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LM193UH-883, LM1946, LM1949

Table of contents:
Info of LM193UH-883
Info of LM1946
Info of LM1949

LM193UH-883, LM1946, LM1949 Selling Leads, Datasheet

MFG:NS Package Cooled:SOP D/C:04+

LM193UH-883, LM1946, LM1949 Datasheet download

Five Points

Part Number: LM193UH-883

MFG: NS

Package Cooled: SOP

D/C: 04+

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LM1946 General Description

The LM1946 provides the industrial or automotive system designer with over or under current limit detection superior
to that of ordinary transistor or comparator-based circuits.

Each of the five independent comparators can be used to monitor a separate load as either an over current or under
current limit detector. Two comparators monitoring a single load can function as a current window monitor.

Current is sensed by monitoring the voltage drop across the wiring harness, pc board trace, or external sense resistor that feeds the load.

Provisions for compensating the user set limits for wiring harness resistance variations over temperature and supply voltage variations are also available.

When a limit is reached in one of the comparators, it turns on its output which can drive an external LED or microprocessor.

One side of the load can be grounded (not possible with ordinary comparator designs), which is important for automotive systems

LM1946 Maximum Ratings

If Military/Aerospace specified devices are required,please contact the National Semiconductor Sales office/Distributors for availability and specifications.
Supply Voltage (V_CC and Input Pins)
     Survival Voltage (T 100 ms)             -50V to+60V
     Operational Voltage                                9V to 26V
Internal Power Dissipation (Note 1)         Internally Limited
Output Short Circuit to Ground or V_CC         Continuous
Operating Temperature Range (TA)          -40 to +85
Maximum Junction Temperature                    +150
Storage Temperature Range                   -65 to +150
Lead Temperature (Soldering, 10 sec.)          +260
ESD Susceptibility (Note 3)                              600V

LM1946 Features

· Five independent comparators
· Capable of 20 mA per output
· Low power drain
· User set input threshold voltages
· Reverse battery protection
· 60V load dump protection on supply and all inputs
· Input common mode range exceeds V_CC
· Short circuit protection
· Thermal overload protection
· Prove-out test pin
· Available in plastic DIP and SO packages

LM1946 Typical Application

· Lamp fault detector
· Motor stall detector
· Power supply bus monitoring

LM1949 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 miniDIP, (contact factory for other package options).

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM1949 MDC	SLM	0	42786	0	0	3352500	2	951281028
LM1949N	SLM	0	42786	0	0	3352500	2	951281028

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

More Application Notes

Title	Size in Kbytes	Date
AN-222: Application Note 222 Super Matched Bipolar Transistor Pair Sets New Standards for Drift and Noise	399 Kbytes	1-Oct-02	Download

If you have trouble printing or viewing PDF file(s), see Printing Problems.

LM1949 Maximum Ratings

Drivers	1
Temperature Min	-55 deg C
Temperature Max	125 deg C
View Using Catalog

LM1949 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 c I_H)
Externally set time-out
Can be modified for full switching operation
Available in plastic 8-pin miniDIP

LM1949 Typical Application

Fuel injection
Throttle body injection
Solenoid controls
Air and fluid valves
DC motor drives

LM1949 Connection Diagram

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