Overview
The LM1949N/NOPB is a linear integrated circuit designed by Texas Instruments to provide excellent control over fuel injector drive circuitry in modern automotive systems. This IC is specifically engineered to control an external power NPN Darlington transistor, which in turn drives the high current injector solenoid. It operates effectively across a wide temperature range and can handle low voltage supplies, making it suitable for various automotive applications, including fuel injection and throttle body injection systems.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Supply Voltage | 3 | - | 5.5 | V |
| Output Drive Current | - | 22 | - | mA |
| Input Voltage Range | -0.3 | - | VCC | V |
| Operating Temperature Range | -55 | - | 125 | °C |
| Storage Temperature Range | -65 | - | 150 | °C |
| Junction Temperature | - | - | 150 | °C |
| Power Dissipation | - | - | 1235 | mW |
| Input On Level (VCC = 5.5V) | 1.4 | 2.4 | - | V |
| Input Off Level (VCC = 5.5V) | 1.0 | 1.35 | - | V |
| Output Saturation Voltage (10 mA, VIN = 0V) | 0.2 | 0.4 | - | V |
Key Features
- Low Voltage Supply: Operates with supply voltages from 3V to 5.5V, making it suitable for use under various conditions, including cold crank scenarios.
- High Output Drive Current: Capable of delivering up to 22 mA of output drive current, ensuring robust control over the injector solenoid.
- No RFI Radiation: Designed to minimize radio frequency interference (RFI), which is crucial in automotive systems to avoid interference with other electronic components.
- TTL/CMOS Compatible Input Logic Levels: Compatible with both TTL and CMOS logic levels, enhancing its versatility in different system designs.
- Highly Accurate Operation: Provides highly accurate control over the injector current, ensuring precise fuel injection and optimal engine performance).
- Adaptable to All Injector Current Levels: Can be tailored to suit various types of injector solenoids, making it a flexible solution for different automotive applications).
Applications
- Fuel Injection Systems: Ideal for controlling fuel injectors in both open and closed loop systems, ensuring precise air-to-fuel mixture).
- Throttle Body Injection Systems: Suitable for throttle body injection systems, providing accurate control over the fuel flow).
- Solenoid Controls: Can be used to control various solenoids and valves in automotive systems, including air and fluid valves).
- DC Motor Drives: Applicable in DC motor drive circuits where precise current control is necessary).
Q & A
- What is the primary function of the LM1949N/NOPB IC?
The LM1949N/NOPB IC is designed to control fuel injector drive circuitry in modern automotive systems by driving an external power NPN Darlington transistor).
- What is the operating voltage range of the LM1949N/NOPB?
The IC operates with supply voltages from 3V to 5.5V).
- What is the maximum output drive current of the LM1949N/NOPB?
The IC can deliver up to 22 mA of output drive current).
- Is the LM1949N/NOPB compatible with TTL and CMOS logic levels?
- What are the typical applications of the LM1949N/NOPB?
- How does the LM1949N/NOPB handle RFI?
- What is the operating temperature range of the LM1949N/NOPB?
- How does the LM1949N/NOPB manage peak and hold currents?
- Can the LM1949N/NOPB be used in switching injector driver circuits?
- What is the significance of the zener diode in the LM1949N/NOPB circuit?
