LM2596R-12

3.0A, 150kHz, Step-Down Switching Regulator LM2596 FEATURES TO-263 PKG  3.3V, 5.0V, 12V, and Adjustable Output version  Adjustable Output Voltage range, 1.2V to 37V 1 ±4% Max. Over Line and Load conditions          5 Guaranteed Output Current of 3A Available in TO-263, TO-220 Packages Requires Only 4 External Components Excellent Line and Load Regulation Specifications 150kHz Fixed Frequency Internal Oscillator TTL Shutdown Capability Low Power Standby Mode, IQ typically 100mA Thermal Shutdown and Current Limit Protection Moisture Sensitivity Level 3 TO-220 PKG 1 5 SOP8-PP PKG 4 APPLICATION       1 Simple High-Efficiency Step-Down(Buck) Regulator Efficient Pre-Regulator for Linear Regulators On-Card Switching Regulators Positive to Negative Converter(Buck-Boost) Negative Step-Up Converters Power Supply for Battery Chargers 1. Vin 2. Output 3. Ground 4. Feedback 5. On/Off ORDERING INFORMATION Device LM2596R-ADJ LM2596R-X.X LM2596T-ADJ LM2596T-X.X LM2596DP-ADJ Package TO-263 5L TO-220 5L SOP8-PP X.X = Output Voltage = 3.3, 5.0, 12 DESCRIPSION The LM2596 series of regulators are monolithic integrated circuits ideally suited for easy and convenient design of a step-down switching regulator (buck converter). All circuits of this series are capable of driving a 3.0A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5.0V,12V, and an adjustable output version. These regulators were designed to minimize the number of external components to simplify the power supply design. Standard series of inductors optimized for use with the LM2596 are offered by several different inductor manufacturers. Since the LM2596 converter is a switchmode power supply, its efficiency is significantly higher in comparison with popular three-terminal linear regulators, especially with higher input voltages. In many cases, the power dissipated is so low that no heatsink is required or its size could be reduced dramatically. A standard series of inductors optimized for use with the LM2596 are available from several different manufacturers. This feature greatly simplifies the design of switchmode power supplies. The LM2596 features include a guaranteed +/- 4% tolerance on output voltage within specified input voltages and output load conditions, and +/-15% on the oscillator frequency (+/- 2% over 0℃ to 125℃). External shutdown is included, featuring 80㎂ (typical) standby current. Self-protection features include a two stage frequency reducing current limit for output switch and an over temperature shutdown for complete protection under fault conditions. Jan. 2015 - Rev. 1.4.2 -1 - HTC 3.0A, 150kHz, Step-Down Switching Regulator LM2596 Typical Application (Fixed Output Voltage Versions) L1 33uH Vin VIN Vout OUTPUT LM2596-5.0 ON/OFF Cin 680uF FEEDBACK GND Cout 220uF D1 1N5824 Absolute Maximum Ratings Rating Symbol Value Unit Maximum Supply Voltage Vin 45 V On/Off Pin Input Voltage - -0.3V ≤ V ≤ +Vin V Output Voltage to Ground (Steady-State) - - 1.0 V PD Internally Limited W Thermal Resistance, Junction to Ambient PθJA 65 ℃/W Thermal Resistance, Junction to Case PθJC 5.0 ℃/W PD Internally Limited W Thermal Resistance, Junction to Ambient PθJA 70 ℃/W Thermal Resistance, Junction to Case PθJC 5.0 ℃/W Power Dissipation TO-220 5Lead TO-263 5Lead Storage Temperature Range Tstg -60 to +150 ℃ Minimum ESD Rating(Human Body Model) - 2.0 kV Lead Temperature (Soldering,10seconds) - 260 ℃ TJ 150 ℃ Maximum Junction Temperature Jan. 2015 - Rev. 1.4.2 -2 - HTC 3.0A, 150kHz, Step-Down Switching Regulator LM2596 OPERATING RATINGS (Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications, see the Electrical Characteristics.) Rating Symbol Value. Unit Operating Junction Temperature Range TJ -40 to +125 ℃ Supply Voltage Vin 40 V ELECTRICAL CHARACTERISTICS / SYSTEM PARAMETERS ([Note 1] Test Circuit Figure 2) (Unless otherwise specified, Vin = 12V for the 3.3V, 5.0V, and Adjustable version, Vin = 25V for the 12V version. ILOAD = 500 mA. For typical values TJ = 25°C, for min/max values TJ is the operating junction temperature range that applies [Note 2], unless otherwise noted.) Symbol Min TYP Max Unit Output Voltage (Vin=12V, ILOAD =0.5A, TJ=25℃) Vout 3.234 3.3 3.366 V Output Voltage (6.0V≤Vin≤40V, 0.5A≤ILOAD≤3.0A Vout TJ=25℃ 3.168 3.3 3.432 V TJ=-40℃ ~ +125℃ 3.135 - 3.465 η - 73 - % Output Voltage (Vin=12V, ILOAD=0.5A, TJ=25℃) Vout 4.9 5.0 5.1 V Output Voltage (8.0V≤Vin≤40V, 0.5A≤ILOAD≤3.0A Vout TJ=25℃ 4.8 5.0 5.2 V TJ=-40℃ ~ +125℃ 4.75 - 5.25 η - 80 - % Output Voltage (Vin=25V, ILOAD=0.5A, TJ=25℃) Vout 11.76 12 12.24 V Output Voltage (15V≤Vin≤40V, 0.5A≤ILOAD≤3.0A Vout TJ=25℃ 11.52 12 12.48 V TJ= -40℃ ~ +125℃ 11.4 - 12.6 η - 90 - % Feedback Voltage (Vin=12V, ILOAD=0.5A, TJ=25℃) Vout 1.217 1.23 1.243 V Feedback Voltage(8.0V≤Vin≤40V, 0.5A≤ILOAD≤3.0A, Vout=5.0V) Vout TJ=25℃ 1.193 1.23 1.267 V TJ= -40℃ ~ +125℃ 1.18 - 1.28 - 73 - Characteristics LM2596-3.3V ([Note 1] Test Circuit Figure 2) Efficiency (Vin=12V, ILOAD=3.0A) LM2596-5.0V ([Note 1] Test Circuit Figure 2) Efficiency (Vin=12V, ILOAD=3.0A) LM2596-12V ([Note 1] Test Circuit Figure 2) Efficiency (Vin=12V, ILOAD=3.0A) LM2596-ADJ ([Note 1] Test Circuit Figure 2) η Efficiency (Vin=12V, ILOAD=3.0A, Vout=5.0V) Jan. 2015 - Rev. 1.4.2 -3 - % HTC 3.0A, 150kHz, Step-Down Switching Regulator Characteristics LM2596 Symbol Min TYP Max Unit All Output Voltage Versions Feedback Bias Current (Vout=5.0V [Adjustable Version Only]) Ib TJ=25℃ 11.52 12 12.48 11.4 - 12.6 TJ=25℃ 127 150 173 TJ= 0 ~ +125℃ 110 - 173 TJ=25℃ - 1.16 1.4 TJ= 0 ~ +125℃ - - 1.5 - 100 - % 3.6 4.5 6.9 A 3.4 - 7.5 - - 50 - 2 30 - 5 - - - 10 TJ=25℃ - 80 200 TJ= 0 ~ +125℃ - - 250 TJ=25℃ 2.0 1.3 - TJ= 0 ~ +125℃ 2.0 - - TJ=25℃ - 1.3 0.6 TJ= 0 ~ +125℃ - - 0.6 TJ= 0 ~ +125℃ Oscillator Frequency nA Fosc Saturation Voltage (Iout=3.0A [note 3]) kHz Vsat Max Duty Cycle ("0") [Note 4] DC Current Limit (Peak Current [Note 3]) ICL TJ=25℃ TJ= 0 ~ +125℃ Output Leakage Current [Note 5 and 6], TJ=25℃ V IL Output = 0V Output = -1.0V Quiescent Current [Note 5] mA IQ TJ=25℃ TJ= 0 ~ +125℃ Standby Quiescent Current (ON/OFF Pin = 5.0V ("off")) mA ISTBY ㎂ ON/OFF Pin Logic Input Level (Test circuit Figure 2) Vout=0V VIH Vout=Nominal Output Voltage V VIL ON/OFF Pin Input Current (Test Circuit Figure 2) VLOGIC = 2.5V (Regulator OFF) IIH - 5 15 VLOGIC = 0.5V (Regulator ON) IIL - 0.02 5.0 ㎂ 1. External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the LM2596 is used as shown in the Figure 1 test circuit, system performance will be as shown in system parameters section . 2. Tested junction temperature range for the LM2596 : TLOW = –40°C THIGH = +125°C 3. Output (Pin 2) sourcing current. No diode, inductor or capacitor connected to output pin. 4. Feedback (Pin 4) removed from output and connected to 0 V. 5. Feedback (Pin 4) removed from output and connected to +12V for the Adjustable, 3.3V, and 5.0V versions, and '+25 V for the 12V versions, to force the output transistor “off”.C195 6. Vin = 40 V. Jan. 2015 - Rev. 1.4.2 -4 - HTC 3.0A, 150kHz, Step-Down Switching Regulator LM2596 TYPICAL PERFORMANCE CHARACTERISTICS (Circuit of Figure 2) Jan. 2015 - Rev. 1.4.2 -5 - HTC 3.0A, 150kHz, Step-Down Switching Regulator LM2596 TYPICAL PERFORMANCE CHARACTERISTICS (Circuit of Figure 2) Jan. 2015 - Rev. 1.4.2 -6 - HTC 3.0A, 150kHz, Step-Down Switching Regulator LM2596 Test Circuit and Layout Guidelines CIN = 470㎌, 50V, COUT = 220㎌, 25V (Aluminum Electrolytic Nichicon "PL Series" D1 = 5A, 40V Schottky Rectifier, IN5825 L1 = 68uH, L38 Cin = 470 ㎌, 50V, Cout = 220 ㎌, 35V (Aluminum Electrolytic Nichicon "PL Series" D1 = 5A, 40V Schottky Rectifier, IN5825 L1 = 68uH, R1 = 1 ㏀, 1%, R2 = R1 x (Vout / Vref - 1) As in any switching regulator, layout is very important. Rapidly switching currents associated with wiring inductance can generate voltage transients which can cause problems. For minimal inductance and ground loops, the wires indicated by heavy lines should be wide printed circuit traces and should be kept as short as possible. For best results, external components should be located as close to the switching lC as possible using ground plane construction or single point grounding. If open core inductors are used, special care must be taken as to the location and positioning of this type of inductor. Allowing the inductor flux to intersect sensitive feedback, lC ground path and COUT wiring can cause problems. When using the adjustable version, special care must be taken as to the location of the feedback resistors and the associated wiring. Physically locate both resistors near the IC, and route the wiring away from the inductor, especially an open core type of inductor. Jan. 2015 - Rev. 1.4.2 -7 - HTC 3.0A, 150kHz, Step-Down Switching Regulator LM2596 PIN FUNCTION DESCRIPTION Package Symbol TO-220 5L Description SOP8-PP TO-263 5L 1 1 VIN 2 2 VOUT 3 3 GND 4 4 FEEDBACK 5 5 ON/OFF - 6, 7, 8 N.C. Jan. 2015 - Rev. 1.4.2 This pin is the positive input supply for the LM2596 step–down switching regulator. In order to minimize voltage transients and to supply the switching currents needed by the regulator, a suitable input bypass capacitor must be present. This is the emitter of the internal switch. The saturation voltage Vsat of this output switch is typically 1.5 V. It should be kept in mind that the PCB area connected to this pin should be kept to a minimum in order to minimize coupling to sensitive circuitry. Circuit ground pin. This pin senses regulated output voltage to complete the feedback loop. The signal is divided by the internal resistor divider network R2, R1 and applied to the non–inverting input of the internal error amplifier. In the Adjustable version of the LM2596 switching regulator this pin is the direct input of the error amplifier and the resistor network R2, R1 is connected externally to allow programming of the output voltage. It allows the switching regulator circuit to be shut down using logic level signals, thus dropping the total input supply current to approximately 80uA. The threshold voltage is typically 1.3V. Applying a voltage above this value (up to +Vin) shuts the regulator off. If the voltage applied to this pin is lower than 1.3V or if this pin is left open, the regulator will be in the "on" condition. No Connect. -8 - HTC