Linear Technology Battery Management Solutions User Manual

VOL 5

Battery Management Solutions

High Performance Analog ICs

B AT TE RY M AN A G E ME N T SO L UT I O N S

Linear Technology’s high performance battery management ICs

enable long battery life and run time, while providing precision charging control, constant

status monitoring and stringent battery protection. Our proprietary design techniques seamlessly

manage multiple input sources while providing small solution footprints, faster charging and

100% standalone operation. Battery and circuit protection features enable improved thermal

performance and high reliability operation.

Each battery chemistry has unique charging requirements. Selecting the correct battery charger

increases the operational run time of the end product, ensuring that the battery is always

optimally charged. This guide contains the essential technical criteria to easily identify the

optimum battery charging IC for 1-cell to multiple-cell configurations, regardless of chemistry.

Data sheets for our complete battery management product portfolio, including our latest

product releases, are available for download at

www.linear.com.

Contents/Block Diagrams

TYPE PA GE TOPOLOGY BAT T E R Y CHEMISTRY

Linear

USB Compatible Battery Chargers

...............................................5-8

“X” Series–Fast Charge Depleted Batteries (No Trickle Charge)

4.2V Float Voltage (1- and 2-Cell) Battery Chargers

4.1V Float Voltage Battery Chargers

Coin Cell/Low Current Battery Chargers

Nickel Battery Chargers

................................................................ 9

............................................. 7

....................................... 8

...................... 5, 6

Linear Charger + Regulators

Battery Chargers with Onboard Regulators or Comparators

......... 6, 13

..... 5, 6, 8

LINEAR

CHARGER

LINEAR

CHARGER

AND

REGULATOR

BAT

OUT1

OUT2

Lithium-Ion/Polymer

NiMH/NiCd

Lithium-Ion/Polymer

Power Managers (BAT Decoupled from V

4.1V Float Voltage Power Managers

Linear Power Managers

................................................................ 10

Switch Mode Power Managers

Controller Power Managers

..........................................................19

............................................. 7, 10

..................................................... 10

OUT

)

WALL

USB

POWER MANAGER

SYSTEM LOAD

BAT

Lithium-Ion/Polymer

LiFePO

Visit www.linear.com for our complete product offering.

B AT TE RY M AN A G E ME N T SO L UT I O N S

TYPE PA GE TOPOLOGY BAT T E R Y CHEMISTRY

Power Management Integrated Circuits (PMICs)

4.1V Float Voltage PMICs

.......................................................... 7

Switch Mode Power Manager-Based PMICs

Linear Power Manager-Based PMICs

Battery-Fed PMICs

.................................................................... 13

........................................ 12

............................. 11

USB/WALL

4.35V TO 5.5V

ENABLE

CONTROLS

TO OTHER LOADS

BAT

3.3V/25mA

RTC/LOW

PMIC

0.8V TO 3.6V/400mA

0.8V TO 3.6V/1A

RST

POWER LOGIC

MEMORY

I/O

CORE

µPROCESSOR

Lithium-Ion/Polymer

Switch Mode – Monolithic

Switch Mode Buck Battery Chargers

......................................... 9, 14

Switch Mode Buck-Boost Battery Chargers

.............................. 15

SWITCHING

MONOLITHIC

CHARGER

Lithium-Ion/Polymer

LiFePO

BAT

NiMH/NiCd

Lead-Acid

Multichemistry

Switch Mode

Switch Mode Buck Battery Charger Controllers

Switch Mode Buck-Boost Battery Charger Controllers

Switch Mode

Smart Battery Chargers

– Controller

......................... 14

.............. 15

– Smart Battery

............................................................. 16

Related Battery Management Products

Battery Backup System Managers .....................................15-16

Special Battery Management Function ICs........................17-24

Ideal Diodes/PowerPath™ Controllers

Supercapacitor Chargers

...................................................18

High Side and Low Side Current Sensing

Battery Stack Monitors for Hybrid/Electric

Vehicles and Battery Backup Systems...............................22-23

Battery Monitoring – Comparators & Voltage References ..24

Master Selector Guides

......................................................25-29

..............................17

..........................21

SWITCHING

MONOLITHIC

CHARGER

BAT

Lithium-Ion/Polymer

LiFePO

NiMH/NiCd

Lead-Acid

Multichemistry

BAT

SMART

BATTERY

CHARGER

• SPI

• SMBus

• I/O

Lithium-Ion/Polymer

LiFePO

NiMH/NiCd

Lead-Acid

Multichemistry

Lithium-Ion/Polymer

LiFePO

NiMH/NiCd

Lead-Acid

Multichemistry

Supercapacitor

T O P O L O GY OV E R V IE W — P OW E R PAT H C O NT R O L A N D B ATT ERY- F E D SY S TE M S

Battery-Fed (Charger-Fed) Systems

First generation USB system applications incorporated a currentlimited battery charger directly between the USB port and the battery (see Figure 1). In this battery-fed topology, the battery directly powers the system and the power available to the system from the USB can be expressed as:

= I

SYS

because V linear chargers, input current approximately equals charge current, so a simple current limit is sufficient. Connecting the system load directly to the battery eliminates the need for a load sharing diode. Disadvantages of this topology include low efficiency, 500mA maximum charge current from the USB, no system power when the battery voltage is low (i.e., a dead or missing battery), and loss of nearly half of the available power within the linear battery charger element as heat. Furthermore, an additional resistor and signal transistor is required to increase charge current when a wall adapter is present.

•

USB

BAT

is the only voltage available to the system load. For

BAT

AC ADAPTER

USB

Figure 1: Simplified Battery-Fed Control Circuit

LINEAR

CC/CV

CHARGER

BAT

SYSTEM

LOAD

Linear PowerPath Power Managers

Second generation USB charging systems, commonly referred to as PowerPath systems, develop an intermediate voltage between the USB port and the battery (see Figure 2). In PowerPath systems, the USB port supplies current to an intermediate voltage, V current-limited switch. V

powers both the linear battery charger

OUT

and the system load with priority going to the system load. By decoupling the battery from the system load, charging can be carried out opportunistically. PowerPath systems also offer instant-on operation because the intermediate voltage is available for system loads as soon as power is applied to the circuit—this allows the end product to operate immediately when plugged in, regardless of the battery’s state of charge. In a linear PowerPath system, nearly all of

AC ADAPTER

USB

BUS

LINEAR USB

CURRENT LIMIT

LINEAR

CC/CV

CHARGER

OUT

, via a

IDEAL DIODE

the 2.5W available from the USB port is accessible to the system load provided the system load does not exceed the input current limit. Furthermore, if the system requires more power than is available from the input, an ideal diode also supplies current to the load from the battery. Thus, a linear PowerPath system offers significant advantages over a battery-fed system. But significant power may still be lost, especially if the system load exceeds the input current limit and the battery voltage is low, resulting in a large differential between the input voltage and both the system voltage and the battery voltage. An optional external PFET can reduce the ideal diode voltage drop during heavy load conditions.

OUT

SYSTEM

LOAD

GATE

BAT

OPTIONAL: AUGMENTS INTERNAL IDEAL DIODE

Figure 2: Simplified Linear Power Manager Circuit

BAT

Switch Mode PowerPath Power Managers

T O P O L O GY OV E R V IE W — P OW E R PAT H C O NT R O L A N D B ATT ERY- F E D SY S TE M S

Third generation USB charging systems feature a switch mode-based topology (see Figure 3). This type of PowerPath device produces an intermediate bus voltage from a USB-compliant step-down switching regulator that regulates a small differential voltage above the battery voltage. Linear Technology refers to this as Bat-Track™ adaptive output control because the output voltage tracks the battery voltage. The differential voltage between the battery and the system is large enough to allow full charging through the linear charger, but small enough to minimize power lost in the charger, thereby increasing system efficiency and maximizing power available to the load. The switching average input current limit allows the use of nearly all of the 2.5W available from the USB port, independent of operating

AC ADAPTER

USB

BUS

SWITCHING USB CURRENT LIMIT

LINEAR

CC/CV

CHARGER

conditions. By ensuring that the Bat-Track regulation loop does not allow the output voltage to drop below 3.5V (even with severely discharged batteries) this topology also provides instant-on functionality. As in linear PowerPath systems, an ideal diode allows the battery to supplement input power during heavy load transients. An optional external PFET can reduce the ideal diode voltage drop. This architecture is suitable for systems with large (>1.5AHr) batteries and high (>2W) system power.

OUT

SYSTEM

LOAD

IDEAL DIODE

GATE

BAT

OPTIONAL: AUGMENTS INTERNAL IDEAL DIODE

BAT

Figure 3: Simplified Switch Mode Power Manager Circuit

T O P O L O GY OV E R V IE W — P OW E R PAT H C O NT R O L A N D B ATT ERY- F E D SY S TE M S

External High Voltage Switching Regulator Control

Several Linear Technology power manager ICs (both linear and switching) provide the ability to adaptively control the output of an external high voltage switching regulator (see Figure 4). The WALL pin detects the presence of a high voltage supply (e.g., car battery, 12V wall adapter, FireWire input) and enables Bat-Track adaptive output control via the buck regulator’s V

pin. Similar to a switching

PowerPath system, the output of the high voltage buck is regulated to a small differential voltage above the battery voltage with a minimum output voltage of approximately 3.5V. This functionality maximizes charger efficiency while still allowing instant-on operation even when the battery is deeply discharged. Compared to the

HV INPUT

USB

HIGH VOLTAGE

BUCK REGULATOR

CHARGER/POWER

BUS

MANAGER

ACPRWALLV

OUT

SYSTEM

LOAD

GATE

OPTIONAL: AUGMENTS INTERNAL IDEAL DIODE

BAT

traditional approach of converting a high voltage input to 5V to power the system, this technique can reduce system power

dissipation by over 50%. By choosing an LT

3653 as the high voltage regulator, further system improvements can be made (see Figure 5). The LT3653 accurately controls its maximum output current, which eliminates the potential for localized heating, reduces the required current rating of the power components and provides a robust solution to withstand harsh overload and short circuit conditions. In addition, the unique LT3653 architecture eliminates a power PFET and output capacitor from the application schematic.

LT3653

HIGH VOLTAGE

HV INPUT

USB

BUCK REGULATOR

BUS

SENSE

HVOK

WALLV

CHARGER/POWER

MANAGER

OUT

ACPR

OUT

SYSTEM

LOAD

GATE

OPTIONAL:

AUGMENTS

INTERNAL

IDEAL DIODE

BAT

Figure 4: Simplified HV Switching Regulator Control Circuit

Figure 5: Simplified LT3653 Control Circuit

Attribute Battery-Fed Linear PowerPath Switch Mode PowerPath

Table 1: Comparison of USB-Compliant Battery Charging System Topologies

Size Small Moderate Larger

Complexity Simple Moderate More Complex

Solution Cost Low Moderate Higher

USB Charge Current Limited to 500mA Limited to 500mA 500mA and Higher (~2.3W)

Autonomous Control of Input Power

No Yes Yes

Sources

Instant-On Operation No Yes Yes

System Load Efficiency

<USB Limit)

BUS

System Load Efficiency (I

>USB Limit) Good (V

SYS

Good (V

Battery Charger Efficiency Good (V

) Exceptional (>90%) Excellent (~90%)

BAT/VBUS

) Good (V

BAT/VBUS

) Good (V

BAT/VBUS

) Excellent (~90%)

BAT/VBUS

) Excellent (~90%)

BAT/VBUS

Power Dissipation High Moderate Low

Bat-Track Adaptive Output Control/

No Yes Yes

Interface to HV Buck

L i t h iu m- Io n/ Po ly me r

Linear Li-Ion/Polymer Battery Chargers

We produce a comprehensive line of high performance battery chargers for any rechargeable battery chemistry, including lithium-ion, lithium-polymer, lead acid, and nickel-based. Our linear battery charger ICs are completely autonomous in operation and offer many standard features for battery safety and management, including on-chip battery preconditioning, status signaling, thermal regulation and NTC thermistor interface.

L i - I O N /P O LY M ER BAT TE R Y CH A R G ER S

LTC®4095: USB Li-Ion/Polymer Battery Charger in 2mm x 2mm DFN

INPUT

4.3V TO 5.5V UP TO 7V

TRANSIENTS

500mA Single Cell Li-Ion Charger

LTC4095

SUSP

GND

CHRGHPWR

PROG

BAT

NTC

PROG

1.74k

Li-Ion

LTC4078/X: Dual Input Li-Ion/Polymer Battery Charger with Overvoltage Protection

2k 1%

800mA (WALL)

500mA (USB)

3.9k

Li-Ion

WALL

ADAPTER

USB

PORT

2k 1%

1.24k 1%

LTC4078/X

DCIN

USBIN

IUSB

IDC

BAT

BATDET

ITERM

GND

LTC4095:

Actual Size Demo Circuit

High Voltage Dual Input Battery Charger for Li-Ion Battery Pack

L i - I O N /P O LY M ER BAT TE R Y CH A R G ER S

L i t h iu m- Io n/ Po ly me r

Part Number

Number of Battery Cells (Series)

Maximum Charge Current (A)

Input Voltage (V) Cell Type

Integrated Power Transistor

Charge Termination (Plus Indication)

Package (mm x mm)

Linear Li-Ion/Polymer Battery Chargers

LTC4054L 1 0.15 4.25 to 6.5 Li-Ion/Poly

C/10 ThinSOT

™

LTC1734L 1 0.18 4.55 to 8 Li-Ion/Poly External External μC ThinSOT

LTC4065L/X 1 0.25 3.75 to 5.5 Li-Ion/Poly

LTC4080*/X*

1 0.5 3.75 to 5.5 Li-Ion/Poly

LTC4081* 1 0.5 3.75 to 5.5 Li-Ion/Poly

Timer + C/10 2x2 DFN-6

Timer + C/10 3x3 DFN-10, MSOP-10E

Timer + C/10 3x3 DFN-10

LTC4056* 1 0.7 4.5 to 6.5 Li-Ion/Poly External Timer ThinSOT

LTC1734 1 0.7 4.55 to 8 Li-Ion/Poly External External μC ThinSOT

LTC4065* 1 0.75 3.75 to 5.5 Li-Ion/Poly

LTC4065-4.4* 1 0.75 3.75 to 5.5 Li-Ion/Poly

LTC4065A* 1 0.75 3.75 to 5.5 Li-Ion/Poly

LTC4069* 1 0.75 3.75 to 5.5 Li-Ion/Poly

LTC4069-4.4* 1 0.75 3.75 to 5.5 Li-Ion/Poly

LTC4054*/X*

1 0.8 4.25 to 6.5 Li-Ion/Poly

LTC4057* 1 0.8 4.25 to 6.5 Li-Ion/Poly

LTC4059* 1 0.9 3.75 to 8 Li-Ion/Poly, Ni

LTC4059A* 1 0.9 3.75 to 8 Li-Ion/Poly, Ni

LTC4058*/X*

LTC4068*/X*

LTC4075*/X*

LTC4075HVX*

LTC4078*/X*

1 0.95 4.25 to 6.5 Li-Ion/Poly

1 0.95 4.3 to 8 Li-Ion/Poly

1 0.95 4.3 to 6, 22 max Li-Ion/Poly

LTC4076* 1 0.95 4.3 to 8 Li-Ion/Poly

LTC4077* 1 0.95 4.3 to 8 Li-Ion/Poly

LTC3550-1* 1 0.95 4.3 to 8 Li-Ion/Poly

LTC3550* 1 0.95 4.3 to 8 Li-Ion/Poly

LTC3552-1* 1 0.95 4.25 to 8 Li-Ion/Poly

LTC3552* 1 0.95 4.25 to 8 Li-Ion/Poly

LTC4095* 1 0.95 4.3 to 5.5 Li-Ion/Poly

LTC4064* 1 1.0 4.25 to 6.5 Li-Ion/Poly

LTC4061* 1 1.0 4.5 to 8 Li-Ion/Poly

LTC4061-4.4* 1 1.0 4.5 to 8 Li-Ion/Poly

LTC4062*

LTC4063*

†

LTC4096*/X*

1 1.0 4.3 to 8 Li-Ion/Poly

1 1.2 4.25 to 5.5 Li-Ion/Poly

LTC4097* 1 1.2 4.25 to 5.5 Li-Ion/Poly

LTC4053* 1 1.25 4.25 to 6.5 Li-Ion/Poly

LTC4052

1 1.3 4.5 to 10 Li-Ion/Poly

LTC1733 1 1.5 4.5 to 6.5 Li-Ion/Poly

‡

Timer + C/10 2x2 DFN-6

C/10 ThinSOT

External μC ThinSOT

External μC 2x2 DFN-6

C/10 3x3 DFN-8

C/x 3x3 DFN-8

C/x 3x3 DFN-10

C/10 3x3 DFN-10

C/x 3x5 DFN-16

Timer + C/10 2x2 DFN-8

Timer + C/10 MSOP-10E

Timer + C/x

3x3 DFN-10

Timer + C/x 3x3 DFN-10

C/x 3x3 DFN-10

C/x 2x3 DFN-12

Timer + C/10 3x3 DFN-10, MSOP-10E

Timer + C/10 MSOP-8E

Timer + C/10 MSOP-10E

LTC1731 1, 2 1.5 4.5 to 12 Li-Ion/Poly External Timer + C/10 MSOP-8, S0-8

‡

LTC1732 1, 2 1.5 4.5 to 12 Li-Ion/Poly, Ni

* USB 2.0 Compatible,

Pulse Charger

†

Onboard Comparator, ‡ Constant-Current Mode (Voltage Mode Disabled), § Onboard LDO, ¶ “X” (No Trickle Charge) Versions Useful when the System Load Exceeds the Trickle Charge Current at Very Low Battery Voltages

External Timer + C/10 MSOP-10

L i t h iu m- Io n/ Po ly me r

4 . 1 V BAT TE R Y FL O AT V O LTAG E

4.1V/Cell Battery Float Voltage

Our 4.1V per cell float voltage chargers improve battery life and high temperature safety margin by accurately charging the battery to a level slightly below full charge.

Part Number

Number of Battery Cells (Series)

Maximum Charge Current (A)

Input Voltage (V)

Battery Charger Type

USB 2.0 Compatible

Interface to High Voltage Buck

PowerPath Control

Integrated DC/DC Converters

Package (mm x mm)

Linear and Switch Mode Battery Chargers, Power Managers, Smart Battery Chargers and PMICs —4.1V/Cell Float Voltage

LTC4070 1 0.05

Unlimited Shunt – – – – 2x3 DFN-8, MSOP-8E

LTC4071 1 0.05 Unlimited Shunt – – – – 2x3 DFN-8, MSOP-8E

LTC3455-1 1 0.5 2.7 to 5.5 Linear

LTC1734-4.1 1 0.7 4.55 to 8 Linear

LTC3559-1 1 0.95 4.3 to 5.5 Linear

LTC4055-1 1 1 4.3 to 5.5 Linear

LTC4064 (4.0V) 1 1 4.25 to 6.5 Linear

LTC4089-1 1 1.2 6 to 36 Linear

‡

LTC1733

1 1.5 4.5 to 6.5 Linear

LTC4066-1 1 1.5 4.3 to 5.5 Linear

LTC4085-1 1 1.5 4.35 to 5.5 Linear

LTC3557-1 1 1.5 4.35 to 5.5 Linear

LTC3577-1/-4 1 1.5 4.35 to 5.5 Linear

~ ~ ~

–

2 Bucks 4x4 QFN-24

– – – ThinSOT

– – 2 Bucks 3x3 QFN-16

–

– 4x4 QFN-16

– – – MSOP-10E

–

– 3x6 DFN-22

– – – MSOP-10E

–

– 3x4 DFN-14

4x4 QFN-24, 4x4 QFN-24

3 Bucks, 1 LDO 4x4 QFN-28

3 Bucks, 2 LDOs,

4x7 QFN-44

10-LED Boost

LTC3576-1 1 1.5 4.35 to 5.5 Bat-Track Linear

LTC3555-3 1 1.5 4.35 to 5.5 Bat-Track Linear

LTC3586-1 1 1.5 4.35 to 5.5 Bat-Track Linear

~ ~ ~

–

3 Bucks, 1 LDO 4x6 QFN-38

3 Bucks, 1 LDO 4x5 QFN-28

1 Boost,

4x6 QFN-38 1 Buck-Boost, 2 Bucks, 1 LDO

LTC4098-1 1 1.5 4.35 to 5.5 Bat-Track Linear

LTC4099* 1 1.5 4.35 to 5.5 Bat-Track Linear

LTC4160-1 1 1.5 4.35 to 5.5 Bat-Track Linear

~ ~ ~

–

– 3x4 QFN-20

LTC1731-4.1 1 2 4.5 to 12 Linear – – – – MSOP-8/SO-8

LTC1731-8.2 2 2 4.5 to 12 Linear – – – – MSOP-8/SO-8

LTC1732-4

1, 2 2 4.5 to 12 Linear – – – – MSOP-10

LTC4050-4.1/8.2 1 2 4.5 to 12 Linear – – – – MSOP-10

LTC4001-1 1 2 4 to 5.5 Switch Mode – – – – 4x4 QFN-16

LT3650-4.1

LTC1980

LTC4110

/8.2#1, 2 2 4.75 to 32 Switch Mode – – – – 3x3 DFN-12, MSOP-12E

†

1, 2 2 4.1 to 12 Switch Mode – – – – SSOP-24

1–4 3 6 to 20 Switch Mode/

– –

– 5x7 QFN-38

Flyback

LTC4155 1 3.5 4.35 to 5.5 Switch Mode

–

– 4x5 QFN-28

LT3651-4.1 1 4 4.8 to 32 Switch Mode – – – – 5x6 QFN-36

LT3651-8.2 2 4 9 to 32 Switch Mode – – – – 5x6 QFN-36

LT3652/HV 1–3/1–4 2 4.95 to 32

LTC4007/-1 3, 4 4 6 to 28 Switch Mode – –

†

LTC4100

LTC4101

LTC4008

LTC4009

LTC4012

LTC1760

LTC1960

* I

†

/-1 1–4 4 6 to 28 Switch Mode – – – – 4x4 QFN-20

†

/-1/-3 1–4 4 6 to 28 Switch Mode – –

†

C Controlled, † Programmable, ‡ SEL Pin = OV Programs for 4.1V or 4.2V, § 7.5V Start-up Voltage for 1-Cell Operation, # 11.5V Start-up Voltage, ¶ 500mA with External PFET

2–6 4 6 to 28 Switch Mode – –

1 4 6 to 28 Switch Mode – –

2–6 4 6 to 28 Switch Mode – –

2–6 8 6 to 28 Switch Mode – –

Switch Mode – – – – 3x4 DFN-12, MSOP-12E

– SSOP-24

– SSOP-20

– 4x4 QFN-20

– TSSOP-48

– 5x7 QFN-38, SSOP-36

L O W CU R R E NT / C O IN CE L L BAT TE RY C H A RG E R S

Low Current/Coin Cell Battery Chargers

L i t h iu m- Io n/ Po ly me r

Our coin cell battery chargers enable highly accurate charging of low capacity, charge-sensitive coin cells used in thin, compact devices such as Bluetooth headsets and hearing aids.

LTC4054L: 150mA Standalone Li-Ion Battery Charger for Coin Cells

4.5V TO 6.5V

1µF

90mA Li-Ion Coin Cell Charger

100

CONSTANT

CURRENT

CHA RGE C URREN T (mA)

LTC4054L Complete Charge Cycle

= 5V

= 130°C/W

= 1.69k

PROG

= 25°C

0.25 0.75

0.5 TIM E (HO URS)

LT4351

GND

PROG

CONSTANT

VOLTAGE

1.75

1.5

BAT

LTC4054L-4.2

1.25 2.25

1.0

2.0

1.69k

4.4

4.3

4.2

4.1

4.0

3.9

3.8

3.7

3.6

3.5

3.4

90mA

Li-Ion COIN CELL

BAT T E RY VO LTA GE ( V )

LTC4054L:

Actual Size Demo Circuit

LTC4065L: 250mA Standalone Linear Li-Ion Battery Charger in 2mm x 2mm DFN

4.3V TO 5.5V

Standalone Li-Ion Charger

110

100

CONSTANT CURRENT

CHARGE CURRENT (mA)

PROG

0.5

LTC4065L Complete Charge Cycle

= 5V

= 2k

R1 510

1.5 TIME (HOURS)

TERMINATION

2.5

LTC4065L

CHRG

CONSTANT VOLTAGE

CHRG TRANSITION

CHARGE

3 3.5 4

BAT

PROG

GND

4.5

4.3

4.1

3.9

3.7

3.5

3.3

100mA

BAT T E RY VO LTA GE ( V )

4.2V

Li-Ion BATTERY

R3 2k

Part Number

Charge Current Range (mA) Input Voltage (V)

Battery Charger Type Standalone

Charge Termination (Plus Indication)

Thermal Regulation

Integrated Power Transistor

Package (mmx mm)

Coin Cell Li-Ion Battery Chargers

LTC4070 0.001-50

†

Unlimited Shunt

~ ~

–

2x3 DFN-8 MSOP-8E

LTC4071 0.001-50 Unlimited Shunt

~ ~

–

2x3 DFN-8 MSOP-8E

LTC4054L 10-150 4.25 to 6.5 Linear

C/10

~ ~

ThinSOT

LTC1734L 10-180 4.55 to 8 Linear – – – External ThinSOT

LTC4065L/LX

LTC4059/A 90-900 3.75 to 8 Linear – –

“X” (No Trickle Charge) Versions Useful when the System Load Exceeds the Trickle Charge Current at Very Low Battery Voltages, † 500mA with ext PFET

15-250 3.75 to 5.5 Linear

Timer + C/10

~ ~

2x2 DFN-6

+ 22 hidden pages

Linear Technology Battery Management Solutions User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual