LP3947

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SNVS298B – NOVEMBER 2004 – REVISED APRIL 2013

ELECTRICAL CHARACTERISTICS (continued)

Unless otherwise noted, VCHG-IN = 5V, VBATT = 4V, CCHG-IN = 1 µF, CBATT = 10 µF. 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 +85°C.

(1) (2) (3)

Limit

Symbol

Parameter

Conditions

Typ

Units

Min

Max

IEOC

End of Charge Current Accuracy

100 mA to 450 mA, 0.1C EOC Only (4)

−10

+10

mA

500 mA to 750 mA, All EOC Points

−20

+20

%

VBATT

Battery Regulation Voltage (For 4.1V

TJ = 0°C to +85°C

4.1

4.059

4.141

Cell)

TJ = −40°C to +85°C

4.1

4.038

4.162

V

Battery Regulation Voltage (For 4.2V

TJ = 0°C to +85°C

4.1

4.158

4.242

Cell)

TJ = −40°C to +85°C

4.2

4.137

4.263

VCHG-Q

Full Charge Qualification Threshold

VBATT Rising, Transition from Pre-Charge

3.0

V

to Full Current

VBAT-RST

Restart Threshold Voltage

VBATT Falling, Transition from EOC, to Pre-

3.9

3.77

4.02

(For 4.1V Cell)

Qualification State

V

Restart Threshold Voltage

VBATT Falling, Transition from EOC, to Pre-

4.00

3.86

4.12

(For 4.2V Cell)

Qualification State

RSENSE

Internal Current Sense Resistance

(2)

120

m

Ω

Internal Current Sense Resistor Load

1.2

A

Current

ICHGMON

Diff-Amp Output

ICHG = 50 mA

0.583

ICHG = 100 mA

0.663

V

ICHG = 750 mA

1.790

tOUT

Charger Time Out

TJ = 0°C to 85°C

5.625

4.78

6.42

Hrs

TJ = −40°C to +85°C

5.625

4.5

6.75

VOL

Low Level Output Voltage

EOC, CHG Pins each at 9 mA

100

mV

TEMPERATURE SENSE COMPARATORS

VUTLO

Low Voltage Threshold

Voltage at Ts Pin, Rising

2.427

V

Voltage at Ts Pin, Falling

2.369

VOTLO

High Voltage Threshold

Voltage at Ts Pin, Rising

1.470

V

Voltage at Ts Pin, Falling

1.390

VLDO

LDO Mode Voltage Threshold

Voltage at Ts Pin, % of VT

97

%

VT

Voltage Output

2.787

V

LDO MODE (Ts = HIGH)

VOUT

Output Voltage Regulation

ILOAD = 50 mA

4.10

V

ILOAD = 750 mA

4.06

LOGIC LEVELS

VIL

Low Level Input Voltage

EN, ISEL, MODE

0.4

V

VIH

High Level Input Voltage

EN, ISEL, MODE

2.0

V

IIL

Input Current

EN, ISEL = LOW

−10

+10

µA

MODE = LOW

−5

+5

µA

IIH

Input Current

EN, ISEL, MODE = HIGH

−5

+5

µA

(4)

The ±10 mA limits apply to all charge currents from 100 mA to 450 mA, to 0.1C End Of Charge (EOC). The limits increase proportionally

with higher EOC points. For example, at 0.2C, the End Of Charge current accuracy becomes ±20 mA.

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