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PDF LM3420-12.6 Data sheet ( Hoja de datos )
| Número de pieza | LM3420-12.6 | |
| Descripción | Lithium-Ion Battery Charge Controller | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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July 2000
LM3420-4.2, -8.2, -8.4, -12.6, -16.8
Lithium-Ion Battery Charge Controller
General Description
The LM3420 series of controllers are monolithic integrated
circuits designed for charging and end-of-charge control for
Lithium-Ion rechargeable batteries. The LM3420 is available
in five fixed voltage versions for one through four cell charger
applications (4.2V, 8.2V/8.4V, 12.6V and 16.8V respec-
tively).
Included in a very small package is an (internally compen-
sated) op amp, a bandgap reference, an NPN output transis-
tor, and voltage setting resistors. The amplifier’s inverting in-
put is externally accessible for loop frequency
compensation. The output is an open-emitter NPN transistor
capable of driving up to 15 mA of output current into external
circuitry.
A trimmed precision bandgap reference utilizes temperature
drift curvature correction for excellent voltage stability over
the operating temperature range. Available with an initial tol-
erance of 0.5% for the A grade version, and 1% for the stan-
dard version, the LM3420 allows for precision end-of-charge
control for Lithium-Ion rechargeable batteries.
The LM3420 is available in a sub-miniature 5-lead SOT23-5
surface mount package thus allowing very compact designs.
Features
n Voltage options for charging 1, 2, 3 or 4 cells
n Tiny SOT23-5 package
n Precision (0.5%) end-of-charge control
n Drive capability for external power stage
n Low quiescent current, 85 µA (typ.)
Applications
n Lithium-Ion battery charging
n Suitable for linear and switching regulator charger
designs
Typical Application and Functional Diagram
DS012359-1
Typical Constant Current/Constant Voltage
Li-Ion Battery Charger
DS012359-2
LM3420 Functional Diagram
SIMPLE SWITCHER® is a registered trademark of National Semiconductor Corporation.
© 2000 National Semiconductor Corporation DS012359
www.national.com
1 page  
LM3420-8.4
Electrical Characteristics (Continued)
Specifications with standard type face are for TJ = 25˚C, and those with boldface type apply over full Operating Tempera-
ture Range. Unless otherwise specified, V(IN) = VREG, VOUT = 1.5V.
Symbol
Parameter
Conditions
Typical LM3420A-8.4 LM3420-8.4
Units
(Note 4)
Limit
Limit
(Limits)
(Note 5)
(Note 5)
AV
VSAT
IL
Rf
Voltage Gain
∆VOUT/∆VREG
Output Saturation
(Note 7)
Output Leakage
Current
Internal Feedback
Resistor (Note 8)
1V ≤ VOUT ≤ VREG − 1.2V (−1.3)
RL = 470Ω (Note 6)
1V ≤ VOUT ≤ VREG − 1.2V (−1.3)
RL = 5 kΩ
V(IN) = VREG +100 mV
IOUT = 15 mA
V(IN) = VREG −100 mV
VOUT = 0V
1000
3500
1.0
0.1
181
550/250
1500/900
1.2/1.3
0.5/1.0
227
450/200
1000/700
1.2/1.3
0.5/1.0
227
V/V
V/V(min)
V/V
V/V(min)
V
V(max)
µA
µA(max)
kΩ
kΩ(max)
135 135 kΩ(min)
En Output Noise
Voltage
IOUT = 1 mA, 10 Hz ≤ f ≤ 10 kHz
140
µVRMS
LM3420-12.6
Electrical Characteristics
Specifications with standard type face are for TJ = 25˚C, and those with boldface type apply over full Operating Temperature
Range. Unless otherwise specified, V(IN) = VREG, VOUT = 1.5V.
Symbol
Parameter
Conditions
Typical LM3420A-12.6 LM3420-12.6
Units
(Note 4)
Limit
Limit
(Limits)
(Note 5)
(Note 5)
VREG
Regulation Voltage IOUT = 1 mA
12.6
12.663/12.726 12.726/12.852
V
V(max)
12.537/12.474 12.474/12.348
V(min)
Regulation Voltage
Tolerance
IOUT = 1 mA
±0.5/±1
±1/±2
%(max)
Iq Quiescent Current IOUT = 1 mA
85 µA
110/115
125/150
µA(max)
Gm
AV
VSAT
IL
Rf
Transconductance
∆IOUT/∆VREG
Voltage Gain
∆VOUT/∆VREG
Output Saturation
(Note 7)
Output Leakage
Current
Internal Feedback
Resistor (Note 8)
20 µA ≤ IOUT ≤ 1 mA
VOUT = 10V
1 mA ≤ IOUT ≤ 15 mA
VOUT = 10V
1V ≤ VOUT ≤ VREG − 1.2V (−1.3)
RL = 750Ω (Note 6)
1V ≤ VOUT ≤ VREG − 1.2V (−1.3)
RL = 10 kΩ
V(IN) = VREG +100 mV
IOUT = 15 mA
V(IN) = VREG −100 mV
VOUT = 0V
3.3
6.0
1000
3500
1.0
0.1
287
1.3/0.75
3.0/1.5
550/250
1500/900
1.2/1.3
0.5/1.0
359
1.0/0.5
2.5/1.4
450/200
1000/700
1.2/1.3
0.5/1.0
359
mA/mV
mA/mV(min)
mA/mV
mA/mV(min)
V/V
V/V(min)
V/V
V/V(min)
V
V(max)
µA
µA(max)
kΩ
kΩ(max)
215 215 kΩ(min)
En Output Noise
Voltage
IOUT = 1 mA, 10 Hz ≤ f ≤ 10 kHz
210
µVRMS
5 www.national.com
5 Page 
Compensation (Continued)
portant when analyzing closed loop stability. The minimum
and maximum room temperature values of this resistor are
specified in the Electrical Characteristics section of this data
sheet, and a curve showing the temperature coefficient is
shown in the curves section. Minimum values of Rf result in
lower phase margins.
Test Circuit
The test circuit shown in Figure 2 can be used to measure
and verify various LM3420 parameters. Test conditions are
set by forcing the appropriate voltage at the VOUT Set test
point and selecting the appropriate RL or IOUT as specified in
the Electrical Characteristics section. Use a DVM at the
“measure” test points to read the data.
FIGURE 2. LM3420 Test Circuit
VREG External Voltage Trim
The regulation voltage (VREG) of the LM3420 can be exter-
nally trimmed by adding a single resistor from the COMP pin
to the +IN pin or from the COMP pin to the GND pin, depend-
ing on the desired trim direction. Trim adjustments up to
±10% of VREG can be realized, with only a small increase in
the temperature coefficient. (See temperature coefficient
curve shown in Figure 3 below.)
DS012359-7
DS012359-9
Increasing VREG
DS012359-8
Normalized Temperature Drift with
Output Externally Trimmed
DS012359-10
Decreasing VREG
FIGURE 4. Changing VREG
Formulas for selecting trim resistor values are shown below,
based on the percent of increase (%incr) or percent of de-
crease (%decr) of the output voltage from the nominal volt-
age.
For LM3420-4.2
Rincrease = 22x105/%incr
Rdecrease = (53x105/%decr) − 75x103
For LM3420-8.2
11 www.national.com
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| PDF Descargar | [ Datasheet LM3420-12.6.PDF ] | |
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