LM48555 - Ceramic Speaker Driver

Datasheet Packaging Samples & Pricing Eval. Boards Knowledge Base

Features
• Fully differential amplifier
• Externally configurable gain
• Soft start function
• Low power shutdown mode
• Under voltage lockout

Key Specification

■  IDDQ (Boost Converter + Amplifier)   at VDD = 5V 7.5mA (typ)
■  Output Voltage Swing  
  VDD = 3.2V, THD ≤ 1% 15.7VP-P (typ)
■  Power Supply Rejection Ratio   f = 217Hz 80dB (typ)

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. More...


Applications

• Mobile phones
• PDA's
• Digital cameras
  Typical Application
*click for larger image


Parametric Table     expand
Parametric Table    collapse
Voltage@ Vcc=5V, 1%THD 15.7 Volt
Voltage@ Vcc=5V, 10% THD 16.0 Volt
Load Conditions 1uF+20 ohm
Supply Min 2.7 Volt
Supply Max 6.5 Volt
THD 1 %
THD Conditions Rl=1uf+20ohm, f=1kHz
THD Conditions Rl=1uf+20ohm, f=1kHz
Shutdown Type Low
Voltage@ Vcc=5V, 1%THD 15.7 Volt
Voltage@ Vcc=5V, 10% THD 16.0 Volt
Load Conditions 1uF+20 ohm
Supply Min 2.7 Volt
Supply Max 6.5 Volt
THD 1 %
THD Conditions Rl=1uf+20ohm, f=1kHz
Shutdown Type Low
View Using Catalog


Typical Performance

click for larger image


  Block Diagram
*click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM48555 Ceramic Speaker Driver 332 Kbytes 15-Mar-07 Download

If you have trouble printing or viewing PDF file(s), see Printing Problems.


Package Availability, Models, Samples & Pricing
Part NumberPackageFactory Lead TimeModelsSamples &
Electronic
Orders		Budgetary PricingStd
Pack
Size		Package
Marking
Format
TypePinsSpec.MSL
Rating		Peak
Reflow		RoHS
Report		CAD
Symbols		WeeksQtyQty$US each
LM48555TLBDLM48555TLBD Evaluation BoardFull productionN/A
 
Buy Now 		1+$150.001-
N/AN/A
LM48555TLMICRO SMD12NOPB1260RoHS N/A Full productionN/A
Samples
Buy Now 		1K+$1.95reel
of
250		XVG
I I4
6 weeks50
LM48555TLXMICRO SMD12NOPB1260RoHS N/A Full productionN/A
 
Buy Now 		1K+$1.95reel
of
3000		XVG
I I4
6 weeksN/A

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 produces 15.7VP-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. Additionally, 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 bootstrap capacitors, or snubber circuits.

The LM48555 is unity-gain stable and uses external gain-setting resistors.

Application Notes

TitleSize in Kbytes Date Click link below to Download
AN-1611: Application Note 1611 LM48555 Evaluation Board 734 Kbytes 4-Apr-07 Download

If you have trouble printing or viewing PDF file(s), see Printing Problems.

[Information as of 3-Jul-2009]