Features Charger DC adapter or USB input Thermally regulated Charge Current Under Voltage Lockout 50 to 950 mA Programmable Charge Current 3.0V to 5.5V Input Voltage Range Thermal shutdown I 2C-compatible Interface for controlling Charger, LDO outputs and enabling Audio output LDO's 7 Low-Noise LDO’s 2 x 300 mA 3 x 150 mA 2 x 80 mA 2% (typ.) Output Voltage Accuracy on LDO's Audio Fully Differential Amplification Ability to drive capacitive loads up to 100 pF No output coupling capacitors, snubber networks or bootstrap capacitors required Space- Efficient 32-pin 5 x 5 mm LLP package Description The LP3921 is a fully integrated charger and multi-regulator unit with a fully differential Boomer audio power amplifier designed for CDMA cellular phones. The LP3921 has a high-speed serial interface which allows for the integration and control of a Li-Ion battery charger, 7 low-noise low-dropout (LDO) voltage regulators and a Boomer audio amplifier. The Li-Ion charger integrates a power FET, reverse current blocking diode, sense resistor with current monitor output, and requires only a few external components. Charging is thermally regulated to obtain the most efficient charging rate for a given ambient temperature. LDO regulators provide high PSRR and low noise ideally suited for supplying power to both analog and digital loads. The Boomer Audio Amplifier is capable of delivering 1.1 watts of continuous average power to an 8Ω BTL load with less than 1% distortion (THD+N). Boomer Audio Power Amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The Boomer Audio Amplifier does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for mobile phone and other low voltage applications where minimal power consumption and part count is the primary requirement. The Boomer Audio Amplifier contains advanced pop & click circuitry which eliminates noises during turn-on and turn-off transitions. Applications CDMA Phone Handsets Low Power Wireless Handsets Handheld Information Appliances Personal Media Players

	Block Diagram click for larger image typical app circuit

Datasheets

Title		Size	Date	Other Language
	LP3921 Battery Charger Management and Regulator Unit with Integrated Boomer Audio Amplifier	1320 Kbytes	14-Sep-08

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LP3921SQ/NOPB RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.15 each at 1K+ pcs	reel of 1000
LP3921SQE/NOPB RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.15 each at 1K+ pcs	reel of 250
LP3921SQX/NOPB RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.15 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 LP3921.

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 LP3921 is located at RoHS Status.

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LP3921SQ/NOPB	60.581	LLP	32	1	260	Detail	Download	N/A	NS UZXYTT L3921SQ
LP3921SQE/NOPB	60.581	LLP	32	1	260	Detail	Download	N/A	NS UZXYTT L3921SQ
LP3921SQX/NOPB	60.581	LLP	32	1	260	Detail	Download	N/A	NS UZXYTT L3921SQ

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 LP3921.

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 LP3921 is located at RoHS Status.

CAD Symbols and Models Download LP3921 CAD Symbols

Models N/A