Datasheet
14 13 12 11 10 9 8
1 2 3 4 5 6 7
LP3947
SNVS298B –NOVEMBER 2004–REVISED APRIL 2013
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These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
CONNECTION DIAGRAMS AND PACKAGE MARK INFORMATION
Figure 1. Package Number NHL0014B (Top View)
PIN DESCRIPTIONS
Pin # Name Description
1 EN Charger Enable Input. Internally pulled high to CHG-IN pin. A HIGH enables the charger and a LOW disables the
charger.
2 SCL I
2
C serial Interface Clock input.
3 SDA I
2
C serial Interface Data input/out.
4 BATT Battery supply input terminal. Must have 10 µF ceramic capacitor to GND
5 V
T
Regulated 2.78V output used for biasing the battery temperature monitoring thermistor.
6 VB
SENSE
Battery Voltage Sense connected to the positive terminal of the battery.
7 MODE Select pin between AC adaptor and USB port. A LOW sets the LP3947 in USB port and a HIGH sets it in the AC
adaptor.
8 Diff-Amp Charge current monitoring differential amplifier output. Voltage output representation of the charge current.
9 Ts Multi function pin. Battery temperature monitoring input and LDO/Charger mode.
Pulling this pin to V
T
, or removing the thermistor by physically disconnecting the battery, sets the device in LDO
mode.
10 EOC Active Low Open Drain Output. Active when USB port or AC adaptor is connected and battery is fully charged. For
more information, refer to “LED Charge Status Indicators” section.
11 GND Ground
12 CHG Active Low Open Drain Output. Active when USB port or AC adaptor is connected and battery is being charged.
For more information, refer to “LED Charge Status Indicators” section.
13 ISEL Control pin to switch between low power (100 mA) mode and high power (500 mA) mode in USB mode. This pin
is pulled high internally as default to set the USB in 100 mA mode. This pin has to be externally pulled low to go
into 500 mA mode.
14 CHG-IN Charger input from a regulated, current limited power source. Must have a 1 µF ceramic capacitor to GND
Table 1. ORDERING INFORMATION
Part Number Default Options Top-Side Markings
LP3947ISD-09 I
CHG
= 500 mA L00061B
V
BATT
= 4.1V
EOC = 0.1C
LP3947ISD-51 I
CHG
= 500 mA L00062B
V
BATT
= 4.2V
EOC = 0.1C
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