Overview
The LM337D2TR4, produced by onsemi, is an adjustable 3-terminal negative linear voltage regulator. It is capable of supplying in excess of 1.5 A over an output voltage range of -1.2 V to -37 V. This regulator is exceptionally easy to use and requires only two external resistors to set the output voltage. It features internal current limiting, thermal shutdown, and safe area compensation, making it essentially blow-out proof. The LM337 is versatile and can be used for local, on-card regulation, as a programmable output regulator, or as a precision current regulator by connecting a fixed resistor between the adjustment and output terminals.
Key Specifications
| Parameter | Symbol | Value | Unit |
|---|---|---|---|
| Output Current | I_O | 1.5 A | A |
| Output Voltage Range | V_O | -1.2 V to -37 V | V |
| Input-Output Voltage Differential | V_I - V_O | 40 Vdc | Vdc |
| Power Dissipation | P_D | Internally Limited | W |
| Thermal Resistance, Junction-to-Ambient | R_thJA | 70 °C/W (D2PAK) | °C/W |
| Thermal Resistance, Junction-to-Case | R_thJC | 5.0 °C/W (D2PAK) | °C/W |
| Operating Junction Temperature Range | T_J | -40 to +125 °C | °C |
| Storage Temperature Range | T_stg | -65 to +150 °C | °C |
| Reference Voltage | V_REF | -1.25 V (Typical) | V |
| Line Regulation | K_VI | 0.01 %/V (Typical) | %/V |
| Load Regulation | K_VL | 0.3 %/V (Typical) | %/V |
Key Features
- Output Current in Excess of 1.5 A
- Output Adjustable between -1.2 V and -37 V
- Internal Thermal Overload Protection
- Internal Short Circuit Current Limiting Constant with Temperature
- Output Transistor Safe-Area Compensation
- Floating Operation for High Voltage Applications
- Eliminates Stocking many Fixed Voltages
- Available in Surface Mount D2PAK and Standard 3-Lead Transistor Package
- Pb-Free Packages are Available
Applications
The LM337D2TR4 is suitable for a wide variety of applications, including local, on-card regulation. It can be used to make a programmable output regulator or as a precision current regulator by connecting a fixed resistor between the adjustment and output terminals. Its floating operation capability makes it suitable for high voltage applications. Additionally, it can be used in scenarios where adjustable negative voltage regulation is required, such as in power supplies, audio equipment, and other electronic systems.
Q & A
- What is the output current range of the LM337D2TR4?
The LM337D2TR4 can supply an output current in excess of 1.5 A.
- What is the adjustable output voltage range of the LM337D2TR4?
The output voltage is adjustable between -1.2 V and -37 V.
- What kind of protection does the LM337D2TR4 have?
The LM337D2TR4 features internal thermal overload protection, internal short circuit current limiting, and output transistor safe-area compensation.
- What packages are available for the LM337D2TR4?
The LM337D2TR4 is available in surface mount D2PAK and standard 3-lead transistor packages.
- Is the LM337D2TR4 Pb-free?
- What is the operating junction temperature range for the LM337D2TR4?
The operating junction temperature range is -40 to +125 °C.
- How do you set the output voltage of the LM337D2TR4?
The output voltage is set using two external resistors connected to the adjustment terminal.
- Can the LM337D2TR4 be used as a precision current regulator?
- What is the typical reference voltage of the LM337D2TR4?
The typical reference voltage is -1.25 V.
- What is the ripple rejection of the LM337D2TR4?
The ripple rejection is 77 dB without CAdj and can be improved by adding a capacitor to the adjustment terminal.
