LP3946LD ,Battery Charge Management SystemPin DescriptionPin # LP3945 LP3946 Description1 EN EN Charger Enable Input. Internally pulled high ..
LP3947ISD-51 ,USB/AC Adaptor, Single Cell Li-Ion Battery Charger ICPin DescriptionPin # Name Description1 EN Charger Enable Input. Internally pulled high to CHG-IN pi ..
LP3947ISD-51 ,USB/AC Adaptor, Single Cell Li-Ion Battery Charger ICFeaturesn Programmable Current Sourcesn Supports USB Charging Schemen Integrated Pass TransistorTyp ..
LP3947ISD-51/NOPB ,USB/AC Adaptor, Single Cell Li-Ion Battery Charger IC 14-WSON -40 to 85FEATURES DESCRIPTIONThe LP3947 is a complete charge management23• Supports USB Charging Schemesyste ..
LP3947ISDX-09 ,USB/AC Adaptor, Single Cell Li-Ion Battery Charger ICGeneral Descriptionn Monitors Battery TemperatureThe LP3947 is a complete charge management system ..
LP3950SL ,2.7 V to 2.9 V, color LED driver with audio synchronizerApplicationscolor LEDs (or RGB LEDs) can also be programmed ton Cellular phones, MP3/CD/minidisc pl ..
LT1028CSW ,Ultra Low Noise Precision High Speed Op Amps
LT1028CSW ,Ultra Low Noise Precision High Speed Op Amps
LT1028CSW ,Ultra Low Noise Precision High Speed Op Amps
LT1030C , QUADRUPLE LOW-POWER LINE DRIVER
LT1030CD ,Quadruple Low-Power Line Drivermaximum ratings” may cause permanent damage to the device. These are stress ratings only, andfuncti ..
LT1030CDR ,Quadruple Low-Power Line Drivermaximum ratings over operating free-air temperature range (unless otherwise noted)Supply voltage ra ..
LP3945EV-LP3945LD-LP3946LD
Battery Charge Management System
LP3945/LP3946
Battery Charge Management System
General DescriptionThe LP3945 and LP3946are complete charge management
systems that safely charge and maintaina Li-Ion batteryora
four-cell Ni-MH (LP3945 only) battery pack. The LP3945
offers the flexibilityof programming charge current, battery
regulation voltage (4.1V/4.2V), battery type (Li-Ion/Ni-MH),
and EndOf Charge (EOC) termination throughthe useofI2C
interface. On the LP3946, these parameters are pro-
grammedatthe factory per customer specification.
The pass transistor, charge current sensing resistor and
charge current setting resistors areall integrated inside the
LP3945 and LP3946. This eliminates the useof external
components and significantly reduces design time and board
space.
The LP3945 and LP3946 operatein four modes: pre-
qualification, constant current, constant voltage and mainte-
nance modes. The LP3945 features Ni-MH charging mode well. The charger has under-voltage and over-voltage
protectionas wellasan internal 5.6hr timerto prevent
overcharging the battery. There are two open drain outputs
for status indication.An internal amplifier readily convertsthe
charge current intoa voltage. Also, the charger can operatean LDO mode providingupto1 Amptothe load.
Features Integrated pass transistor Doesnot require external charge current settingor
sensing resistorsI2C interface (LP3945 only)— programmable charge
current, EOC current and battery regulation voltage Near-depleted battery preconditioning Built-in5.6 hour timer Under voltage and over voltage lockouton adaptor Charge status indicators Charge current monitor analog output LDO mode operation can source1 amp Continuous over current/temperature protection
Key Specifications 1% charger voltage accuracy over 0˚C≤TJ≤ 85˚C 4.5Vto 6.0V input voltage range LLP package power dissipation: 2.7WatTA= 25˚C
Applications Cellular phones PDAs Digital cameras USB powered devices Programmable current sources
Typical Application CircuitOctober 2003
LP3945/LP3946
Battery
Charge
Management
System
