LTC4081 datasheet(4/24 Pages) LINER

4 / 24 page

LTC4081

4081f

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Buck Converter

VFB

FB Servo Voltage

●

0.78

0.80

0.82

IFB

FB Pin Input Current

VFB = 0.85V

–50

fOSC

Switching Frequency

●

1.8

2.25

2.75

MHz

IBAT_NL_CF

No-Load Battery Current (Continuous

Frequency Mode)

No-Load for Regulator, V⎯E⎯N⎯_⎯C⎯H⎯R⎯G = 5V,

L = 10μH, C = 4.7μF

1.9

IBAT_NL_BM

No-Load Battery Current (Burst Mode

Operation)

No-Load for Regulator, V⎯E⎯N⎯_⎯C⎯H⎯R⎯G = 5V,

MODE = VBAT, L = 10μH, C = 4.7μF

μA

IBAT_SLP

Battery Current in SLEEP Mode

V⎯E⎯N⎯_⎯C⎯H⎯R⎯G = 5V, MODE = VBAT,

VOUT > Regulation Voltage

●

μA

VUVLO_BUCK

Buck Undervoltage Lockout Voltage

VBAT Rising

VBAT Falling

●

2.6

2.4

2.7

2.5

2.8

2.6

RON_P

PMOS Switch On-Resistance

0.95

RON_N

NMOS Switch On-Resistance

0.85

ILIM_P

PMOS Switch Current Limit

375

520

700

ILIM_N

NMOS Switch Current Limit

700

IZERO_CF

NMOS Zero Current in Normal Mode

IPEAK

Peak Current in Burst Mode Operation

MODE = VBAT

100

150

IZERO_BM

Zero Current in Burst Mode Operation

MODE = VBAT

tSS_BUCK

Buck Soft-Start Time

From the Rising Edge of EN_BUCK to 90%

of Buck Regulated Output

400

μs

Logic

VIH

Input High Voltage

⎯E⎯N⎯_⎯C⎯H⎯R⎯G, EN_BUCK, MODE Pin Low to High

●

1.2

VIL

Input Low Voltage

⎯E⎯N⎯_⎯C⎯H⎯R⎯G, EN_BUCK, MODE Pin High to Low

●

0.4

VOL

Output Low Voltage (⎯C⎯H⎯R⎯G)

ISINK = 5mA

●

105

IIH

Input Current High

EN_BUCK, MODE Pins at 5.5V, VBAT = 5V

●

–1

μA

IIL

Input Current Low

⎯E⎯N⎯_⎯C⎯H⎯R⎯G, EN_BUCK, MODE Pins at GND

●

–1

μA

R⎯E⎯N⎯_⎯C⎯H⎯R⎯G

⎯E⎯N⎯_⎯C⎯H⎯R⎯G Pin Input Resistance

V⎯E⎯N⎯_⎯C⎯H⎯R⎯G = 5V

1.45

3.3

MΩ

I⎯C⎯H⎯R⎯G

⎯⎯C⎯H⎯R⎯G Pin Leakage Current

VBAT = 4.5V, V⎯C⎯H⎯R⎯G = 5V

●

1μA

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 LTC4081 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

43°C/W.

The ● denotes speciﬁcations which apply over the full operating tempera-

ture range, otherwise speciﬁcations are at TA = 25°C, VCC = 5V, VBAT = 3.8V, V⎯E⎯N⎯_⎯C⎯H⎯R⎯G = 0V, VNTC = 0V, VEN_BUCK = VBAT, VMODE = 0V.

(Note 2)

ELECTRICAL CHARACTERISTICS

Note 4: Although the LTC4081 charger functions properly at 3.75V, full

charge current requires an input voltage greater than the desired ﬁnal

battery voltage per ΔVUVCL1 speciﬁcation.

Note 5: The 2.8V maximum buck undervoltage lockout (VUVLO_BUCK) exit

threshold must ﬁrst be exceeded before the minimum VBAT speciﬁcation

applies.

Note 6: IC/10 is expressed as a fraction of measured full charge current

with indicated PROG resistor.

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