LP3918

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SNVS476D – AUGUST 2007 – REVISED MAY 2013

Charger Electrical Characteristics

Unless otherwise noted, VCHG-IN = 5V, VIN ( = VIN1 = VIN2 = BATT) = 3.6V.CCHG_IN = 10µF, CBATT = 30µF. Charger set to

default settings unless otherwise noted. 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, Ta = TJ = −25°C to +85°C.

(1) (2)

Limit

Symbol

Parameter

Condition

Typ

Units

Min

Max

VCHG-IN

Input Voltage

4.5

6.5

Range

V

Operating Range

4.5

6

VOK_CHG

CHG_IN OK trip-

VCHG_IN - VBATT (Rising)

200

mV

point

VCHG_IN - VBATT (Falling)

50

VTERM

Battery Charge

Default

4.2

V

Termination

voltage

VTERM voltage

TJ = 25°C

-0.35

+0.35

%

tolerance

TJ = 0°C to 85°C

-1

+1

ICHG

Fast Charge

ICHG = 450mA

-10

+10

%

Current Accuracy

Programmable full-

6.0V

≥ VCHG_IN ≥ 4.5V

50

950

mA

rate charge current

VBATT < (VCHG_IN - VOK_CHG)

range(default

VFULL_RATE < VBATT < VTERM

100mA)

(3)

Default

100

Charge current

50

programming step

IPREQUAL

Pre-qualification

VBATT = 2V

50

40

60

mA

current

ICHG_USB

CHG_IN

5.5V

≥ VCHG_IN ≥

Low

programmable

4.5V

100

current in USB

VBATT < (VCHG_IN -

mode

VOK_CHG)

mA

VFULL_RATE < VBATT

High

450

< VTERM

Default = 100mA

100

VFULL_RATE

Full-rate

VBATT rising, transition from pre-qual to

3.0

2.9

3.1

qualification

full-rate charging

V

threshold

IEOC

End of Charge

0.1C option selected

10

Current, % of full-

%

rate current

VRESTART

Restart threshold

VBATT falling, transition from EOC to full-

4.05

3.97

4.13

voltage

rate charge mode. Default options

V

selected - 4.05V

IMON

IMON Voltage 1

ICHG = 100mA

0.247

V

IMON Voltage 2

ICHG = 450mA

1.112

0.947

1.277

TREG

Regulated junction

(4)

115

°C

temperature

(1)

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)

Junction-to-ambient thermal resistance (

θJA) is taken from thermal modelling result, performed under the conditions and guidelines set

forth in the JEDEC standard JESD51-7. The value of (

θJA) of this product could fall within a wide range, depending on PWB material,

layout, and environmental conditions. In applications where high maximum power dissipation exists (high VIN, high IOUT), special care

must be paid to thermal dissipation issues in board design.

(3)

Full charge current is specified for CHG_IN = 4.5 to 6.0V. At higher input voltages, increased power dissipation may cause the thermal

regulation to limit the current to a safe level, resulting in longer charging time.

(4)

Specified by design. Not production tested.

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