NSC LM3420M5-16.8, LM3420M5-12.6, LM3420AM5X-4.2, LM3420AM5X-16.8, LM3420AM5-8.4 Datasheet
...
May 1998
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 respectively).
Included in a very small package is an (internally compensated) op amp, a bandgap reference, an NPN output transistor, and voltage setting resistors. The amplifier's inverting input 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 tolerance of 0.5% for the A grade version, and 1% for the standard 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
nVoltage options for charging 1, 2, 3 or 4 cells
nTiny SOT23-5 package
nPrecision (0.5%) end-of-charge control
nDrive capability for external power stage
nLow quiescent current, 85 µA (typ.)
Applications
nLithium-Ion battery charging
nSuitable 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.
Controller Charge Battery Ion-Lithium 8.16- 6,.12- 4,.8- 2,.8- 2,.4-LM3420
© 1999 National Semiconductor Corporation |
DS012359 |
www.national.com |
Connection Diagrams and Order Information
5-Lead Small Outline Package (M5)
Actual Size
DS012359-4
DS012359-3
*No internal connection, but should be soldered to PC board for best heat transfer.
Top View
For Ordering Information
See Figure 1 in this Data Sheet
See NS Package Number MA05B
www.national.com |
2 |
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.
Input Voltage V(IN) |
20V |
Output Current |
20 mA |
Junction Temperature |
150ÊC |
Storage Temperature |
−65ÊC to +150ÊC |
Lead Temperature |
|
Vapor Phase (60 seconds) |
+215ÊC |
Infrared (15 seconds) |
+220ÊC |
Power Dissipation (TA = 25ÊC) |
300 mW |
(Note 2) |
ESD Susceptibility (Note 3) |
|
Human Body Model |
1500V |
See AN-450 ªSurface Mounting Methods and Their Effect on Product Reliabilityº for methods on soldering surface-mount devices.
Operating Ratings (Notes 1, 2)
Ambient Temperature Range |
−40ÊC |
≤ TA ≤ +85ÊC |
Junction Temperature Range |
−40ÊC |
≤ TJ ≤ +125ÊC |
Output Current |
|
15 mA |
LM3420-4.2
Electrical Characteristics
Specifications with standard type face are for TJ = 25ÊC, 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-4.2 |
LM3420-4.2 |
Units |
|
|
|
(Note 4) |
Limit |
Limit |
(Limits) |
|
|
|
|
(Note 5) |
(Note 5) |
|
|
|
|
|
|
|
|
VREG |
Regulation Voltage |
IOUT = 1 mA |
4.2 |
|
|
V |
|
|
|
|
4.221/4.242 |
4.242/4.284 |
V(max) |
|
|
|
|
4.179/4.158 |
4.158/4.116 |
V(min) |
|
|
|
|
|
|
|
|
Regulation Voltage |
IOUT = 1 mA |
|
±0.5/± 1 |
±1/± 2 |
%(max) |
|
Tolerance |
|
|
|
|
|
|
|
|
|
|
|
|
Iq |
Quiescent Current |
IOUT = 1 mA |
85 |
|
|
µA |
|
|
|
|
110/115 |
125/150 |
µA(max) |
|
|
|
|
|
|
|
Gm |
Transconductance |
20 µA ≤ IOUT ≤ 1 mA |
3.3 |
|
|
mA/mV |
|
IOUT/ VREG |
VOUT = 2V |
|
1.3/0.75 |
1.0/0.50 |
mA/mV(min) |
|
|
1 mA ≤ IOUT ≤ 15 mA |
6.0 |
|
|
mA/mV |
|
|
VOUT = 2V |
|
3.0/1.5 |
2.5/1.4 |
mA/mV(min) |
AV |
Voltage Gain |
1V ≤ VOUT ≤ VREG − 1.2V (−1.3) |
1000 |
|
|
V/V |
|
VOUT/ VREG |
RL = 200Ω (Note 6) |
|
550/250 |
450/200 |
V/V(min) |
|
|
1V ≤ VOUT ≤ VREG − 1.2V (−1.3) |
3500 |
|
|
V/V |
|
|
RL = 2 kΩ |
|
1500/900 |
1000/700 |
V/V(min) |
VSAT |
Output Saturation |
V(IN) = VREG +100 mV |
1.0 |
|
|
V |
|
(Note 7) |
IOUT = 15 mA |
|
1.2/1.3 |
1.2/1.3 |
V(max) |
IL |
Output Leakage |
V(IN) = VREG −100 mV |
0.1 |
|
|
µA |
|
Current |
VOUT = 0V |
|
0.5/1.0 |
0.5/1.0 |
µA(max) |
Rf |
Internal Feedback |
|
75 |
|
|
kΩ |
|
Resistor (Note 8) |
|
|
94 |
94 |
kΩ(max) |
|
|
|
|
56 |
56 |
kΩ(min) |
|
|
|
|
|
|
|
En |
Output Noise |
IOUT = 1 mA, 10 Hz ≤ f ≤ 10 kHz |
70 |
|
|
µVRMS |
|
Voltage |
|
|
|
|
|
|
|
|
|
|
|
|
3 |
www.national.com |
LM3420-8.2
Electrical Characteristics
Specifications with standard type face are for TJ = 25ÊC, 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-8.2 |
LM3420-8.2 |
Units |
|
|
|
(Note 4) |
Limit |
Limit |
(Limits) |
|
|
|
|
(Note 5) |
(Note 5) |
|
|
|
|
|
|
|
|
VREG |
Regulation Voltage |
IOUT = 1 mA |
8.2 |
|
|
V |
|
|
|
|
8.241/8.282 |
8.282/8.364 |
V(max) |
|
|
|
|
8.159/8.118 |
8.118/8.036 |
V(min) |
|
|
|
|
|
|
|
|
Regulation Voltage |
IOUT = 1 mA |
|
±0.5/± 1 |
±1/± 2 |
%(max) |
|
Tolerance |
|
|
|
|
|
|
|
|
|
|
|
|
Iq |
Quiescent Current |
IOUT = 1 mA |
85 |
|
|
µA |
|
|
|
|
110/115 |
125/150 |
µA(max) |
|
|
|
|
|
|
|
Gm |
Transconductance |
20 µA ≤ IOUT ≤ 1 mA |
3.3 |
|
|
mA/mV |
|
IOUT/ VREG |
VOUT = 6V |
|
1.3/0.75 |
1.0/0.50 |
mA/mV(min) |
|
|
1 mA ≤ IOUT ≤ 15 mA |
6.0 |
|
|
mA/mV |
|
|
VOUT = 6V |
|
3.0/1.5 |
2.5/1.4 |
mA/mV(min) |
AV |
Voltage Gain |
1V ≤ VOUT ≤ VREG − 1.2V (−1.3) |
1000 |
|
|
V/V |
|
VOUT/ VREG |
RL = 470Ω (Note 6) |
|
550/250 |
450/200 |
V/V(min) |
|
|
1V ≤ VOUT ≤ VREG − 1.2V (−1.3) |
3500 |
|
|
V/V |
|
|
RL = 5 kΩ |
|
1500/900 |
1000/700 |
V/V(min) |
VSAT |
Output Saturation |
V(IN) = VREG +100 mV |
1.0 |
|
|
V |
|
(Note 7) |
IOUT = 15 mA |
|
1.2/1.3 |
1.2/1.3 |
V(max) |
IL |
Output Leakage |
V(IN) = VREG −100 mV |
0.1 |
|
|
µA |
|
Current |
VOUT = 0V |
|
0.5/1.0 |
0.5/1.0 |
µA(max) |
Rf |
Internal Feedback |
|
176 |
|
|
kΩ |
|
Resistor (Note 8) |
|
|
220 |
220 |
kΩ(max) |
|
|
|
|
132 |
132 |
kΩ(min) |
|
|
|
|
|
|
|
En |
Output Noise |
IOUT = 1 mA, 10 Hz ≤ f ≤ 10 kHz |
140 |
|
|
µVRMS |
|
Voltage |
|
|
|
|
|
|
|
|
|
|
|
|
LM3420-8.4
Electrical Characteristics
Specifications with standard type face are for TJ = 25ÊC, 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-8.4 |
LM3420-8.4 |
Units |
|
|
|
(Note 4) |
Limit |
Limit |
(Limits) |
|
|
|
|
(Note 5) |
(Note 5) |
|
|
|
|
|
|
|
|
VREG |
Regulation Voltage |
IOUT = 1 mA |
8.4 |
|
|
V |
|
|
|
|
8.442/8.484 |
8.484/8.568 |
V(max) |
|
|
|
|
8.358/8.316 |
8.316/8.232 |
V(min) |
|
|
|
|
|
|
|
|
Regulation Voltage |
IOUT = 1 mA |
|
±0.5/± 1 |
±1/± 2 |
%(max) |
|
Tolerance |
|
|
|
|
|
|
|
|
|
|
|
|
Iq |
Quiescent Current |
IOUT = 1 mA |
85 |
|
|
µA |
|
|
|
|
110/115 |
125/150 |
µA(max) |
|
|
|
|
|
|
|
Gm |
Transconductance |
20 µA ≤ IOUT ≤ 1 mA |
3.3 |
|
|
mA/mV |
|
IOUT/ VREG |
VOUT = 6V |
|
1.3/0.75 |
1.0/0.50 |
mA/mV(min) |
|
|
1 mA ≤ IOUT ≤ 15 mA |
6.0 |
|
|
mA/mV |
|
|
VOUT = 6V |
|
3.0/1.5 |
2.5/1.4 |
mA/mV(min) |
www.national.com |
4 |
LM3420-8.4
Electrical Characteristics (Continued)
Specifications with standard type face are for TJ = 25ÊC, 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-8.4 |
LM3420-8.4 |
Units |
|
|
|
(Note 4) |
Limit |
Limit |
(Limits) |
|
|
|
|
(Note 5) |
(Note 5) |
|
|
|
|
|
|
|
|
AV |
Voltage Gain |
1V ≤ VOUT ≤ VREG − 1.2V (−1.3) |
1000 |
|
|
V/V |
|
VOUT/ VREG |
RL = 470Ω (Note 6) |
|
550/250 |
450/200 |
V/V(min) |
|
|
1V ≤ VOUT ≤ VREG − 1.2V (−1.3) |
3500 |
|
|
V/V |
|
|
RL = 5 kΩ |
|
1500/900 |
1000/700 |
V/V(min) |
VSAT |
Output Saturation |
V(IN) = VREG +100 mV |
1.0 |
|
|
V |
|
(Note 7) |
IOUT = 15 mA |
|
1.2/1.3 |
1.2/1.3 |
V(max) |
IL |
Output Leakage |
V(IN) = VREG −100 mV |
0.1 |
|
|
µA |
|
Current |
VOUT = 0V |
|
0.5/1.0 |
0.5/1.0 |
µA(max) |
Rf |
Internal Feedback |
|
181 |
|
|
kΩ |
|
Resistor (Note 8) |
|
|
227 |
227 |
kΩ(max) |
|
|
|
|
135 |
135 |
kΩ(min) |
|
|
|
|
|
|
|
En |
Output Noise |
IOUT = 1 mA, 10 Hz ≤ f ≤ 10 kHz |
140 |
|
|
µVRMS |
|
Voltage |
|
|
|
|
|
|
|
|
|
|
|
|
LM3420-12.6
Electrical Characteristics
Specifications with standard type face are for TJ = 25ÊC, 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 |
|
|
V |
|
|
|
|
12.663/12.726 |
12.726/12.852 |
V(max) |
|
|
|
|
12.537/12.474 |
12.474/12.348 |
V(min) |
|
|
|
|
|
|
|
|
Regulation Voltage |
IOUT = 1 mA |
|
±0.5/± 1 |
±1/± 2 |
%(max) |
|
Tolerance |
|
|
|
|
|
|
|
|
|
|
|
|
Iq |
Quiescent Current |
IOUT = 1 mA |
85 |
|
|
µA |
|
|
|
|
110/115 |
125/150 |
µA(max) |
|
|
|
|
|
|
|
Gm |
Transconductance |
20 µA ≤ IOUT ≤ 1 mA |
3.3 |
|
|
mA/mV |
|
IOUT/ VREG |
VOUT = 10V |
|
1.3/0.75 |
1.0/0.5 |
mA/mV(min) |
|
|
1 mA ≤ IOUT ≤ 15 mA |
6.0 |
|
|
mA/mV |
|
|
VOUT = 10V |
|
3.0/1.5 |
2.5/1.4 |
mA/mV(min) |
AV |
Voltage Gain |
1V ≤ VOUT ≤ VREG − 1.2V (−1.3) |
1000 |
|
|
V/V |
|
VOUT/ VREG |
RL = 750Ω (Note 6) |
|
550/250 |
450/200 |
V/V(min) |
|
|
1V ≤ VOUT ≤ VREG − 1.2V (−1.3) |
3500 |
|
|
V/V |
|
|
RL = 10 kΩ |
|
1500/900 |
1000/700 |
V/V(min) |
VSAT |
Output Saturation |
V(IN) = VREG +100 mV |
1.0 |
|
|
V |
|
(Note 7) |
IOUT = 15 mA |
|
1.2/1.3 |
1.2/1.3 |
V(max) |
IL |
Output Leakage |
V(IN) = VREG −100 mV |
0.1 |
|
|
µA |
|
Current |
VOUT = 0V |
|
0.5/1.0 |
0.5/1.0 |
µA(max) |
Rf |
Internal Feedback |
|
287 |
|
|
kΩ |
|
Resistor (Note 8) |
|
|
359 |
359 |
kΩ(max) |
|
|
|
|
215 |
215 |
kΩ(min) |
|
|
|
|
|
|
|
En |
Output Noise |
IOUT = 1 mA, 10 Hz ≤ f ≤ 10 kHz |
210 |
|
|
µVRMS |
|
Voltage |
|
|
|
||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
5 |
www.national.com |
LM3420-16.8
Electrical Characteristics
Specifications with standard type face are for TJ = 25ÊC, 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-16.8 |
LM3420-16.8 |
Units |
|
|
|
(Note 4) |
Limit |
Limit |
(Limits) |
|
|
|
|
(Note 5) |
(Note 5) |
|
|
|
|
|
|
|
|
VREG |
Regulation Voltage |
IOUT = 1 mA |
16.8 |
|
|
V |
|
|
|
|
16.884/16.968 |
16.968/17.136 |
V(max) |
|
|
|
|
16.716/16.632 |
16.632/16.464 |
V(min) |
|
|
|
|
|
|
|
|
Regulation Voltage |
IOUT = 1 mA |
|
±0.5/± 1 |
±1/± 2 |
%(max) |
|
Tolerance |
|
|
|
|
|
|
|
|
|
|
|
|
Iq |
Quiescent Current |
IOUT = 1 mA |
85 |
|
|
µA |
|
|
|
|
110/115 |
125/150 |
µA(max) |
|
|
|
|
|
|
|
Gm |
Transconductance |
20 µA ≤ IOUT ≤ 1 mA |
3.3 |
|
|
mA/mV |
|
IOUT/ VREG |
VOUT = 15V |
|
0.8/0.4 |
0.7/0.35 |
mA/mV(min) |
|
|
1 mA ≤ IOUT ≤ 15 mA |
6.0 |
|
|
mA/mV |
|
|
VOUT = 15V |
|
2.9/0.9 |
2.5/0.75 |
mA/mV(min) |
AV |
Voltage Gain |
1V ≤ VOUT ≤ VREG − 1.2V (−1.3) |
1000 |
|
|
V/V |
|
VOUT/ VREG |
RL = 1 kΩ (Note 6) |
|
550/250 |
450/200 |
V/V(min) |
|
|
1V ≤ VOUT ≤ VREG − 1.2V (−1.3) |
3500 |
|
|
V/V |
|
|
RL = 15 kΩ |
|
1200/750 |
1000/650 |
V/V(min) |
VSAT |
Output Saturation |
V(IN) = VREG +100 mV |
1.0 |
|
|
V |
|
(Note 7) |
IOUT = 15 mA |
|
1.2/1.3 |
1.2/1.3 |
V(max) |
IL |
Output Leakage |
V(IN) = VREG −100 mV |
0.1 |
|
|
µA |
|
Current |
VOUT = 0V |
|
0.5/1.0 |
0.5/1.0 |
µA(max) |
Rf |
Internal Feedback |
|
392 |
|
|
kΩ |
|
Resistor (Note 8) |
|
|
490 |
490 |
kΩ(max) |
|
|
|
|
294 |
294 |
kΩ(min) |
|
|
|
|
|
|
|
En |
Output Noise |
IOUT = 1 mA, 10 Hz ≤ f ≤ 10 kHz |
280 |
|
|
µVRMS |
|
Voltage |
|
|
|
||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions.
Note 2: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJmax (maximum junction temperature), θJA (junction to ambient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any temperature is PDmax = (TJmax − T A)/θJA or the number given in the Absolute Maximum Ratings, whichever is lower. The typical thermal resistance (θJA) when soldered to a printed circuit board is approximately 306ÊC/W for the M5 package.
Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin.
Note 4: Typical numbers are at 25ÊC and represent the most likely parametric norm.
Note 5: Limits are 100% production tested at 25ÊC. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control (SQC) methods. The limits are used to calculate National's Averaging Outgoing Quality Level (AOQL).
Note 6: Actual test is done using equivalent current sink instead of a resistor load.
Note 7: VSAT = V(IN) − V OUT, when the voltage at the IN pin is forced 100 mV above the nominal regulating voltage (VREG).
Note 8: See Applications and Typical Performance Characteristics sections for information on this resistor.
www.national.com |
6 |
Loading...