Features Supports USB Charging Scheme Integrated Pass Transistor Near-Depleted Battery Preconditioning Monitors Battery Temperature Built-In 5.6 hour timer Under Voltage and Over Voltage Lockout Charge Status Indicators Charge Current Monitor Analog Output LDO Mode Operation can source 1 Amp Continuous Over Current/Temperature Protection Description The LP3947 is a complete charge management system that safely charges and maintains a Li-Ion battery from either USB power source or AC adaptor. In USB mode, the LP3947 supports charging in low power or high power mode. Alternatively, the LP3947 can take charge from AC adaptor. In both USB and AC adaptor modes, charge current, battery regulation voltage, and End of Charge (EOC) point can be selected via I2C interface. The LP3947 can also operate on default values that are pre-programmed in the factory. The battery temperature is monitored continuously at the Ts pin to safeguard against hazardous charging conditions. The charger also has under-voltage and over-voltage protection as well as an internal 5.6 hr timer to protect the battery. The pass transistor and charge current sensing resistor are all integrated inside the LP3947. The LP3947 operates in four modes: pre-qualification, constant current, constant voltage and maintenance modes. There are two open drain outputs for status indication. An internal amplifier readily converts the charge current into a voltage. Also, the charger can operate in an LDO mode providing a maximum of 1.2 Amp to the load. Key Specification 1% Charger Voltage Accuracy Over 0°C <= TJ <= 85°C 4.3V to 6.0V Input Voltage Range 100 mA to 750 mA charge current range, in charger mode 100mA to 500mA charge current range, in USB mode LLP Package Power Dissipation: 2.7W at TA = 25°C Applications Cellular Phones PDAs Digital Cameras USB Powered Devices Programmable Current Sources

Typical Application click for larger image	Block Diagram click for larger image

Parameters Values Full Charge Vmax 4.2 Volt Input Min Voltage 4.3 Volt Input Max Voltage 6 Volt Battery Cells 1 cell Battery Chemistry Li-Ion Charge Current 100 to 750mA (wall), 100 or 500mA (USB) Charge Modes Prequal, CC, CV, maintenance On/Off Pin Yes Special Features Accepts either AC adapter or USB power source, includes battery temperature monitoring, LDO mode, safety timer, charge status indicator Full Charge Vmin 4.1 Volt PowerGood / Error Flag No Adjustable Output Yes Voltage Fault Protection No Output Current 750 mA RegType Linear/LDO Controller Temperature Min -40 deg C Temperature Max 85 deg C PowerWise Yes

Datasheets

Title		Size	Date	Other Language
	LP3947 USB/AC Adaptor, Single Cell Li-Ion Battery Charger IC	649 Kbytes	6-Jul-06

Application Notes

Title		Size	Date	Other Language
	AN-1341: Application Note 1341 LP3947 Evaluation Board	584 Kbytes	18-Nov-04

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LP3947ISD-09/NOPB LP3947ISD-09 RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 705 MOUSER Worldwide 1000 RS COMPONENTS Worldwide 20 TAYLOR Americas 1000	$1.13 each at 1K+ pcs	reel of 1000
LP3947ISD-51/NOPB LP3947ISD-51 RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 1000 DIGI-KEY Worldwide 1669 FARNELL Europe and Asia 100 MOUSER Worldwide 1000 RS COMPONENTS Worldwide 910 TAYLOR Americas 1000	$1.13 each at 1K+ pcs	reel of 1000
LP3947ISDX-51/NOPB LP3947ISDX-51 RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.13 each at 1K+ pcs	reel of 4500

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LP3947.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LP3947 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LP3947ISD-51EV	USB/AC Adaptor, Single Cell Li-Ion Battery Charger IC	Full production	Distributor Region Qty DIGI-KEY Worldwide 0	$142.00 each	1
USB/AC Adaptor, Single Cell Li-Ion Battery Charger IC Features: The LP3947 is a complete charge management system that safely charges and maintains a Li-Ion battery from either USB power source or AC adaptor. In USB Mode, the LP3947 supports charging in low power or high power mode. Alternatively, the LP3947 can take charge from AC adaptor. Near-Depleted Battery Preconditioning Monitors Battery Temperature Built-In 5.6 hour timer Under Voltage and Over Voltage Lockout Charge Status Indicators Charge Current Monitor Analog Output LDO MOde Operation can source 1 Amp Continuous Over Current/Temperature Protection Key Specifications: 1% charger voltage accuracy over 0°C° less than or equal to TJ less than or equal to 85°C 4.3V to 6.0V input voltage range 100 mA to 750 mA charge current range, in charger mode 100 mA to 500 mA charge current range, in USB mode LLP package power dissipation: 2.7W at TA = 25°C Applications: Cellular phones PDAs Digital Cameras USB powered devices Programmable current sources

National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

Lead Free product status is available through the search tool located here

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LP3947ISD-09/NOPB LP3947ISD-09	40.451 40.603	LLP	14	1 1	260 260	Detail	Download	N/A	NS UZXYTT L00061B
LP3947ISD-51/NOPB LP3947ISD-51	40.451 40.603	LLP	14	1 1	260 260	Detail	Download	N/A	NS UZXYTT L00062B
LP3947ISDX-51/NOPB LP3947ISDX-51	40.451 40.603	LLP	14	1 1	260 260	Detail	Download	N/A	NS UZXYTT L00062B

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LP3947.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LP3947 is located at RoHS Status.

CAD Symbols and Models Download LP3947 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LP3947ISD-09	CMOS7	0	21301	0	0	1584000	3	449464325
LP3947ISD-51	CMOS7	0	21301	0	0	1584000	3	449464325
LP3947ISDX-51	CMOS7	0	21301	0	0	1584000	3	449464325

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LP3947.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LP3947 is located at RoHS Status.