NSC LM3420M5-16.8, LM3420M5-12.6, LM3420AM5X-4.2, LM3420AM5X-16.8, LM3420AM5-8.4 Datasheet

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 fivefixedvoltage 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

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

LM3420-4.2, -8.2, -8.4, -12.6, -16.8 Lithium-Ion Battery Charge Controller

May 1998

Typical Application and Functional Diagram

DS012359-1

Typical Constant Current/Constant Voltage

SIMPLE SWITCHER®is a registered trademark of National Semiconductor Corporation.

© 1999 National Semiconductor Corporation DS012359 www.national.com

Li-Ion Battery Charger

DS012359-2

LM3420 Functional Diagram

Connection Diagrams and Order Information

5-Lead Small Outline Package (M5)

Actual Size

DS012359-4

*No internal connection, but should be soldered to PC board for best heat
transfer.

DS012359-3

Top View

For Ordering Information

See

Figure 1

See NS Package Number MA05B

in this Data Sheet

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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 150˚C
Storage Temperature −65˚C to +150˚C
Lead Temperature

Vapor Phase (60 seconds) +215˚C

ESD Susceptibility (Note 3)

Human Body Model 1500V

See AN-450 “Surface Mounting Methods and Their Effect
on Product Reliability” for methods on soldering
surface-mount devices.

Operating Ratings (Notes 1, 2)

Ambient Temperature Range −40˚C ≤ T
Junction Temperature Range −40˚C ≤ T
Output Current 15 mA

≤ +85˚C

A

≤ +125˚C

J

Infrared (15 seconds) +220˚C

=

Power Dissipation (T

(Note 2) 300 mW

25˚C)

A

LM3420-4.2
Electrical Characteristics

Specifications with standard type face are for T

ture Range. Unless otherwise specified, V(IN)=V

Symbol Parameter Conditions Typical LM3420A-4.2 LM3420-4.2 Units

V

REG

Regulation Voltage I

Regulation Voltage I

OUT

OUT

=

=

Tolerance

I

q

G

Quiescent Current I

Transconductance 20 µA ≤ I

m

∆I

/∆V

OUT

REG

=

OUT

=

V

OUT

1mA≤I

=

V

A

V

Voltage Gain 1V ≤ V
∆V

/∆V

OUT

REG

OUT

=

R

200Ω (Note 6) 550/250 450/200 V/V(min)

L

1V ≤ V

=

R

2kΩ 1500/900 1000/700 V/V(min)

OUT

L

OUT

=

=

V

SAT

Output Saturation V(IN)=V
(Note 7) I

I

L

Output Leakage V(IN)=V
Current V

R

f

Internal Feedback 75 kΩ
Resistor (Note 8) 94 94 kΩ(max)

E

n

Output Noise I

OUT

=

Voltage

=

25˚C, and those with boldface type apply over full Operating Tempera-

J

REG,VOUT

=

1.5V.

(Note 4) Limit Limit (Limits)

(Note 5) (Note 5)

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)

1mA

±

0.5/±1

±1/±

2

%

(max)

1mA 85 µA

110/115 125/150 µA(max)

≤ 1 mA 3.3 mA/mV

OUT

2V 1.3/0.75 1.0/0.50 mA/mV(min)

≤ 15 mA 6.0 mA/mV

OUT

2V 3.0/1.5 2.5/1.4 mA/mV(min)

≤ V

OUT

OUT

REG

− 1.2V (−1.3) 1000 V/V

REG

≤ V

− 1.2V (−1.3) 3500 V/V

REG

+100 mV 1.0 V

15 mA 1.2/1.3 1.2/1.3 V(max)

−100 mV 0.1 µA

REG

0V 0.5/1.0 0.5/1.0 µA(max)

56 56 kΩ(min)

1 mA, 10 Hz ≤ f ≤ 10 kHz 70 µV

RMS

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LM3420-8.2
Electrical Characteristics

Specifications with standard type face are for T

ture Range. Unless otherwise specified, V(IN)=V

Symbol Parameter Conditions Typical LM3420A-8.2 LM3420-8.2 Units

V

REG

Regulation Voltage I

Regulation Voltage I

OUT

OUT

=

=

Tolerance

I

q

G

Quiescent Current I

Transconductance 20 µA ≤ I

m

∆I

/∆V

OUT

REG

=

OUT

=

V

OUT

1mA≤I

=

V

A

V

Voltage Gain 1V ≤ V
∆V

/∆V

OUT

REG

OUT

=

R

470Ω (Note 6) 550/250 450/200 V/V(min)

L

1V ≤ V

=

R

5kΩ 1500/900 1000/700 V/V(min)

OUT

L

OUT

=

=

V

SAT

Output Saturation V(IN)=V
(Note 7) I

I

L

Output Leakage V(IN)=V
Current V

R

f

Internal Feedback 176 kΩ
Resistor (Note 8) 220 220 kΩ(max)

E

n

Output Noise I

OUT

=

Voltage

=

25˚C, and those with boldface type apply over full Operating Tempera-

J

REG,VOUT

=

1.5V.

(Note 4) Limit Limit (Limits)

(Note 5) (Note 5)

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)

1mA

±

0.5/±1

±1/±

2

%

(max)

1mA 85 µA

110/115 125/150 µA(max)

≤ 1 mA 3.3 mA/mV

OUT

6V 1.3/0.75 1.0/0.50 mA/mV(min)

≤ 15 mA 6.0 mA/mV

OUT

6V 3.0/1.5 2.5/1.4 mA/mV(min)

≤ V

OUT

OUT

REG

− 1.2V (−1.3) 1000 V/V

REG

≤ V

− 1.2V (−1.3) 3500 V/V

REG

+100 mV 1.0 V

15 mA 1.2/1.3 1.2/1.3 V(max)

−100 mV 0.1 µA

REG

0V 0.5/1.0 0.5/1.0 µA(max)

132 132 kΩ(min)

1 mA, 10 Hz ≤ f ≤ 10 kHz 140 µV

RMS

LM3420-8.4
Electrical Characteristics

Specifications with standard type face are for T

ture Range. Unless otherwise specified, V(IN)=V

Symbol Parameter Conditions Typical LM3420A-8.4 LM3420-8.4 Units

V

REG

Regulation Voltage I

Regulation Voltage I

OUT

OUT

=

=

Tolerance

I

q

G

Quiescent Current I

Transconductance 20 µA ≤ I

m

∆I

/∆V

OUT

REG

=

OUT

=

V

OUT

1mA≤I

=

V

OUT

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=

25˚C, and those with boldface type apply over full Operating Tempera-

J

REG,VOUT

=

1.5V.

(Note 4) Limit Limit (Limits)

(Note 5) (Note 5)

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)

1mA

±

0.5/±1

±1/±

2

%

1mA 85 µA

110/115 125/150 µA(max)

≤ 1 mA 3.3 mA/mV

OUT

6V 1.3/0.75 1.0/0.50 mA/mV(min)

≤ 15 mA 6.0 mA/mV

OUT

6V 3.0/1.5 2.5/1.4 mA/mV(min)

(max)

LM3420-8.4
Electrical Characteristics

Specifications with standard type face are for T

ture Range. Unless otherwise specified, V(IN)=V

Symbol Parameter Conditions Typical LM3420A-8.4 LM3420-8.4 Units

A

V

V

SAT

I

L

R

f

E

n

Voltage Gain 1V ≤ V
∆V

OUT

/∆V

REG

R

L

1V ≤ V
R

L

Output Saturation V(IN)=V
(Note 7) I

OUT

Output Leakage V(IN)=V
Current V

OUT

Internal Feedback 181 kΩ
Resistor (Note 8) 227 227 kΩ(max)

Output Noise I

OUT

Voltage

(Continued)

=

25˚C, and those with boldface type apply over full Operating Tempera-

J

REG,VOUT

=

1.5V.

(Note 4) Limit Limit (Limits)

(Note 5) (Note 5)

≤ V

OUT

=

470Ω (Note 6) 550/250 450/200 V/V(min)

OUT

=

5kΩ 1500/900 1000/700 V/V(min)

=

15 mA 1.2/1.3 1.2/1.3 V(max)

=

0V 0.5/1.0 0.5/1.0 µA(max)

− 1.2V (−1.3) 1000 V/V

REG

≤ V

− 1.2V (−1.3) 3500 V/V

REG

+100 mV 1.0 V

REG

−100 mV 0.1 µA

REG

135 135 kΩ(min)

=

1 mA, 10 Hz ≤ f ≤ 10 kHz 140 µV

RMS

LM3420-12.6
Electrical Characteristics

Specifications with standard type face are for T

Range. Unless otherwise specified, V(IN)=V

Symbol Parameter Conditions Typical LM3420A-12.6 LM3420-12.6 Units

V

REG

Regulation Voltage I

Regulation Voltage I

OUT

OUT

=

=

Tolerance

I

q

G

m

Quiescent Current I

Transconductance 20 µA ≤ I
∆I

/∆V

OUT

REG

=

OUT

=

V

OUT

1mA≤I

=

V

A

V

Voltage Gain 1V ≤ V
∆V

/∆V

OUT

REG

OUT

=

R

750Ω (Note 6) 550/250 450/200 V/V(min)

L

1V ≤ V

=

R

10 kΩ 1500/900 1000/700 V/V(min)

OUT

L

OUT

=

=

V

SAT

Output Saturation V(IN)=V
(Note 7) I

I

L

Output Leakage V(IN)=V
Current V

R

f

Internal Feedback 287 kΩ
Resistor (Note 8) 359 359 kΩ(max)

E

n

Output Noise
Voltage

=

I

OUT

=

25˚C, and those with boldface type apply over full Operating Temperature

J

REG,VOUT

=

1.5V.

(Note 4) Limit Limit (Limits)

(Note 5) (Note 5)

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)

1mA

±

0.5/±1

±1/±

2

%

(max)

1mA 85 µA

110/115 125/150 µA(max)

≤ 1 mA 3.3 mA/mV

OUT

10V 1.3/0.75 1.0/0.5 mA/mV(min)

≤ 15 mA 6.0 mA/mV

OUT

10V 3.0/1.5 2.5/1.4 mA/mV(min)

≤ V

OUT

OUT

REG

− 1.2V (−1.3) 1000 V/V

REG

≤ V

− 1.2V (−1.3) 3500 V/V

REG

+100 mV 1.0 V

15 mA 1.2/1.3 1.2/1.3 V(max)

−100 mV 0.1 µA

REG

0V 0.5/1.0 0.5/1.0 µA(max)

215 215 kΩ(min)

1 mA, 10 Hz ≤ f ≤ 10 kHz

210 µV

RMS

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LM3420-16.8
Electrical Characteristics

Specifications with standard type face are for T

Range. Unless otherwise specified, V(IN)=V

Symbol Parameter Conditions Typical LM3420A-16.8 LM3420-16.8 Units

V

Regulation Voltage I

REG

Regulation Voltage I

OUT

OUT

=

=

Tolerance

I

q

G

Quiescent Current I

Transconductance 20 µA ≤ I

m

∆I

/∆V

OUT

REG

=

OUT

=

V

OUT

1mA≤I

=

V

A

Voltage Gain 1V ≤ V

V

∆V

/∆V

OUT

REG

OUT

=

R

1kΩ(Note 6) 550/250 450/200 V/V(min)

L

1V ≤ V

=

R

15 kΩ 1200/750 1000/650 V/V(min)

OUT

L

OUT

=

=

V

Output Saturation V(IN)=V

SAT

(Note 7) I

I

L

Output Leakage V(IN)=V
Current V

R

Internal Feedback 392 kΩ

f

Resistor (Note 8) 490 490 kΩ(max)

E

Output Noise

n

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 T
bient thermal resistance), and T
given in the Absolute Maximum Ratings, whichever is lower. The typical thermal resistance (θ
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 25˚C and represent the most likely parametric norm.
Note 5: Limits are 100%production tested at 25˚C. 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: V
Note 8: See Applications and Typical Performance Characteristics sections for information on this resistor.

SAT

=

V(IN) − V

(ambient temperature). The maximum allowable power dissipation at any temperature is P

A

, when the voltage at the IN pin is forced 100 mV above the nominal regulating voltage (V

OUT

=

I

OUT

=

25˚C, and those with boldface type apply over full Operating Temperature

J

REG,VOUT

=

1.5V.

(Note 4) Limit Limit (Limits)

(Note 5) (Note 5)

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)

1mA

±

0.5/±1

±1/±

2

%

(max)

1mA 85 µA

110/115 125/150 µA(max)

≤ 1 mA 3.3 mA/mV

OUT

15V 0.8/0.4 0.7/0.35 mA/mV(min)

≤ 15 mA 6.0 mA/mV

OUT

15V 2.9/0.9 2.5/0.75 mA/mV(min)

≤ V

OUT

OUT

REG

− 1.2V (−1.3) 1000 V/V

REG

≤ V

− 1.2V (−1.3) 3500 V/V

REG

+100 mV 1.0 V

15 mA 1.2/1.3 1.2/1.3 V(max)

−100 mV 0.1 µA

REG

0V 0.5/1.0 0.5/1.0 µA(max)

294 294 kΩ(min)

1 mA, 10 Hz ≤ f ≤ 10 kHz

280 µV

(maximum junction temperature), θJA(junction to am-

Jmax

) when soldered to a printed circuit board is approximately 306˚C/W

JA

REG

Dmax

).

=

(T

Jmax−TA

)/θJAor the number

RMS

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