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LM2576 Dataheets PDF



Part Number LM2576
Manufacturers Semtech Corporation
Logo Semtech Corporation
Description 1A & 3A Miniconverter Switching Regulators
Datasheet LM2576 DatasheetLM2576 Datasheet (PDF)

POWER MANAGEMENT Description The LM2575/6 series switching regulators are monolithic 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. 1A & 3A Miniconverter Switching Regulators Features u Pin for pin replacement for Nationa.

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POWER MANAGEMENT Description The LM2575/6 series switching regulators are monolithic 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. 1A & 3A Miniconverter Switching Regulators Features u Pin for pin replacement for National’s LM2575/6 u DC-to-DC buck or buck/boost converter requiring only 4 support components Fixed or adjustable voltages Preset output voltages of 3.3V, 5V and 12V Wide output voltage range, 1.23V to 35V 82% typical efficiency @ 5V out Wide input voltage range, 4V to 40V Inhibit/enable control pin Industrial temperature range TO-220 and TO-263 packages series LM2575 & LM2576 u u u u The LM2575/6 series miniconverters include a u switching regulator and compensation network all within u the same package. Just add a choke, catch diode and u two capacitors to obtain an efficient DC-to-DC converter. u The current limit and thermal shutdown features of the LM2575/6 series fully protect the device against overstress conditions. Applications u u u u Micro controller power supplies Medical equipment Industrial power supplies Instrumentation power supplies 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. Typical Application Circuits LM2575 L1 D1 C IN C OUT 330µH 3A 68µF 330µF LM2576 100µH 7A 120µF 1,000µF Revision 1, January 2001 1 www.semtech.com LM2575 & LM2576 POWER MANAGEMENT Absolute Maximum Ratings Parameter Input Voltage On/Off Pi n Input Voltage Output Voltage to C ommon (Steady State) Power D i ssi pati on Thermal Resi stance Juncti on to Ambi ent TO-220 TO-263 Thermal Resi stance Juncti on to C ase TO-220 TO-263 Operati ng Juncti on Temperature Range Storage Temperature Range Lead Temperature (Solderi ng) 10 Sec. ESD Rati ng (Human Body Model) PD q JA Sy mbol VIN VON/OFF Maximum 45 -0.3 £ VON/OFF £ VIN -1 Internally Li mi ted 55 60 2.0 2.0 -40 to +125 -65 to +150 300 2 U nits V V V W °C /W q JC TJ TSTG TLEAD V ESD °C /W °C °C °C kV Electrical Characteristics Unless otherwise specified: VIN = 12V for 3.3V, 5V and ADJ options and 25V for 12V option; VOUT = 5V for ADJ option; TA = 25ºC; VIN rated = 40V; IO = 0.5 to 3A (LM2576), 0.2 to 1A (LM2575). Values in bold apply over full operating temperature range. Parameter Output Voltage LM2576-3.3 Sy mbol VO Test C onditions IO = 0.5A 8V to VIN Rated Min 3.23 3.20 3.14 Ty p 3.30 Max 3.37 3.40 3.47 U nits V Output Voltage LM2576-5 VO IO = 0.5A 8V to VIN Rated 4.90 4.85 4.75 5.00 5.10 5.15 5.25 V Output Voltage LM2576-12 VO IO = 0.5A 15V to VIN Rated 11.76 11.52 11.40 12.00 12.24 12.48 12.60 V Feedback Voltage LM2576-AD J, VO = 5V V FB IO = 0.5A 8V to VIN Rated 1.217 1.193 1.180 1.230 1.243 1.267 1.280 V Feedback Bi as C urrent LM2576-AD J ã 2001 Semtech Corp. IB VIN = 12V, IO = 0.5A 50 100 500 nA 2 www.semtech.com LM2575 & LM2576 POWER MANAGEMENT Electrical Characteristics (Cont.) Unless otherwise specified: VIN = 12V for 3.3V, 5V and ADJ options and 25V for 12V option; VOUT = 5V for ADJ option; TA = 25ºC; VIN rated = 40V; IO = 0.5 to 3A (LM2576), 0.2 to 1A (LM2575). Values in bold apply over full operating temperature range. Parameter Output Voltage LM2575-3.3 Sy mbol VO Test C onditions IO = 0.2A 8V to VIN Rated Min 3.23 3.20 3.14 Ty p 3.30 Max 3.37 3.40 3.47 U nits V Output Voltage LM2575-5 VO IO = 0.2A 8V to VIN Rated 4.90 4.85 4.75 5.00 5.10 5.15 5.25 V Output Voltage LM2575-12 VO IO = 0.2A 15V to VIN Rated 11.76 11.52 11.40 12.00 12.24 12.48 12.60 V Feedback Voltage LM2575-AD J, VO = 5V V FB IO = 0.2A 8V to VIN Rated 1.217 1.193 1.180 1.230 1.243 1.267 1.280 V Feedback Bi as C urrent LM2575-AD J Effi ci ency/Opti on 3.3V 5V 12V A D J, V O = 5 V Swi tchi ng Frequency IB VIN = 12V, IO = 0.2A 50 100 500 nA h VIN = 12V, IO = 1A (LM2575, 3A for LM2576) 77 82 % VIN = 15V, IO = 1A (LM2575, 3A for LM2576) VIN = 12V, IO = 1A (LM2575, 3A for LM2576) fSX 47 43 88 82 52 58 62 0.9 0.9 93 1.7 1.3 98 2.2 3.0 3.2 5.8 6.9 7.5 A 1.2 1.4 % A V kHz Saturati on Voltage(1) VSAT LM2575, IO = 1A LM2576, IO = 3A Max. D uty C ycle (On)(3) Peak C urrent LM2575(1) DC ICL Peak C urrent LM2576(1) ICL 4.2 3.5 ã 2001 Semtech Corp. 3 www.semtech.com LM2575 & LM2576 POWER MANAGEMENT Electrical Characteristics (Cont.) Unless otherwise specified: VIN = 12V for 3.3V, 5V and ADJ options and 25V for 12V option; VOUT = 5V for ADJ option; TA = 25ºC; VIN rated = 40V; IO = 0.5 to 3A (LM2576), 0.2 to 1A (LM2575). Values in bold apply over full operating temperature range. Parameter Output Leakage C urrent(2) Output = 0V Output = -1V Qui escent C urrent(2) Sy mbol Test.


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