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PDF LM4919 Data sheet ( Hoja de datos )
| Número de pieza | LM4919 | |
| Descripción | 1.5V/ Mono 85mW BTL Output/ 14mW Stereo Headphone Audio Amplifier | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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May 2004
LM4919
1.5V, Mono 85mW BTL Output, 14mW Stereo Headphone
Audio Amplifier
General Description
The unity gain stable LM4919 is both a mono-BTL audio
power amplifier and a Single Ended (SE) stereo headphone
amplifier. Operating on a single 1.5V supply, the mono BTL
mode delivers 85mW into an 8Ω load at 1% THD+N. In
Single Ended 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 cus-
tomer benefits include low profile and small size. This pack-
age minimizes 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 exter-
nal components and provide high quality output power in a
surface mount package.
Key Specifications
n Mono-BTL output power
n (RL = 8Ω, VDD = 1.5V, THD+N = 1%)
85mW (typ)
n Stereo Headphone output power
n (RL = 16Ω, VDD = 1.5V, THD+N = 1%) 14mW (typ)
n Micropower shutdown current
0.02µA (typ)
n Supply voltage operating range
0.9V < VDD < 2.5V
n PSRR 1kHz, VDD = 1.5V, RL = 16Ω
72dB (typ)
Features
n Single-cell 0.9V to 2.5V battery operation
n BTL mode for mono speaker
n Single ended headphone operation with coupling
capacitors
n Unity-gain stable
n "Click and pop" suppression circuitry
n Active low micropower shutdown
n Low current, active-low mute mode
n Thermal shutdown protection circuitry
Applications
n Portable one-cell audio products
n Portable one-cell electronic devices
Typical Application
FIGURE 1. Block Diagram
20082101
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation DS200821
www.national.com
1 page  
Typical Performance Characteristics
THD+N vs Frequency
VDD = 1.5V, PO = 5mW, RL = 16Ω
AV = –1, Single Ended Output
THD+N vs Frequency
VDD = 1.5V, RL = 8Ω, PO = 25mW
AV = -1, BTL Output
20082112
THD+N vs Frequency
VDD = 1.2V, PO = 5mW
RL = 16Ω, AV = -1, Single Ended Output
20082113
THD+N vs Frequency
VDD = 1.2V, RL = 8Ω, PO = 25mW
AV = -1, BTL Output
20082111
THD+N vs Output Power
VDD = 1.5V, RL = 16Ω, f = 1kHz
AV = -1, Single Ended Output
20082114
THD+N vs Output Power
VDD = 1.5V, RL = 8Ω, f = 1kHz
AV = -1, BTL Output
20082117
5
20082115
www.national.com
5 Page 
Application Information (Continued)
FIGURE 4. Recommended Circuit for Different Supply Turn-On Timing
20082153
FIGURE 5. Turn-On, Shutdown, and Mute Timing for Single-Ended
20082154
11 www.national.com
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet LM4919.PDF ] | |
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