LM4890MBD National Semiconductor, LM4890MBD Datasheet

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LM4890MBD

Manufacturer Part Number
LM4890MBD
Description
BOARD EVALUATION LM4890M
Manufacturer
National Semiconductor
Series
Boomer®r
Datasheet
1.LM4890MXNOPB.pdf (30 pages)

Specifications of LM4890MBD

Amplifier Type
Class AB
Output Type
1-Channel (Mono)
Max Output Power X Channels @ Load
1W x 1 @ 8 Ohm
Voltage - Supply
2.2 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Board Type
Fully Populated
Utilized Ic / Part
LM4890
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
© 2006 National Semiconductor Corporation
LM4890
1 Watt Audio Power Amplifier
General Description
The LM4890 is an audio power amplifier primarily designed
for demanding applications in mobile phones and other por-
table communication device applications. It is capable of
delivering 1 watt of continuous average power to an 8Ω BTL
load with less than 1% distortion (THD+N) from a 5V
power supply.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. The LM4890 does not require output
coupling capacitors or bootstrap capacitors, and therefore is
ideally suited for mobile phone and other low voltage appli-
cations where minimal power consumption is a primary re-
quirement.
The LM4890 features a low-power consumption shutdown
mode, which is achieved by driving the shutdown pin with
logic low. Additionally, the LM4890 features an internal ther-
mal shutdown protection mechanism.
The LM4890 contains advanced pop & click circuitry which
eliminates noises which would otherwise occur during
turn-on and turn-off transitions.
The LM4890 is unity-gain stable and can be configured by
external gain-setting resistors.
Connection Diagrams
Boomer
®
is a registered trademark of National Semiconductor Corporation.
Order Number LM4890IBP, LM4890IBPX
See NS Package Number BPA08DDB
8 Bump micro SMD
Top View
DS200192
20019223
DC
Key Specifications
Features
n Available in space-saving packages: micro SMD, MSOP,
n Ultra low current shutdown mode
n BTL output can drive capacitive loads
n Improved pop & click circuitry eliminates noises during
n 2.2 - 5.5V operation
n No output coupling capacitors, snubber networks or
n Thermal shutdown protection
n Unity-gain stable
n External gain configuration capability
Applications
n Mobile Phones
n PDAs
n Portable electronic devices
j
j
j
j
SOIC, and LLP
turn-on and turn-off transitions
bootstrap capacitors required
PSRR at 217Hz, V
Power Output at 5.0V & 1% THD
Power Output at 3.3V & 1% THD
Shutdown Current
8 bump micro SMD Marking
T - Die Traceability
G - Boomer Family
E - LM4890IBP
X - Date Code
DD
Top View
= 5V (Fig. 1)
20019270
400mW(typ.)
www.national.com
0.1µA(typ.)
62dB(typ.)
July 2006
1W(typ.)

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LM4890MBD Summary of contents

Page 1

... Connection Diagrams 8 Bump micro SMD Top View Order Number LM4890IBP, LM4890IBPX See NS Package Number BPA08DDB Boomer ® registered trademark of National Semiconductor Corporation. © 2006 National Semiconductor Corporation Key Specifications j PSRR at 217Hz Power Output at 5.0V & 1% THD j Power Output at 3.3V & 1% THD ...

Page 2

Connection Diagrams 9 Bump micro SMD Top View Order Number LM4890IBL, LM4890IBLX See NS Package Number BLA09AAB LLP Package Top View Order Number LM4890LD See NS Package Number LDA10B Mini Small Outline (MSOP) Package Top View Order Number LM4890MM See ...

Page 3

Connection Diagrams 9 Bump micro SMD Top View Order Number LM4890ITL, LM4890ITLX See NS Package Number TLA09AAA Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit (Continued) 200192C1 3 9 Bump micro SMD Marking 200192D0 Top View X - Date ...

Page 4

... 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 11) Storage Temperature Input Voltage Power Dissipation (Note 3) ESD Susceptibility (Note 4) Junction Temperature Thermal Resistance θ (SOP) JC θ (SOP) JA θ ...

Page 5

Electrical Characteristics V The following specifications apply for the circuit shown in Figure 1 unless otherwise specified. Limits apply for T 25˚C. (Continued) Symbol Parameter P Output Power (8Ω Thermal Shutdown Temperature SD THD+N Total Harmonic Distortion + ...

Page 6

External Components Description Components 1. R Inverting input resistance which sets the closed-loop gain in conjunction with R IN high pass filter with Input coupling capacitor which blocks the DC voltage at the amplifier’s input terminals. Also ...

Page 7

Typical Performance Characteristics THD+N vs Frequency 5V, 8Ω and PWR = 250mW THD+N vs Frequency @ V = 2.6V 8Ω, PWR = 100mW ...

Page 8

Typical Performance Characteristics THD+N vs Power Out @ 8Ω, 1kHz THD+N vs Power Out @ V = 2.6V 8Ω, 1kHz www.national.com (Continued ...

Page 9

Typical Performance Characteristics Power Supply Rejection Ratio (PSRR 5V 200mvp-p DD ripple R = 8Ω 10Ω Power Supply Rejection Ratio (PSRR 5V 200mvp-p DD ripple R = 8Ω, ...

Page 10

Typical Performance Characteristics Power Supply Rejection Ratio (PSRR 3V 200mvp-p, DD ripple R = 8Ω 10Ω Power Supply Rejection Ratio (PSRR 3V 200mvp-p, DD ripple R = 8Ω, ...

Page 11

Typical Performance Characteristics PSRR vs DC Output Voltage PSRR vs DC Output Voltage PSRR vs DC Output Voltage ...

Page 12

Typical Performance Characteristics PSRR Distribution V 217Hz, 200mvp-p, -30, +25, and +80˚C Power Supply Rejection Ration vs Bypass Capacitor Size V = 5V, Input Grounded = 10Ω, Output Load = 8Ω DD Top Trace = No Cap, Next Trace Down ...

Page 13

Typical Performance Characteristics Power Derating Curves (P DMAX Ambient Temperature in Degrees C Note 670mW for 5V, 8Ω) DMAX Power Derating - 9 bump µSMD (P Ambient Temperature in Degrees C Note 670mW for 5V, 8Ω) ...

Page 14

Typical Performance Characteristics Power Dissipation vs Output Power = 5V, 1kHz, 8Ω, THD ≤ 1. Power Dissipation vs Output Power V = 2.6V, 1kHz DD Supply Current vs Ambient Temperature www.national.com (Continued) Power Dissipation vs Output Power = ...

Page 15

Typical Performance Characteristics Max Die Temp bump microSMD) DMAX Output Offset Voltage Shutdown Hysterisis Voltage (Continued 20019286 200192B7 Shutdown Hysterisis Voltage 20019279 15 Max Die Temp (8 bump microSMD) DMAX 20019287 ...

Page 16

Typical Performance Characteristics Open Loop Frequency Response V = 5V, No Load DD Gain / Phase Response 5V, 8Ω Load LOAD Phase Margin vs C LOAD V = 5V, 8Ω Load DD Capacitance to gnd ...

Page 17

Typical Performance Characteristics Frequency Response vs Input Capacitor Size (Continued) Phase Margin and Limits vs Application Variables 22KΩ IN Wake Up Time ( 200192B6 20019254 17 20019298 Noise Floor 20019256 www.national.com ...

Page 18

... Ensure efficient thermal conductivity by plating through and solder- filling the vias. Further detailed information concerning PCB layout, fabrication, and mounting an LLP package is avail- able from National Semiconductor’s Package Engineering Group under application note AN1187. www.national.com POWER DISSIPATION ...

Page 19

Application Information SHUTDOWN OUTPUT IMPEDANCE For R = 20k ohms (between Out1 and GND) = 10k||50k||R OUT1 Z (between Out2 and GND) = 10k||(40k+(10k||R OUT2 8.3kΩ Z (between Out1 and Out2) = 40k||(10k+(10k||R OUT1-2 11.7kΩ The -3dB roll ...

Page 20

Application Information As stated in the External Components section, R junction with C create a highpass filter. IN ≥ 1/(2π*20 kΩ*20Hz) = 0.397µF; use 0.39µ The high frequency pole is determined by the product of the desired frequency ...

Page 21

Application Information FIGURE 3. DIFFERENTIAL AMPLIFIER CONFIGURATION FOR LM4890 FIGURE 4. REFERENCE DESIGN BOARD and LAYOUT - micro SMD (Continued) 21 20019229 20019225 www.national.com ...

Page 22

Application Information LM4890 micro SMD BOARD ARTWORK Silk Screen Bottom Layer Inner Layer Ground www.national.com (Continued) 20019257 20019259 20019261 22 Top Layer 20019258 Inner Layer V DD 20019260 ...

Page 23

Application Information FIGURE 5. REFERENCE DESIGN BOARD and PCB LAYOUT GUIDELINES - MSOP & SO Boards (Continued) 23 20019268 www.national.com ...

Page 24

Application Information LM4890 SO DEMO BOARD ARTWORK Silk Screen Top Layer Bottom Layer www.national.com (Continued) LM4890 MSOP DEMO BOARD ARTWORK 20019262 20019263 20019264 24 Silk Screen 20019265 Top Layer 20019266 Bottom Layer 20019267 ...

Page 25

Application Information Item Part Number 1 551011208-001 LM4890 Mono Reference Design Board 10 482911183-001 LM4890 Audio AMP 20 151911207-001 Tant Cap 1uF 16V 10 21 151911207-002 Cer Cap 0.39uF 50V Z5U 20% 1210 25 152911207-001 Tant Cap 1uF 16V 10 ...

Page 26

Physical Dimensions Note: Unless otherwise specified. 1. Epoxy coating. 2. 63Sn/37Pb eutectic bump. 3. Recommend non-solder mask defined landing pad. 4. Pin 1 is established by lower left corner with respect to text orientation pins are numbered counterclockwise. 5. Reference ...

Page 27

Physical Dimensions inches (millimeters) unless otherwise noted (Continued 1.514 9-Bump micro SMD Order Number LM4890IBL, LM4890IBLX NS Package Number BLA09AAB ± ± 0. 1.514 0. 0.945 MSOP Order Number LM4890MM NS Package Number MUA08A ...

Page 28

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted (Continued) SO Order Number LM4890M NS Package Number M08A 28 ...

Page 29

Physical Dimensions inches (millimeters) unless otherwise noted (Continued 1.514 LLP Order Number LM4890LD NS Package Number LDA10B 9-Bump micro SMD Order Number LM4890ITL, LM4890ITLX NS Package Number TLA09AAA ± ± 0. 1.514 0. 0.600 ...

Page 30

... BANNED SUBSTANCE COMPLIANCE National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C2) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/quality/green. ...

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