SNVS074E May   2001  – May 2016 LM2591HV

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Description (continued)
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics LM2591HV-3.3
    6. 7.6 Electrical Characteristics LM2591HV-5.0
    7. 7.7 Electrical Characteristics LM2591HV-ADJ
    8. 7.8 Electrical Characteristics All Output Voltage Versions
    9. 7.9 Typical Characteristics
  8. 8 Parameter Measurement Information
    1. 8.1 Test Circuits
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Delayed Start-Up
      2. 9.3.2 Undervoltage Lockout
    4. 9.4 Device Functional Modes
      1. 9.4.1 Shutdown Mode
      2. 9.4.2 Active Mode
  10. 10Application and Implementation
    1. 10.1 Application Information
      1. 10.1.1 Feedforward Capacitor
      2. 10.1.2 Input Capacitor
      3. 10.1.3 Output Capacitor
      4. 10.1.4 Catch Diode
      5. 10.1.5 Inverting Regulator
      6. 10.1.6 Inverting Regulator Shutdown Methods
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
        1. 10.2.2.1 Inductor Selection Procedure
      3. 10.2.3 Application Curves
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Examples
  13. 13Device and Documentation Support
    1. 13.1 Community Resources
    2. 13.2 Trademarks
    3. 13.3 Electrostatic Discharge Caution
    4. 13.4 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

12 Layout

12.1 Layout Guidelines

As in any switching regulator, layout is very important. Rapid switching currents associated with wiring inductance can generate voltage transients, which can cause problems. For minimal inductance and ground loops (see Test Circuits), the wires indicated by heavy lines must be wide printed-circuit traces and must be kept as short as possible. For best results, external components must be placed as close to the switcher lC as possible using ground plane construction or single-point grounding.

If open core inductors are used, take special care as to the location and positioning of this type of inductor. Allowing the inductor flux to intersect sensitive feedback, lC groundpath, and COUT wiring can cause problems.

When using the adjustable version, take special care as to the location of the feedback resistors and the associated wiring. Physically place both resistors near the IC, and route the wiring away from the inductor, especially an open core type of inductor.

12.2 Layout Examples

LM2591HV 01258251(1).png
CIN = 470-μF, 50-V, aluminum electrolytic Panasonic HFQ Series
COUT = 330-μF, 35-V, aluminum electrolytic Panasonic HFQ Series
D1 = 5-A, 40-V Schottky rectifier, 1N5825
L1 = 47-μH, L39, Renco through hole
RPULL UP = 10k
CDELAY = 0.1 μF
CSD/SS = 0.1 μF
Thermalloy heat sink #7020
Figure 33. Typical Through-Hole PCB Layout, Fixed Output (1x Size), Double-Sided
LM2591HV 01258252(1).png
CIN = 470-μF, 50-V, aluminum electrolytic Panasonic, HFQ Series
COUT = 220-μF, 35-V, aluminum electrolytic Panasonic, HFQ Series
D1 = 5-A, 40-V Schottky Rectifier, 1N5825
L1 = 47-μH, L39, Renco, through-hole
R1 = 1 kΩ, 1%
R2 = Use formula in Detailed Design Procedure
RFF = See Feedforward Capacitor
RPULL UP = 10k
CDELAY = 0.1 μF
CSD/SS= 0.1 μF
Thermalloy heat sink #7020
Figure 34. Typical Through-Hole PCB Layout, Adjustable Output (1x Size), Double-Sided