, 1998 OUTLINE - TO-263 alae pe 0 PIN CONFIGURATIONS C) ie LM2575, LM2576 PIN | FUNCTION Vin 1 2 2 OUTPUT | 25 4 5 3 COMMON 4 | | | | | FEEDBACK 5 ON/OFF TO-263 TAB IS COMMON a) TS T oO -220 18 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320