LM4951SDBD National Semiconductor, LM4951SDBD Datasheet

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LM4951SDBD

Manufacturer Part Number
LM4951SDBD
Description
BOARD EVALUATION LM4951SD
Manufacturer
National Semiconductor
Series
Boomer®r
Datasheet

Specifications of LM4951SDBD

Amplifier Type
Class AB
Output Type
1-Channel (Mono)
Max Output Power X Channels @ Load
1.8W x 1 @ 8 Ohm
Voltage - Supply
2.7 V ~ 9 V
Operating Temperature
-40°C ~ 85°C
Board Type
Fully Populated
Utilized Ic / Part
LM4951
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
© 2009 National Semiconductor Corporation
Wide Voltage Range 1.8 Watt Audio Amplifier
General Description
The LM4951 is an audio power amplifier primarily designed
for demanding applications in Portable Handheld devices. It
is capable of delivering 1.8W mono BTL to an 8Ω load, con-
tinuous average power, with less than 1% distortion (THD+N)
from a 7.5V
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. The LM4951 does not require boot-
strap capacitors, or snubber circuits.
The LM4951 features a low-power consumption active-low
shutdown mode. Additionally, the LM4951 features an inter-
nal thermal shutdown protection mechanism.
The LM4951 contains advanced pop & click circuitry that
eliminates noises which would otherwise occur during turn-on
and turn-off transitions.
The LM4951 is unity-gain stable and can be configured by
external gain-setting resistors.
Typical Application
* R
disabled when in shutdown mode, then R
Boomer
C
is needed for over/under voltage protection. If inputs are less than V
®
is a registered trademark of National Semiconductor Corporation.
DC
power supply.
FIGURE 1. Typical Bridge-Tied-Load (BTL) Audio Amplifier Application Circuit
200942
C
may be shorted.
LM4951
Key Specifications
Features
Applications
■ 
■ 
■ 
■ 
■ 
(V
1% THD
Pop & click circuitry eliminates noise during turn-on and
turn-off transitions
Low current, active-low shutdown mode
Low quiescent current
Thermal shutdown protection
Unity-gain stable
External gain configuration capability
Portable Handheld Devices up to 9V
Cell Phone
PDA
Wide Voltage Range
Quiescent Power Supply Current
Power Output BTL at 7.5V,
Shutdown Current
Fast Turn on Time
DD
= 7.5V)
DD
+0.3V and greater than –0.3V, and if inputs are
200942f4
March 18, 2009
www.national.com
0.01µA (typ)
2.5mA (typ)
2.7V to 9V
25ms (typ)
1.8W (typ)

Related parts for LM4951SDBD

LM4951SDBD Summary of contents

Page 1

... If inputs are less than V C disabled when in shutdown mode, then R FIGURE 1. Typical Bridge-Tied-Load (BTL) Audio Amplifier Application Circuit Boomer ® registered trademark of National Semiconductor Corporation. © 2009 National Semiconductor Corporation LM4951 Key Specifications ■  Wide Voltage Range ■ ...

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www.national.com 2 ...

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Connection Diagrams * DAP can either be soldered to GND or left floating. SD Package Top View Order Number LM4951SD See NS Package Number SDC10A 9 Bump micro SMD Package Top View Order Number LM4951TL, TLX See NS Package Number ...

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) Electrical Characteristics V The following specifications apply for V ...

Page 5

Symbol Parameter THD+N Total Harmomic Distortion + Noise1 THD+N Total Harmomic Distortion + Noise1 ε Output Noise OS PSRR Power Supply Rejection Ratio Note 1: All voltages are measured with respect to the GND pin, unless otherwise specified. Note 2: ...

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Typical Performance Characteristics THD+N vs Frequency V = 3.3V 100mW THD+N vs Frequency 400mW THD+N vs Frequency V = 7.5V 600mW www.national.com ...

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THD+N vs Output Power V = 3.3V 1kHz 6dB DD V 200942g1 THD+N vs Output Power 1kHz 6dB DD V 20094209 THD+N vs Output Power V = 7.5V, f ...

Page 8

Power Supply Rejection vs Frequency V = 3.3V 6dB RIPPLE Input Terminated into 10Ω Power Supply Rejection vs Frequency 6dB RIPPLE Input Terminated into 10Ω Power Supply ...

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Noise Floor V = 3.3V 6dB 20kΩ < 80kHz, A-weighted 20094219 Noise Floor 6dB 20kΩ ...

Page 10

Power Dissipation vs Output Power = 8Ω 1kHz V = 3.3V Supply Current vs Supply Voltage = 8Ω 0V Output Power vs Supply Voltage = 8Ω from ...

Page 11

Output Power vs Load Resistance V = 7.5V 1kHz DD from top to bottom: THD+N = 10%, THD Frequency Response vs Input Capacitor Size from top to bottom: C 200942f2 11 = 8Ω ...

Page 12

Application Information HIGH VOLTAGE BOOMER Unlike previous 5V Boomer® amplifiers, the LM4951 is de- signed to operate over a power supply voltages range of 2.7V to 9V. Operating on a 7.5V power supply, the LM4951 will deliver 1.8W into an ...

Page 13

LM4951's power supply pin and ground as short as possible. Connecting a larger capacitor, C BYPASS PASS pin and ground improves the internal bias voltage's stability and improves the amplifier's PSRR. The ...

Page 14

R and R . With the desired input impedance set at 20kΩ, the i f feedback resistor is found using Equation (10 V-BTL is 130kΩ (choose 191kΩ, the closest value). The ...

Page 15

Demonstration Board Layout FIGURE 2. Recommended TS SE PCB Layout: Top Silkscreen FIGURE 3. Recommended TS SE PCB Layout: Top Layer 15 200942f8 200942f7 www.national.com ...

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FIGURE 4. Recommended TS SE PCB Layout: Bottom Layer 16 200942f6 ...

Page 17

Revision History Rev 1.0 1.1 1.2 1.3 1.4 1.5 Date 8/25/04 10/19/05 Added the micro SMD pkg, then WEB. 08/30/06 Added the Limit value (=35) on the Twu (7.5V Elect Char table), then WEB. 09/11/06 Added the “Selecting Value For ...

Page 18

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted Order Number LM4951SD NS Package Number SDC10A Order Number LM4951TL, TLX NS Package Number TLA09ZZA X = 1.463±0.03 1.463±0.03 0.600±0.075 3 ...

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Notes 19 www.national.com ...

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... 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 and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www ...

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