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LM4804

Texas Instruments
Part Number LM4804
Manufacturer Texas Instruments
Description Low Voltage High Power Audio Power Amplifier
Published Aug 22, 2019
Detailed Description LM4804 www.ti.com SNAS268C – MARCH 2005 – REVISED APRIL 2013 LM4804 Boomer™ Audio Power Amplifier SerieLow Voltage Hi...
Datasheet PDF File LM4804 PDF File

LM4804
LM4804

Overview
LM4804 www.
ti.
com SNAS268C – MARCH 2005 – REVISED APRIL 2013 LM4804 Boomer™ Audio Power Amplifier SerieLow Voltage High Power Audio Power Amplifier Check for Samples: LM4804 FEATURES 1 •23 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 = 8Ω) • 1.
8W Mono BTL Output, RL = 8Ω, VDD = 3V • Short Circuit Protection • Unity-Gain Stable • External Gain Configuration Capability APPLICATIONS • Cellphone • PDA KEY SPECIFICATIONS • Quiescent Power Supply Current (VDD = 4.
2V, RL = 8Ω), 11mA (Typ) • BTL Output Power (RL = 8Ω, 2% THD+N, VDD = 3V), 1.
8W (Typ) • Shutdown Current, 2µA (Max) 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 8Ω 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.
Connection Diagram FB FREQ SD1 GND2 NC NC GND3 NC NC GND1 NC VDD BOOT SW 28 27 26 25 24 23 22 1 21 2 20 3 19 4 18 5 17 6 16 7 15 8 9 10 11 12 13 14 NC NC BYPASS SD2 NC NC NC ININ+ NC VO1 V1 NC VO2 Figure 1.
LM4804LQ (5x5) Top View See Package Number NJB0028A 1 Please be aware that an important notice ...


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