LM4858LD National Semiconductor, LM4858LD Datasheet

LM4858LD

Manufacturer Part Number
LM4858LD
Description
Manufacturer
National Semiconductor
Datasheet

Specifications of LM4858LD

Operational Class
Class-AB
Audio Amplifier Function
Headphone/Speaker
Total Harmonic Distortion
1@32Ohm@95mW%
Single Supply Voltage (typ)
3/5V
Dual Supply Voltage (typ)
Not RequiredV
Supply Current (max)
7@5VmA
Power Supply Requirement
Single
Rail/rail I/o Type
No
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
LLP
Lead Free Status / Rohs Status
Not Compliant

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© 2003 National Semiconductor Corporation
LM4858
Mono 1.5 W / Stereo 300mW Power Amplifier
General Description
The LM4858 is an audio power amplifier capable of deliver-
ing 1.5W (typ) of continuous average power into a mono 4Ω
bridged-tied load (BTL) with 1% THD+N or 95mW per chan-
nel of continuous average power into stereo 32Ω single-
ended (SE) loads with 1% THD+N, using a 5V power supply.
The LM4858 can automatically switch between mono BTL
and stereo SE modes utilizing a headphone sense pin. It is
ideal for any system that provides both a monaural speaker
output and a stereo line or headphone output
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. Since the LM4858 does not require
bootstrap capacitors or snubber networks, it is optimally
suited for low-power portable systems.
The LM4858 features an externally controlled, micropower
consumption shutdown mode and thermal shutdown protec-
tion. The unity-gain stable LM4858’s gain is set by external
gain-setting resistors
Connection Diagrams
Boomer
®
is a registered trademark of National Semiconductor Corporation.
See NS Package Number MUB10A
Order Number LM4858MM
10 Lead MSOP
Top View
DS200647
20064729
Key Specifications
n Output Power at 1% THD+N, 1kHz:
n
n
n
n
n
n
n THD+N at 1kHz, 95mW into 32Ω SE
n Single Supply Operation
n Shutdown Current
Features
n Mono 1.5W BTL or stereo 300mW output
n Logic controlled headphone sense
n “Click and pop” suppression circuitry
n No bootstrap capacitors required
n Thermal shutdown protection
n Unity-gain stable
n Available in space-saving MSOP and LLP packaging
Applications
n Portable computers
n Desktop computers
n PDA’s
n Handheld games
LM4858LD 3Ω BTL
LM4858LD 4Ω BTL
LM4858MM 4Ω BTL
LM4858MM,LD 8Ω BTL
LM4858MM,LD 8Ω SE
LM4858MM,LD 32Ω SE
See NS Package Number LDA14A
Order Number LM4858LD
14 Lead LLP
Top View
www.national.com
20064728
300mW (typ)
95mW (typ)
2.4 to 5.5V
1.9W (typ)
1.7W (typ)
1.5W (typ)
1.1W (typ)
18µA (typ)
May 2003
1% (typ)

Related parts for LM4858LD

LM4858LD Summary of contents

Page 1

... Portable computers n Desktop computers n PDA’s n Handheld games 20064729 See NS Package Number LDA14A DS200647 May 2003 1.9W (typ) 1.7W (typ) 1.5W (typ) 1.1W (typ) 300mW (typ) 95mW (typ) 1% (typ) 2.4 to 5.5V 18µA (typ) 20064728 Top View 14 Lead LLP Order Number LM4858LD www.national.com ...

Page 2

Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit www.national.com 2 20064731 ...

Page 3

... Mode SHUTDOWN DD BTL Mode BTL OUT+ to BTL OUT− BTL Mode 3Ω L THD+N = 1%; LM4858LD BTL Mode 4Ω L THD+N = 1%; LM4858LD BTL Mode 4Ω L THD+N = 1%; LM4858MM BTL Mode 8Ω L THD+N = 1%; LM4858MM Mode 8Ω L THD+N = 1%; LM4858MM Mode 32Ω L THD+N = 1%; LM4858MM, LD SHUTDOWN, HP-IN SHUTDOWN, HP-IN SE Mode 32Ω ...

Page 4

... IC with no external series resistor (resistance of discharge path must be under 50Ω). Note 8: All voltages are measured with respect to the ground pin, unless otherwise specified. Note 9: Limits are guaranteed to National’s AOQL ( Average Outgoing Quality Level ). Note 10: The given θ is for an LM4858LD with the Exposed-DAP soldered to an exposed 1in JA www.national.com (Notes 3.3V 25˚ ...

Page 5

... Typical Performance Characteristics LD Specific Characteristics LM4858LD THD+N vs Frequency LM4858LD THD+N vs Output Power Functional Description 1/(2π 1/(2π Refer to the section, Proper Selection of External Components 1/(2π 200647A5 200647A7 5 . This resistor also forms LM4858LD THD+N vs Frequency 200647A6 LM4858LD THD+N vs Output Power 200647A8 www.national.com ...

Page 6

... Typical Performance Characteristics LD Specific Characteristics LM4858LD Power Dissipation vs Output Power Typical Performance Characteristics THD+N vs Frequency THD+N vs Frequency www.national.com (Continued) Power Derating Curve 200647A9 20064763 20064765 6 LM4858LD 200647B0 THD+N vs Frequency 20064764 THD+N vs Frequency 20064766 ...

Page 7

Typical Performance Characteristics THD+N vs Frequency THD+N vs Frequency THD+N vs Output Power (Continued) THD+N vs Frequency 20064767 THD+N vs Output Power 20064739 THD+N vs Output Power 20064741 7 20064768 20064740 20064742 www.national.com ...

Page 8

Typical Performance Characteristics THD+N vs Output Power THD+N vs Output Power THD+N vs Output Power www.national.com (Continued) THD+N vs Output Power 20064743 THD+N vs Output Power 20064745 Output Power vs Load Resistance 20064747 8 20064744 20064746 20064748 ...

Page 9

Typical Performance Characteristics Output Power vs Load Resistance Output Power vs Supply Voltage Power Dissipation vs Output Power (Continued) Output Power vs Supply Voltage 20064749 Dropout Voltage vs Supply Voltage 20064771 Power Dissipation vs Output Power 20064755 9 20064769 20064772 ...

Page 10

Typical Performance Characteristics Power Derating Curve Noise Floor Supply Current vs Supply Voltage www.national.com (Continued) 20064757 Open Loop Frequency Response 20064759 Power Supply Rejection Ratio 20064761 10 Channel Separation 20064780 20064762 20064760 ...

Page 11

Typical Performance Characteristics Application Information BRIDGED AND SINGLE-ENDED OPERATION As shown in Figure 1, the LM4858 contains three operational amplifiers (A1-A3). These amplifiers can be configured for SE or BTL modes. In the SE mode, the LM4858 operates as a ...

Page 12

Application Information amplifier’s closed-loop gain without causing excessive out- put signal clipping, please refer to the Audio Power Ampli- fier Design section. A bridge configuration, such as the one used in LM4858, also creates a second advantage over single-ended amplifi- ...

Page 13

Application Information The LM4858’s unity-gain stability allows a designer to maxi- mize system performance. The LM4858’s gain should be set no higher than necessary for any given application. A low gain configuration maximizes signal-to-noise performance and minimizes THD+N. However, a ...

Page 14

Application Information decreases with increasing load current. Reduced supply voltage causes decreased headroom, output signal clipping, and reduced output power. Even with tightly regulated sup- Demonstration Board Layout www.national.com plies, trace resistance creates the same effects as poor (Continued) supply ...

Page 15

Demonstration Board Layout FIGURE 4. Recommended MM PC Board Layout: (Continued) Bottom-Side Layout 15 200647B4 www.national.com ...

Page 16

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted 10-Lead Mini SOIC, 118 Mil Wide, .5mm Pitch PKG Order Number LM4858MM NS Package Number MUB10A 16 ...

Page 17

... National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. inches (millimeters) unless otherwise noted (Continued) 14-Lead LLP, 118 Mil Wide, .8mm Pitch PKG Order Number LM4858LD NS Package Number LDA14A 2. A critical component is any component of a life ...

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