Texas Instruments LM3620 Schematics
OBSOLETE
LM3620
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LM3620 Lithium-Ion Battery Charger Controller
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1
FEATURES
2
• Voltage Options for Charging 1 or 2 Cell
Stacks
• Adjustable Output Voltage for Coke or
Graphite Anodes
• Precision End-of-Charge Voltage Control
• Wide Input Voltage Range (4V to 30V)
• Low Off State Current (<10nA)
• Drive Provided for External Power Stage
• Tiny SOT-23 Package
SNVS025D –JUNE 1999–REVISED APRIL 2013
DESCRIPTION
The LM3620 series of controllers are monolithic
integrated circuits designed to control the charging
and end-of-charge control for lithium-ion rechargeable
batteries. The LM3620 is available in two versions for
one or two cell charger applications. Each version
provides the option of selecting the appropriate
termination voltage for either coke or graphite anode
lithium cells.
The LM3620 can operate from a wide range of DC
input sources (4V to 30V). With no charger supply
connected, the controller draws a quiescent current of
only 10nA to minimize discharging of a connected
battery pack.
The LM3620 consists of an operational
transconductance amplifier, a bandgap voltage
reference, a NPN driver transistor and precision
voltage setting resistors. The output of the amplifier is
made available to drive an external power transistor if
higher drive currents are required.
With a trimmed output voltage regulation of ±1.2%
initial accuracy, the LM3620 provides a simple,
precise solution for end-of-charge control of lithiumion rechargeable cells.
The LM3620 is packaged in a miniature 5-lead SOT23 surface mount package for very compact designs.
1
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 1999–2013, Texas Instruments Incorporated
LM3620
OBSOLETE
SNVS025D –JUNE 1999–REVISED APRIL 2013
Typical Application
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Connection Diagram
The small physical size of the SOT23-5 Package does not allow for the full part number marking. Devices will be
marked with the designation shown in the column Package Marking.
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
Figure 1. 5-Lead SOT23-5 Surface Mount Package
See Package MF05A
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OBSOLETE
LM3620
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ABSOLUTE MAXIMUM RATINGS
Input Voltage (V
V
EXT
) 35V
DRIVE
(1)(2)
SNVS025D –JUNE 1999–REVISED APRIL 2013
1.5V
Junction Temperature 150°C
Storage Temperature −65 to +150°C
Lead Temp. Soldering Vapor Phase (60 sec.) 215°C
Infrared (15 sec.) 220°C
Power Dissipation (TA= 25°C)
ESD Susceptibility
(4)
(3)
300mW
2000V
(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 ensure specific performance limits. For ensured specifications and test
conditions, see the Electrical Characteristics.
(2) If Military/Aerospace specified devices are required, please contact the TI Sales Office/ Distributors for availability and specifications.
(3) The maximum power dissipation must be derated at elevated temperatures and is limited by T
(junction-to-ambient thermal resistance) and TA(ambient temperature). The maximum power dissipation at any temperature is:
PDiss
(4) Rating is for the human body model, a 100 pF capacitor discharged through a 1.5kΩ resistor into each pin.
OPERATING RATINGS
MAX
= (T
JMAX
− TA)/θ
up to the value listed in the Absolute Maximum Ratings.
J-A
(1)
(maximum junction temperature), θ
JMAX
Ambient Temp. Range 0°C to 70°C
Junction Temp. Range 0°C to 125°C
Thermal Resistance(Junction to Ambient, θ
Input Voltage (V
) 4V to 30V
DRIVE
) 280°C/W
J-A
(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 ensure specific performance limits. For ensured specifications and test
conditions, see the Electrical Characteristics.
J-A
ELECTRICAL CHARACTERISTICS LM3620-4
V
= 5V, I
DRIVE
limits with standard typeface apply for TA= 25°C.
Symbol Parameter Conditions Typical Limit Units
V
REG
V
REG/VDRIVE
I
Q
I
OFF
I
DRIVE
Gm
(DRIVE)
I
EXT
(1) Quiescent current is all current flowing to ground when the voltage at the V
(V
).
REG
(2) Off current is all of the current flowing to ground including all leakage current that would be drawn from the battery connected to the
V
terminal.
REG
(3) When the External pin is being used as the driving source, it is recommended to keep the operating point of V
1V, the internal circuitry would bias I
the device.
= 2mA. Limits with boldface type apply over the full operating ambient temperature range, 0°C to +70°C,
DRIVE
Regulated Output Voltage (pin 1 to Pin 5 shorted to pin 1 (graphite anode) 4.1 4.051/4.018 V(min)
ground)
4.149/4.182 V(max)
Pin 5 open (coke anode) 4.2 4.150/4.116 V(min)
4.250/4.284 V(max)
Regulated Output Voltage Either Pin 5 setting ±1.2/±2.0 %
Tolerance
Supply Sensitivity V
Quiescent Current V
Off State Current V
Drive Pin Sink Current V
Drive Pin Transconductance ΔI
External Pin Source Current V
to conduct up to the current limit level continuously causing unnecessary power dissipation in
DRIVE
for 5V ≤ V
REG
= 4.5V, V
REG
open circuited
DRIVE
= 5.0V 20 15 mA(min)
DRIVE
/ΔV
DRIVE
2mA ≤ I
EXT
DRIVE
= 1V
REG
(3)
≤ 30V 100 µV/V(max)
DRIVE
EXT
≤15mA
= 1.0V
(2)
(1)
400 750 µA(max)
10 200 nA(max)
3 A/V
3 2.5 mA(min)
pin is forced to be above the nominal regulating voltage
REG
≤ 1V. If greater than
EXT
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