LM4898_14 Datasheet, PDF (1/23 Pages) Texas Instruments – 1 Watt Fully Differential Audio Power Amplifier With Shutdown Select

LM4898, LM4898MMBD
www.ti.com
SNAS216D – MAY 2004 – REVISED MAY 2004
LM4898
1 Watt Fully Differential Audio Power Amplifier
With Shutdown Select
Check for Samples: LM4898, LM4898MMBD
FEATURES
1
•2 Fully Differential Amplification
• Available in Space-Saving Packages DSBGA,
VSSOP, and WSON
• Ultra Low Current Shutdown Mode
• Can Drive Capacitive Loads up to 500pF
• Improved Pop and Click Circuitry Eliminates
Noises During Turn-On and Turn-Off
Transitions
• 2.4 - 5.5V Operation
• No Output Coupling Capacitors, Snubber
Networks or Bootstrap Capacitors Required
• Shutdown High or Low Selectivity
APPLICATIONS
• Mobile Phones
• PDAs
• Portable Electronic Devices
KEY SPECIFICATIONS
• Improved PSRR at 217Hz: 83 dB(typ)
• Power Output at 5.0V, 1% THD: 1.0 W(typ)
• Power Output at 3.3V, 1% THD: 400 mW(typ)
• Shutdown Current: 0.1µA(typ)
DESCRIPTION
The LM4898 is a fully differential audio power
amplifier primarily designed for demanding
applications in mobile phones and other portable
communication device applications. It is capable of
delivering 1 watt of continuous average power to an
8Ω BTL load with less than 1% distortion (THD+N)
from a 5V_DC power supply.
Boomer audio power amplifiers were designed
specifically to provide high quality output power with a
minimal amount of external components. The
LM4898 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 is a primary
requirement.
The LM4898 features a low-power consumption
shutdown mode. To facilitate this, Shutdown may be
enabled by either logic high or low depending on
mode selection. Driving the shutdown mode pin either
high or low enables the shutdown select pin to be
driven in a likewise manner to enable Shutdown.
Additionally, the LM4898 features an internal thermal
shutdown protection mechanism.
The LM4898 contains advanced pop and click
circuitry which virtually eliminates noises which would
otherwise occur during turn-on and turn-off
transitions.
Connection Diagrams
Top View
Top View
Top View
Figure 1. VSSOP Package
Figure 2. WSON Package
See Package Number DGS0010A See Package Number NGZ0010B
Figure 3. 9 Bump DSBGA
Package
See Package Number
YZR0009AAA
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2004, Texas Instruments Incorporated