LM4892LDX National Semiconductor, LM4892LDX Datasheet

IC AMP AUDIO PWR 1W MONO 10LLP

LM4892LDX

Manufacturer Part Number
LM4892LDX
Description
IC AMP AUDIO PWR 1W MONO 10LLP
Manufacturer
National Semiconductor
Series
Boomer®r
Type
Class ABr
Datasheet

Specifications of LM4892LDX

Output Type
1-Channel (Mono) with Mono Headphones
Max Output Power X Channels @ Load
1W x 1 @ 8 Ohm; 90mW x 1 @ 32 Ohm
Voltage - Supply
2.2 V ~ 5.5 V
Features
Depop, Shutdown, Thermal Protection
Mounting Type
Surface Mount
Package / Case
10-LLP
Operational Class
Class-AB
Audio Amplifier Output Configuration
1-Channel Mono
Audio Amplifier Function
Headphone/Speaker
Total Harmonic Distortion
0.1@8Ohm@0.4W%
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
66dB
Single Supply Voltage (min)
2.2V
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
10
Package Type
LLP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
© 2002 National Semiconductor Corporation
LM4892
1 Watt Audio Power Amplifier with Headphone Sense
General Description
The LM4892 is an audio power amplifier primarily designed
for demanding applications in mobile phones and other por-
table 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
power supply. Switching between bridged speaker mode and
headphone (single-ended) mode is accomplished using the
headphone sense pin.
Boomer audio power amplifiers are designed specifically to
provide high quality output power with a minimal amount of
external components. The LM4892 does not require output
coupling capacitors or bootstrap capacitors, and therefore is
ideally suited for mobile phone and other low voltage appli-
cations where minimal power consumption is a primary re-
quirement.
The LM4892 features a low-power consumption shutdown
mode, which is achieved by driving the shutdown pin with
logic low. Additionally, the LM4892 features an internal ther-
mal shutdown protection mechanism.
The LM4892 contains advanced pop & click circuitry which
eliminates noise which would otherwise occur during turn-on
and turn-off transitions.
The LM4892 is unity-gain stable and can be configured by
external gain-setting resistors.
Typical Application
Boomer
®
is a registered trademark of National Semiconductor Corporation.
FIGURE 1. Typical Audio Amplifier Application Circuit (Pin #’s apply to M & MM packages)
DS200127
DC
Key Specifications
Features
n Available in space-saving packages: LLP, micro SMD,
n Ultra low current shutdown mode
n BTL output can drive capacitive loads up to 500pF
n Improved pop & click circuitry eliminates noise during
n 2.2 - 5.5V operation
n No output coupling capacitors, snubber networks or
n Thermal shutdown protection
n Unity-gain stable
n External gain configuration capability
n Headphone amplifier mode
Applications
n Mobile Phones
n PDAs
n Portable electronic devices
j
j
j
j
MSOP, and SOIC
turn-on and turn-off transitions
bootstrap capacitors required
Power Output at 5.0V & 1% THD
Power Output at 3.3V & 1% THD
Shutdown Current
PSRR at 217Hz, V
DD
20012701
= 5V, 8Ω Load
October 2002
400mW (typ)
www.national.com
0.1µA (typ)
62dB (typ)
1.0W (typ)

Related parts for LM4892LDX

LM4892LDX Summary of contents

Page 1

... The LM4892 is unity-gain stable and can be configured by external gain-setting resistors. Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit (Pin #’s apply to M & MM packages) Boomer ® registered trademark of National Semiconductor Corporation. © 2002 National Semiconductor Corporation Key Specifications j PSRR at 217Hz Power Output at 5.0V & 1% THD j Power Output at 3.3V & ...

Page 2

Connection Diagrams 8 Bump micro SMD Top View Order Number LM4892IBP, LM4892IBPX See NS Package Number BPA08DDB Mini Small Outline (MSOP) Package Top View Order Number LM4892MM See NS Package Number MUA08A SO Marking Top View XY - Date Code ...

Page 3

... 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 Thermal Resistance θ (SOP) JC θ ...

Page 4

Electrical Characteristics V The following specifications apply for V 25˚C. (Continued) Symbol Parameter PSSR Power Supply Rejection Ratio Electrical Characteristics V The following specifications apply for V Symbol Parameter I Quiescent Power Supply Current DD I Shutdown Current SD P ...

Page 5

External Components Description Components 4. C Supply bypass capacitor which provides power supply filtering. Refer to the Power Supply Bypassing S section for information concerning proper placement and selection of the supply bypass capacitor Bypass pin capacitor which ...

Page 6

Typical Performance Characteristics THD+N vs Power Out 5V, 8Ω THD+N vs Power Out 2.6V, 8Ω Power Supply Rejection Ratio (PSRR) vs Frequency 5V, 8Ω Input ...

Page 7

Typical Performance Characteristics Power Supply Rejection Ratio (PSRR) vs Frequency 2.6V, 8Ω Input terminated with 10Ω R Power Dissipation vs Output Power V = 3.3V DD Output Power vs Load Resistance (Continued) Power Supply Rejection ...

Page 8

Typical Performance Characteristics Supply Current vs Shutdown Voltage Open Loop Frequency Response Load DD Power Derating Curves www.national.com (Continued) Clipping (Dropout) Voltage vs 20012753 Open Loop Frequency Response 20012787 Power Derating Curves vs for 8 Bump ...

Page 9

Typical Performance Characteristics Frequency Response vs Input Capacitor Size THD+N vs Frequency 5V 32Ω, PWR = 70mW, Headphone mode DD L Output Power vs Supply Voltage R = 8Ω L (Continued) 20012754 THD+N vs Power ...

Page 10

Typical Performance Characteristics Output Power vs Supply Voltage R = 32Ω L Application Information BRIDGE CONFIGURATION EXPLANATION As shown in Figure 1, the LM4892 has two operational amplifiers internally, allowing for a few different amplifier configurations. The first amplifier’s gain ...

Page 11

Application Information requirements, click and pop performance (as explained in the section, Proper Selection of External Components), system cost, and size constraints. SHUTDOWN FUNCTION In order to reduce power consumption while not in use, the LM4892 contains a shutdown pin ...

Page 12

Application Information create pops upon device enable. Thus, by minimizing the capacitor size based on necessary low frequency response, turn-on pops can be minimized. Besides minimizing the input capacitor size, careful consid- eration should be paid to the bypass capacitor ...

Page 13

Application Information The LM4892 is unity-gain stable and requires no external components besides gain-setting resistors, an input coupling capacitor, and proper supply bypassing in the typical appli- cation. However closed-loop differential gain of greater than 10 is required, ...

Page 14

Application Information FIGURE 4. Reference Design Schematic For Demo Boards www.national.com (Continued) 14 20012775 ...

Page 15

Application Information LM4892 micro SMD BOARD ARTWORK (Continued) Silk Screen Top Layer Bottom Layer 15 20012757 20012758 20012759 www.national.com ...

Page 16

Application Information LM4892 SO DEMO BOARD ARTWORK Silk Screen Top Layer Bottom Layer www.national.com LM4892 MSOP DEMO BOARD ARTWORK (Continued) 20012762 20012763 20012764 16 Silk Screen 20012765 Top Layer 20012766 Bottom Layer 20012767 ...

Page 17

Application Information Composite View Top Layer LM4892 LLP DEMO BOARD ARTWORK (Continued) 20012790 20012792 17 Silk Screen 20012791 Bottom Layer 20012793 www.national.com ...

Page 18

Application Information Part Description LM4892 Audio Amplifier Tantalum Capacitor, 1µF Ceramic Capacitor, 0.39µF Capacitor, 100µF Resistor, 1kΩ, 1/10W Resistor, 20kΩ, 1/10W Resistor, 100kΩ, 1/10W Jumper Header Vertical Mount 2X1, 0.100’ spacing 3.5mm Audio Jack (PC mount, w/o nut ...

Page 19

Physical Dimensions inches (millimeters) unless otherwise noted Note: Unless otherwise specified. 1. Epoxy coating. 2. 63Sn/37Pb eutectic bump. 3. Recommend non-solder mask defined landing pad. 4. Pin 1 is established by lower left corner with respect to text orientation pins ...

Page 20

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted (Continued) MSOP Order Number LM4892MM NS Package Number MUA08A 20 ...

Page 21

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) SO Order Number LM4892M NS Package Number M08A 21 www.national.com ...

Page 22

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

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