LM4911LDX National Semiconductor, LM4911LDX Datasheet

IC AMP AUDIO PWR .145W AB 10LLP

LM4911LDX

Manufacturer Part Number
LM4911LDX
Description
IC AMP AUDIO PWR .145W AB 10LLP
Manufacturer
National Semiconductor
Series
Boomer®r
Type
Class ABr
Datasheet

Specifications of LM4911LDX

Output Type
Headphones, 2-Channel (Stereo)
Max Output Power X Channels @ Load
145mW x 2 @ 16 Ohm
Voltage - Supply
2 V ~ 5.5 V
Features
Mute, Shutdown, Thermal Protection
Mounting Type
Surface Mount
Package / Case
10-LLP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LM4911LDX
Manufacturer:
NS
Quantity:
1 330
Part Number:
LM4911LDX
Manufacturer:
NS/国半
Quantity:
20 000
© 2008 National Semiconductor Corporation
LM4911
Stereo 40mW Low Noise Headphone Amplifier with
Selectable Capacitive Coupled or OCL Output
General Description
The LM4911 is an stereo audio power amplifier capable of
delivering 40mW per channel of continuous average power
into a 16Ω load or 25mW per channel into a 32Ω load at 1%
THD+N from a 3V power supply.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. Since the LM4911 does not require
bootstrap capacitors or snubber networks, it is optimally suit-
ed for low-power portable systems. In addition, the LM4911
may be configured for either single-ended capacitively cou-
pled outputs or for OCL outputs (patent pending).
The LM4911 features a low-power consumption shutdown
mode and a power mute mode that allows for faster turn on
time with less than 1mV voltage change at outputs on release.
Additionally, the LM4911 features an internal thermal shut-
down protection mechanism.
The LM4911 is unity gain stable and may be configured with
external gain-setting resistors.
Block Diagram
Boomer
®
is a registered trademark of National Semiconductor Corporation.
200314
FIGURE 1. Block Diagram
Key Specifications
Features
Applications
PSRR at 217Hz and 1kHz
Output Power at 1kHz with V
+N into a 16Ω load
Output Power at 1kHz with V
+N into a 16Ω load
Shutdown Current
Output Voltage change on release from Shutdown
V
Mute Current
OCL or capacitively coupled outputs (patent pending)
External gain-setting capability
Available in space-saving MSOP and LD packages
Ultra low current shutdown mode
Mute mode allows fast turn-on (1ms) with less than 1mV
change on outputs
2V - 5.5V operation
Ultra low noise
Portable CD players
PDAs
Portable electronics devices
DD
= 2.4V, R
L
= 16Ω (C-Coupled)
20031478
DD
DD
= 2.4V, 1% THD
= 3V, 1% THD
www.national.com
July 30, 2008
100µA (max)
2.0µA (max)
65dB (typ)
25mW
40mW
(max)
(typ)
(typ)
1mV

Related parts for LM4911LDX

LM4911LDX Summary of contents

Page 1

... The LM4911 is unity gain stable and may be configured with external gain-setting resistors. Block Diagram Boomer ® registered trademark of National Semiconductor Corporation. © 2008 National Semiconductor Corporation Key Specifications ■ PSRR at 217Hz and 1kHz ■ Output Power at 1kHz with V +N into a 16Ω ...

Page 2

Typical Application FIGURE 2. Typical Capacitive Coupled Output Configuration Circuit www.national.com FIGURE 3. Typical OCL Output Configuration Circuit 2 20031480 20031481 ...

Page 3

Connection Diagrams MSOP Package 20031479 Top View Order Number LM4911MM See NS Package Number MUB10A MSOP Marking 200314a9 Top View G-Boomer Family A3 - LM4911MM LD Package Top View Order Number LM4911LD See NS Package Number LDA10A 3 200314c0 www.national.com ...

Page 4

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Storage Temperature Input Voltage Power Dissipation (Note 3) ESD Susceptibility (Note 4) ESD Susceptibility (Note 5) Junction Temperature Electrical Characteristics V The following specifications apply for V ...

Page 5

Electrical Characteristics V The following specifications apply for V C. Symbol Parameter I Quiescent Power Supply Current DD I Shutdown Current SD I Mute Current M P Output Power O V Output Noise Voltage NO PSRR Power Supply Rejection Ratio ...

Page 6

Typical Performance Characteristics THD+N vs Frequency THD+N vs Frequency THD+N vs Frequency www.national.com THD+N vs Frequency 20031482 THD+N vs Frequency 20031484 THD+N vs Frequency 20031406 6 20031483 20031485 20031403 ...

Page 7

THD+N vs Frequency 20031405 THD+N vs Frequency 20031486 THD+N vs Frequency 20031488 THD+N vs Frequency THD+N vs Frequency THD+N vs Frequency 7 20031404 20031487 20031489 www.national.com ...

Page 8

THD+N vs Output Power THD+N vs Output Power THD+N vs Output Power www.national.com THD+N vs Output Power 20031490 THD+N vs Output Power 20031492 THD+N vs Output Power 20031408 8 20031491 20031493 20031407 ...

Page 9

THD+N vs Output Power 20031410 Output Resistance vs Load Resistance 20031413 Output Power vs Supply Voltage 20031494 THD+N vs Output Power Output Power vs Supply Voltage Output Power vs Supply Voltage 9 20031409 20031412 20031495 www.national.com ...

Page 10

Output Power vs Supply Voltage Output Power vs Load Resistance Power Dissipation vs. Output Power www.national.com Output Power vs Load Resistance 20031411 Power Dissipation vs. Output Power 20031497 Power Dissipation vs Output Power 20031499 10 20031496 20031498 200314a0 ...

Page 11

Channel Separation 200314a1 Channel Separation 20031417 Channel Separation 20031418 Channel Separation Channel Separation Channel Separation 11 200314a2 20031419 20031416 www.national.com ...

Page 12

Power Supply Rejection Ratio Power Supply Rejection Ratio Power Supply Rejection Ratio www.national.com Power Supply Rejection Ratio 200314a3 Power Supply Rejection Ratio 200314a5 Power Supply Rejection Ratio 20031420 12 200314a4 200314a6 20031423 ...

Page 13

Power Supply Rejection Ratio 20031421 Frequency Response vs Input Capacitor Size 20031427 Open Loop Frequency Response 200314a7 Power Supply Rejection Ratio Frequency Response vs Input Capacitor Size Supply Voltage vs Supply Current 13 20031422 20031426 20031424 www.national.com ...

Page 14

Clipping Voltage vs Supply Voltage Shutdown Hysteresis Voltage, Vdd=5V Power Derating Curve www.national.com 20031425 Shutdown Hysteresis Voltage, Vdd=3V 200314b1 200314b3 14 Noise Floor 200314a8 200314b2 ...

Page 15

Typical Performance Characteristics LM4911LD Specific Characteristics THD+N vs Frequency = 16Ω 5V 100mW, OCL O Power Dissipation vs Output Power = 16Ω 5V ≤ THD+N 1%, ...

Page 16

Application Information AMPLIFIER CONFIGURATION EXPLANATION As shown in Figure 1, the LM4911 has three operational am- plifiers internally. Two of the amplifier's have externally con- figurable gain while the other amplifier is internally fixed at the bias point acting as ...

Page 17

FIGURE 4. Recommended Circuit for Different Supply Turn-On Timing FIGURE 5. Turn-On, Shutdown, and Mute Timing for Cap-Coupled Mode 17 200314b6 200314b5 www.national.com ...

Page 18

... Further detailed and specific information concerning PCB lay- out, fabrication, and mounting an LD (LLP) package is avail- www.national.com able from National Semiconductor's Package Engineering Group under application note AN1187. POWER SUPPLY BYPASSING As with any amplifier, proper supply bypassing is important for low noise performance and high power supply rejection ...

Page 19

Mute section as well as shown in Figure 5. MUTE When in C-CUPL mode, the LM4911 also features a mute function that enables extremely fast turn-on/turn-off with a minimum of output pop and click ...

Page 20

As stated in the External Components section, R junction with C creates a i ≥ π 20kΩ * 20Hz) = 0.397µF; use 0.39µF. i The high frequency pole is determined by the product of the ...

Page 21

Physical Dimensions inches (millimeters) unless otherwise noted MSOP Order Number LM4911MM NS Package Number MUB10A LLP Order Number LM4911LD NS Package Number LDA10A 21 www.national.com ...

Page 22

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock Conditioners www.national.com/timing Data Converters www.national.com/adc Displays www.national.com/displays Ethernet www.national.com/ethernet Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www ...

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