LP3947

SNVS298B – NOVEMBER 2004 – REVISED APRIL 2013

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RECOMMENDED OPERATING CONDITIONS

(1) (2)

CHG-IN

0.3V to 6.5V

EN, ISEL, MODE, SCL, SDA, VT

(3)

0V to 6V

Junction Temperature

−40°C to +125°C

Operating Temperature

−40°C to +85°C

Thermal Resistance

θJA

37°C/W

Maximum Power Dissipation (4)

1.21W

(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 ensured. Operating Ratings do not imply verified performance limits. For specified performance limits and

associated test conditions, see the Electrical Characteristics tables.

(2)

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

(3)

Caution must be taken to avoid raising pins EN and VT 0.3V higher than VCHG-IN and raising pins ISEL, MODE, SCL and SDA 0.3V

higher than VBATT.

(4)

Like the Absolute Maximum power dissipation, the maximum power dissipation for operation depends on the ambient temperature. The

1.21W rating appearing under Operating Ratings results from substituting the maximum junction temperature for operation, 125°C, for

TJ, 80°C for TA, and 37°C/W for θJA into (1) above. More power can be dissipated at ambient temperatures below 80°C. Less power can

be dissipated at ambient temperatures above 80°C. The maximum power dissipation for operation can be increased by 27 mW for each

degree below 80°C, and it must be de-rated by 27 mW for each degree above 80°C.

ELECTRICAL CHARACTERISTICS

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

VCC SUPPLY

VCHG-IN

Input Voltage Range

4.5

6

V

VUSB

4.3

6

ICC

Quiescent Current

VCHG-IN ≤ 4V

2

20

µA

EOC = Low, adaptor connected, VBATT =

50

150

4.1V

VOK-TSHD

Adaptor OK Trip Point (CHG-IN)

VCHG-IN –VBATT (Rising)

60

mV

VCHG-IN –VBATT (Falling)

50

mV

VUVLO-TSHD

Under Voltage Lock-Out Trip Point

VCHG-IN (Rising)

3.95

3.6

4.3

V

VCHG-IN (Falling)

3.75

3.4

4.1

V

VOVLO-TSHD

Over Voltage Lock-Out Trip Point

VCHG-IN (Rising)

5.9

V

VCHG-IN (Falling)

5.7

Thermal Shutdown Temperature

(2)

160

°C

Thermal Shutdown Hysteresis

20

BATTERY CHARGER

ICHG

Fast Charge Current Range

ISEL = High, In USB Mode

100

ISEL = Low, In USB Mode

500

mA

In AC Adaptor Mode

100

750

Fast Charge Current Accuracy

ICHARGE = 100 mA or 150 mA

−20

+20

mA

ICHARGE ≥ 200 mA

−10

+10

%

IPRE-CHG

Pre-Charge Current

VBATT = 2V

45

70

mA

(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.

4

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