NATIONAL SEMICONDUCTOR LM1949 User's Manual
Summary
This specialized linear integrated circuit serves as a reliable Injector Drive Controller, designed primarily for modern automotive applications. It expertly manages high-current solenoid and fuel injector circuits using low voltage supplies (3V–5.5V). The IC ensures highly accurate power delivery through features like short-circuit protection and precise control of peak vs. holding currents, making it ideal for fuel injection, throttle body, and general solenoid controls, especially in 'cold crank' conditions. This manual provides comprehensive technical details, full performance specifications, typical application circuits, and operating guidelines for efficient system integration.
Manual Details
| Brand | National |
|---|---|
| Pages | 12 |
| File Size | 476.65 KB |
| Published | June 18, 2026 |
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Frequently Asked Questions
What voltage supplies are compatible with the LM1949 Injector Controller?
It is typically powered from a 5V ± 10% supply, but can be reliably operable over supplies as low as 3 volts.
Does the controller have built-in power protection features?
Yes, it features short circuit protection and includes an internal time-out function to dramatically reduce overall system power consumption.
What is the safe operating temperature range for this IC?
The electrical operating temperature range is −40˚C to +125˚C; storage is rated from −65˚C to +150˚C.
Is the LM1949 compatible with standard logic circuits?
Yes, the device supports TTL/CMOS compatible input logic levels.