LM4919MM National Semiconductor, LM4919MM Datasheet

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LM4919MM

Manufacturer Part Number
LM4919MM
Description
LM4919MM1.5V, Mono 85mW BTL Output, 14mW Stereo Headphone Audio Amplifier
Manufacturer
National Semiconductor
Datasheet
© 2011 National Semiconductor Corporation
1.5V, Mono 85mW BTL Output, 14mW Stereo Headphone
Audio Amplifier
General Description
The unity gain stable LM4919 is both a mono-BTL audio pow-
er amplifier and a Single Ended (SE) stereo headphone am-
plifier. Operating on a single 1.5V supply, the mono BTL mode
delivers 85mW into an 8Ω load at 1% THD+N. In Single End-
ed stereo headphone mode, the amplifier delivers 14mW per
channel into a 16Ω load at 1% THD+N.
With the LM4919 packaged in the MM package, the customer
benefits include low profile and small size. This package min-
imizes PCB area and maximizes output power.
The LM4919 features circuitry that reduces output transients
("clicks" and "pops") during device turn-on and turn-off, an
externally controlled, low-power consumption, active-low
shutdown mode, and thermal shutdown. Boomer audio power
amplifiers are designed specifically to use few external com-
ponents and provide high quality output power in a surface
mount package.
Typical Application
Boomer® is a registered trademark of National Semiconductor Corporation.
200821 Version 2 Revision 3
200821
FIGURE 1. Block Diagram
LM4919
Print Date/Time: 2011/09/30 15:48:41
Key Specifications
Features
Applications
Mono-BTL output power
Stereo Headphone output power
Micropower shutdown current
Supply voltage operating range
PSRR 1kHz, V
Single-cell 0.9V to 2.5V battery operation
BTL mode for mono speaker
Single ended headphone operation with coupling
capacitors
Unity-gain stable
"Click and pop" suppression circuitry
Active low micropower shutdown
Low current, active-low mute mode
Thermal shutdown protection circuitry
Portable one-cell audio products
Portable one-cell electronic devices
(R
(R
L
L
= 8Ω, V
= 16Ω, V
DD
DD
DD
= 1.5V, THD+N = 1%)
= 1.5V, R
= 1.5V, THD+N = 1%)
20082101
L
= 16Ω
September 30, 2011
0.9V < V
OBSOLETE
www.national.com
0.02µA (typ)
85mW (typ)
14mW (typ)
72dB (typ)
DD
< 2.5V

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LM4919MM Summary of contents

Page 1

... Boomer audio power amplifiers are designed specifically to use few external com- ponents and provide high quality output power in a surface mount package. Typical Application Boomer® registered trademark of National Semiconductor Corporation. © 2011 National Semiconductor Corporation 200821 Version 2 Revision 3 LM4919 Key Specifications ■ ...

Page 2

... Connection Diagrams www.national.com MSOP Package Top View Order Number LM4919MM See NS Package Number MUB10A for MSOP MSOP Marking 200821f9 Z - Plant Code X - Date Code T - Die Traceability G - Boomer Family B6 - LM4919MM 2 200821 Version 2 Revision 3 Print Date/Time: 2011/09/30 15:48:41 20082102 ...

Page 3

Typical Connections FIGURE 2. Typical Single Ended Output Configuration Circuit FIGURE 3. Typical BTL Speaker Configuration Circuit 200821 Version 2 Revision 3 3 Print Date/Time: 2011/09/30 15:48:41 20082103 20082105 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 2) ESD Susceptibility(Note 3) ESD Susceptibility (Note 4) Electrical Characteristics for the LM4919 The following specifications apply for the circuit shown in Figure 4 operating with V Limits apply for T = 25° ...

Page 5

Typical Performance Characteristics THD+N vs Frequency V = 1.5V 5mW –1, Single Ended Output V THD+N vs Frequency V = 1.2V 5mW 16Ω -1, Single ...

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THD+N vs Output Power = 16Ω 1kHz V = 1.5V -1, Single Ended Output V THD+N vs Output Power = 16Ω 1kHz V = 1.2V -1, ...

Page 7

Output Power vs Supply Voltage = 16Ω 1kHz -1, Single Ended Output V 20082106 Output Power vs Load Resistance V = 1.5V 1kHz DD Single Ended Output 200821e5 ...

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Output Power vs Load Resistance = 16Ω 1kHz V = 1.2V Single Ended Output, A Power Dissipation vs Output Power f = 1kHz Single Ended Output, Both Channels www.national.com = -1 V 200821e3 ...

Page 9

Channel Separation = 16Ω 5mW L O Single Ended Output 20082110 Power Supply Rejection Ratio V = 1.5V 200mV DD RIPPLE PP = 8Ω, BTL Output R L Input Terminated into ...

Page 10

Power Supply Rejection Ratio V = 1.2V RIPPLE = 8Ω, BTL Output R L Input Terminated into 10Ω Supply Voltage vs Supply Current Noise Floor V = 1.5V < 80kHz, Single Ended Output www.national.com = ...

Page 11

Shutdown Hysteresis Voltage V = 1.5V DD 200821e1 Mute Attenuation vs Load Resistance 200821f2 200821 Version 2 Revision 3 Power Derating Curve V = 1.5V DD Shutdown Current Distribution 11 Print Date/Time: 2011/09/30 15:48:41 200821f4 200821f7 www.national.com ...

Page 12

Application Information SINGLE ENDED (SE) CONFIGURATION EXPLANATION As shown in Figure 2, the LM4919 has two operational am- plifiers internally, which have externally configurable gain. The closed loop gain of the two configurable amplifiers is set by selecting the ratio ...

Page 13

FIGURE 4. Recommended Circuit for Different Supply Turn-On Timing FIGURE 5. Turn-On, Shutdown, and Mute Timing for Single-Ended 13 200821 Version 2 Revision 3 Print Date/Time: 2011/09/30 15:48:41 20082153 20082154 www.national.com ...

Page 14

POWER DISSIPATION Power dissipation is a major concern when designing a suc- cessful amplifier, whether the amplifier is bridged or single- ended. A direct consequence of the increased power delivered to the load by a bridge amplifier is an increase ...

Page 15

The LM4919 is unity-gain stable that gives the designer maximum system flexibility. The LM4919 should be used in low gain configurations to minimize THD+N values, and ...

Page 16

20kHz * 5 = 100kHz H As stated in the External Components section, R junction with ...

Page 17

... Physical Dimensions inches (millimeters) unless otherwise noted 200821 Version 2 Revision 3 MSOP Package Order Number LM4919MM NS Package Number MUB10A 17 Print Date/Time: 2011/09/30 15:48:41 www.national.com ...

Page 18

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com 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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