LTC4069 datasheet(3/18 Pages) LINER

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LTC4069

4069fc

For more information www.linear.com/LTC4069

The l denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.

VCC = 5V, VBAT = 3.8V, VNTC = 0V unless otherwise specified. (Note 2)

elecTrical characTerisTics

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: The LTC4069 is guaranteed to meet performance specifications

from 0°C to 85°C. Specifications over the –40°C to 85°C operating

temperature range are assured by design, characterization and correlation

with statistical process controls.

Note 3: Failure to solder the exposed backside of the package to the PC

board ground plane will result in a thermal resistance much higher than

rated.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

IPROG

PROG Pin Pull-Up Current

VPROG > 1V

µA

VMS, PROG

PROG Shutdown Threshold Voltage

VPROG Rising

3.7

4.3

tSS

Soft-Start Time

170

µs

ITRKL

Trickle Charge Current

VBAT = 2V, RPROG = 2k (0.1%)

VTRKL

Trickle Charge Threshold Voltage

VBAT Rising

2.7

2.9

3.05

VTRHYS

Trickle Charge Hysteresis Voltage

∆VRECHRG

Recharge Battery Threshold Voltage

VFLOAT – VRECHRG, 0°C < TA < 85°C

100

130

∆VUVCL1

∆VUVCL2

(VCC – VBAT) Undervoltage Current

Limit

IBAT = 90% Programmed Charge Current

IBAT = 10% Programmed Charge Current

180

220

125

330

150

tTIMER

Termination Timer

4.5

Hrs

Recharge Timer

1.5

2.25

Hrs

Low-Battery Trickle Charge Time

VBAT = 2.5V

0.75

1.125

1.5

Hrs

VCHRG

CHRG Pin Output Low Voltage

ICHRG = 5mA

105

ICHRG

CHRG Pin Leakage Current

VBAT = 4.5V, VCHRG = 5V

µA

IC/10

End of Charge Indication Current Level

RPROG = 2k (Note 5)

0.08

0.095

0.11

mA/mA

TLIM

Junction Temperature in Constant

Temperature Mode

115

°C

RON

Power FET “On” Resistance

(Between VCC and BAT)

IBAT = 350mA

450

mΩ

fBADBAT

Defective Battery Detection CHRG

Pulse Frequency

DBADBAT

Defective Battery Detection CHRG

Pulse Frequency Duty Ratio

INTC

NTC Pin Current

VNTC = 2.5V

µA

VCOLD

Cold Temperature Fault Threshold

Voltage

Rising Voltage Threshold

Hysteresis

0.76 • VCC

0.015 • VCC

VHOT

Hot Temperature Fault Threshold

Voltage

Falling Voltage Threshold

Hysteresis

0.35 • VCC

0.017 • VCC

VNTC-DIS

NTC Disable Threshold Voltage

Falling Threshold; VCC = 5V

VDIS-HYS

NTC Disable Hysteresis Voltage

fNTC

Fault Temperature CHRG Pulse Frequency

DNTC

Fault Temperature CHRG Pulse Frequency

Duty Ratio

Note 4: Although the LTC4069 functions properly at 3.75V, full charge

current requires an input voltage greater than the desired final battery

voltage per the ∆VUVCL1 specification.

Note 5: IC/10 is expressed as a fraction of measured full charge current

with indicated PROG resistor.

Note 6: This IC includes overtemperature protection that is intended

to protect the device during momentary overload conditions. Junction

temperature will exceed 125°C when overtemperature protection is active.

Continuous operation above the specified maximum operating junction

temperature may impair device reliability.

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