LM4854MTX/NOPB National Semiconductor, LM4854MTX/NOPB Datasheet - Page 24

• Manufacturer Part Number: LM4854MTX/NOPB
• Description: IC AMP AUDIO PWR 2.3W AB 14TSSOP
• Manufacturer: National Semiconductor
• Series: Boomer®r
• Type: Class ABr

Specifications of LM4854MTX/NOPB

• Output Type: 1-Channel (Mono) with Stereo Headphones
• Max Output Power X Channels @ Load: 2.3W x 1 @ 3.2 Ohm; 200mW x 2 @ 16 Ohm
• Voltage - Supply: 2.4 V ~ 5.5 V
• Features: Depop, Shutdown, Standby, Thermal Protection
• Mounting Type: Surface Mount
• Package / Case: 14-TSSOP
• Operational Class: Class-AB
• Audio Amplifier Function: Headphone/Speaker
• Total Harmonic Distortion: 0.3@32Ohm@50mW%
• Single Supply Voltage (typ): 3/5V
• Dual Supply Voltage (typ): Not RequiredV
• Power Supply Requirement: Single
• Rail/rail I/o Type: No
• Power Supply Rejection Ratio: 71dB
• Single Supply Voltage (min): 2.4V
• Single Supply Voltage (max): 5.5V
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 14
• Package Type: TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM4854MTX

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Application Information
The product of the desired high frequency cutoff (100kHz in
this example) and the differential gain AVD, determines the
upper passband response limit. With AVD = 3 and fH =
100kHz, the closed-loop gain bandwidth product (GBWP) is
300kHz. This is less than the LM4854’s 3.5MHz GBWP. With
this margin, the amplifier can be used in designs that require
more differential gain while avoiding performance restricting
bandwidth limitations.
RECOMMENDED PRINTED CIRCUIT BOARD LAYOUT
Figures 5 through 9 show the recommended four-layer PC
board layout that is optimized for the micro SMD-packaged
LM4854 and associated external components. Figures 10
Demonstration Board Layout
FIGURE 5. Recommended microSMD PC Board
FIGURE 6. Recommended microSMD PC Board
Component-Side SilkScreen
Component-Side Layout
Layout:
Layout:
(Continued)
20038221
20038222
24
through 12 show the recommended two-layer PC board
layout that is optimized for the TSSOP-packaged LM4854
and associated external components. Figures 13 through 17
show the recommended four-layer PC board layout that is
optimized for the LLP-packaged LM4854 and associate ex-
ternal components.
These circuits are designed for use with an external 5V
supply and 8Ω(min) speakers.These circuit boards are easy
to use. Apply 5V and ground to the board’s V
pads, respectively. Connect a speaker between the board’s
L-OUT and BTL-OUT or headphones to the headphone jack
(L-OUT and R-OUT outputs).
FIGURE 7. Recommended microSMD PC Board
FIGURE 8. Recommended microSMD PC Board
Lower Inner-Layout Layer
Upper Inner-Layer Layout
Layout:
Layout:
DD
20038223
20038224
and GND