LP3947 datasheet(5/14 Pages) NSC

5 / 14 page

Electrical Characteristics (Continued)

Unless otherwise noted, V

CHG-IN = 5V, VBATT = 4V, CCHG-IN = 1 µF, CBATT = 10 µF. Typical values and limits appearing in nor-

mal type apply for T

J = 25˚C. Limits appearing in boldface type apply over the entire junction temperature range for operation,

J = −40˚C to +85˚C. (Notes 7, 8, 9)

Symbol

Parameter

Conditions

Typ

Limit

Units

Min

Max

BATTERY CHARGER

BAT-RST

Restart Threshold Voltage

(For 4.1V Cell)

BATT Falling, Transition from EOC,

to Pre-Qualification State

3.9

3.77

4.02

Restart Threshold Voltage

(For 4.2V Cell)

BATT Falling, Transition from EOC,

to Pre-Qualification State

4.00

3.86

4.12

SENSE

Internal Current Sense Resistance

(Note 8)

120

Ω

Internal Current Sense Resistor

Load Current

1.2

ICHG

MON

Diff-Amp Output

CHG = 50 mA

0.583

CHG = 100 mA

0.663

CHG = 750 mA

1.790

OUT

Charger Time Out

J = 0˚C to 85˚C

5.625

4.78

6.42

Hrs

J = −40˚C to +85˚C

5.625

4.5

6.75

Low Level Output Voltage

EOC, CHG Pins each at 9 mA

100

TEMPERATURE SENSE COMPARATORS

UTLO

Low Voltage Threshold

Voltage at Ts Pin, Rising

2.427

Voltage at Ts Pin, Falling

2.369

OTLO

High Voltage Threshold

Voltage at Ts Pin, Rising

1.470

Voltage at Ts Pin, Falling

1.390

LDO

LDO Mode Voltage Threshold

Voltage at Ts Pin, % of V

Voltage Output

2.787

LDO MODE (Ts = HIGH)

OUT

Output Voltage Regulation

LOAD = 50 mA

4.10

LOAD = 750 mA

4.06

LOGIC LEVELS

Low Level Input Voltage

EN, ISEL, MODE

0.4

High Level Input Voltage

EN, ISEL, MODE

2.0

Input Current

EN, ISEL = LOW

−10

+10

µA

MODE = LOW

−5

µA

Input Current

EN, ISEL, MODE = HIGH

−5

µA

Electrical Characteristics, I

2C Interface

Unless otherwise noted, V

CHG-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, T

J = −40˚C to +125˚C.

(Notes 7, 8, 9)

Symbol

Parameter

Conditions

Typ

Limit

Units

Min

Max

Low Level Input Voltage

SDA & SCL (Note 8)

0.4

0.3 V

High Level Input Voltage

SDA & SCL (Note 8)

0.7 V

DD +0.5

Low Level Output Voltage

SDA & SCL (Note 8)

0.2 V

HYS

Schmitt Trigger Input Hysteresis

SDA & SCL (Note 8)

0.1 V

CLK

Clock Frequency

(Note 8)

400

kHz

HOLD

Hold Time Repeated START

Condition

(Note 8)

0.6

µs

CLK-LP

CLK Low Period

(Note 8)

1.3

µs

CLK-HP

CLK High Period

(Note 8)

0.6

µs

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