LM2576S-3.3

LM2575 & LM2576 1A & 3A Miniconverter Switching Regulators Description Features 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. u Pin for pin replacement for National’s LM2575/6 series u DC-to-DC buck or buck/boost converter requiring 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 The LM2575/6 series offers an alternative to popular 3 u terminal linear regulators by providing higher efficiency u with reduced heatsink size. In many applications a heat sink will not be required. 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 Micro controller power supplies Medical equipment Industrial power supplies Instrumentation power supplies Typical Application Circuits www.slkormicro.com 1 LM2575 LM2576 L1 330µH 100µH D1 3A 7A C IN 68µF 120µF C OUT 330µF 1,000µF LM2575 & LM2576 Absolute Maximum Ratings Parameter Sy mbol Maximum U nits VIN 45 V VON/OFF -0.3 £ VON/OFF £ VIN V -1 V Input Voltage On/Off Pi n Input Voltage Output Voltage to C ommon (Steady State) Power D i ssi pati on PD Internally Li mi ted W Thermal Resi stance Juncti on to Ambi ent TO-220 TO-263 q JA 55 60 °C /W Thermal Resi stance Juncti on to C ase TO-220 TO-263 q JC 2.0 2.0 °C /W Operati ng Juncti on Temperature Range TJ -40 to +125 °C Storage Temperature Range TSTG -65 to +150 °C Lead Temperature (Solderi ng) 10 Sec. TLEAD 300 °C ESD Rati ng (Human Body Model) V ESD 2 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 Sy mbol Test C onditions Min Ty p Max U nits VO IO = 0.5A 3.23 3.30 3.37 V 8V to VIN Rated 3.20 3.40 3.14 3.47 LM2576-3.3 Output Voltage VO LM2576-5 Output Voltage VO LM2576-12 Feedback Voltage 8V to VIN Rated 4.85 5.15 4.75 5.25 12.00 5.10 15V to VIN Rated 11.52 12.48 11.40 12.60 1.230 12.24 IO = 0.5A 1.217 8V to VIN Rated 1.193 1.267 1.180 1.280 VIN = 12V, IO = 0.5A LM2576-AD J www.slkormicro.com 5.00 11.76 V FB IB 4.90 IO = 0.5A LM2576-AD J, VO = 5V Feedback Bi as C urrent IO = 0.5A 50 1.243 100 500 2 V V V nA LM2575 & LM2576 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 Sy mbol Test C onditions Min Ty p Max U nits VO IO = 0.2A 3.23 3.30 3.37 V 8V to VIN Rated 3.20 3.40 3.14 3.47 LM2575-3.3 Output Voltage VO LM2575-5 Output Voltage 8V to VIN Rated 4.85 5.15 4.75 5.25 IB 5.00 12.00 5.10 IO = 0.2A 11.76 15V to VIN Rated 11.52 12.48 11.40 12.60 V FB LM2575-AD J, VO = 5V Feedback Bi as C urrent 4.90 VO LM2575-12 Feedback Voltage IO = 0.2A IO = 0.2A 1.217 8V to VIN Rated 1.193 1.267 1.180 1.280 VIN = 12V, IO = 0.2A 1.230 12.24 50 LM2575-AD J 1.243 100 V V V nA 500 Effi ci ency/Opti on 3.3V h VIN = 12V, IO = 1A (LM2575, 3A for LM2576) 77 5V 82 12V VIN = 15V, IO = 1A (LM2575, 3A for LM2576) 88 A D J, V O = 5 V VIN = 12V, IO = 1A (LM2575, 3A for LM2576) 82 Swi tchi ng Frequency fSX 47 52 43 Saturati on Voltage(1) VSAT LM2575, IO = 1A 0.9 1.2 LM2576, IO = 3A 0.9 1.4 DC 93 98 Peak C urrent LM2575(1) ICL 1.7 2.2 1.3 ICL 4.2 3.5 www.slkormicro.com 58 3 kHz 62 Max. D uty C ycle (On)(3) Peak C urrent LM2576(1) % V % 3.0 A 3.2 5.8 6.9 7.5 A LM2575 & LM2576 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 Sy mbol Test C onditions IL VIN = VIN Rated Min Ty p Max U nits 2 mA Output Leakage C urrent(2) Output = 0V Output = -1V Qui escent C urrent(2) IQ 7.5 30 5 10 mA 12 Standby Qui escent C urrent ISTBY 50 (On/Off Pi n = 5V) On/Off Pi n Logi c Input Level µA 500 2.2 VIH 1.4 V 2.4 1.2 VIL 1.0 V 0.8 On/Off Pi n Input C urrent IIH VON/OFF = 5V (Off) 12 30 IIL VON/OFF = 0V (On) 0 10 Notes: (1) Output sourcing current, resistive load, no inductor or capacitor. (2) Feedback = VO + 1.0V. (3) Feedback = 0V. www.slkormicro.com 4 µA LM2575 & LM2576 Pin Configurations Ordering Information (1) -XX = Voltage Option. Available voltages are 3.3V (-3.3), 5V (-5.0), 12V (-12), and ADJ (-ADJ), which is adjustable between 1.23V and 35V. . . TO-263-5 LM2575, LM2576 TO-220-5 Pin Function 1 VIN 2 OUTPUT 3 C OMMON 4 FE E D B A C K 5 ON/OFF TAB i s C OMMON Block Diagram www.slkormicro.com 5 LM2575 & LM2576 Typical Characteristics - LM2575 www.slkormicro.com 6 LM2575 & LM2576 Typical Characteristics - LM2575 (Cont.) www.slkormicro.com 7 LM2575 & LM2576 Typical Characteristics - LM2575 (Cont.) www.slkormicro.com 8 8 LM2575 & LM2576 Typical Characteristics - LM2576 www.slkormicro.com 9 LM2575 & LM2576 Typical Characteristics - LM2576 (Cont.) www.slkormicro.com 10 LM2575 & LM2576 Typical Characteristics - LM2576 (Cont.) www.slkormicro.com 11 LM2575 & LM2576 Outline Drawing - TO-220-5 Outline Drawing - TO-263-5 Minimum Land Pattern - TO-263-5 www.slkormicro.com 12