产品应用与封装尺寸
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图纸取自原厂规格书，点击可放大查看原始尺寸标注。
关键参数速览
- 电源电压 VCC
- 45V
产品特点 Features
- The LM2596 series of regulators are monolithic
- 3.3V, 5V, 12V, and Adjustable Output Versions
- 23 integrated circuits that provide all the active functions
- Adjustable Version Output Voltage Range, for a step-down (buck) switching regulator, capable of
- 1.2V to 37V ±4% Max Over Line and Load driving a 3A load with excellent line and load
- Conditions regulation. These devices are available in fixed output
- Available in TO-220 and TO-263 Packages voltages of 3.3V, 5V, 12V, and an adjustable output version.
- Ensured 3A Output Load Current
- Input Voltage Range Up to 40V Requiring a minimum number of external components, these regulators are simple to use and
- Requires Only 4 External Components include internal frequency compensation , and a
- Excellent Line and Load Regulation fixed-frequency oscillator.
- Specifications
- The LM2596 series operates at a switching frequency
- 150 kHz Fixed Frequency Internal Oscillator of 150 kHz thus allowing smaller sized filter
- TTL Shutdown Capability components than what would be needed with lower
- Low Power Standby Mode, I Typically 80 μA frequency switching regulators. Available in a standard 5-lead TO-220 package with several
绝对最大额定值 Absolute Maximum Ratings（TA = 25°C）
超过下表数值可能造成器件永久损坏，设计时请留余量。
| Through | Hole | TO-220 | (T) | 封装 | See | 封装2 | 型号 | KTT0005B |
|---|---|---|---|---|---|---|---|---|
| Maximum Supply Voltage | 45V | |||||||
| ON /OFF Pin Input | Voltage | −0.3 ≤ V ≤ +25V | ||||||
| Feedback Pin Voltage | −0.3 ≤ V ≤+25V | |||||||
| Output Voltage to | Ground | (Steady | State) | −1V | ||||
| Storage Temperature | Range | −65°C to +150°C |
数据来源：原厂规格书
电气特性 Electrical Characteristics（TA = 25°C）
| 符号 | 参数 | 条件 | 典型 | Limit | (Limits) |
|---|---|---|---|---|---|
| (1) (1) (1) (1) | LM2596-3.3 (2) LM2596-5.0 (2) LM2596-12 (2) LM2596-ADJ (2) LM2596-XX (1) (2) | ||||
| I | Feedback Bias Current | Adjustable Version Only, V = 1.3V | 10 | nA | |
| 50/100 | nA (max) | ||||
| f | Oscillator Frequency | See (3) | 150 | kHz | |
| 127/110 | kHz(min) | ||||
| 173/173 | kHz(max) | ||||
| V | Saturation Voltage | I = 3A (4) (5) | 1.16 | V | |
| DC Max | Duty Cycle (ON) | See (5) | 100 | % | |
| Min | Duty Cycle (OFF) | See (6) | 0 | ||
| I | Current Limit | Peak Current (4)(5) | 4.5 | A | |
| I | Output Leakage Current | Output = 0V (4)(6) | 50 | μA(max) | |
| Output = −1V (7) | 2 30 | mA mA(max) | |||
| I | Quiescent Current | See (6) | 5 10 | mA mA(max) | |
| (SQC) | methods. All limits are used to | calculate Average Outgoing Quality | Level (AOQL). | ||
| (4) No diode, | inductor or capacitor connected | to output pin. | |||
| Product Folder Links: | LM2596 (1) | LM2596-XX (2) | LM2596 | ||
| I | Standby Quiescent Current ON/OFF | pin = 5V (OFF) (7) | 80 | μA | |
| 200/250 | μA(max) | ||||
| θ | Thermal Resistance TO-220 | or TO-263 Package, Junction to Case | 2 | °C/W | |
| θ | TO-220 | Package, Junction to Ambient (8) | 50 | °C/W | |
| θ | TO-263 | Package, Junction to Ambient (9) | 50 | °C/W | |
| θ | TO-263 | Package, Junction to Ambient (10) | 30 | °C/W | |
| θ | TO-263 | Package, Junction to Ambient (11) | 20 | °C/W |
特性曲线（Typical Performance Curves）
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