LM2990 - 负低压降稳压器

LM2990是TI德州仪器公司的一款单通道LDO产品，LM2990是负低压降稳压器，本站介绍了LM2990的封装应用图解、特点和优点、功能等，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) - 德州仪器

产品特性

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

产品应用

Post Switcher Regulator
Local, On-Card Regulation
Battery Operated Equipment

Typical Application

* and **: Required for stability. Must be at least a 10-μF aluminum electrolytic or a 1-μF solid tantalum to maintain stability. May be increased without bound to maintain regulation during transients. Locate the capacitor as close as possible to the regulator. The equivalent series resistance (ESR) is critical, and should be less than 10 Ω over the same operating temperature range as the regulator.

产品说明

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.

产品器件信息

PART NUMBER	PACKAGE	BODY SIZE (NOM)
LM2990	DDPAK/TO-263 (3)	10.20 mm x 9.00 mm
LM2990	TO-220 (3)	14.99 mm x 10.16 mm

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