LM4992SDBD/NOPB National Semiconductor, LM4992SDBD/NOPB Datasheet

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LM4992SDBD/NOPB

Manufacturer Part Number
LM4992SDBD/NOPB
Description
Manufacturer
National Semiconductor
Datasheet
1.LM4992SDBDNOPB.pdf (16 pages)

Specifications of LM4992SDBD/NOPB

Lead Free Status / Rohs Status
Compliant
© 2004 National Semiconductor Corporation
LM4992
420mW Stereo Cell Phone Audio Amplifier
General Description
The LM4992 is a stereo audio power amplifier primarily
designed for demanding applications in mobile phones and
other portable communication device applications. It is ca-
pable of delivering 1 watt, per channel, of continuous aver-
age power to an 8Ω BTL load with less than 1% distortion
(THD+N) from a 5V
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. The LM4992 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 LM4992 features independent shutdown control for
each channel and a low-power consumption shutdown
mode, which is achieved by driving both shutdown pins with
logic low. Additionally, the LM4992 features an internal ther-
mal shutdown protection mechanism.
The LM4992 contains advanced pop & click circuitry which
eliminates noise which would otherwise occur during turn-on
and turn-off transitions.
The LM4992 is unity-gain stable and can be configured by
external gain-setting resistors.
Connection Diagram
Boomer
®
is a registered trademark of National Semiconductor Corporation.
DC
power supply.
DS200761
See NS Package Number SDA14A
Order Number LM4992SD
Top View
SDA14A
Key Specifications
Features
n Available in space-saving LLP package
n Ultra low current shutdown mode
n BTL output can drive capacitive loads
n Improved pop & click circuitry eliminates noise during
n 2.2 - 5.5V operation
n No output coupling capacitors, snubber networks or
n Unity-gain stable
n External gain configuration capability
Applications
n Mobile Phones
n PDAs
n Portable electronic devices
j
j
j
j
turn-on and turn-off transitions
bootstrap capacitors required
1% THD, 8Ω
1% THD, 8Ω
Improved PSRR at 217Hz & 1KHz
Stereo Output Power at 5.0V,
Stereo Output Power at 3.3V,
Shutdown Current, V
200761E6
dd
= 3.3V
February 2004
64dB (1KHz)
420mW (typ)
www.national.com
1.07W (typ)
0.2µA (typ)

LM4992SDBD/NOPB Summary of contents

Page 1

... The LM4992 is unity-gain stable and can be configured by external gain-setting resistors. Connection Diagram Boomer ® registered trademark of National Semiconductor Corporation. © 2004 National Semiconductor Corporation Key Specifications j Improved PSRR at 217Hz & 1KHz j Stereo Output Power at 5.0V, 1% THD, 8Ω ...

Page 2

Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit www.national.com 2 200761E7 ...

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 (Note 10) Storage Temperature Input Voltage Power Dissipation (Notes 3, 11) ESD Susceptibility (Note 4) ESD Susceptibility (Note 5) Electrical Characteristics V The following specifications apply for the circuit shown in Figure 1, unless otherwise specified. Limits apply for T ...

Page 4

Electrical Characteristics V The following specifications apply for the circuit shown in Figure 1, unless otherwise specified. Limits apply for T Symbol Parameter I Quiescent Power Supply Current DD I Shutdown Current SD V Shutdown Voltage Input High SDIH V ...

Page 5

External Components Description (Figure 1) Components 1. R Inverting input resistance which sets the closed-loop gain in conjunction with R i high pass filter with Input coupling capacitor which blocks the DC voltage at the amplifiers input ...

Page 6

Typical Performance Characteristics THD+N vs Power Out 3.3V, 8Ω 1kHz, per channel Power Supply Rejection Ratio (PSRR) vs Frequency 5V, 8Ω Input terminated with 10Ω Power Supply Rejection Ratio (PSRR) ...

Page 7

Typical Performance Characteristics Power Supply Rejection Ratio (PSRR) vs Frequency 2.6V, 8Ω Input terminated with 10Ω Open Loop Frequency Response, 5V Open Loop Frequency Response, 2.6V (Continued) Power Supply Rejection Ratio (PSRR) vs Frequency L ...

Page 8

Typical Performance Characteristics Crosstalk vs Frequency 5V, 8Ω OUT Crosstalk vs Frequency 2.6V, 8Ω 200mW OUT Power Dissipation vs Output Power, 3.3V, 8Ω, per channel www.national.com (Continued) Crosstalk vs Frequency 3.3V, 8Ω, P 200761G7 Power ...

Page 9

Typical Performance Characteristics Shutdown Hysteresis Voltage 5V Shutdown Hysteresis Voltage 2.6V Frequency Response vs Input Capacitor Size (Continued) Shutdown Hysteresis Voltage 200761H3 200761H4 200761H6 9 3.3V 200761H4 Output Power vs Supply Voltage, 8Ω 200761H5 Wakeup Time vs Supply Voltage 200761H7 ...

Page 10

Application Information BRIDGE CONFIGURATION EXPLANATION As shown in Figure 1, the LM4992 has two internal opera- tional amplifiers per channel. The first amplifier’s gain is externally configurable , while the second amplifier is inter- nally fixed in a unity-gain, inverting ...

Page 11

Application Information typical value of 0.2µA. In either case, the shutdown pin should be tied to a definite voltage to avoid unwanted state changes. In many applications, a microcontroller or microprocessor output is used to control the shutdown circuitry, which ...

Page 12

Application Information nates possible high frequency oscillations. Care should be taken when calculating the -3dB frequency in that an incor- rect combination of R and C will cause rolloff before 3 4 20kHz. A typical combination of feedback resistor and ...

Page 13

Application Information SCHEMATIC DRAWING (Continued) FIGURE 2. Higher Gain Schematic Drawing 13 200761I2 www.national.com ...

Page 14

Demonstration Board Layout www.national.com Recommended LLP Board Layout: Top Overlay Recommended LLP Board Layout: Top Layer 14 200761E8 200761E9 ...

Page 15

Demonstration Board Layout (Continued) Recommended LLP Board Layout: Bottom Layer 15 200761F0 www.national.com ...

Page 16

... BANNED SUBSTANCE COMPLIANCE National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...