Features Fully differential amplifier Externally configurable gain Soft start function Low power shutdown mode Under voltage lockout Description The LM48555 is an audio power amplifier designed to drive ceramic speakers in applications such as cell phones, smart phones, PDAs and other portable devices. The LM48555 produces 15.7VP-P with less than 1% THD+N while operating from a 3.2V power supply. The LM48555 features a low power shutdown mode, and differential inputs for improved noise rejection. The LM48555 includes advanced click and pop suppression that eliminates audible turn-on and turn-off transients. Additionally, the integrated boost regulator features a soft start function that minimizes transient current during power-up Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal number of external components. The LM48555 does not require bootstrap capacitors, or snubber circuits. The LM48555 is unity-gain stable and uses external gain-setting resistors. Key Specification ■  IDDQ (Boost Converter + Amplifier)   at VDD = 5V 7.5mA (typ) ■  Output Voltage Swing     VDD = 3.2V, THD ≤ 1% 15.7VP-P (typ) ■  Power Supply Rejection Ratio   f = 217Hz 80dB (typ) Applications Mobile phones PDA's Digital cameras

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

Parameters Values Voltage@ Vcc=5V, 1%THD 15.7 Volt Voltage@ Vcc=5V, 10% THD 16.0 Volt Load Conditions 1uF+20 ohm Supply Min 2.7 Volt Supply Max 6.5 Volt THD 1 % THD Conditions Rl=1uf+20ohm, f=1kHz Shutdown Type Low

Datasheets

Title		Size	Date	Other Language
	LM48555 Ceramic Speaker Driver	332 Kbytes	15-Mar-07

Application Notes

Title		Size	Date	Other Language
	AN-1611: Application Note 1611 LM48555 Evaluation Board	734 Kbytes	4-Apr-07

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM48555TL/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0 RS COMPONENTS Worldwide 14	$1.95 each at 1K+ pcs	reel of 250
LM48555TLX/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.95 each at 1K+ pcs	reel of 3000

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 LM48555.

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 LM48555 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM48555TLBD	LM48555TLBD Evaluation Board	Full production	Distributor Region Qty DIGI-KEY Worldwide 0 MOUSER Worldwide 1	$150.00 each	1

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
LM48555TL/NOPB	3.586	MICRO SMD	12	1	260	Detail	N/A	N/A	XVG I I4
LM48555TLX/NOPB	3.586	MICRO SMD	12	1	260	Detail	N/A	N/A	XVG I I4

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 LM48555.

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 LM48555 is located at RoHS Status.

CAD Symbols and Models N/A

Models N/A