IC AMP AUDIO PWR MONO AB 12USMD

LM48556TL/NOPB

Manufacturer Part NumberLM48556TL/NOPB
DescriptionIC AMP AUDIO PWR MONO AB 12USMD
ManufacturerNational Semiconductor
SeriesBoomer®
TypeClass AB
LM48556TL/NOPB datasheet
 


Specifications of LM48556TL/NOPB

Output Type1-Channel (Mono)Voltage - Supply2.7 V ~ 4.5 V
FeaturesDepop, Differential Inputs, ShutdownMounting TypeSurface Mount
Package / Case12-MicroSMDLead Free Status / RoHS StatusLead free / RoHS Compliant
Max Output Power X Channels @ Load-Other namesLM48556TLTR
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LM48556
Fully Differential, Mono, Ceramic Speaker Driver
General Description
The LM48556 is a single supply, mono, ceramic speaker driv-
er with an integrated charge-pump, designed for portable
devices, such as cell phones, where board space is at a pre-
mium. The LM48556 charge pump allows the device to deliver
17.5V
(typ) from a single 4.5V supply. Additionally, the
PP
charge pump features a soft start function that minimizes
transient current during power-up.
The LM48556 features high power supply rejection ratio
(PSRR) of 80dB at 217Hz, allowing the device to operate in
noisy environments without additional power supply condi-
tioning. Flexible power supply requirements allow operation
from 2.7V to 5.0V. Additionally, the LM48556 features a dif-
ferential input function and an externally configurable gain. A
low power shutdown mode reduces supply current consump-
tion to 0.1μA.
Superior click and pop suppression eliminates audible tran-
sients on power-up/down and during shutdown. The
LM48556 is available in an ultra-small 12-bump micro SMD
package (2mm x 1.5mm).
Boomer
®
is a registered trademark of National Semiconductor Corporation.
© 2008 National Semiconductor Corporation
Key Specifications
■ 
Output Voltage Swing
V
= 3.6V, 1kHz
DD
V
= 4.5V, 1kHz
DD
■ 
Power Supply Rejection Ratio
f = 217Hz, V
■ 
I
at V
DD
DD
■ 
Wake-Up Time
Features
Fully differential amplifier
Externally configurable gain
Integrated charge pump
Low power shutdown mode
Soft start function
Applications
Mobile phones
PDA's
Digital cameras
300572
December 10, 2008
14.2V
17.5V
= 3.6V
80dB (typ)
DD
= 3.6V
4.8mA (typ)
0.5ms (typ)
www.national.com
(typ)
PP
(typ)
PP

LM48556TL/NOPB Summary of contents

  • Page 1

    ... Superior click and pop suppression eliminates audible tran- sients on power-up/down and during shutdown. The LM48556 is available in an ultra-small 12-bump micro SMD package (2mm x 1.5mm). Boomer ® registered trademark of National Semiconductor Corporation. © 2008 National Semiconductor Corporation Key Specifications ■  Output Voltage Swing ...

  • Page 2

    Typical Application www.national.com FIGURE 1. Typical Audio Amplifier Application Circuit 2 300572d4 ...

  • Page 3

    Connection Diagrams 12 Bump micro SMD Top View Order Number LM48556TL, LM48556TLX See NS Package Number TLA121AA 12 Bump micro SMD Package View 3 300572d6 30057231 www.national.com ...

  • Page 4

    Bump Descriptions Bump Ordering Information Order Number Package 12 bump micro LM48556TL SMD 12 bump micro LM48556TLX SMD www.national.com LM48556TL Marking Top View XY = Date Code TT ...

  • Page 5

    ... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage ( (Note 1) Storage Temperature Input Voltage Power Dissipation (Note 3) ESD Rating(Note 4) ESD Rating (Note 5) Electrical Characteristics V The following specifications apply for V specified. Limits apply for T = 25° ...

  • Page 6

    Symbol Parameter PSRR Power Supply Rejection Ratio CMRR Common Mode Rejection Ratio V Logic High Threshold Voltage LH V Logic Low Threshold Voltage LL Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur, including ...

  • Page 7

    Typical Performance Characteristics = 15Ω+1μ 20dB 22kHz THD+N vs Frequency V = 2.7V THD+N vs Frequency V = 4.5V 17. THD+N vs Output ...

  • Page 8

    CMRR vs Frequency V = 2.7V, Input referred DD CMRR vs Frequency V = 4.5V, Input referred DD PSRR vs Frequency V = 3.6V, Input referred DD www.national.com CMRR vs Frequency V = 3.6V, Input referred DD 300572d0 PSRR vs ...

  • Page 9

    Output Voltage vs Frequency V = 2.7V, THD Output Voltage vs Frequency V = 4.5V, THD Power Consumption vs Output Voltage Swing ≤ 2.7V, THD Output Voltage vs Frequency V ...

  • Page 10

    Power Consumption vs Output Voltage Swing ≤ 4.5V, THD 300572e6 ...

  • Page 11

    Application Information GENERAL AMPLIFIER FUNCTION The LM48556 is a fully differential ceramic speaker driver that utilizes National’s inverting charge pump technology to deliv- er the high drive voltages required by ceramic speakers, without the need for noisy, board-space consuming inductive ...

  • Page 12

    R C (Hz Where the value determined by equation (1) in the IN Gain Setting Resistor Selection section. When the LM48556 is using a single-ended source, power supply noise ...

  • Page 13

    Bill Of Materials Component Description LM48556TL LM48556TL 4.7μF, ceramic, low ESR (<0.1Ω) 16V, Capacitor -40°C to +85°C 82μF, 16V, -40°C to +85°C Capacitor 82μF, 16V, -40°C to +85°C Capacitor 0.47μF, 16V, -40°C to +85° Capacitor 0.47μF, 16V, -40°C to +85°C ...

  • Page 14

    Demonstration Board Schematic www.national.com FIGURE 3: Demo Board Schematic 14 300572b0 ...

  • Page 15

    Demonstration Board PCB Views FIGURE 4: Top Overlay FIGURE 5: Top Layer 15 300572b6 300572b5 www.national.com ...

  • Page 16

    FIGURE 6: Mid Layer 1 FIGURE 7: Mid Layer 2 16 300572b3 300572b4 ...

  • Page 17

    FIGURE 8: Bottom Overlay FIGURE 9: Bottom Layer 17 300572b2 300572b1 www.national.com ...

  • Page 18

    Revision History Rev Date 1.0 06/03/08 1.01 12/09/08 www.national.com Description Initial release. Changed Power Supply Voltage Limits from 4.5V to 5.0V. 18 ...

  • Page 19

    Physical Dimensions inches (millimeters) unless otherwise noted 12 Bump micro SMD Order Number LM48556TL, LM48556TLX NS Package Number TLA121AA = 1488μ 1996μm, = 600μ www.national.com ...

  • Page 20

    ... For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www ...