| Manufacturer | Part # | Datasheet | Description |
 National Semiconductor ... | LM2991QML |  688Kb/13P | Negative Low Dropout Adjustable Regulator |
 National Semiconductor ... | LM2991J |  338Kb/11P | Negative Low Dropout Adjustable Regulator |
| LM2991J-QML |  338Kb/11P | Negative Low Dropout Adjustable Regulator |
| LM2991J-QML |  349Kb/12P | Negative Low Dropout Adjustable Regulator |
| LM2991J-QML |  688Kb/13P | Negative Low Dropout Adjustable Regulator |
| LM2991J-QMLV |  338Kb/11P | Negative Low Dropout Adjustable Regulator |
| LM2991J-QMLV |  349Kb/12P | Negative Low Dropout Adjustable Regulator |
| LM2991J-QMLV |  688Kb/13P | Negative Low Dropout Adjustable Regulator |
 National Semiconductor ... | LM2991S |  338Kb/11P | Negative Low Dropout Adjustable Regulator |
| LM2991S |  349Kb/12P | Negative Low Dropout Adjustable Regulator |