LM2590HV LM2590HV SIMPLE SWITCHERPower Converter 150 kHz 1A Step-Down Voltage Regulator, with Features Literature Number: SNVS084B
LM2590HV SIMPLE SWITCHER ® Power Converter 150 kHz 1A Step-Down Voltage Regulator, with Features General Description Features The LM2590HV series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 1A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, and an adjustable output version.
LM2590HV Absolute Maximum Ratings ESD Susceptibility (Note 1) Human Body Model (Note 3) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Maximum Supply Voltage (VIN) S Package 63V SD /SS Pin Input Voltage (Note 2) 6V Delay Pin Voltage (Note 2) 1.5V +215˚C Infrared (10 sec.) +245˚C +260˚C Maximum Junction Temperature +150˚C −0.
(Continued) Specifications with standard type face are for TJ = 25˚C, and those with boldface type apply over full Operating Temperature Range. Symbol η Parameter Efficiency Conditions LM2590HV-ADJ Units (Limits) Typ Limit (Note 4) (Note 5) VIN = 12V, VOUT = 3V, ILOAD = 1A 76 % All Output Voltage Versions Electrical Characteristics Specifications with standard type face are for TJ = 25˚C, and those with boldface type apply over full Operating Temperature Range.
LM2590HV All Output Voltage Versions Electrical Characteristics (Continued) 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.
NormalizedOutput Voltage (Circuit of Figure 1) Line Regulation Efficiency 10134702 Switch SaturationVoltage 10134703 Switch Current Limit 10134704 Dropout Voltage 10134706 10134705 Operating Quiescent Current LM2590HV Typical Performance Characteristics Shutdown Quiescent Current 10134708 10134709 5 10134707 Minimum Operating Supply Voltage 10134710 www.national.
LM2590HV Typical Performance Characteristics Feedback Pin Bias Current (Circuit of Figure 1) (Continued) Flag Saturation Voltage 10134711 10134714 Soft-start Response 10134713 10134712 Shutdown /Soft-start Current Soft-start Switching Frequency 10134715 Shutdown/Soft-start Threshold Voltage 10134718 Delay Pin Current 10134716 Internal Gain-Phase Characteristics 10134753 10134778 www.national.
(Circuit of Figure 1) (Continued) Discontinuous Mode Switching Waveforms VIN = 20V, VOUT = 5V, ILOAD = 250 mA L = 15 µH, COUT = 150 µF, COUT ESR = 90 mΩ Continuous Mode Switching Waveforms VIN = 20V, VOUT = 5V, ILOAD = 1A L = 52 µH, COUT = 100 µF, COUT ESR = 100 mΩ 10134720 10134719 Horizontal Time Base: 2 µs/div. Horizontal Time Base: 2 µs/div. A: Output Pin Voltage, 10V/div. A: Output Pin Voltage, 10V/div. B: Inductor Current 0.5A/div. B: Inductor Current 0.25A/div.
LM2590HV Test Circuit and Layout Guidelines Fixed Output Voltage Versions 10134724 Component Values shown are for VIN = 15V, VOUT = 5V, ILOAD = 1A.
LM2590HV Block Diagram 10134730 Feedback (Pin 6) — Senses the regulated output voltage to complete the feedback loop. This pin is directly connected to the Output for the fixed voltage versions, but is set to 1.23V by means of a resistive divider from the output for the Adjustable version. If a feedforward capacitor is used (Adjustable version), then a negative voltage spike is generated on this pin whenever the output is shorted.
LM2590HV PIN FUNCTIONS (Continued) Note If any of the above three features (Shutdown /Soft-start, Error Flag, or Delay) are not used, the respective pins can be left open. 10134731 FIGURE 2. Soft-Start, Delay, Error Output www.national.
LM2590HV 10134732 FIGURE 3. Timing Diagram for 5V Output INDUCTOR VALUE SELECTION GUIDES (For Continuous Mode Operation) 10134726 FIGURE 4. LM2590HV-3.3 11 www.national.
LM2590HV INDUCTOR VALUE SELECTION GUIDES (For Continuous Mode Operation) (Continued) 10134727 FIGURE 5. LM2590HV-5.0 10134729 FIGURE 6. LM2590HV-ADJ www.national.
(For Continuous Mode Operation) (Continued) 10134765 FIGURE 7. Current Ripple Ratio Coilcraft Inc. Coilcraft Inc., Europe Pulse Engineering Inc. Phone (USA): 1-800-322-2645 Web Address http://www.coilcraft.com Phone (UK): 1-236-730595 Web Address http://www.coilcraft-europe.com Phone (USA): 1-858-674-8100 Web Address http://www.pulseeng.com Pulse Engineering Inc., Phone (UK): 1-483-401700 Europe Web Address http://www.pulseeng.com Renco Electronics Inc.
LM2590HV Application Information INDUCTOR SELECTION PROCEDURE Application Note AN-1197 titled ’Selecting Inductors for Buck Converters’ provides detailed information on this topic. For a quick-start the designer may refer to the nomographs provided in Figure 4 to Figure 6.
relatively high RMS currents flowing in a buck regulator’s input capacitor, this capacitor should be chosen for its RMS current rating rather than its capacitance or voltage ratings, although the capacitance value and voltage rating are directly related to the RMS current rating. The voltage rating of the capacitor and its RMS ripple current capability must never be exceeded.
LM2590HV Application Information (Continued) 10134742 FIGURE 9. Typical Circuit Using Shutdown /Soft-start and Error Flag Features 10134743 FIGURE 10. Inverting −5V Regulator With Shutdown and Soft-start lNVERTING REGULATOR The circuit in Figure 10 converts a positive input voltage to a negative output voltage with a common ground.
LM2590HV Application Information (Continued) suming 100% efficiency, which is never so. Therefore expect IPEAK to be an additional 10-20% higher than calculated from the above equation. The reader is also referred to Application Note AN-1157 for examples based on positive to negative configuration. The maximum voltage appearing across the regulator is the absolute sum of the input and output voltage, and this must be limited to a maximum of 60V.
LM2590HV Application Information 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. (Continued) possible. For best results, external components should be located as close to the switcher lC as possible using ground plane construction or single point grounding.
LM2590HV Physical Dimensions inches (millimeters) unless otherwise noted 7-Lead TO-220 Bent and Staggered Package Order Number LM2590HVT-3.3, LM2590HVT-5.0 or LM2590HVT-ADJ NS Package Number TA07B 19 www.national.
LM2590HV SIMPLE SWITCHER Power Converter 150 kHz 1A Step-Down Voltage Regulator, with Features Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 7-Lead TO-263 Bent and Formed Package Order Number LM2590HVS-3.3, LM2590HVS-5.
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