Features Available in space saving 0.4mm pitch micro SMD package Fixed Logic Levels Ground referenced outputs High PSRR Ultra low current shutdown mode Improved pop & click circuitry eliminates noises during turn-on and turn-off transitions No output coupling capacitors, snubber networks, bootstrap capacitors, or gain-setting resistors required Shutdown either channel independently Soft start feature reduces start up transient current Description The LM48820 is a ground referenced, fixed-gain audio power amplifier capable of delivering 95mW of continuous average power into a 16Ω single-ended load, with less than 1% THD+N from a 3V power supply. The LM48820 features a new circuit technology that utilizes a charge pump to generate a negative reference voltage. This allows the outputs to be biased about ground, thereby eliminating output-coupling capacitors typically used with normal single-ended loads. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal number of external components. The LM48820 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for mobile phone and other portable applications. The LM48820 features a low-power consumption shutdown mode selectable for each channel and a soft start function that reduces start-up current transients. Additionally, the LM48820 features an internal thermal shutdown protection mechanism. The LM48820 contains advanced pop & click circuitry that eliminates noises which would otherwise occur during turn-on and turn-off transitions. The LM48820 has an internal fixed gain of 1.5V/V. Key Specification ■   Improved PSRR at 217Hz 80dB (typ) ■  Power Output at VDD = 3V,   RL = 16Ω, THD+N = 1% 95mW (typ) ■  Shutdown Current 0.05µA (typ) ■  Internal Fixed Gain 1.5V/V (typ) ■  Wide Operating Voltage Range 1.6V to 4.5V Applications Mobile Phones MP3 Players PDAs Portable electronic devices Notebook PCs

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

Parameters Values Supply Current 4.7 mA User Supply 3 Volt Power@ 16Ohms, 1% THD 0.095 Watt Power@ 32Ohms, 1% THD 0.080 Watt THD 0.007 % PSRR 80 dB SNR 100 dB Channels 2 Channels Shutdown Type Low Supply Min 1.6 Volt Supply Max 4.2 Volt Exposed DAP No Output Configuration True Ground Temperature Min -40 deg C Temperature Max 85 deg C AEC Q-100 Automotive Grade Undefined THD Conditions 50mW, f=1kHz, RL=32ohms single channel PSRR Conditions 200mVpp, input referred, f=217Hz SNR Conditions RL=32 ohms, Po=20mW, f= 1kHz, BW=10Hz to 22kHz Supply Range +1.6 - +4.2 V Capless Headphone Yes

Datasheets

Title		Size	Date	Other Language
	LM48820 Ground-Referenced, Ultra Low Noise, Fixed Gain, 95mW Stereo Headphone Amplifier	933 Kbytes	26-Jun-07

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM48820TM/NOPB LM48820TM RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty AITG Asia Pacific 350 DIGI-KEY Worldwide 0 FARNELL Europe and Asia 42 MOUSER Worldwide 750 RS COMPONENTS Worldwide 40	$0.90 each at 1K+ pcs	reel of 250
LM48820TMX/NOPB LM48820TMX RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$0.90 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 LM48820.

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 LM48820 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM48820TMBD/NOPB	Ground Referenced, Fixed-gain Audio Power Amplifier Evaluation Board	Full production Lead Free (RoHS)	Distributor Region Qty DIGI-KEY Worldwide 0 MOUSER Worldwide 1	$125.00 each	1
The LM48820 is a ground referenced, fixed-gain audio power amplifier capable of delivering 95mW of continuous average power into a 16Ω; single-ended load, with less than 1% THD+N from a 3V power supply. This LM488820TMBD is an evaluation board designed to ease the evaluation and effort during the development of a circuit using the LM48820TM. It is an easy to use stand-alone board that requires power and GND, an input signal and an output load. Features: Available in space saving 0.4mm pitch micro SMD package Fixed Logic Levels Ground referenced outputs High PSRR Ultra low current shutdown mode Improved pop & click circuitry eliminates noises during turn-on and turn-off transitions No output coupling capacitors, snubber networks, bootstrap capacitors, or gain-setting resistors required Shutdown either channel independently Soft start feature reduces start up transient current Applications: Mobile Phones MP3 Players PDAs Portable electronic devices Notebook PCs Contents: Fully Assembled LM48820 Demo board Instructions for where to locate and download the datasheet ***Please note: application information and board layout can be found in datasheet

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
LM48820TM/NOPB LM48820TM	3.397 3.397	MICRO SMD	14	1 1	260 260	Detail	Download	N/A	XYTT I GI7
LM48820TMX/NOPB LM48820TMX	3.397 3.397	MICRO SMD	14	1 1	260 260	Detail	Download	N/A	XYTT I GI7

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 LM48820.

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 LM48820 is located at RoHS Status.

CAD Symbols and Models Download LM48820 CAD Symbols

Models N/A