LM4914 Datasheet, PDF (1/15 Pages) National Semiconductor (TI) – 1W Monaural, 85mW Stereo Headphone Audio Amplifier

March 2003
LM4914
1W Monaural, 85mW Stereo Headphone Audio Amplifier
General Description
The unity-gain stable LM4914 is both a mono differential
output (for bridge-tied loads, or BTL) audio power amplifier
and a single-ended (SE) stereo headphone amplifier. Oper-
ating on a single 5V supply, the mono BTL mode delivers 1W
into an 8Ω load. In SE stereo mode, the amplifier delivers
85mW to 32Ω loads. The LM4914 features circuitry that
suppresses output transients ("clicks and pops").
The LM4914 is designed for notebook and other handheld
portable applications. It delivers high quality output power
from a surface-mount package and requires few external
components. The LM4914 is pin and functionally compatible
with the TPA0253.
Other features include an active-low micro-power shutdown
mode and thermal shutdown protection.
The LM4914 is available in a space efficient 10-lead
exposed-DAP TSSOP package.
Key Specifications
j BTL output power (R_L = 8Ω)
V_DD = at 3.0V, THD = 0.1%
V_DD = at 5.0V, THD = 0.1%
j SE output power (R_L = 32Ω)
V_DD = at 3.0V, THD = 0.1%
V_DD = at 5.0V, THD = 0.1%
330mW (typ)
1W (typ)
30mW (typ)
85mW (typ)
j Micro-power shutdown supply current
j PSRR (f = 1kHz)
V_DD = at 3.0V, BTL Mode
V_DD = at 5.0V, BTL Mode
0.03µA (typ)
52dB (typ)
52dB (typ)
Features
n Advanced "click and pop" suppression circuitry
n Stereo headphone amplifier mode
n Low current micro-power shutdown mode
n Thermal shutdown protection circuitry
n 2.5V to 5.5V operation
n Unity-gain stable
n Gain set with external resistors
n Space-saving exposed-DAP TSSOP package
Applications
n PDAs
n Cellular phones
n Handheld portable electronic devices
Connection Diagram
Top View
Order Number LM4914MH
See NS package Number MXF10A
200634A0
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