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LM3420M5X-12.6 Datasheet(PDF) 10 Page - National Semiconductor (TI) |
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LM3420M5X-12.6 Datasheet(HTML) 10 Page - National Semiconductor (TI) |
10 / 17 page Five Lead Surface Mount Package Information The small SOT23-5 package allows only 4 alphanumeric characters to identify the product. The table below contains the field in- formation marked on the package. The first letter “D” identifies the part as a Driver, the next two numbers indicate the voltage, “02” for a 4.2V part, “07” for an 8.2V part, “03” for an 8.4V part, “04” for a 12.6V part, and “05” for a 16.8V part. The fourth letter indicates the grade, “B” for standard grade, “A” for the prime grade. The SOT23-5 surface mount package is only available on tape in quantity increments of 1000 on tape and reel (indicated by the letters “M5” in the part number), or in quantity increments of 3000 on tape and reel (indicated by the letters “M5X” in the part num- ber). Product Description The LM3420 is a shunt regulator specifically designed to be the reference and control section in an overall feedback loop of a Lithium-Ion battery charger. The regulated output volt- age is sensed between the IN pin and GROUND pin of the LM3420. If the voltage at the IN pin is less than the LM3420 regulating voltage (V REG), the OUT pin sources no current. As the voltage at the IN pin approaches the V REG voltage, the OUT pin begins sourcing current. This current is then used to drive a feedback device (opto-coupler), or a power device (linear regulator, switching regulator, etc.), which ser- vos the output voltage to be the same value as V REG. In some applications, (even under normal operating condi- tions) the voltage on the IN pin can be forced above the V REG voltage. In these instances, the maximum voltage ap- plied to the IN pin should not exceed 20V. In addition, an ex- ternal resistor may be required on the OUT pin to limit the maximum current to 20 mA. Compensation The inverting input of the error amplifier is brought out to al- low overall closed-loop compensation. In many of the appli- cations circuits shown here, compensation is provided by a single capacitor (C C) connected from the compensation pin to the out pin of the LM3420. The capacitor values shown in the schematics are adequate under most conditions, but they can be increased or decreased depending on the de- sired loop response. Applying a load pulse to the output of a regulator circuit and observing the resultant output voltage response is an easy method of determining the stability of the control loop. Analyzing more complex feedback loops requires additional information. The formula for AC gain at a frequency (f) is as follows; where R f ≈ 75 kΩ for the 4.2V part, Rf ≈ 181 kΩ for the 8.4V part, R f ≈ 287 kΩ for the 12.6V part, and Rf ≈ 392 kΩ for the 16.8V part. The resistor (R f) in the formula is an internal resistor located on the die. Since this resistor value will affect the phase mar- gin, the worst case maximum and minimum values are im- Voltage Grade Order Package Supplied as Information Marking 4.2V A (Prime) LM3420AM5-4.2 D02A 1000 unit increments on tape and reel 4.2V A (Prime) LM3420AM5X-4.2 D02A 3000 unit increments on tape and reel 4.2V B (Standard) LM3420M5-4.2 D02B 1000 unit increments on tape and reel 4.2V B (Standard) LM3420M5X-4.2 D02B 3000 unit increments on tape and reel 8.2V A (Prime) LM3420AM5-8.2 D07A 1000 unit increments on tape and reel 8.2V A (Prime) LM3420AM5X-8.2 D07A 3000 unit increments on tape and reel 8.2V B (Standard) LM3420M5-8.2 D07B 1000 unit increments on tape and reel 8.2V B (Standard) LM3420M5X-8.2 D07B 3000 unit increments on tape and reel 8.4V A (Prime) LM3420AM5-8.4 D03A 1000 unit increments on tape and reel 8.4V A (Prime) LM3420AM5X-8.4 D03A 3000 unit increments on tape and reel 8.4V B (Standard) LM3420M5-8.4 D03B 1000 unit increments on tape and reel 8.4V B (Standard) LM3420M5X-8.4 D03B 3000 unit increments on tape and reel 12.6V A (Prime) LM3420AM5-12.6 D04A 1000 unit increments on tape and reel 12.6V A (Prime) LM3420AM5X-12.6 D04A 3000 unit increments on tape and reel 12.6V B (Standard) LM3420M5-12.6 D04B 1000 unit increments on tape and reel 12.6V B (Standard) LM3420M5X-12.6 D04B 3000 unit increments on tape and reel 16.8V A (Prime) LM3420AM5-16.8 D05A 1000 unit increments on tape and reel 16.8V A (Prime) LM3420AM5X-16.8 D05A 3000 unit increments on tape and reel 16.8V B (Standard) LM3420M5-16.8 D05B 1000 unit increments on tape and reel 16.8V B (Standard) LM3420M5X-16.8 D05B 3000 unit increments on tape and reel FIGURE 1. SOT23-5 Marking www.national.com 10 |
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