LM2990是TI公司的一款单通道LDO产品，LM2990是负低压降稳压器，本页介绍了LM2990的产品说明、应用、特性等，并给出了与LM2990相关的TI元器件型号供参考。
LM2990 - 负低压降稳压器 - 单通道LDO - 线性稳压器(LDO) - TI公司（Texas Instruments，德州仪器）
- Input Voltage: –26 V to –6 V
- Fixed Output Voltages: −5 V, −5.2 V, −12 V, and −15 V
- 5% Output Accuracy over Entire Operating Range
- Output Current in Excess of 1 A
- Dropout Voltage Typically 0.6 V at 1-A Load
- Low Quiescent Current
- Internal Short-Circuit Current Limit
- Internal Thermal Shutdown with Hysteresis
- Functional Complement to the LM2940 Series
- Post Switcher Regulator
- Local, On-Card Regulation
- Battery Operated Equipment
The LM2990 is a three-terminal, low-dropout, 1-A negative voltage regulator available with fixed output voltages of −5 V, −5.2 V, −12 V, and −15 V.
The LM2990 uses circuit design techniques to provide low-dropout and low-quiescent current. The dropout voltage at 1-A load current is typically 0.6 V and an ensured worst-case maximum of 1 V over the entire operating temperature range. The quiescent current is typically 1 mA with 1-A load current and an input-output voltage differential greater than 3 V. A unique circuit design of the internal bias supply limits the quiescent current to only 9 mA (typical) when the regulator is in the dropout mode (VOUT − VIN ≤ 3 V). Output voltage accuracy is ensured to ±5% over load and temperature extremes.
The LM2990 also implements short-circuit proof, and thermal shutdown includes hysteresis to enhance the reliability of the device when overloaded for an extended period of time.
All these features make the LM2990 an ideal negative power supply suited for dual supply systems. The device may also be used as fixed or adjustable current sink load.
The LM2990 is available in two 3-pin packages and is rated for operation over the junction temperature range of −40°C to 125°C.
| PART NUMBER | PACKAGE | BODY SIZE (NOM) |
|---|---|---|
| LM2990 | DDPAK/TO-263 (3) | 10.20 mm x 9.00 mm |
| TO-220 (3) | 14.99 mm x 10.16 mm |
