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LM4897MM
1.1 Watt Audio Power Amplifier with Fade-In and Fade-Out
LM4897
1.1 Watt Audio Power Amplifier with Fade-In and
Fade-Out
General DescriptionThe LM4897isan audio power amplifier primarily designed
for demanding applicationsin mobile phones and other por-
table communication device applications.Itis capableof
delivering 1.1Wof continuous average powertoan8Ω BTL
load with less than 1% distortion (THD+N) froma +5VDC
power supply.
The LM4897 contains advanced pop and click circuitry that
eliminate noises which would otherwise occur during turn-on
and turn-off transitions.It also containsa fade-in/fade-out
feature that eliminates unnatural sound generated by
asserting/de-asserting the SHUTDOWN pin. The LM4897is
unity-gain stable and canbe configuredby external gain-
setting resistors.
The LM4897 featuresa low-power consumption global shut-
down mode, whichis achievedby driving the shutdownpin
with logic low. Additionally, the LM4897 featuresan internal
thermal shutdown protection mechanism.
Boomer audio power amplifiers were designed specificallyto
provide high quality output power witha minimal amountof
external components. The LM4897 doesnot require output
coupling capacitorsor bootstrap capacitors, and thereforeis
ideally suitedfor lower-power portable applications where
minimal space and power consumption are primary require-
ments.
Key Specifications Improved PSRRat 5V, 3V,& 217Hz 62dB (typ) HigherPOat 5V, THD+N=1% 1.1W (typ) HigherPOat 3V, THD+N=1% 350mW (typ) Shutdown Current 0.1µA (typ)
Features No output coupling capacitors, snubber networksor
bootstrap capacitors required Unity gain stable Ultra low current shutdown mode Fade-In/Fade-Out BTL output can drive capacitive loadsupto 100pF Advanced pop and click circuitry eliminates noises
during turn-on and turn-off transitions 2.6V- 5.5V operation Availableina space-saving SO package
Applications Mobile Phones PDAs Portable electronic devices
Connection Diagrams
Mini Small Outline (MSOP) Package MSOP MarkingTop View
Order Number LM4897MM
See NS package Number MUB10A
200509D0
Top View- Boomer Family- LM4897MMMay 2003
LM4897
att
Audio
Power
Amplifier
with
Fade-In
and
Fade-Out
