LM2596 SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator
LM2596 特性Features
- 3.3V, 5V, 12V, and adjustable output versions
- Adjustable version output voltage range, 1.2V to 37V ±4% max over line and load conditions
- Available in TO-220 and TO-263 packages
- Guaranteed 3A output load current
- Input voltage range up to 40V
- Requires only 4 external components
- Excellent line and load regulation specifications
- 150 kHz fixed frequency internal oscillator
- TTL shutdown capability
- Low power standby mode, IQ typically 80 µA
- High efficiency
- Uses readily available standard inductors
- Thermal shutdown and current limit protection
LM2596 概述Description
The LM2596 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 3A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, and an adjustable output version.
Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation†, and a fixed-frequency oscillator.
The LM2596 series operates at a switching frequency of 150 kHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Available in a standard 5-lead TO-220 package with several different lead bend options, and a 5-lead TO-263 surface mount package.
A standard series of inductors are available from several different manufacturers optimized for use with the LM2596 series. This feature greatly simplifies the design of switch-mode power supplies.
Other features include a guaranteed ±4% tolerance on output voltage under specified input voltage and output load conditions, and ±15% on the oscillator frequency. External shutdown is included, featuring typically 80 µA standby current. Self protection features include a two stage frequency reducing current limit for the output switch and an over temperature shutdown for complete protection under fault conditions.
LM2596 应用领域Applications
- Simple high-efficiency step-down (buck) regulator
- On-card switching regulators
- Positive to negative converter
LM2596 典型性能Typical Application
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LM2596 功能框图Block Diagram
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LM2596 典型性能Typical Performance
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LM2596 性能参数Parametrics
| Paramaters / Values | LM2596 | LM22678 |
|---|---|---|
| Output Current | 5000 mA | 5000 mA |
| Input Min Voltage | 15, 8 Volt | 4.5 Volt |
| Input Max Voltage | 40 Volt | 42 Volt |
| Output Min | 3.3, 1.23, 12, 5 Volt | 1.285 Volt |
| Output Max | 3.3, 12, 37, 5 Volt | |
| Frequency Min | 260 kHz | |
| Frequency Max | 260 kHz | |
| Efficiency (peak) | 84, 92, 82 % | 92 % |
| On/Off Pin | Yes | Yes |
| PowerGood / Error Flag | No | No |
| SoftStart | No | No |
| Sync Pin | No | No |
| Flyback | No | No |
| RegType | Switching Regulator | Switching Regulator |
| Temperature Min | -40 deg C | -40 deg C |
| Temperature Max | 125 deg C | 125 deg C |
| Adjustable Output | Yes, No | Yes |
| Adj Switch Frequency | No | No |
| PWM Mode | Voltage with Vin Feedforward | Voltage Mode Control |
| Topology | Buck | Buck |
| Special Features | Internal Type 3 compensation, 2% output voltage accuracy, SIMPLE SWITCHER regulator | 500 kHz Switching Frequency |
| Step-Down | Yes | Yes |
| Multiple Output Capability | No | No |
| Output Power | Undefined Watt | |
| Output Voltage | 3.3, 12, Undefined, 5 Volt | |
| Output Range | 12V, 1.23V to 37V, 3.3V, 5V | |
| Switching Frequency | 260 kHz | 500 kHz |
| Regulator Family | SIMPLE SWITCHER | SIMPLE SWITCHER |
| Synchronous Rectification | No | No |
LM2596 芯片订购型号
| Part Number(s) (NSID) |
Top View | Availability | Budgetary Pricing | Pack Size |
|---|---|---|---|---|
| LM2596S-12/NOPB LM2596S-12 |
 TO-263 |
Full production Lead Time: 8 weeks |
$1.95 each at 1K+ pcs | rail of 45
 |
| LM2596S-3.3/NOPB LM2596S-3.3 |
TO-263 |
Full production Lead Time: 8 weeks |
$1.95 each at 1K+ pcs | rail of 45
|
| LM2596S-5.0/NOPB LM2596S-5.0 |
TO-263 |
Full production Lead Time: 8 weeks |
$1.95 each at 1K+ pcs | rail of 45
|
| LM2596S-ADJ/NOPB LM2596S-ADJ |
TO-263 |
Full production Lead Time: 6 weeks |
$1.95 each at 1K+ pcs | rail of 45
|
| LM2596SX-12/NOPB LM2596SX-12 |
TO-263 |
Full production Lead Time: 6 weeks |
$1.95 each at 1K+ pcs | reel of 500  |
| LM2596SX-3.3/NOPB LM2596SX-3.3 |
TO-263 |
Full production Lead Time: 6 weeks |
$1.95 each at 1K+ pcs | reel of 500 |
| LM2596SX-5.0/NOPB LM2596SX-5.0 |
TO-263 |
Full production Lead Time: 6 weeks |
$1.95 each at 1K+ pcs | reel of 500 |
| LM2596SX-ADJ/NOPB LM2596SX-ADJ |
TO-263 |
Full production Lead Time: 6 weeks |
$1.95 each at 1K+ pcs | reel of 500 |
| LM2596T-12/NOPB LM2596T-12 |
 TO-220 |
Full production Lead Time: 8 weeks |
$1.95 each at 1K+ pcs | rail of 45
|
| LM2596T-3.3/NOPB LM2596T-3.3 |
TO-220 |
Full production Lead Time: 8 weeks |
$1.95 each at 1K+ pcs | rail of 45
|
| LM2596T-5.0/NOPB LM2596T-5.0 |
TO-220 |
Full production Lead Time: 8 weeks |
$1.95 each at 1K+ pcs | rail of 45
|
| LM2596T-ADJ/NOPB LM2596T-ADJ |
TO-220 |
Full production Lead Time: 8 weeks |
$1.95 each at 1K+ pcs | rail of 45
|
LM2596 标准体系参考Reliability Metrics
| Part Number | Process | EFR Reject | EFR Sample Size | PPM | LTA Rejects | LTA Device Hours | FITS | MTTF (Hours) |
|---|---|---|---|---|---|---|---|---|
| LM2596S-12 | LB300 | 0 | 33664 | 0 | 0 | 3830500 | 1 | 1086914834 |
| LM2596S-3.3 | LB300 | 0 | 33664 | 0 | 0 | 3830500 | 1 | 1086914834 |
| LM2596S-5.0 | LB300 | 0 | 33664 | 0 | 0 | 3830500 | 1 | 1086914834 |
| LM2596S-ADJ | LB300 | 0 | 33664 | 0 | 0 | 3830500 | 1 | 1086914834 |
| LM2596SX-12 | LB300 | 0 | 33664 | 0 | 0 | 3830500 | 1 | 1086914834 |
| LM2596SX-3.3 | LB300 | 0 | 33664 | 0 | 0 | 3830500 | 1 | 1086914834 |
| LM2596SX-5.0 | LB300 | 0 | 33664 | 0 | 0 | 3830500 | 1 | 1086914834 |
| LM2596SX-ADJ | LB300 | 0 | 33664 | 0 | 0 | 3830500 | 1 | 1086914834 |
| LM2596T-12 | LB300 | 0 | 33664 | 0 | 0 | 3830500 | 1 | 1086914834 |
| LM2596T-3.3 | LB300 | 0 | 33664 | 0 | 0 | 3830500 | 1 | 1086914834 |
| LM2596T-5.0 | LB300 | 0 | 33664 | 0 | 0 | 3830500 | 1 | 1086914834 |
| LM2596T-ADJ | LB300 | 0 | 33664 | 0 | 0 | 3830500 | 1 | 1086914834 |
LM2596 应用技术支持与电子电路设计开发资源下载 Documents
- LM2596 数据手册DataSheet下载. pdf
- LM2596 封装形式尺寸图
- AN-1082: Application Note 1082 Adjust or Synchronize LM2586/88 Switching Frequency
- AN-1118: AN-1118 Simple Regulator Provides ±12V from 5V Source
- AN-1797: Application Note 1797 TO-263 THIN Package
- AN-1061: Application Note 1061 Power Conversion in Line-Powered Equipment
- AN-1229: Application Note 1229 SIMPLE SWITCHER PCB Layout Guidelines
- AN-1081: Application Note 1081 A Low Cost, Low Parts-Count DC/DC Converter With Multiple Outputs
- AN-1253: Application Note 1253 Wide-Input, High Voltage Buck Converter
- AN-1566: Application Note 1566 Techniques for Thermal Analysis of Switching Power Supply Designs
- AN-1207: Application Note 1207 LM2593HV Evaluation Board