Overview
The LM337BT, 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 LM337BT is suitable for a wide variety of applications, including local, on-card regulation, and can also be used as a programmable output regulator or as a precision current regulator.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Maximum Output Current | 1.5 A | A |
| Output Voltage Range | -1.2 V to -37 V | V |
| Line Regulation | 0.04 %/V | %/V |
| Load Regulation | 1 % | % |
| Reference Voltage | -1.25 V | V |
| Package Type | TO-220 | - |
| Pin Count | 3 | - |
| Minimum Operating Temperature | -40 °C | °C |
| Maximum Operating Temperature | +125 °C | °C |
| Maximum Input Voltage | -40 V | V |
| Thermal Resistance, Junction-to-Ambient | 70 °C/W | °C/W |
| Thermal Resistance, Junction-to-Case | 5.0 °C/W | °C/W |
Key Features
- Output current in excess of 1.5 A
- Output voltage 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 the need for stocking many fixed voltages
- Pb-free packages available
- Excellent thermal regulation and ripple rejection (77 dB)
- Low line and load regulation (0.01%/V and 0.3%/V respectively)
Applications
The LM337BT is versatile and can be used in a variety of applications, including local, on-card regulation. It can be configured as a programmable output regulator or as a precision current regulator by connecting a fixed resistor between the adjustment and output terminals. The regulator is also suitable for high voltage applications due to its floating operation capability.
Q & A
- What is the maximum output current of the LM337BT?
The maximum output current of the LM337BT is 1.5 A.
- What is the output voltage range of the LM337BT?
The output voltage range of the LM337BT is from -1.2 V to -37 V.
- What type of protection does the LM337BT have?
The LM337BT features internal thermal overload protection and internal short circuit current limiting constant with temperature.
- How is the output voltage set on the LM337BT?
The output voltage is set using two external resistors connected to the adjustment terminal.
- What is the reference voltage of the LM337BT?
The reference voltage of the LM337BT is -1.25 V.
- What is the thermal resistance of the LM337BT in the TO-220 package?
The thermal resistance, junction-to-ambient, is 70 °C/W, and junction-to-case is 5.0 °C/W.
- Can the LM337BT be used for high voltage applications?
Yes, the LM337BT can be used for high voltage applications due to its floating operation capability.
- What is the ripple rejection of the LM337BT?
The ripple rejection of the LM337BT is 77 dB.
- What are the operating temperature ranges for the LM337BT?
The operating temperature range is from -40 °C to +125 °C, and the storage temperature range is from -65 °C to +150 °C.
- Is the LM337BT available in Pb-free packages?
Yes, the LM337BT is available in Pb-free packages.
- Can the LM337BT be used as a precision current regulator?
Yes, by connecting a fixed resistor between the adjustment and output terminals, the LM337BT can be used as a precision current regulator.
