Miniconverter Switching Regulators replacement Nationals LM2575/6
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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
Miniconverter Switching Regulators
replacement Nationals LM2575/6 DC-to-DC buck buck/boost converter requiring
only support components Fixed adjustable voltages Preset output voltages 3.3V, Wide output voltage range, 1.23V typical efficiency Wide input voltage range, Inhibit/enable control Industrial temperature range TO-220 TO-263 packages series
LM2575 LM2576
LM2575/6 series miniconverters include switching regulator compensation network within same package. Just choke, catch diode capacitors obtain efficient DC-to-DC converter.
current limit thermal shutdown features LM2575/6 series fully protect device against overstress conditions.
Applications
Micro controller power supplies Medical equipment Industrial power supplies Instrumentation power supplies
LM2575/6 series offers alternative popular terminal linear regulators providing higher efficiency with reduced heatsink size. many applications heat sink will required.
Typical Application Circuits
LM2575 330µH 68µF 330µF
LM2576 100µH 120µF 1,000µF
Revision January 2001
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LM2575 LM2576
POWER MANAGEMENT Absolute Maximum Ratings
Parameter Input Voltage On/Off Input Voltage Output Voltage ommon (Steady State) Power pati Thermal Resi stance Juncti Ambi TO-220 TO-263 Thermal Resi stance Juncti TO-220 TO-263 Operati Juncti Temperature Range Storage Temperature Range Lead Temperature (Solderi Sec. Rati (Human Body Model) mbol VON/OFF Maximum -0.3 VON/OFF Internally +125 +150 nits
TSTG TLEAD
Electrical Characteristics
Unless otherwise specified: 3.3V, options option; VOUT option; rated 40V; (LM2576), (LM2575). Values bold apply over full operating temperature range.
Parameter Output Voltage LM2576-3.3
mbol
Test onditions 0.5A Rated
3.23 3.20 3.14
3.30
3.37 3.40 3.47
nits
Output Voltage LM2576-5
0.5A Rated
4.90 4.85 4.75
5.00
5.10 5.15 5.25
Output Voltage LM2576-12
0.5A Rated
11.76 11.52 11.40
12.00
12.24 12.48 12.60
Feedback Voltage LM2576-AD
0.5A Rated
1.217 1.193 1.180
1.230
1.243 1.267 1.280
Feedback urrent LM2576-AD
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12V, 0.5A
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LM2575 LM2576
POWER MANAGEMENT Electrical Characteristics (Cont.)
Unless otherwise specified: 3.3V, options option; VOUT option; rated 40V; (LM2576), (LM2575). Values bold apply over full operating temperature range.
Parameter Output Voltage LM2575-3.3
mbol
Test onditions 0.2A Rated
3.23 3.20 3.14
3.30
3.37 3.40 3.47
nits
Output Voltage LM2575-5
0.2A Rated
4.90 4.85 4.75
5.00
5.10 5.15 5.25
Output Voltage LM2575-12
0.2A Rated
11.76 11.52 11.40
12.00
12.24 12.48 12.60
Feedback Voltage LM2575-AD
0.2A Rated
1.217 1.193 1.180
1.230
1.243 1.267 1.280
Feedback urrent LM2575-AD Effi ency/Opti 3.3V tchi Frequency
12V, 0.2A
12V, (LM2575, LM2576)
15V, (LM2575, LM2576) 12V, (LM2575, LM2576)
Saturati Voltage(1)
VSAT
LM2575, LM2576,
Max. ycle (On)(3) Peak urrent LM2575(1)
Peak urrent LM2576(1)
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LM2575 LM2576
POWER MANAGEMENT Electrical Characteristics (Cont.)
Unless otherwise specified: 3.3V, options option; VOUT option; rated 40V; (LM2576), (LM2575). Values bold apply over full operating temperature range.
Parameter Output Leakage urrent(2) Output Output escent urrent(2)
mbol
Test onditions
nits
Rated
Standby escent urrent (On/Off On/Off Logi Input Level
ISTBY
On/Off Input urrent
VON/OFF (Off) VON/OFF (On)
Notes: Output sourcing current, resistive load, inductor capacitor. Feedback 1.0V. Feedback
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LM2575 LM2576
POWER MANAGEMENT Configurations Ordering Information
ice(1) LM2575T-XX LM2575S-XX.TR LM2576T-XX LM2576S-XX.TR ackag TO-220-5(2)(3) TO-263-5(4) TO-220-5(2)(3) TO-263-5(4) urrent
TO-263-5
LM2575, LM2576 Function OUTPUT OMMON ON/OFF
TO-220-5
Notes: Voltage Option. Available voltages 3.3V (-3.3), (-5.0), (-12), (-ADJ), which adjustable between 1.23V 35V. Lead bend options TO-220-5 are: T-XX Straight in-line; T-XX-V Vertical Staggered; T-XX-H Horizontal Staggered. Please refer outline drawings this datasheet. Only available tube packaging. tube contains devices. Only available tape reel packaging. reel contains devices.
OMMON
Block Diagram
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LM2575 LM2576
POWER MANAGEMENT Typical Characteristics LM2575
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LM2575 LM2576
POWER MANAGEMENT Typical Characteristics LM2575 (Cont.)
2001 Semtech Corp.
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LM2575 LM2576
POWER MANAGEMENT Typical Characteristics LM2575 (Cont.)
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LM2575 LM2576
POWER MANAGEMENT Typical Characteristics LM2576
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LM2575 LM2576
POWER MANAGEMENT Typical Characteristics LM2576 (Cont.)
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LM2575 LM2576
POWER MANAGEMENT Typical Characteristics LM2576 (Cont.)
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LM2575 LM2576
POWER MANAGEMENT Applications Information Buck Mode
LM2575 330µH 68µF 330µF
LM2576 100µH 120µF 1,000µF
above component selections will adequate most applications output currents from 250mA (LM2576) 150mA (LM2575). Applications with 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
VSAT
Schottky versus ultra fast diode 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. 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 minimum 0.03W LM2576 0.07W LM2575 maintain stability, otherwise raise value COUT.
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Catch Diode. output must capable sustained short, rating must above LM2575 LM2576. ultra fast diode with soft recovery characteristics Schottky will adequate. major impact selection
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LM2575 LM2576
POWER MANAGEMENT Applications Information (Cont.)
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 below. Switching Spike Reduction
Typical Buck Shutdown
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LM2575 LM2576
POWER MANAGEMENT Applications Information (Cont.)
Turn-On Delay
Under Voltage Lockout
Turn-On Delay With Spike Filter
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LM2575 LM2576
POWER MANAGEMENT Applications Information Inverting Buck/Boost
LM2575 IOUT 47µF 100µH 2,700µF 250mA
LM2576 100µF 68µH 6,800µF 500mA
LM2575 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
Component stress requirements very similar buck with exceptions: catch diode breakdown must greater than |VOUT| input capacitor larger increased peak current during switch turn Power dissipation approximately:
2576
IOUT
2575
Please contact factory additional assistance when using buck/boost topology.
2001 Semtech Corp.
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LM2575 LM2576
POWER MANAGEMENT Applications Information (Cont.)
Inverting Buck/Boost Shutdown
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LM2575 LM2576
POWER MANAGEMENT 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
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LM2575 LM2576
POWER MANAGEMENT Outline Drawing TO-220-5 (T-XX Option)
Outline Drawing TO-220-5 (T-XX-H Option)
Outline Drawing TO-220-5 (T-XX-V Option)
2001 Semtech Corp.
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LM2575 LM2576
POWER MANAGEMENT Outline Drawing TO-263-5
Minimum Land Pattern TO-263-5
Contact Information
Semtech Corporation Power Management Products Division Mitchell Rd., Newbury Park, 91320 Phone: (805)498-2111 (805)498-3804
2001 Semtech Corp.
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