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LTC4056-4.2

405642f

The LTC

4056 is a low cost, single-cell, constant-current/

constant-voltage Li-Ion battery charger controller with a

programmable termination timer. When combined with a

few external components, the LTC4056 forms a very small

standalone charger for single cell lithium-ion batteries.

Charge current and charge time are set externally with a

single resistor and capacitor, respectively. The LTC4056

charges to a final float voltage accurate to ±0.6%. Manual

shutdown is accomplished by grounding the TIMER/

SHDN pin, while removing input power automatically puts

the LTC4056 into a sleep mode. Both the shutdown and

sleep modes drain near zero current from the battery; the

shutdown mode reduces supply current to 40µA.

The output driver is both current limited and thermally

protected to prevent operating outside of safe limits. No

external blocking diode or sense resistor is required. The

LTC4056 also includes low battery charge conditioning

(trickle charging), undervoltage charge current limiting,

automatic recharge and a charge status output.

The LTC4056 is available in a low profile (1mm) 8-lead

SOT-23 (ThinSOT

) package.

■

Cellular Telephones

■

Handheld Computers

■

Digital Cameras

■

Charging Docks and Cradles

■

Low Cost and Small Size Chargers

, LTC and LT are registered trademarks of Linear Technology Corporation.

■

Standalone Li-Ion Charger with Termination

■

Programmable Termination Timer

■

No Sense Resistor or Blocking Diode Required

■

Suitable for USB-Powered Charging

■

Undervoltage Charge Current Limiting

■

Preset Charge Voltage with ±0.6% Accuracy

■

Programmable Charge Current: 200mA to 700mA

■

Automatic Recharge with Shortened Charge Cycle

■

Self-Protection for Overcurrent/Overtemperature

■

40µA Supply Current in Shutdown Mode

■

Negligible Battery Drain Current in Shutdown

■

Low Battery Charge Conditioning (Trickle Charging)

■

CHRG Status Output including AC Present

■

PCB Total Solution Area only 75mm

(700mA)

■

Low Profile (1mm) SOT-23 Package

Linear Li-Ion Charger

with Termination in ThinSOT

SENSE

CHRG

4.5V TO 6.5V

CHARGE

STATUS

DRIVE

TIMER/SHDN BAT

PROG

GND

4056-4.2 TA01

1-CELL

4.2V Li-Ion

1µF

700mA

ZXT1M322

1.3k

LTC4056

ThinSOT is a trademark of Linear Technology Corporation.

(V)

4.40

BAT

(mA)

4.70

4056 TA02

4.50 4.60

800

700

600

500

400

300

200

100

4.45 4.55 4.65 4.75

CONSTANT

CURRENT

UNDERVOLTAGE CHARGE

CURRENT LIMITING

UNDERVOLTAGE

LOCKOUT

AT 4.35V

BAT

= 4V

PROG

= 1.3k

CHG

= 700mA

INPUT Z = 100mΩ

Undervoltage Charge

Current Limiting

DESCRIPTIO

FEATURES

APPLICATIO S

TYPICAL APPLICATIO

1 2 3 4 5 6 ... 15 16

Podsumowanie treści

Strona 1 - TYPICAL APPLICATIO

LTC4056-4.21405642fThe LTC®4056 is a low cost, single-cell, constant-current/constant-voltage Li-Ion battery charger controller with aprogrammable ter

Strona 2 - ABSOLUTE AXI U RATI GS

LTC4056-4.210405642fCHRG82k800kVCC1LTC4056V+4056-4.2 F02OUTINµPROCESSORVDDFigure 2. Using a Microprocessor to Determine CHRG StateRechargeIf the batte

Strona 3

LTC4056-4.211405642fDRIVE pin could be pulled from the battery through theforward biased collector base junction.For example, to program a charge curr

Strona 4

LTC4056-4.212405642fhowever, may add enough series inductance to require abypass capacitor of at least 1µF from BAT to ground.Furthermore, a 4.7µF cap

Strona 5

LTC4056-4.213405642fTYPICAL APPLICATIO SUUSB ChargingThe applications shown in Figures 5 and 6 are USB Li-Ionchargers with automatic PowerPathTM cont

Strona 6

LTC4056-4.214405642fIt is important to keep in mind that the LTC4056 can onlycontrol charge current. If the system load is less than500mA, then the LT

Strona 7

LTC4056-4.215405642fPACKAGE DESCRIPTIOUTS8 Package8-Lead Plastic TSOT-23(Reference LTC DWG # 05-08-1637)Information furnished by Linear Technology Cor

Strona 8

LTC4056-4.216405642fLinear Technology Corporation1630 McCarthy Blvd., Milpitas, CA 95035-7417(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com

Strona 9

LTC4056-4.22405642fORDER PARTNUMBERTS8 PARTMARKINGTJMAX = 125°C, θJA = 120°C/W TO 200°C/WDEPENDING ON PC BOARD LAYOUTConsult LTC Marketing for parts s

Strona 10 - LTC4056-4.2

LTC4056-4.23405642fELECTRICAL CHARACTERISTICSThe ● denotes the specifications which apply over the full operatingtemperature range, otherwise specific

Strona 11

LTC4056-4.24405642fTYPICAL PERFOR A CE CHARACTERISTICS UWIBAT vs Temperature andSupply Voltage IBAT vs VBATTimer Error vs TemperatureTEMPERATURE (

Strona 12

LTC4056-4.25405642fBAT (Pin 6): Battery Voltage Sense Input. A precisioninternal resistor divider sets the final float voltage on thispin. This divide

Strona 13

LTC4056-4.26405642f–+–+4056-4.2 BDLTC4056-4.2110mΩVCC100Ω12µACHRGISENSERPROG1.2VUVLOCOUNTEROSCILLATORTIMER/SHDNSHDNLOGICCHRGSHDN SHDNSHDNUVIACA1VREF1.

Strona 14

LTC4056-4.27405642fAs the battery accepts charge, its voltage rises. When itreaches the preset float voltage of 4.2V, a precisely divideddown version

Strona 15

LTC4056-4.28405642fAPPLICATIO S I FOR ATIOWUUUUndervoltage LockoutAn internal undervoltage lockout (UVLO) circuit monitorsthe input voltage and keeps

Strona 16

LTC4056-4.29405642fAPPLICATIO S I FOR ATIOWUUUTermination TimerThe programmable timer is used to terminate the chargecycle. The timer duration is prog

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