LM2675 SIMPLE SWITCHER Power Converter High Efficiency 1A Step-Down Voltage Regulator
LM2675 特性Features
- Efficiency up to 96%
- Available in SO-8, 8-pin DIP and LLP packages
- Computer Design Software LM267X Made Simple (version 6.0)
- Simple and easy to design with
- Requires only 5 external components
- Uses readily available standard inductors
- 3.3V, 5.0V, 12V, and adjustable output versions
- Adjustable version output voltage range: 1.21V to 37V
- ±1.5% max output voltage tolerance over line and load conditions
- Guaranteed 1A output load current
- 0.25Ω DMOS Output Switch
- Wide input voltage range: 8V to 40V
- 260 kHz fixed frequency internal oscillator
- TTL shutdown capability, low power standby mode
- Thermal shutdown and current limit protection
LM2675 概述Description
The LM2675 series of regulators are monolithic integrated circuits built with a LMDMOS process. These regulators provide all the active functions for a step-down (buck) switching regulator, capable of driving a 1A load current 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.
Requiring a minimum number of external components, these regulators are simple to use and include patented internal frequency compensation (Patent Nos. 5,382,918 and 5,514,947) and a fixed frequency oscillator.
The LM2675 series operates at a switching frequency of 260 kHz, thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Because of its very high efficiency (>90%), the copper traces on the printed circuit board are the only heat sinking needed.
A family of standard inductors for use with the LM2675 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies using these advanced ICs. Also included in the datasheet are selector guides for diodes and capacitors designed to work in switch-mode power supplies.
Other features include a guaranteed ±1.5% tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring typically 50 µA stand-by current. The output switch includes current limiting, as well as thermal shutdown for full protection under fault conditions.
To simplify the LM2675 buck regulator design procedure, there exists computer design software, LM267X Made Simple version 6.0.
LM2675 应用Applications
- Simple High Efficiency (>90%) Step-Down (Buck) Regulator
- Efficient Pre-Regulator for Linear Regulators
- Positive-to-Negative Converter
LM2675 典型性能Typica Performance
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LM2675 性能参数Parametrics
| Paramaters / Values | LM2675 | LM22675 | LM25575 | LM5575 |
|---|---|---|---|---|
| Output Current | 1000 mA | 1000 mA | 1500 mA | 1500 mA |
| Input Min Voltage | 6.5, 15 Volt | 4.5 Volt | 6 Volt | 6 Volt |
| Input Max Voltage | 40 Volt | 42 Volt | 42 Volt | 75 Volt |
| Output Min | 3.3, 1.23, 12, 5 Volt | 1.285 Volt | 1.23 Volt | 1.23 Volt |
| Output Max | 3.3, 12, 37, 5 Volt | 40 Volt | 70 Volt | |
| Frequency Min | 260 kHz | 50 kHz | 50 kHz | |
| Frequency Max | 260 kHz | 1000 kHz | 500 kHz | |
| Efficiency (peak) | 90, 94, 86 % | 92 % | 91 % | 87 % |
| On/Off Pin | Yes | Yes | Yes | Yes |
| PowerGood / Error Flag | No | No | No | No |
| SoftStart | No | No | Yes | Yes |
| Sync Pin | No | No | Yes | Yes |
| Flyback | No | No | No | No |
| RegType | Switching Regulator | Switching Regulator | Switching Regulator | Switching Regulator |
| Temperature Min | -40 deg C | -40 deg C | -40 deg C | -40 deg C |
| Temperature Max | 125 deg C | 125 deg C | 125 deg C | 125 deg C |
| Adjustable Output | Yes, No | Yes | Yes | Yes |
| Adj Switch Frequency | No | No | Yes | Yes |
| PWM Mode | Voltage with Vin Feedforward | Voltage Mode Control | Current | Current |
| Topology | Buck | Buck | Buck | Buck |
| Special Features | Internal Type 3 compensation, 1.5% output voltage accuracy, SIMPLE SWITCHER regulator | 500 kHz Switching Frequency | 1.5% feedback voltage accuracy, emulated current mode | 1.5% feedback voltage accuracy, emulated current mode |
| Step-Down | Yes | Yes | Yes | Yes |
| Multiple Output Capability | No | No | No | No |
| Output Power | Undefined Watt | Undefined Watt | Undefined Watt | |
| Output Voltage | 3.3, 12, Undefined, 5 Volt | Undefined Volt | Undefined Volt | |
| Output Range | 12V, 1.23V to 37V, 3.3V, 5V | 1.23V to 37V | 1.23V to 70V | |
| Switching Frequency | 260 kHz | 500 kHz | 1000 kHz | 500 kHz |
| Regulator Family | SIMPLE SWITCHER | SIMPLE SWITCHER | SIMPLE SWITCHER | SIMPLE SWITCHER |
| Synchronous Rectification | No | No | No | No |
LM2675 芯片订购型号
| Part Number(s) (NSID) |
Top View | Availability | Budgetary Pricing | Pack Size |
|---|---|---|---|---|
| LM2675LD-5.0/NOPB LM2675LD-5.0 |
 LLP |
Full production Lead Time: 6 weeks |
$1.68 each at 1K+ pcs | rail of 1000
 |
| LM2675LD-ADJ/NOPB LM2675LD-ADJ |
LLP |
Full production Lead Time: 16 weeks |
$1.68 each at 1K+ pcs | rail of 1000
|
| LM2675LDX-ADJ/NOPB LM2675LDX-ADJ |
LLP |
Full production Lead Time: 6 weeks |
$1.68 each at 1K+ pcs | reel |
| LM2675M-12/NOPB LM2675M-12 |
 SOIC NARROW |
Full production Lead Time: 8 weeks |
$1.68 each at 1K+ pcs | rail of 95
 |
| LM2675M-3.3/NOPB LM2675M-3.3 |
SOIC NARROW |
Full production Lead Time: 6 weeks |
$1.68 each at 1K+ pcs | rail of 95
|
| LM2675M-5.0/NOPB LM2675M-5.0 |
SOIC NARROW |
Full production Lead Time: 6 weeks |
$1.68 each at 1K+ pcs | rail of 95
|
| LM2675M-ADJ/NOPB LM2675M-ADJ |
SOIC NARROW |
Full production Lead Time: 16 weeks |
$1.68 each at 1K+ pcs | rail of 95
|
| LM2675MX-12/NOPB LM2675MX-12 |
SOIC NARROW |
Full production Lead Time: 6 weeks |
$1.68 each at 1K+ pcs | rail of 2500
|
| LM2675MX-3.3/NOPB LM2675MX-3.3 |
SOIC NARROW |
Full production Lead Time: 6 weeks |
$1.68 each at 1K+ pcs | rail of 2500
|
| LM2675MX-5.0/NOPB LM2675MX-5.0 |
SOIC NARROW |
Full production Lead Time: 12 weeks |
$1.68 each at 1K+ pcs | rail of 2500
|
| LM2675MX-ADJ/NOPB LM2675MX-ADJ |
SOIC NARROW |
Full production Lead Time: 12 weeks |
$1.68 each at 1K+ pcs | rail of 2500
|
| LM2675N-12/NOPB LM2675N-12 |
 MDIP |
Full production Lead Time: 8 weeks |
$1.68 each at 1K+ pcs | rail
of
40
|
| LM2675N-3.3/NOPB LM2675N-3.3 |
MDIP |
Full production Lead Time: 6 weeks |
$1.68 each at 1K+ pcs | rail
of
40
|
| LM2675N-5.0/NOPB LM2675N-5.0 |
MDIP |
Full production Lead Time: 6 weeks |
$1.68 each at 1K+ pcs | rail
of
40
|
| LM2675N-ADJ/NOPB LM2675N-ADJ |
MDIP |
Full production Lead Time: 16 weeks |
$1.68 each at 1K+ pcs | rail
of
40
|
LM2675 停产Obsolete Versions
| Obsolete Part | Alternate Part or Supplier | Source | Last Time Buy Date |
|---|---|---|---|
| LM2675LD-12 |
NONE |
NATIONAL SEMICONDUCTOR |
16 Nov 2008 |
| LM2675LD-3.3 |
NONE |
NATIONAL SEMICONDUCTOR |
16 Nov 2008 |
| LM2675LDX-12 |
NONE |
NATIONAL SEMICONDUCTOR |
16 Nov 2008 |
| LM2675LDX-3.3 |
NONE |
NATIONAL SEMICONDUCTOR |
16 Nov 2008 |
| LM2675LDX-5.0 |
NONE |
NATIONAL SEMICONDUCTOR |
16 Nov 2008 |
| LM2675MX-ADJEP |
NONE |
NATIONAL SEMICONDUCTOR |
16 Nov 2008 |
LM2675 应用技术支持与电子电路设计开发资源下载 Documents
- LM2675 数据手册DataSheet下载. pdf
- LM2675 封装形式尺寸图
- AN-1061: Application Note 1061 Power Conversion in Line-Powered Equipment
- AN-1135: Application Note 1135 LM267X 3A, 5A Evaluation Boards
- AN-1157: Application Note 1157 Positive to Negative Buck‐Boost Converter Using LM267X SIMPLE SWITCHER® Regulators
- AN-1120: Application Note 1120 LM2675-5.0EVAL 1 Amp Step-Down High-Efficiency SIMPLE SWITCHER Evaluation Board
- AN-1229: Application Note 1229 SIMPLE SWITCHER PCB Layout Guidelines
- LM2675 绿色环保信息