LM48555

Manufacturer Part NumberLM48555
ManufacturerTexas Instruments
LM48555 datasheet
 


Specifications of LM48555

Supply Min(min)(volt)2.7Supply Max(max)(volt)6.5
Voltage Output Pk To Pk(v)15Pin/package12DSBGA
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LM48555
LM48555
Ceramic Speaker Driver
Literature Number: SNAS400

LM48555 Summary of contents

  • Page 1

    ... LM48555 LM48555 Ceramic Speaker Driver Literature Number: SNAS400 ...

  • Page 2

    ... PDAs and other portable devices. The LM48555 pro- duces 15.7V with less than 1% THD+N while operating P-P 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 ...

  • Page 3

    ... Connection Diagrams LM48555TL Bumps Down View Top View Order Number LM48555TL See NS Package Number TLA12Z1A www.national.com LM48555TL Marking Drawing X = One digit date code 300099c8 TLA12 Package View (Bumps Up) 2 30009956 Top View V = Die traceability G = Boomer Family I4 = LM48555TL 30009931 ...

  • Page 4

    ... AMP THD = 1% (max 1kHz V = 14V , f = 1kHz OUT P-P A-Weighted Filter 200mV , f = 217Hz, RIPPLE p 20dB V Input referred 3 ≤ ≤ (Note 10) −40° MAX ≤ LM48555 Typical Limit (Note 6) (Notes 0.1 1 1.2 0 100 8.5 8 7.5 15.7 15 0.05 0 0.5 4 2.5 2.6 0.3 www.national.com 150° ...

  • Page 5

    ... Note 9: Shutdown current is measured in a normal room environment. The SD pin should be driven as close as possible to GND for minimum shutdown current. Note 10: The value for θ is measured with the LM48555 mounted on a 3” x 1.5” (76.2mm x 3.81mm) four layer board. The copper thickness for all four layers ...

  • Page 6

    Typical Performance Characteristics THD+N vs Frequency V = 4.95V , V = 3.2V, O RMS DD = 1μF + 20Ω THD+N vs Frequency V = 4.95V , V O RMS DD = 1μF + 20Ω THD+N ...

  • Page 7

    CMRR vs Frequency = 1μF + 20Ω 3.2V 100mV IN CMRR vs Frequency = 1μF + 20Ω 5V 100mV IN PSRR vs Frequency = 1μF + ...

  • Page 8

    Inductor Current vs Output Voltage Swing = 1μF + 20Ω 1kHz 3V, 4.2V Supply Current vs Supply Voltage 30009960 7 30009967 www.national.com ...

  • Page 9

    ... The LM48555 can be used, how- ever single-ended input amplifier while still retaining its fully differential benefits. In fact, completely unrelated signals may be placed at the input pins. The LM48555 simply ampli- fies the difference between them. The LM48555 provides what is known as a "bridged mode" ...

  • Page 10

    ... Thus, by minimizing the capacitor value based on desired low frequency response, turn-on pops can be minimized. The LM48555 is unity-gain stable which gives the designer maximum system flexibility. However, to drive ceramic speak- ers, a typical application requires a closed-loop differential gain of 10V/V. In this case, feedback capacitors (CF+, CF-) may be needed as shown in Figure 1 to bandwidth limit the amplifier ...

  • Page 11

    ... Where “lp” is the peak inductor current. The LM48555 will limit its switch current based on peak current. With I creasing L will increase the maximum amount of power avail- able to the load. Conversely, using too little inductance may limit the amount of load current which can be drawn from the output ...

  • Page 12

    Revision History Rev Date 0.1 03/15/07 Description Initial Web Release 11 www.national.com ...

  • Page 13

    ... Physical Dimensions X1 = 1.463±0.03mm www.national.com inches (millimeters) unless otherwise noted Thin micro SMD Order Number LM48555TL NS Package Number TLA12Z1A     1.970±0.03mm X3 = 0.600±0.075mm 12 ...

  • Page 14

    Notes 13 www.national.com ...

  • Page 15

    THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION (“NATIONAL”) PRODUCTS. NATIONAL MAKES NO REPRESENTATIONS OR WARRANTIES WITH RESPECT TO THE ACCURACY OR COMPLETENESS OF THE CONTENTS OF THIS PUBLICATION AND RESERVES THE RIGHT TO MAKE ...

  • Page 16

    ... Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’ ...