Texas Instruments LM3620 Schematics

OBSOLETE

LM3620

www.ti.com

LM3620 Lithium-Ion Battery Charger Controller

Check for Samples: LM3620

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

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2All trademarks are the property of their respective owners.

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

www.ti.com

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

2 Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated

Product Folder Links: LM3620

OBSOLETE

LM3620

www.ti.com

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

Copyright © 1999–2013, Texas Instruments Incorporated Submit Documentation Feedback 3

Product Folder Links: LM3620

LM3620

OBSOLETE

SNVS025D –JUNE 1999–REVISED APRIL 2013

ELECTRICAL CHARACTERISTICS LM3620-4 (continued)

V

DRIVE

= 5V, I

= 2mA. Limits with boldface type apply over the full operating ambient temperature range, 0°C to +70°C,

DRIVE

limits with standard typeface apply for TA= 25°C.

Symbol Parameter Conditions Typical Limit Units

Gm

R

R

(EXT)

IN

F

External Pin Transconductance ΔI

V

Input Resistance Pin 1 to Ground. 46 kΩ

REG

/ΔV

, V

EXT

0mA ≤ I

REG

EXT

Circuit biased with V
V

open circuited 42 MΩ

DRIVE

EXT

≤ 2.5mA

= 1V

DRIVE

0.8 A/V

applied

Feedback Resistance Pin 1 to Pin 5 1500 Ω

LM3620-8

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

Gm

(EXT)

R

IN

R

F

= 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) 8.2 8.102/8.036 V(min)
ground)

8.298/8.364 V(max)

Pin 5 open (coke anode) 8.4 8.299/8.232 V(min)

8.501/8.568 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
External Pin Transconductance ΔI

V

Input Resistance Pin 1 to Ground. 110 kΩ

REG

for 5V ≤ V

REG

= 8.7V, V

REG

open circuited

DRIVE

= 5.0V 20 15 mA(min)

DRIVE

/ΔV

DRIVE

2mA ≤ I

EXT

EXT

0mA ≤ I

DRIVE

= 1V
/ΔV

EXT

REG

(3)

REG

≤ 2.5mA

, V

Circuit biased with V
V

open circuited 42 MΩ

DRIVE

≤ 30V 200 µV/V(max)

DRIVE

EXT

≤15mA

= 1.0V

(2)

(1)

400 750 µA(max)

10 200 nA(max)

1.5 A/V
3 2.5 mA(min)

= 1V

EXT

DRIVE

applied

0.4 A/V

Feedback Resistance Pin 1 to Pin 5 2900 Ω

www.ti.com

(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.

to conduct up to the current limit level continuously causing unnecessary power dissipation in

DRIVE

pin is forced to be above the nominal regulating voltage

REG

≤ 1V. If greater than

EXT

4 Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated

Product Folder Links: LM3620

OBSOLETE

LM3620

www.ti.com

SNVS025D –JUNE 1999–REVISED APRIL 2013

TYPICAL PERFORMANCE CHARACTERISTICS

Unless otherwise specified, TA= 25°C.

Normalized Regulation Voltage Normalized Regulation Voltage

Normalized Regulation Voltage Quiescent Current

LM3620M5-4 LM3620M5-4

Change vs I

DRIVE

Change vs V

Figure 2. Figure 3.

LM3620M5-4 LM3620M5-4

Change vs I

EXT

vs V

DRIVE

DRIVE

Figure 4. Figure 5.

LM3620M5-4 LM3620M5-4

Off State Current vs V

DRIVE

Off State Current vs Temperature

Figure 6. Figure 7.

Copyright © 1999–2013, Texas Instruments Incorporated Submit Documentation Feedback 5

Product Folder Links: LM3620

LM3620

OBSOLETE

SNVS025D –JUNE 1999–REVISED APRIL 2013

TYPICAL PERFORMANCE CHARACTERISTICS (continued)

Unless otherwise specified, TA= 25°C.

LM3620M5-4

Bode Plot (ΔV

Figure 8.

DRIVE

/ΔV

REG

www.ti.com

)

6 Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated

Product Folder Links: LM3620

OBSOLETE

LM3620

www.ti.com

SNVS025D –JUNE 1999–REVISED APRIL 2013

REVISION HISTORY

Changes from Revision C (April 2013) to Revision D Page

• Changed layout of National Data Sheet to TI format ............................................................................................................ 5

Copyright © 1999–2013, Texas Instruments Incorporated Submit Documentation Feedback 7

Product Folder Links: LM3620

IMPORTANT NOTICE

Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other
changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest
issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and
complete. All semiconductor products (also referred to herein as “components”) are sold subject to TI’s terms and conditions of sale
supplied at the time of order acknowledgment.

TI warrants performance of its components to the specifications applicable at the time of sale, in accordance with the warranty in TI’s terms
and conditions of sale of semiconductor products. Testing and other quality control techniques are used to the extent TI deems necessary
to support this warranty. Except where mandated by applicable law, testing of all parameters of each component is not necessarily
performed.

TI assumes no liability for applications assistance or the design of Buyers’ products. Buyers are responsible for their products and
applications using TI components. To minimize the risks associated with Buyers’ products and applications, Buyers should provide
adequate design and operating safeguards.

TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or
other intellectual property right relating to any combination, machine, or process in which TI components or services are used. Information
published by TI regarding third-party products or services does not constitute a license to use such products or services or a warranty or
endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual property of the
third party, or a license from TI under the patents or other intellectual property of TI.

Reproduction of significant portions of TI information in TI data books or data sheets is permissible only if reproduction is without alteration
and is accompanied by all associated warranties, conditions, limitations, and notices. TI is not responsible or liable for such altered
documentation. Information of third parties may be subject to additional restrictions.

Resale of TI components or services with statements different from or beyond the parameters stated by TI for that component or service
voids all express and any implied warranties for the associated TI component or service and is an unfair and deceptive business practice.
TI is not responsible or liable for any such statements.

Buyer acknowledges and agrees that it is solely responsible for compliance with all legal, regulatory and safety-related requirements
concerning its products, and any use of TI components in its applications, notwithstanding any applications-related information or support
that may be provided by TI. Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards which
anticipate dangerous consequences of failures, monitor failures and their consequences, lessen the likelihood of failures that might cause
harm and take appropriate remedial actions. Buyer will fully indemnify TI and its representatives against any damages arising out of the use
of any TI components in safety-critical applications.

In some cases, TI components may be promoted specifically to facilitate safety-related applications. With such components, TI’s goal is to
help enable customers to design and create their own end-product solutions that meet applicable functional safety standards and
requirements. Nonetheless, such components are subject to these terms.

No TI components are authorized for use in FDA Class III (or similar life-critical medical equipment) unless authorized officers of the parties
have executed a special agreement specifically governing such use.

Only those TI components which TI has specifically designated as military grade or “enhanced plastic” are designed and intended for use in
military/aerospace applications or environments. Buyer acknowledges and agrees that any military or aerospace use of TI components
which have not been so designated is solely at the Buyer's risk, and that Buyer is solely responsible for compliance with all legal and
regulatory requirements in connection with such use.

TI has specifically designated certain components as meeting ISO/TS16949 requirements, mainly for automotive use. In any case of use of
non-designated products, TI will not be responsible for any failure to meet ISO/TS16949.

Products Applications

Audio www.ti.com/audio Automotive and Transportation www.ti.com/automotive
Amplifiers amplifier.ti.com Communications and Telecom www.ti.com/communications
Data Converters dataconverter.ti.com Computers and Peripherals www.ti.com/computers
DLP® Products www.dlp.com Consumer Electronics www.ti.com/consumer-apps
DSP dsp.ti.com Energy and Lighting www.ti.com/energy
Clocks and Timers www.ti.com/clocks Industrial www.ti.com/industrial
Interface interface.ti.com Medical www.ti.com/medical
Logic logic.ti.com Security www.ti.com/security
Power Mgmt power.ti.com Space, Avionics and Defense www.ti.com/space-avionics-defense
Microcontrollers microcontroller.ti.com Video and Imaging www.ti.com/video
RFID www.ti-rfid.com
OMAP Applications Processors www.ti.com/omap TI E2E Community e2e.ti.com
Wireless Connectivity www.ti.com/wirelessconnectivity

Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265

Copyright © 2013, Texas Instruments Incorporated