1C

4.1V

3.9V

3V

Prequalification to Fast

Charge transition

Battery

Voltage

Battery

Current

CC to CV transition

4.1V 0r 4.2V

Time

ON

OFF

ON

OFF

50 mA

GLED

RLED

End of Charge

Current

0.1C (Default)

LP3947

SNVS298B – NOVEMBER 2004 – REVISED APRIL 2013

www.ti.com

ELECTRICAL CHARACTERISTICS, I

2C INTERFACE

Unless otherwise noted, VCHG-IN = VDD = 5V, VBATT = 4V. Typical values and limits appearing in normal type apply for TJ =

25°C. Limits appearing in boldface type apply over the entire junction temperature range for operation, TJ = −40°C to

+125°C.

(1) (2) (3)

Limit

Symbol

Parameter

Conditions

Typ

Units

Min

Max

VIL

Low Level Input Voltage

SDA & SCL (2)

0.4

0.3 VDD

V

VIH

High Level Input Voltage

SDA & SCL (2)

0.7 VDD

VDD +0.5

V

VOL

Low Level Output Voltage

SDA & SCL (2)

0

0.2 VDD

V

VHYS

Schmitt Trigger Input Hysteresis

SDA & SCL (2)

0.1 VDD

V

FCLK

Clock Frequency

(2)

400

kHz

tHOLD

Hold Time Repeated START Condition

(2)

0.6

µs

tCLK-LP

CLK Low Period

(2)

1.3

µs

tCLK-HP

CLK High Period

(2)

0.6

µs

tSU

Set-Up Time Repeated START

(2)

0.6

µs

Condition

tDATA-HOLD

Data Hold Time

(2)

300

ns

tDATA-SU

Data Set-Up Time

(2)

100

ns

tSU

Set-Up Time for STOP Condition

(2)

0.6

µs

tTRANS

Maximum Pulse Width of Spikes that

(2)

must be Suppressed by the Input Filter

50

ns

of both DATA & CLK Signals.

(1)

All limits are specified. All electrical characteristics having room-temperature limits are tested during production with TJ = 25°C. All hot

and cold limits are specified by correlating the electrical characteristics to process and temperature variations and applying statistical

process control.

(2)

Specified by design.

(3)

LP3947 is not intended as a Li-Ion battery protection device, any battery used in this application should have an adequate internal

protection.

Figure 2. Li-Ion Charging Profile

6

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