LM2575 LM2576 DESCRIPTION LM2575/6 series switching regulato
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MINICONVERTER SWITCHING REGULATORS
LM2575 LM2576
DESCRIPTION
LM2575/6 series switching regulators monolithic integrated circuits designed "buck" "buck/boost" regulator applications requiring accurate output voltages over combined variations line, load temperature. This unique series greatly simplifies switching power supply design. LM2575 maximum output current LM2576 rated LM2575/6 series miniconverters include switching regulator compensation network within same package. Just choke, catch diode capacitors obtain efficient DC-toDC converter. Current limit thermal shutdown features LM2575/6 series fully protect device against overstress conditions. LM2575/6 series offers alternative popular terminal linear regulators providing higher efficiency with reduced heatsink size. many applications heat sink will required.
FEATURES interchangeable with National's
LM2575/LM2576 series DC-to-DC buck buck/boost converter requiring only support components Fixed adjustable voltages Preset output voltages 3.3, Wide output voltage range, 1.23 typical efficiency Wide input voltage range, Inhibit/enable control
ABSOLUTE MAXIMUM RATINGS
Parameter Input Voltage On/Off Input Voltage Output Voltage Common (Steady State) Power Dissipation Thermal Resistance Junction Case TO-220 TO-263 Thermal Resistance Junction Ambient TO-220 TO-263 Symbol Maximum -0.3VVIN Internally Limited Units
BLOCK DIAGRAM
°C/W
ORDERING INFORMATION
DEVICE
TSTG TLEAD
°C/W
PACKAGE TO-220
CURRENT
LM2575T-XX LM2575S-XX LM2576T-XX LM2576S-XX
Operating Junction Temperature Range Storage Temperature Range
TO-263 TO-220
TO-263
Lead Temperature (Soldering) Class
Notes: Voltage Option 3.3, 5.0, (1.23V 35V). T-XX Straight in-line; T-XX-V Vertical Staggered; T-XX-H Horizontal Staggered. suffix `TR' tape reel (TO-263).
1998 SEMTECH CORP. MITCHELL ROAD NEWBURY PARK 91320
MINICONVERTER SWITCHING REGULATORS
LM2575 LM2576
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, 3.3V, options; 12V; VOUT ADJ, rated 40V; (LM2576), (LM2575). Test Conditions Parameter Output Voltage LM2576-3.3 Symbol Rated LM2576-5 Rated LM2576-12 Rated Feedback Voltage VOUT LM2576-ADJ Feedback Bias Current LM2576-ADJ Output Voltage LM2575-3.3 Rated LM2575-5 Rated LM2575-12 Rated Feedback Voltage VOUT LM2575-ADJ Feedback Bias Current LM2575-ADJ Rated 0.2A O.T. 0.2A O.T. 0.2A O.T. 0.2A O.T. 0.2A O.T. Rated 0.5A O.T. 3.23 3.14 3.20 4.90 4.75 4.85 11.76 11.40 11.52 1.217 1.180 1.193 3.30 3.30 3.30 5.00 5.00 5.00 12.00 12.00 12.00 1.230 1.230 1.230 0.5A O.T. 0.5A O.T. 0.5A O.T. 0.5A O.T.
Test Limits 3.23 3.14 3.20 4.90 4.76 4.85 11.76 11.40 11.52 1.217 1.180 1.193 3.30 3.30 3.30 5.00 5.00 5.00 12.00 12.00 12.00 1.230 1.230 1.230 3.37 3.47 3.40 5.10 5.25 5.15 12.24 12.60 12.48 1.243 1.280 1.267 3.37 3.47 3.40 5.10 5.25 5.15 12.24 12.60 12.48 1.243 1.280 1.267 Units
(CONTINUED NEXT PAGE) 1998 SEMTECH CORP. MITCHELL ROAD NEWBURY PARK 91320
MINICONVERTER SWITCHING REGULATORS
LM2575 LM2576
ELECTRICAL CHARACTERISTICS (cont.)
Test Conditions Parameter Efficiency/Option Switching Frequency
Test Limits
Symbol
LM2575-1A LM2576-3A
Units
O.T. O.T. O.T.
VSAT
Saturation Voltage
LM2575-1A LM2576-3A
O.T. O.T.
Duty Cycle (On) Current Limit
Peak Current LM2576 Peak Current LM2575
Output Leakage Current Output Output Quiescent Current
RATED O.T.
O.T.
Standby Quiescent Current (On/Off On/Off Logic Input Level VOUT VOUT Option On/Off Input Current On/Off (Off) On/Off (On)
ISTBY
O.T. O.T.
0.5A 0.5A
NOTES: Output sourcing current-resistive load, inductor capacitor. Feedback 1.0V. Feedback Over Temp. (O.T.) over specified operating junction temperature range. 1998 SEMTECH CORP. MITCHELL ROAD NEWBURY PARK 91320
MINICONVERTER SWITCHING REGULATORS
LM2575 LM2576
LM2575 OPERATIONAL DATA
1998 SEMTECH CORP. MITCHELL ROAD NEWBURY PARK 91320
MINICONVERTER SWITCHING REGULATORS
LM2575 LM2576
LM2575 OPERATIONAL DATA
1998 SEMTECH CORP. MITCHELL ROAD NEWBURY PARK 91320
MINICONVERTER SWITCHING REGULATORS
LM2575 LM2576
LM2575 OPERATIONAL DATA
1998 SEMTECH CORP. MITCHELL ROAD NEWBURY PARK 91320
MINICONVERTER SWITCHING REGULATORS
LM2575 LM2576
LM2576 OPERATIONAL DATA
1998 SEMTECH CORP. MITCHELL ROAD NEWBURY PARK 91320
MINICONVERTER SWITCHING REGULATORS
LM2575 LM2576
LM2576 OPERATIONAL DATA
1998 SEMTECH CORP. MITCHELL ROAD NEWBURY PARK 91320
MINICONVERTER SWITCHING REGULATORS
LM2575 LM2576
LM2576 OPERATIONAL DATA
1998 SEMTECH CORP. MITCHELL ROAD NEWBURY PARK 91320
MINICONVERTER SWITCHING REGULATORS
LM2575 LM2576
TYPICAL APPLICATION BUCK MODE
LM2575 LM2576 COUT 330µH 68µF 330µF 100µH 120µF 1,000µF
LM2575 LM2576 COUT 330µH 68µF 330µF 100µH 120µF 1,000µF
above component selections will adequate most applications output currents from 250mA 3.0A (LM2576) 150mA 1.0A (LM2575). Applications with VOUT below above require component adjustment maximum performance; please contact factory application assistance. DEVICE SELECTION. Select appropriate device from "Ordering Information" guide based upon voltage option package. THERMAL CONDITIONS. Most applications will require heatsink TO-220 package. Approximate power dissipation
VOIO VSAT
CATCH DIODE. output must capable sustained short, rating must above LM2575 LM2576. ultra fast diode with soft recovery characteristics Schottky will adequate. major impact Schottky versus ultra fast efficiency. Schottkys will provide approximately improvement VOUTS below 12V, whereas above difference will become less significant. Breakdown rating must excess margin. INPUT CAPACITOR. value shown will adequate most applications. Ripple voltage switching frequency caused input capacitor supplying load current during time power switch. switching type capacitor will minimize ripple acceptable level.
1998 SEMTECH CORP. MITCHELL ROAD NEWBURY PARK 91320
MINICONVERTER SWITCHING REGULATORS
April 1998 LAYOUT. short connections with central point ground prevent improper operation caused stray inductance ground loops. OUTPUT CAPACITOR. Ripple voltage VOUT directly related value COUT internal resistance COUT. Output noise lowered increasing COUT selecting capacitor with lower ESR. must approximately 0.03 LM2576 0.07 LM2575, above maintain stability, otherwise raise value COUT. SWITCHING SPIKES. Switching spikes will also occur distributive capacitance across turns inductor when combined with output capacitor series inductance (ESL). Reduction level below switching ripple achieved using post filter shown.
LM2575 LM2576
SWITCHING SPIKE REDUCTION
1998 SEMTECH CORP. MITCHELL ROAD NEWBURY PARK 91320
MINICONVERTER SWITCHING REGULATORS
LM2575 LM2576
TYPICAL BUCK SHUTDOWN
TURN-ON DELAY
1998 SEMTECH CORP. MITCHELL ROAD NEWBURY PARK 91320
MINICONVERTER SWITCHING REGULATORS
LM2575 LM2576
UNDER VOLTAGE LOCKOUT
TURN-ON DELAY WITH SPIKE FILTER
1998 SEMTECH CORP. MITCHELL ROAD NEWBURY PARK 91320
MINICONVERTER SWITCHING REGULATORS
LM2575 LM2576
TYPICAL APPLICATION INVERTING BUCK/BOOST
LM2575 COUT IOUT 47µF 100µH
LM2576 100µF 68µH
2,700µF 6,800µF 250mA 500mA
LM2575 COUT IOUT 47µF 100µH 470µF 100mA
LM2576 100µF 68µH 2,700µF 750mA
Inverting buck/boost operation different topology operation than buck. This difference reduces output current capability device, that inductor must supply load current during time power switch off. Maximum output current approximately:
IOUT (LM2576
Component stress requirement very similar buck with exceptions:
catch diode breakdown must greater than |VOUT| input capacitor larger increased peak current during switch turn Power dissipation approximately:
VSAT
IOUT
(LM2575
Please contact factory additional assistance when using buck/boost topology.
1998 SEMTECH CORP. MITCHELL ROAD NEWBURY PARK 91320
MINICONVERTER SWITCHING REGULATORS
LM2575 LM2576
INVERTING BUCK/BOOST SHUTDOWN
1998 SEMTECH CORP. MITCHELL ROAD NEWBURY PARK 91320
MINICONVERTER SWITCHING REGULATORS
LM2575 LM2576
SUPPORT COMPONENTS INFORMATION
PRE-WOUND INDUCTORS: Hurricane Electronics P.O. 1280 Hurricane Industrial Park Hurricane, 84737 (801) 635-2003 CORE SOURCE: Micro Metals, Inc. 1190 Hawk Circle Anaheim, 92807 (714) 630-7420 CAPACITORS: Series Mallory Capacitor 4760 Kentucky Avenue Indianapolis, 46241 (317) 856-3731 511D Series Sprague Electric North Adams, (413) 664-4411 HFQ, Series Panasonic Industrial Panasonic Secaucus, 07094 (201) 392-6142 Series Nichicon Corp. State Pkwy. Schaumburg, 60195 (708) 843-7600
Series United Chemi-con 9801 West Higgins Road Rosemont, 60018 (708) 696-2000 HEAT SINKS: AAVID Engineering P.O.Box Kool Path Laconia, 03247 (603) 528-3400 Thermalloy, Inc. 2021 Valley View Lane Dallas, 76381 (214) 243-4321 DIODES CATCH: Ultra Fast/Soft Recovery Semtech Corporation Mitchell Road Newbury Park, 91320 (805) 498-2111 DIODES SCHOTTKY: Fuji/Collmer Semiconductor 14368 Proton Road Dallas, 76244 (800) 527-0521 Micro Quality 1000 Shiloh Garland, 76046 (214) 272-7811
1998 SEMTECH CORP. MITCHELL ROAD NEWBURY PARK 91320
MINICONVERTER SWITCHING REGULATORS
LM2575 LM2576
OUTLINE TO-220 (T-XX Option)
OUTLINE TO-220 (T-XX-H Option)
OUTLINE TO-220 (T-XX-V Option)
1998 SEMTECH CORP. MITCHELL ROAD NEWBURY PARK 91320
MINICONVERTER SWITCHING REGULATORS
LM2575 LM2576
OUTLINE TO-263
CONFIGURATIONS
LM2575, LM2576 TO-263 TO-220 FUNCTION OUTPUT COMMON FEEDBACK ON/OFF
COMMON
1998 SEMTECH CORP. MITCHELL ROAD NEWBURY PARK 91320
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