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LM48555TL Datasheet

  • LM48555TL

  • National Semiconductor [Ceramic Speaker Driver]

  • 332.89KB

  • NSC

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LM48555 Ceramic Speaker Driver
March 2007
LM48555
Ceramic Speaker Driver
General Description
The LM48555 is an audio power amplifier designed to drive
ceramic speakers in applications such as cell phones, smart
phones, PDAs and other portable devices. The LM48555 pro-
duces 15.7V
P-P
with less than 1% THD+N while operating
from a 3.2V power supply. The LM48555 features a low power
shutdown mode, and differential inputs for improved noise
rejection.
The LM48555 includes advanced click and pop suppression
that eliminates audible turn-on and turn-off transients. Addi-
tionally, the integrated boost regulator features a soft start
function that minimizes transient current during power-up
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal number of
external components. The LM48555 does not require boot-
strap capacitors, or snubber circuits.
The LM48555 is unity-gain stable and uses external gain-set-
ting resistors.
Key Specifications
鈻犫€?/div>
I
DDQ
(Boost Converter + Amplifier)
at V
DD
= 5V
7.5mA (typ)
鈻犫€?/div>
Output Voltage Swing
V
DD
= 3.2V, THD
鈮?/div>
1%
15.7V
P-P
(typ)
80dB (typ)
鈻犫€?/div>
Power Supply Rejection Ratio
f = 217Hz
Features
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
Fully differential amplifier
Externally configurable gain
Soft start function
Low power shutdown mode
Under voltage lockout
Applications
鈻?/div>
Mobile phones
鈻?/div>
PDA's
鈻?/div>
Digital cameras
Typical Application
300099c9
*
CF+ and CF- are optional. Refer to 鈥淪electing Input and Feedback Capacitor and Resistor for Audio Amplifier鈥?section.
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer
廬
is a registered trademark of National Semiconductor Corporation.
漏 2007 National Semiconductor Corporation
300099
www.national.com

LM48555TL 產(chǎn)品屬性

  • AB

  • 1

  • 2.7V 到 6.5V

  • 0.05% @ VDD=3.2V

  • -40°C 到 +85°C

  • Micro SMD

  • 12

  • No SVHC (19-Dec-2011)

  • -000mW

  • 48555

  • Bump Micro SMD

  • -40°C

  • 85°C

  • 1

  • 6.5V

  • 2.7V

  • 表面安裝

  • 6.5V

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