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LM3420M5-8.4 Fiches technique(PDF) 10 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No de pièce LM3420M5-8.4
Description  Lithium-Ion Battery Charge Controller
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3420M5-8.4 Fiches technique(HTML) 10 Page - National Semiconductor (TI)

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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 250 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
250 unit increments on tape and reel
4.2V
A (Prime)
LM3420AM5X-4.2
D02A
3k unit increments on tape and reel
4.2V
B (Standard)
LM3420M5-4.2
D02B
250 unit increments on tape and reel
4.2V
B (Standard)
LM3420M5X-4.2
D02B
3k unit increments on tape and reel
8.2V
A (Prime)
LM3420AM5-8.2
D07A
250 unit increments on tape and reel
8.2V
A (Prime)
LM3420AM5X-8.2
D07A
3k unit increments on tape and reel
8.2V
B (Standard)
LM3420M5-8.2
D07B
250 unit increments on tape and reel
8.2V
B (Standard)
LM3420M5X-8.2
D07B
3k unit increments on tape and reel
8.4V
A (Prime)
LM3420AM5-8.4
D03A
250 unit increments on tape and reel
8.4V
A (Prime)
LM3420AM5X-8.4
D03A
3k unit increments on tape and reel
8.4V
B (Standard)
LM3420M5-8.4
D03B
250 unit increments on tape and reel
8.4V
B (Standard)
LM3420M5X-8.4
D03B
3k unit increments on tape and reel
12.6V
A (Prime)
LM3420AM5-12.6
D04A
250 unit increments on tape and reel
12.6V
A (Prime)
LM3420AM5X-12.6
D04A
3k unit increments on tape and reel
12.6V
B (Standard)
LM3420M5-12.6
D04B
250 unit increments on tape and reel
12.6V
B (Standard)
LM3420M5X-12.6
D04B
3k unit increments on tape and reel
16.8V
A (Prime)
LM3420AM5-16.8
D05A
250 unit increments on tape and reel
16.8V
A (Prime)
LM3420AM5X-16.8
D05A
3k unit increments on tape and reel
16.8V
B (Standard)
LM3420M5-16.8
D05B
250 unit increments on tape and reel
16.8V
B (Standard)
LM3420M5X-16.8
D05B
3k unit increments on tape and reel
FIGURE 1. SOT23-5 Marking
www.national.com
10


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