LM4854IBL/NOPB National Semiconductor, LM4854IBL/NOPB Datasheet

IC AMP AUDIO PWR 2.3W AB 12USMD

LM4854IBL/NOPB

Manufacturer Part Number
LM4854IBL/NOPB
Description
IC AMP AUDIO PWR 2.3W AB 12USMD
Manufacturer
National Semiconductor
Series
Boomer®r
Type
Class ABr
Datasheet

Specifications of LM4854IBL/NOPB

Output Type
1-Channel (Mono) with Stereo Headphones
Max Output Power X Channels @ Load
2.3W x 1 @ 3.2 Ohm; 200mW x 2 @ 16 Ohm
Voltage - Supply
2.4 V ~ 5.5 V
Features
Depop, Shutdown, Standby, Thermal Protection
Mounting Type
Surface Mount
Package / Case
12-MicroSMD
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
LM4854IBL
LM4854IBLTR
© 2003 National Semiconductor Corporation
LM4854
1.9W Monaural, 85mW Stereo Headphone Audio
Amplifier
General Description
The unity-gain stable LM4854 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
1.1W (typ) to an 8Ω load, 1.7W (typ) to a 4Ω load (Note 1) at
1% THD+N. In SE stereo mode, the amplifier will deliver
85mW to 32Ω loads. The LM4854 features a new circuit
topology that suppresses output transients (’click and pops’)
and eliminates SE-mode output coupling capacitors, saving
both component and board space costs. The LM4854 has
three inputs: one pair for a two-channel stereo signal and the
third for a single-channel mono input.
The LM4854 is designed for PDA, cellular telephone, note-
book, and other handheld portable applications. It delivers
high quality output power from a surface-mount package and
requires few external components. Other features include an
active-low micropower shutdown mode, an "instant-on" low
power standby mode, and thermal shutdown protection.
The LM4854 is available in the very space-efficient 12-lead
micro SMD, exposed-DAP LLP for higher power applica-
tions, and TSSOP packages.
Note 1: An LM4854LD that has been properly mounted to a circuit board will
deliver 1.7W (typ) into a 4Ω load.
Key Specifications
j
THD+N = 1%)
j
THD+N = 1%)
j
THD+N = 1%)
Boomer
V
V
V
V
V
V
LLP BTL output power (R
LLP BTL output power (R
LLP BTL output power (R
DD
DD
DD
DD
DD
DD
®
is a registered trademark of National Semiconductor Corporation.
= 3.0V
= 5.0V
= 3.0V
= 5.0V
= 3.0V
= 5.0V
L
L
L
= 3.2Ω and
= 4Ω and
= 8Ω and
DS200382
900mW (typ)
380mW (typ)
1.0W (typ)
1.9W (typ)
1.7W (typ)
1.1W (typ)
Features
n Fast 0.1ms (typ) and 1.0ms (max) turn-on and turn-off
n Eliminates SE amplifier output coupling capacitors
n Advanced "click and pop" suppression circuitry
n Stereo headphone amplifier mode
n Low-power standby and ultra-low current micropower
n Thermal shutdown protection circuitry
n 2.4V to 5.5V operation
n Unity-gain stable
n Gain set with external resistors
n Space-saving micro SMD package, exposed-DAP LLP,
Applications
n PDAs
n Notebook computers
n Cellular phones
n Handheld portable electronic devices
j
= 1.0%)
j
j
j
(Fig. 1))
time
shutdown modes
and TSSOP
V
V
V
V
V
V
BTL
SE
SE output power (R
Micropower shutdown supply current
Standby supply current
PSRR (f = 1kHz, 3.0V ≤ V
DD
DD
DD
DD
DD
DD
= 3.0V
= 5.0V
= 3.0V
= 5.0V
= 3.0V
= 5.0V
L
= 32Ω and THD+N
DD
≤ 5.0V,
0.005µA (typ)
www.national.com
0.05µA (typ)
32mW (typ)
93mW (typ)
16µA (typ)
27µA (typ)
60dB (typ)
66dB (typ)
April 2003

Related parts for LM4854IBL/NOPB

LM4854IBL/NOPB Summary of contents

Page 1

... L THD LLP BTL output power (R = 8Ω and L THD 5.0V DD Boomer ® registered trademark of National Semiconductor Corporation. © 2003 National Semiconductor Corporation j SE output power (R = 1 Micropower shutdown supply current Standby supply current V = 3.0V ...

Page 2

Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit (Pin out shown for the 12-pin large bump micro SMD IBL package. Consult the "Connection Diagrams" for the LLP or MT package pin out.) www.national.com 2 20038201 ...

Page 3

Connection Diagrams LM4854IBL Pin Designation 20038202 Top View (Bump-side down) Order Number LM4854IBL See NS Package Number BLA12BAB Micro SMD Marking 20038203 Top View X - Date Code T - Die Traceability G - Boomer Family 54 - LM4854IBL Pin ...

Page 4

Connection Diagrams Top View Order Number LM4854LD See NS Package Number LDA14A Top View Order Number LM4854MT See NS Package Number MTC14 www.national.com 20038204 Bottom Line - Part Number 20038205 Bottom 2 lines - Part Number 4 200382A5 Top View ...

Page 5

... Absolute Maximum Ratings 3) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Storage Temperature Input Voltage Power Dissipation(Note 4) ESD Susceptibility (Note 5) All pins except Pin C3 (IBL), Pin11 (LD/MT) Pin C3 (IBL), Pin 11 (LD/MT) ...

Page 6

Electrical Characteristics Bridged-Mode Operation (V The following specifications apply for for the circuit shown in Figure 1 and a measurement bandwith of 20Hz to 80kHz, unless otherwise specified. Limits apply for T Symbol Parameter P Output Power (Note 11) O ...

Page 7

Electrical Characteristics for Entire Amplifier (V The following specifications apply for circuit shown in Figure 1, unless otherwise specified. Limits apply for T Symbol Parameter PSRR Power Supply Rejection Ratio t Return-from-Shutdown Time RSH t Return-from-Standby Time RST V Shutdown ...

Page 8

Electrical Characteristics : SE Operation (V The following specifications apply for for the circuit shown in Figure 1 and a measurement bandwith of 20Hz to 80kHz, unless otherwise specified. Limits apply for T Symbol Parameter P Output Power (Note 11) ...

Page 9

External Components Description See Figure 1. Components 1. R This is the inverting input resistance that, along with R i input capacitance This is the input coupling capacitor. It blocks DC voltage at the amplifier’s inverting input. ...

Page 10

Typical Performance Characteristics THD+N vs Frequency 32Ω (SE 50mW OUT THD+N vs Frequency 8Ω (BTL 150mW OUT www.national.com (Continued) THD+N vs Frequency ...

Page 11

Typical Performance Characteristics THD+N vs Frequency 32Ω (SE 30mW OUT THD+N vs Output Power 8Ω (BTL (from top to bottom at 0.2W) 20kHz, ...

Page 12

Typical Performance Characteristics THD+N vs Output Power 32Ω (SE (from top to bottom at 20mW) 20kHz, 20Hz, 1kHz THD+N vs Output Power 8Ω (BTL ...

Page 13

Typical Performance Characteristics THD+N vs Output Power 32Ω (SE (from top to bottom at 20mW) 20kHz, 20Hz, 1kHz Output Power vs Power Supply Voltage R = 16Ω (BTL 1kHz, L ...

Page 14

Typical Performance Characteristics PSRR vs Frequency 8Ω (BTL 10Ω SOURCE PSRR vs Frequency 32Ω (SE 10Ω SOURCE www.national.com (Continued) PSRR vs Frequency ...

Page 15

Typical Performance Characteristics PSRR vs Frequency 8Ω (BTL 10Ω SOURCE PSRR vs Frequency 32Ω (SE 10Ω SOURCE (Continued) PSRR vs Frequency 200382B1 ...

Page 16

Typical Performance Characteristics Amplifier Power Dissipation vs Load Power Dissipation LM4854IBL/MT (from top to bottom at 0.04W 16Ω (SE 32Ω (SE both channels driven and loaded Power Dissipation Derating Curves LM4854LD, ...

Page 17

Typical Performance Characteristics Power Dissipation Derating Curve LM4854MT 5V 8Ω (BTL 1kHz L IN Output Power vs Load Resistance LM4854IBL/MT, BTL Load, (from top to bottom at 12Ω): V = 5V, THD+N = ...

Page 18

Typical Performance Characteristics Channel-to-Channel Crosstalk vs Frequency 16Ω (SE Left channel driven, right channel measured B = Right channel driven, left channel measured Channel-to-Channel Crosstalk vs Frequency V = 3V, R ...

Page 19

Application Information the amplifier that drives the headphone jack’s sleeve. If this current exceeds 500mA , the amplifier is shutdown, pro- PK FIGURE 2. Typical Audio Amplifier Application Circuit EXPOSED-DAP MOUNTING CONSIDERATIONS The LM4854’s exposed-DAP (die attach paddle) package (LD) ...

Page 20

Application Information PCB LAYOUT AND SUPPLY REGULATION CONSIDERATIONS FOR DRIVING 3Ω AND 4Ω LOADS Power dissipated by a load is a function of the voltage swing across the load and the load’s impedance. As load imped- ance decreases, load dissipation ...

Page 21

Application Information power, higher ambient temperatures are allowed as output power or duty cycle decreases. If the result of Equation (3) is greater than that of Equation (4), then decrease the supply voltage, increase the load impedance, or reduce the ...

Page 22

Application Information FIGURE 3. Headphone Circuit Figure 4 shows an optional resistor connected between the amplifier output that drives the headphone jack sleeve and ground. This resistor provides a ground path that supressed power supply hum. This hum may occur ...

Page 23

Application Information OPTIMIZING CLICK AND POP REDUCTION PERFOR- MANCE The LM4854 contains circuitry that eliminates turn-on and shutdown transients ("clicks and pops") and transients that could occur when switching between BTL speakers and single-ended headphones. For this discussion, turn-on re- ...

Page 24

Application Information The product of the desired high frequency cutoff (100kHz in this example) and the differential gain AVD, determines the upper passband response limit. With AVD = 3 and fH = 100kHz, the closed-loop gain bandwidth product (GBWP) is ...

Page 25

Demonstration Board Layout (Continued) FIGURE 9. Recommended MM PC Board Layout: Bottom_Side Layout FIGURE 10. Recommended MT PC Board Layout: Component-Side SilkScreen FIGURE 11. Recommended MT PC Board Layout: Component-Side Layout FIGURE 12. Recommended MT PC Board Layout: Bottom-Side Layout ...

Page 26

Demonstration Board Layout www.national.com (Continued) FIGURE 15. Recommended LD PC Board Layout: Upper Inner-Layer Layout FIGURE 16. Recommended LD PC Board Layout: Lower Inner-Layer Layout FIGURE 17. Recommended LD PC Board Layout: Bottom-Side Layout 26 20038231 20038232 20038233 ...

Page 27

Physical Dimensions inches (millimeters) unless otherwise noted TSSOP Package Order Number LM4854MT NS Package Number MTC14 27 www.national.com ...

Page 28

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted (Continued) 14-Lead LLP Package Order Number LM4854LD NS Package Number LDA14A 28 ...

Page 29

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

Related keywords