LM2576S-ADJ-MS

www.msksemi.com LM2576XX-MS/LM2576HVXX-MS Semiconductor Applications Features • • • • • • • • • • • Compiance • • • • 3.3V, 5V, 12V, 15V, and adjustable output versions Adjustable version output voltage range 1.23V to 37V (57V for HV version) ± 4% max over line and load conditions Guaranteed 3A output current Wide input voltage range, 40V up to57V for HV version Requires only 4 external components 52 kHz fixed frequency oscillator TTL shutdown capability, low power standbymode High efficiency Uses readily available standard inductors Thermal shutdown and current limit protection Simple high-efficiency step-down (buck)regulator Efficient pre-regulator for linear regulators On-card switching regulators Positive to negative converter (Buck-Boost) Typical application Figure 1.(Fixed Output Voltage Versions) 7V - 40V (57V for HV) UNREGULATED DC INPUT LM2576/ FEEDBACK LM2576HV - 4 L1 OUTPUT 5.0 +VIN 1 + GND 2 3 5 ON/OFF 100 H D1 CIN + COUT 1000 +5V REGULATED OUTPUT 3A Package Types TO220B-5L TO220-5L TO263-5 www.msksemi.com LM2576XX-MS/LM2576HVXX-MS Semiconductor Compiance Pin Descriptions Pin Assignments 5 ON/OFF 4 Feedback 3 Gnd 2 Output 1 Vin TO220B-5L/TO220-5L 5 ON/OFF 4 Feedback 3 Gnd 2 Output 1 Vin Name Description Vin Input supply voltage Output Switching output Gnd Ground Feedback Output voltage feedback ON/OFF ON/OFF shutdown Active is “Low” or floating TO263-5L Block Diagram VIN UNREGULATED DC INPUT INTERNAL REGULATOR 1 + ON/OFF 5 ON/OFF 4 CIN FEEDBACK FIXED GAIN ERRORAMP R2 R1 1.0k + - COMPARATOR 3 AMP DRIVER SWITCH + - OUTPUT L1 VOUT + D1 1.23V 52kHZ BAND-GAP REFERENCE OSCILLATOR RESET COUT THERMAL CURRENT SHUTDOWN LIMIT L O A D GND 3.3V, R2 =1.7K 5V, R2 = 3.1K 12V, R2 = 8.84K 15V, R2 =11.3K For ADJ, Version R1 = Open, R2 =0Ω Ordering information Temperature Range -40°C ≤ TA ≤ 125°C Output Voltage, V 3.3 5.0 12 Package Type 15 ADJ LM2576HVS-3.3 LM2576HVS -5.0 LM2576HVS -12 LM2576HVS -15 LM2576HVS -ADJ LM2576S -3.3 LM2576S - 5.0 LM2576S -12 LM2576S -15 LM2576S -ADJ LM2576HVT -3.3 LM2576HVT -5.0 LM2576HVT -12 LM2576HVT-15 LM2576HVT- ADJ LM2576T -3.3 LM2576T - 5.0 LM2576T -12 LM2576T -15 LM2576T -ADJ TO-263 TO-220 www.msksemi.com LM2576XX-MS/LM2576HVXX-MS Semiconductor Absolute Maximum Ratings (Note 1) Parameter Maximum Supply Voltage LM2576 LM2576HV ON/OFF Pin Input Voltage Output Voltage to Ground (Steady State) Power Dissipation Storage Temperature Range Maximum Junction Temperature Minimum ESD Rating (C= 100pF, R = 1.5 k Ω) Lead Temperature (Soldering, 10 Seconds) Operating Ratings Temperature Range LM2576/LM2576HV Supply Voltage Maximum 45 57 -0.3V ≤ V ≤ +VIN -1 Internally Limited -65 to +150 150 2 260 Parameter Compiance Units V V W °C °C kV °C Value -40 ≤ TJ ≤ +125 Units °C 40 57 V LM2576 LM2576HV Electrical Characteristics LM2576- 3.3,LM2576HV -3.3 Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range. Symbol Parameter LM2576 -3.3 LM2576HV -3.3 Conditions Typ Units (Limits) Limit (Note 2) SYSTEM PARAMETERS (Note 3) Test Circuit Figure 2 VOUT Output Voltage VIN =12V, ILOAD =0.5A Circuit of Figure 2 3.3 VOUT Output Voltage LM2576 6V ≤ VIN ≤ 40V, 0.5A ≤ ILOAD ≤ 3A Circuit of Figure 2 3.3 VOUT Output Voltage LM2576HV 6V ≤ VIN ≤ 60V, 0.5A ≤ ILOAD ≤ 3A Circuit of Figure 2 3.3 η Efficiency VIN =12V, ILOAD =3A 75 3.234 3.366 V V(Min) V(Max) 3.168/3.135 3.432/3.465 V V(Min) V(Max) 3.168/3.135 3.450/3.482 V V(Min) V(Max) % Electrical CharacteristicsLM2576 -5.0,LM2576HV-5.0 Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range. Symbol Parameter LM2576 -5.0 LM2576HV -5.0 Conditions Typ SYSTEM PARAMETERS (Note 3) Test Circuit Figure 2 VIN =12V, ILOAD =0.5A VOUT Output Voltage Circuit of Figure 2 5.0 VOUT OutputVoltage LM2576 0.5A ≤ ILOAD ≤ 3A, 8V ≤ VIN ≤ 40V Circuit of Figure 2 5.0 VOUT Output Voltage LM2576HV 0.5A ≤ ILOAD ≤ 3A, 8V ≤ VIN ≤ 60V Circuit of Figure 2 5.0 η Efficiency VIN =12V, ILOAD =3A 77 Units (Limits) Limit (Note 2) 4.900 5.100 V V(Min) V(Max) 4.800/4.750 5.200/5.250 V V(Min) V(Max) 4.800/4.750 5.225/5.275 V V(Min) V(Max) % www.msksemi.com LM2576XX-MS/LM2576HVXX-MS Semiconductor Compiance Electrical Characteristics LM2576 -12, LM2576HV -12 Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range. Symbol Parameter Conditions LM2576 -12 LM2576HV -12 Typ SYSTEM PARAMETERS (Note 3) Test Circuit Figure 2 VIN =25V, ILOAD =0.5A VOUT Output Voltage Circuit of Figure 2 Limit(Note 2) 12 VOUT OutputVoltage LM2576 0.5A ≤ ILOAD ≤ 3A, 15V ≤ VIN ≤ 40V Circuit of Figure 2 12 VOUT Output Voltage LM2576HV 0.5A ≤ ILOAD ≤ 3A, 15V ≤ VIN ≤ 60V Circuit of Figure 2 12 η Efficiency VIN =15V, ILOAD =3A 88 Units (Limits) 11.76 12.24 V V(Min) V(Max) 11.52/11.40 12.48/12.60 V V(Min) V(Max) 11.52/11.40 12.54/12.66 V V(Min) V(Max) % ElectricalCharacteristicsLM2576 -15,LM2576HV -15 Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range. Symbol Parameter Conditions LM2576 -15 LM2576HV -15 Typ SYSTEM PARAMETERS (Note 3) Test Circuit Figure 2 VIN =25, ILOAD =0.5A Output Voltage VOUT Circuit of Figure 2 Limit (Note 2) 15 VOUT OutputVoltage LM2576 0.5A ≤ ILOAD ≤ 3A, 18≤ VIN ≤ 40V Circuit of Figure 2 15 VOUT Output Voltage LM2576HV 0.5A ≤ ILOAD ≤ 3A, 18 ≤ VIN ≤ 60V Circuit of Figure 2 15 η Efficiency VIN =18V, ILOAD =3A 88 Units (Limits) 14.70 15.30 V V(Min) V(Max) 14.40/14.25 15.60/15.75 V V(Min) V(Max) 14.40/14.25 15.68/15.83 V V(Min) V(Max) % Electrical Characteristics LM2576 -ADJ, LM2576HV -ADJ Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range. Symbol Parameter Conditions LM2576 -ADJ LM2576HV -ADJ Typ Units (Limits) Limit(Note 2) SYSTEM PARAMETERS (Note 3) Test Circuit Figure 2 VOUT Feedback Voltage VIN =12V, ILOAD =0.5A, VOUT =5V Circuit of Figure 2 1.230 VOUT Feedback Voltage LM2576 0.5A ≤ ILOAD ≤ 3A , 8V ≤ VIN ≤ 40V VOUT =5V Circuit of Figure 2 1.230 VOUT Feedback Voltage LM2576HV 0.5A ≤ ILOAD ≤ 3A, 8V ≤ VIN ≤ 60V, VOUT =5V Circuit of Figure 2 1.230 η Efficiency VIN =12V, ILOAD =3A, VOUT =5V 77 1.217 1.243 V V(Min) V(Max) 1.193/1.180 1.267/1.280 V V(Min) V(Max) 1.193/1.180 1.273/1.286 V V(Min) V(Max) % www.msksemi.com LM2576XX-MS/LM2576HVXX-MS Semiconductor Compiance All Output VoltageVersions Electrical Characteristics Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range. Unless otherwise specified, VIN =12V for the 3.3V, 5V, and Adjustable version, VIN =25V for the 12V version, and VIN =30V for the 15V version, , ILOAD =500mA. Symbol Parameter Conditions LM2576 -XX LM2576HV-XX Typ Limit (Note 2) Units (Limits) DEVICE PARAMETERS Ib Feedback Bias Current VOUT =5V (Adjustable Version Only) 50 fO Oscillator Frequency (Note 8) 52 VSAT Saturation Voltage IOUT =3A (Note 4) 1.4 DC Max Duty Cycle (ON) (Note 5) 98 ICL Current Limit (Notes 4, 8) 5.8 IL Output Leakage Current (Notes 6, 7): IQ Quiescent Current (Note 6) ISTBY Standby Quiescent Current ON/OFF Pin = 5V (OFF) Output = -1V Output = -1V 7.5 5 50 100/500 nA 47/42 58/63 kHz kHz(Min) kHz(Max) 1.8/2.0 V V(Max) 93 % %(Min) 4.2/3.5 6.9/7.5 A A(Min) A(Max) 2 30 mA(Max) mA mA(Max) 10 mA mA(Max) 200 µA µA(Max) ON/OFF CONTROL VIH VIL IIH IIL ON/OFF Pin Logic Input Level ON/OFF Pin Input Current VOUT = 0V 1.4 2.2/2.4 V(Min) VOUT = Nominal Output Voltage 1.2 1.0/0.8 V(Max) 30 µA µA(Max) 10 µA µA(Max) ON/OFF Pin = 5V (OFF) ON/OFF Pin = 0V (ON) 12 0 Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. Note 2: All limits guaranteed at room temperature (standa rd type face) and at temperature extremes (bold type face). Note 3: External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the LM2576/LM2576HV is used as shown in the Figure 2 test circuit, system performance will be as shown in system parameters section of Electrical Characteristics. Note 4: Output pin sourcing current. No diode, inductor or capacitor connected to output. Note 5: Feedback pin removed from output and connected to 0V. Note 6: Feedback pin removed from output and connected to +12V for the Adjustable, 3.3V, and 5V, versions, and +25V for the 12V and 15V versions, to force the output transistor OFF. Note 7: VIN =40V (60V for high voltage version). Note 8: The oscillator frequency reduces to approximately 11 kHz in the event of an output short or an overload which causes the regulated output voltage to drop approximately 40% from the nominal output voltage. This self protections feature lowers the average power dissipation of the IC by lowering the minimum duty cycle from 5% down to approximately 2%. www.msksemi.com LM2576XX-MS/LM2576HVXX-MS Semiconductor Compiance Typical Performance Characteristics (Circuit of Figure 2) Normalized Output Voltage VIN =20V I L O A D = 500mA Normalized at T J =25°C Line Regulation Dropout Voltage I L O A D = 500mA TJ =25°C L 1 = 150 I L O A D = 3A 3.3V, 5V & ADJ 12V & 15V I L O A D = 1A I L O A D = 200m A R IND = 0.1Ω JUNCTION TEMPERATURE (°C) Standby Quiescent Current INPUT VOLTAGE(V) JUNCTION TEMPERATURE (°C) Quiescent Current Current Limit VIN = 25V VOUT = 5V Measuredat Ground Pin TJ =25°C VIN = 40V VON/OFF = 5V VIN =12 V JUNCTION TEMPERATURE (°C) Switch Saturation Voltage ILOAD = 3A ILOAD = 200mA INPUT VOLTAGE (V) JUNCTION TEMPERATURE (°C) Efficiency Oscilator Frequency Normalizedat25°C I L O A D = 3A -55°C 15V OUT 25°C 150°C TJ =25°C I L O A D = 200m A VIN = 40V 5V IL O A D = 3A SWITCHCURRENT (A) Minimum Operating Voltage Adjustable Version Only INPUT VOLTAGE(V) JUNCTION TEMPERATURE (°C) Quiescent Current vs Duty Cycle Feedback Voltage vs Duty Cycle Adjustable Version Only VIN = 40V JUNCTION TEMPERATURE (°C) Adjustable Version Only ILOAD = 500mA VIN = 7V VOUT ≈ 1.23V ILOAD = 500mA V IN = 12V IL O A D = 200mA VIN = 7V VIN = 40V I LOAD = 500mA DUTY CYCLE (%) DUTY CYCLE (%) www.msksemi.com LM2576XX-MS/LM2576HVXX-MS Semiconductor Maximum Power Dissipation (TO-263) Compiance Feedback Pin Current Adjustable Version Only θ J A = 32°C/W θJ A = 37°C/W θJ A = 50°C/W θJ A = 73°C/W AMBIENT TEMPERATURE (°C) JUNCTION TEMPERATURE (°C) Switching Waveforms Load Transient A Output Voltage Change B C Load Current D 5 s/div 100 VOUT =15V A: Output Pin Voltage, 50V/div B: Output Pin Current, 2A/div C: Inductor Current, 2A/div D: Output Ripple Voltage, 50mV/div, AC-Coupled Horizontal Time Base: 5µs/div www.msksemi.com LM2576XX-MS/LM2576HVXX-MS Semiconductor Compiance Test Circuit and Layout Guidelines As in any switching regulator, layout is very important. Rapidly switching currents associated with wiring inductance generate voltage transients which can cause problems. For minimal inductance and ground loops, the length of the leads indicated by heavy lines should be kept as short as possible. Single-point grounding (as indicated) or ground plane construction should be used for best results. When using the Adjustable version, physically locate the programming resistors near the regulator, to keep the sensitive feedback wiring short. Fixed Output Voltage Versions (Figure 2a) +VIN 1 VIN UNREGULATED DC INPUT + G1 N00 F LM2576HVFIXED OUTPUT FEEDBACK 4 OUTPUT 2 D 3 ON/OFF 5 L1 100 H MBR360 VOUT + L O A D COUT 1000 CIN — 100µF, 75V, Aluminum Electrolytic COUT —1000µF, 25V, Aluminum Electrolytic D1 — Schottky, MBR360 L1 — 100µH, Pulse Eng. PE-92108 R1 — 2k, 0.1% R2 — 6.12k, 0.1% Adjustable Output Voltage Version (Figure 2b) +VIN 1 7V -60V UNREGULATED DC INPUT + 100 C IN F GND LM2576HVADJ 5 3 FEEDBACK 4 L1 OUTPUT 2 100 VOUT 5.00V R2 C OUT ON/OFF MBR360 1000 R1 L O A D VOUT VREF (1 + R R 2 2 ) V R1 ( OUT− )1 VREF where VREF = 1.23V, R1 between 1k and 5k www.msksemi.com LM2576XX-MS/LM2576HVXX-MS Semiconductor Compiance Package Information (1) TO220-5L www.msksemi.com LM2576XX-MS/LM2576HVXX-MS Semiconductor Compiance Package Information (2) TO263-5 www.msksemi.com LM2576XX-MS/LM2576HVXX-MS Semiconductor Compiance Attention ■ Any and all MSKSEMI Semiconductor products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft's control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. 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