Features Pop & click circuitry eliminates noise during turn-on and turn-off transitions Low, 2µA (max) shutdown current Low, 11mA (typ) quiescent current (VDD = 4.2V, RL = 8) 1.8W mono BTL output, RL = 8, VDD = 3V Short circuit protection Unity-gain stable External gain configuration capability Description The LM4804 integrates a Boost Converter with an Audio Power Amplifier to drive voice coil speakers in portable applications. When powered by a 3V supply, it is capable of creating 1.8W power dissipation in an 8 bridge-tied-load (BTL) with less than 1% THD+N. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM4804 does not require bootstrap capacitors, or snubber circuits. Therefore it is ideally suited for portable applications requiring high output voltage and minimal size. The LM4804 features a micro-power shutdown mode. Additionally, the LM4804 features an internal thermal shutdown protection mechanism. The LM4804 contains advanced pop & click circuitry that eliminates output transients which would otherwise occur during power or shutdown cycles. The LM4804 is unity-gain stable. Its closed-loop gain is determined by the value of external, user selected resistors. Key Specification Quiescent Power Supply Current (VDD = 4.2V, RL = 8) 11mA (typ) BTL Output Power (RL = 8, 2% THD+N, VDD = 3V) 1.8W (typ) Shutdown Current 2µA (max) Applications Cellphone PDA

Typical Application click for larger image	Connection Diagram click for larger image
Typical Performance click for larger image

Datasheets

Title		Size	Date	Other Language
	LM4804 Low Voltage High Power Audio Power Amplifier	821 Kbytes	15-Jun-05

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM4804LQ/NOPB LM4804LQ RoHS Status	LLP	Not recommended for new designs (as of 5-Dec-06) Lead Time: 16 weeks	Distributor Region Qty DIGI-KEY Worldwide 1503 MOUSER Worldwide 1000	$2.00 each at 1K+ pcs	reel of 1000
LM4804LQX/NOPB LM4804LQX RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.90 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 LM4804.

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 LM4804 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
LM4804LQ/NOPB LM4804LQ	59.866 60.094	LLP	28	1 1	260 260	Detail	Download	N/A	NS UZXYTT L4804LQ
LM4804LQX/NOPB LM4804LQX	59.866 60.094	LLP	28	1 1	260 260	Detail	Download	N/A	NS UZXYTT L4804LQ

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 LM4804.

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 LM4804 is located at RoHS Status.

CAD Symbols and Models Download LM4804 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM4804LQ	CS065	2	47473	43	0	5527000	1	1568301341
LM4804LQX	CS065	2	47473	43	0	5527000	1	1568301341

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 LM4804.

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 LM4804 is located at RoHS Status.