Unless otherwise noted, V

Limits appearing in boldface type apply over the entire junction temperature range for operation, −40 to +125˚C. (Notes 2, 9,

8, 12)

Symbol

Parameter

Condition

Min

Typ

Max

Units

I

CHG

Fast Charge Current Accuracy

I

−10

+10

%

Fast Charge Current Range

478

937

mA

Programmable Charging

Current Step

43

mA

I

PRE−CHG

Pre-Charge Current

V

28

42

59

mA

R

SENSE

Internal Current Sense

Resistance

120

m

Ω

Internal Current Sense Resistor

Load Current

1.2

A

CHARGING PERFORMANCE

V

BATT

Battery Regulation Voltage

(CV Mode, for 4.1V Cell)

T

4.015

4.1

4.19

Battery Regulation Voltage

CV mode, for 4.2V Cell)

T

4.115

4.2

4.289

V

CHG-Q

Full Charge Qualification

Threshold

V

Pre-Charge to Full Current

2.8

3.0

3.2

V

V

BAT-RST

Restart Threshold Voltage

(For 4.1V Cell)

V

to Pre-Qual State

3.9

V

Restart Threshold Voltage

(For 4.2 Cell)

V

to Pre-Qual State

4.0

t

EOC

Time to EOC State

−40˚C to +85˚C (Note 10)

4.80

5.625

6.55

Hrs

A/D CONVERTER PERFORMANCE

Resolution

8

Bits

INL

Relative Accuracy

−1

+1

LSB

DNL

Differential Nonlinearity

No Missing Code

−1

+1

LSB

Note: While charging a Li-Ion battery with this charger is possible in cold temperatures (generally below −5˚C–0˚C) is possible with the LP3941A, charging a battery

outside its manufacturer recommended temperature limits is strongly discouraged.

I

Unless otherwise noted, V

appearing in boldface type apply over the entire junction temperature range for operation, −40 to +125˚C. (Notes 2, 8, 9)

Symbol

Parameter

Condition

Min

Typ

Max

Units

F

CLK

Clock Frequency

400

kHz

t

BF

Bus-Free Time between START and

STOP

(Note 10)

1.3

µs

t

HOLD

Hold Time Repeated START Condition

(Note 10)

0.6

µs

t

CLK-LP

CLK Low Period

(Note 10)

1.3

µs

t

CLK-HP

CLK High Period

(Note 10)

0.6

µs

t

SU

Set-Up Time Repeated START Condition

(Note 10)

0.6

µs

t

DATA-HOLD

Data Hold Time

(Note 10)

0

µs

t

DATA-SU

Data Set-Up Time

(Note 10)

100

ns

t

SU

Set-Up Time for STOP Condition

(Note 10)

0.6

µs

t

TRANS

Maximum Pulse Width of Spikes that must

be suppressed by the input filter of both

DATA & CLK signals.

(Note 10)

50

ns

Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device

is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the Electrical

Characteristics tables.

Note 2: All voltages are with respect to the potential at the GND pin.

Note 3: The amount of Absolute Maximum power dissipation allowed for the device depends on the ambient temperature and can be calculated using the formula

www.national.com

14