LTC4056-4.2 datasheet(3/16 Pages) LINER

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LTC4056-4.2

405642f

ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VCC = 5V.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

∆VRECHRG

Recharge Threshold Voltage

VFLOAT – VRECHRG, VBAT > VTRIKL,

100

150

200

Charge Termination Timer Expired

TTIMER

TIMER/SHDN Accuracy

CTIMER = 1µF RPROG = 1.43k

Charger Manual Control

VMSDT

Manual Shutdown Threshold Voltage

VTIMER/SHDN Increasing

0.6

0.82

VMSHYS

Manual Shutdown Hysteresis Voltage

VTIMER/SHDN Decreasing

125

ISHDN

TIMER/SHDN Pin Pull-up Current

VTIMER/SHDN = 0V

– 10

– 7

– 4

µA

Protection

IDSHRT

Drive Output Short-Circuit Current Limit

VDRIVE = VCC

130

IPSHRT

PROG Pin Short-Circuit Current Limit

VPROG = 0V

1.4

Status Output

ICHRG

CHRG Pin Weak Pull-Down Current

VCHRG = 1V, VTIMER/SHDN = 0V

µA

VCHRG

CHRG Output Low Voltage

ICHRG = 10mA

0.2

0.4

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: The LTC4056E is guaranteed to meet performance specifications

from 0

°C to 70°C ambient temperature range. Specifications over the

–40

°C to 85°C operating ambient temperature range are assured by

design, characterization and correlation with statistical process controls.

Note 3: Although the LTC4056 will operate with input voltages as low as

4.5V, charging will not begin until VCC exceeds VUVCL.

Note 4: Assumes that the external PNP pass transistor has negligible B-C

reverse-leakage current when the collector is biased at 4.2V (VBAT) and the

base is biased at 5V (VCC).

Note 5: Assumes that the external PNP pass transistor has negligible B-E

reverse-leakage current when the emitter is biased at 0V (VCC) and the

base is biased at 4.2V (VBAT).

TYPICAL PERFOR A CE CHARACTERISTICS

Float Voltage vs Temperature and

Supply Voltage

TEMPERATURE (

°C)

–50

4.205

4.210

4.215

4056-4.2 G01

4.200

4.195

–25

100

125

4.190

4.185

IBAT = 10mA

PNP = FZT749

VCC = 6.5V

VCC = 4.75V

IBAT (mA)

300

4056-4.2 G02

4.200

4.199

100

200

400

4.198

4.202

4.201

500

600

700

VCC = 5V

TA = 25°C

PNP = FZT749

RPROG = 1.30k

TEMPERATURE (

°C)

–50

215

4056-4.2 G03

200

190

–25

185

180

220

210

205

195

100

125

RPROG = 4.53k

PNP = FZT749

VCC = 6.5V

VCC = 4.75V

Float Voltage vs IBAT

IBAT vs Temperature and

Supply Voltage

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