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LTC4001-1

40011fa

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: Operation with current limited wall adapters is allowed down to the

undervoltage lockout threshold.

Note 3: The LTC4001E-1 is guaranteed to meet performance speciﬁca-

tions 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.

The

l denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at TA = 25°C. VIN = 5V, VEN = 0V, RPROG = 549Ω, RIDET = 549Ω, unless otherwise

speciﬁed.

SYMBOL PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

fOSC

Oscillator Frequency

1.3

1.5

1.7

MHz

Maximum Duty Factor

100

RPFET

RDS(ON) of P-Channel MOSFET

Measured from PVIN to SW

127

mΩ

RNFET

RDS(ON) of N-Channel MOSFET

Measured from SW to PGND

121

mΩ

tTIMER

Timer Accuracy

CTIMER = 0.22μF

±10

VEN

Enable Input Threshold Voltage

VEN Rising

0.6

0.8

ΔVEN

Enable Input Hysteresis

100

VPROG

PROG Pin Voltage

RPROG = 549Ω

1.213

VIDET

IDET Pin Voltage

RIDET = 549Ω

1.213

IIDET

IDET Threshold

RIDET = 549Ω

150

200

250

ICHRG

CHRG Pin Weak Pull-Down

Current

VCHRG = 1V

μA

VCHRG

CHRG Pin Output Low Voltage

ICHRG = 5mA

0.2

0.4

VOL

FAULT Pin Output Low Voltage

1mA Load

0.4

VOH

FAULT Pin Output High Voltage

1mA Load

4.6

VRECHRG Recharge Battery Threshold

Voltage

VFLOAT – VRECHRG VBAT Falling

100

135

tRB

Recharge Filter Time Constant

tRECHRG

Recharge Time

Percent of Total Charge Time

tTRIKL

Low-Battery Trickle Charge Time

Percent of Total Charge Time, VBAT < 2.8V,

Measured Using BATSENS and GNDSENS Pins

ISS

Soft-Start Ramp Current

VBAT < VFLOAT – 100mV, VBAT Across BATSENS

and GNDSENS Pins

12.8

μA

VCOLD

NTC Pin Cold Temperature Fault

Threshold

From NTC to GNDSENS Pin

Rising Threshold

Falling Threshold

0.74 VINSENSE

0.72 VINSENSE

VHOT

NTC Pin Hot Temperature Fault

Threshold

From NTC to GNDSENS Pin

Falling Threshold

Rising Threshold

0.29 VINSENSE

0.30 VINSENSE

VDIS

NTC Disable Threshold (Falling)

From NTC to GNDSENS Pin

0.015 •

VINSENSE

0.02 •

VINSENSE

0.025 •

VINSENSE

ΔVDIS

NTC Disable Hysteresis

From NTC to GNDSENS Pin

0.01 •

VINSENSE

Note 4: TJ is calculated from the ambient temperature TA and power dis-

sipation PD according to the following formula:

TJ = TA + (PD • 37°C/W)

Note 5: This IC includes overtemperature protection that is intended to

protect the device during momentary overload. Junction temperature will

exceed 125°C when overtemperature protection is active. Continuous

operation above the speciﬁed maximum operating junction temperature

my impair device reliability.

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