LM4919 Datasheet, PDF (1/15 Pages) National Semiconductor (TI) – 1.5V, Mono 85mW BTL Output, 14mW Stereo Headphone Audio Amplifier

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 (R_L = 8Ω, V_DD = 1.5V, THD+N = 1%)
85mW (typ)
n Stereo Headphone output power
n (R_L = 16Ω, V_DD = 1.5V, THD+N = 1%) 14mW (typ)
n Micropower shutdown current
0.02µA (typ)
n Supply voltage operating range
0.9V < V_DD < 2.5V
n PSRR 1kHz, V_DD = 1.5V, R_L = 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
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