Key facts
- Model
- LM194
- Category
- Other Electronics
- Documents
- 2
- Languages
- EN
- Last added
- 2012-05-09
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National Semiconductor LM1949 Datasheet
The LM1949 is a linear integrated circuit designed to control fuel injector drive circuitry in automotive systems. It senses the solenoid current, drives an external NPN Darlington transistor to a peak current four times the hold current, then reduces to the holding level for the duration of the input pulse, improving efficiency and reducing power consumption.
The document provides electrical characteristics, absolute maximum ratings, typical performance curves, application hints, physical dimensions, and packaging information. It also includes a life‑support policy disclaimer and ordering details for the mini‑DIP and dual‑in‑line packages.
National Semiconductor LM194 specifications
| Operating Temperature Range | -55 °C to +125 °C |
|---|---|
| Peak Output Current (max) | 54 mA |
| Hold Output Current (max) | 26 mA |
| Package | 8‑pin plastic mini‑DIP (LM1949M) or dual‑in‑line (LM1949N) |
| Peak‑to‑Hold Current Ratio | 4 × hold current |
All National Semiconductor LM194 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
How does the LM1949 control injector current?
The IC senses the solenoid current, drives the external transistor to a peak current four times the hold current, then automatically reduces to the hold level for the pulse duration.
What is the maximum peak output current of the LM1949?
The peak output current can reach up to 54 mA as specified in the electrical characteristics.
What is the offset voltage drift specification?
Offset voltage drift is specified as less than 0.1 mV per °C.
From: National Semiconductor LM194/LM394 Supermatch Pair Datasheet