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LM1949N/NOPB +BOM

Injector Drive Controller

Manufacturer:

Texas Instruments, Inc
Mfr.Part #:

LM1949N/NOPB
Datasheet:

LM1949N/NOPB Datasheet (PDF)
GenericPartNumber:

LM1949
PartDescription:

Injector Drive Controller
EDA/CAD Models:

Request Free CAD Models for LM1949N/NOPB

LM1949N/NOPB General Description

The LM1949 linear integrated circuit serves as an excellent control of fuel injector drive circuitry in modern automotive systems. The IC is designed to control an external power NPN Darlington transistor that drives the high current injector solenoid. The current required to open a solenoid is several times greater than the current necessary to merely hold it open; therefore, the LM1949, by directly sensing the actual solenoid current, initially saturates the driver until the “peak” injector current is four times that of the idle or “holding” current (–). This guarantees opening of the injector. The current is then automatically reduced to the sufficient holding level for the duration of the input pulse. In this way, the total power consumed by the system is dramatically reduced. Also, a higher degree of correlation of fuel to the input voltage pulse (or duty cycle) is achieved, since opening and closing delays of the solenoid will be reduced.

Normally powered from a 5V ± 10% supply, the IC is typically operable over the entire temperature range (−55°C to +125°C ambient) with supplies as low as 3 volts. This is particularly useful under “cold crank” conditions when the battery voltage may drop low enough to deregulate the 5-volt power supply.

The LM1949 is available in the plastic PDIP, (contact factory for other package options).

Key Features

Low Voltage Supply (3V–5.5V)
22 mA Output Drive Current
No RFI Radiation
Adaptable to All Injector Current Levels
Highly Accurate Operation
TTL/CMOS Compatible Input Logic Levels
Short Circuit Protection
High Impedance Input
Externally Set Holding Current, I_H
Internally Set Peak Current (4 × I_H)
Externally Set Time-Out
Can be Modified for Full Switching Operation
Available in Plastic 8-Pin PDIP

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Specifications

genericPartNumber	LM1949	orderablePartNumber	LM1949N/NOPB
partDescription	Injector Drive Controller	statusDisplay	ACTIVE
statusDescription	This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.