TS4998IQT

Manufacturer Part NumberTS4998IQT
DescriptionIC AMP AUDIO PWR 1W STER 16QFN
ManufacturerSTMicroelectronics
TypeClass AB
TS4998IQT datasheet
 


Specifications of TS4998IQT

Output Type2-Channel (Stereo)Max Output Power X Channels @ Load1W x 2 @ 8 Ohm
Voltage - Supply2.7 V ~ 5.5 VFeaturesDepop, Differential Inputs, Standby, Thermal Protection
Mounting TypeSurface MountPackage / Case16-QFN
Operational ClassClass-ABAudio Amplifier Output Configuration2-Channel Stereo
Output Power (typ)1x2@8OhmWAudio Amplifier FunctionSpeaker
Total Harmonic Distortion0.5@8Ohm@700mW%Single Supply Voltage (typ)3/5V
Dual Supply Voltage (typ)Not RequiredVPower Supply RequirementSingle
Unity Gain Bandwidth Product (typ)1.5MHzRail/rail I/o TypeNo
Power Supply Rejection Ratio80dBSingle Supply Voltage (min)2.7V
Single Supply Voltage (max)5.5VDual Supply Voltage (min)Not RequiredV
Dual Supply Voltage (max)Not RequiredVOperating Temp Range-40C to 85C
Operating Temperature ClassificationIndustrialMountingSurface Mount
Pin Count16Package TypeQFN EP
For Use With497-8259 - BOARD EVAL BASED ON TS4998Lead Free Status / RoHS StatusLead free / RoHS Compliant
Other names497-6842-2  
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Features
Operating range from V
= 2.7V to 5.5V
CC
1W output power per channel @ V
THD+N=1%, R
=8Ω
L
Ultra low standby consumption: 10nA typ.
80dB PSRR @ 217Hz with grounded inputs
High SNR: 106dB(A) typ.
Fast startup time: 45ms typ.
Pop&click-free circuit
Dedicated standby pin per channel
Lead-free QFN16 4x4mm package
Applications
Cellular mobile phones
Notebook and PDA computers
LCD monitors and TVs
Portable audio devices
Description
The TS4998 is designed for top-class stereo
audio applications. Thanks to its compact and
power-dissipation efficient QFN16 package with
exposed pad, it suits a variety of applications.
With a BTL configuration, this audio power
amplifier is capable of delivering 1W per channel
of continuous RMS output power into an 8Ω load
@ 5V.
Each output channel (left and right), also has its
own external controlled standby mode pin to
reduce the supply current to less than 10nA per
channel. The device also features an internal
thermal shutdown protection.
The gain of each channel can be configured by
external gain setting resistors.
December 2007
2 x 1W differential input stereo audio amplifier
=5V,
CC
Rev 1
TS4998
QFN16 4x4mm
Pin connections (top view)
1/33
www.st.com
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TS4998IQT Summary of contents

  • Page 1

    Features ■ Operating range from V = 2.7V to 5.5V CC ■ 1W output power per channel @ V THD+N=1%, R =8Ω L ■ Ultra low standby consumption: 10nA typ. ■ 80dB PSRR @ 217Hz with grounded inputs ■ High ...

  • Page 2

    Contents Contents 1 Typical application schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 ...

  • Page 3

    TS4998 1 Typical application schematics Figure 1 shows a typical application for the TS4998 with a gain of +6dB set by the input resistors. Figure 1. Typical application schematics Optional Diff. input L- Cin1 P1 330nF Cin2 P2 Diff. input ...

  • Page 4

    Absolute maximum ratings 2 Absolute maximum ratings Table 2. Absolute maximum ratings Symbol V Supply voltage CC V Input voltage in T Operating free air temperature range oper T Storage temperature stg T Maximum junction temperature j R Thermal resistance ...

  • Page 5

    TS4998 3 Electrical characteristics Table +5V, GND = 0V Symbol Supply current input signal, no load, left and right channel active (1) Standby current I STBY No input signal, V STBYL Output ...

  • Page 6

    Electrical characteristics Table +3.3V, GND = 0V Symbol Supply current input signal, no load, left and right channel active (1) Standby current I STBY No input signal, V STBYL Output offset voltage ...

  • Page 7

    TS4998 Table +2.7V, GND = 0V Symbol Supply current input signal, no load, left and right channel active (1) Standby current I STBY No input signal, V STBYL Output offset voltage V ...

  • Page 8

    Electrical characteristics Table 7. Index of graphics THD+N vs. output power THD+N vs. frequency PSRR vs. frequency PSRR vs. common mode input voltage CMRR vs. frequency CMRR vs. common mode input voltage Crosstalk vs. frequency SNR vs. power supply voltage ...

  • Page 9

    TS4998 Figure 2. THD+N vs. output power 10 Ω +6dB F = 1kHz μ < 125kHz 1 ° Tamb = 25 C Vcc=2.7V 0.1 0.01 1E-3 0.01 Output power (W) ...

  • Page 10

    Electrical characteristics Figure 8. THD+N vs. output power 10 Ω +6dB F = 10kHz μ < 125kHz 1 ° Tamb = 25 C Vcc=2.7V 0.1 0.01 1E-3 0.01 Output power ...

  • Page 11

    TS4998 Figure 14. THD+N vs. frequency 10 Ω +6dB μ < 125kHz ° Tamb = 0.1 0.01 100 Frequency (Hz) Figure 16. THD+N vs. frequency 10 Ω ...

  • Page 12

    Electrical characteristics Figure 20. PSRR vs. frequency 0 Vcc = 5V -10 Vripple = 200mVpp G = +6dB -20 μ μ Cin = 4.7 F -30 Inputs Grounded ° Tamb = 25 C -40 -50 -60 ...

  • Page 13

    TS4998 Figure 26. PSRR vs. frequency 0 Vcc = 2.7V -10 Vripple = 200mVpp G = +6dB -20 μ μ Cin = 4.7 F -30 Inputs Grounded ° Tamb = 25 C -40 -50 -60 -70 ...

  • Page 14

    Electrical characteristics Figure 32. CMRR vs. frequency 0 Vcc = 3.3V ≥ Ω - +6dB Vic = 200mVpp -20 μ μ Cin = 4.7 F Tamb = 25°C -30 -40 -50 -60 ...

  • Page 15

    TS4998 Figure 38. Crosstalk vs. frequency 0 Ω - +6dB -20 μ μ Cin = -30 ° Tamb = 25 C -40 -50 Vcc=5V -60 Vcc=3.3V -70 Vcc=2.7V -80 ...

  • Page 16

    Electrical characteristics Figure 44. SNR vs. power supply voltage 110 108 106 104 102 100 98 Unweighted filter (20Hz to 20kHz 1kHz +6dB THD + N < 0.5% 92 Tamb = ...

  • Page 17

    TS4998 Figure 50. Current consumption vs. standby voltage Both channels active One channel active Standby Voltage (V) Figure 52. Current consumption vs. standby voltage ...

  • Page 18

    Electrical characteristics Figure 56. Frequency response 14 μ Ω Cin=4.7 F, Rin=12k Ω Cin=680nF, Rin=12k μ Ω Cin=4.7 F, Rin=24k Ω Cin=330nF, Rin=24k 100 1000 ...

  • Page 19

    TS4998 Figure 62. Power dissipation vs. output power Figure 63. Power derating curves 400 350 300 250 200 150 Ω RL=16 100 100 150 200 250 Output Power (mW) 3.0 2.8 2.6 Ω RL=4 2.4 2.2 ...

  • Page 20

    Application information 4 Application information 4.1 General description The TS4998 integrates two monolithic full-differential input/output power amplifiers with two selectable standby pins dedicated for each channel. The gain of each channel is set by external input resistors. 4.2 Differential configuration ...

  • Page 21

    TS4998 Due to the tolerance on the internal 50kΩ feedback resistors, the differential gain will be in the range (no tolerance on R The difference of resistance between input resistors of each channel have direct influence on the PSRR, CMRR ...

  • Page 22

    Application information 4.5 Low frequency response The input coupling capacitors block the DC part of the input signal at the amplifier inputs. In the low frequency region, C pass filter with a -3dB cut-off frequency. expressed in Ω and C ...

  • Page 23

    TS4998 4.6 Power dissipation and efficiency Assumptions: ● Load voltage and current are sinusoidal (V ● Supply voltage is a pure DC source (V The output voltage is: and and Therefore, the average current delivered by the supply voltage is: ...

  • Page 24

    Application information The efficiency is the ratio between the output power and the power supply: Equation 6 The maximum theoretical value is reached when V The TS4998 is stereo amplifier so it has two power amplifiers. Each amplifier produces heat ...

  • Page 25

    TS4998 4.7 Footprint recommendation Footprint soldering pad dimensions are given in previous section, the maximum allowable value for ambient temperature is dependent on the thermal resistance junction to ambient R power dissipation. Based on best thermal performance recommended ...

  • Page 26

    Application information 4.9 Standby control and wake-up time t The TS4998 has two dedicated standby pins (STBYL, STBYR). These pins allow to put each channel in standby mode or active mode independently. The amplifier is designed to reach close to ...

  • Page 27

    TS4998 external input capacitors C mismatched components, the TS4998 includes pop reduction circuitry. With this circuitry, the TS4998 is close to zero pop for all possible common applications. In addition, when the TS4998 is in standby mode, due to the ...

  • Page 28

    Application information 4.13 Notes on PSRR measurement What is the PSRR? The PSRR is the power supply rejection ratio. The PSRR of a device is the ratio between a power supply disturbance and the result on the output. In other ...

  • Page 29

    ... JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an STMicroelectronics trademark. ECOPACK specifications are available at: www.st.com. Figure 69. QFN16 package Figure 70 ...

  • Page 30

    QFN16 package information Figure 71. QFN16 4x4mm package mechanical data * The Exposed Pad is connected to Ground. * The Exposed Pad is connected to Ground. Figure 72. QFN16 footprint soldering pad 30/33 Dimensions Millimeters (mm) Ref Min A 0.8 ...

  • Page 31

    ... TS4998 6 Ordering information Table 8. Order codes Order code TS4998IQT Temperature range Package -40°C to +85°C QFN16 4x4mm Ordering information Packaging Marking Tape & reel K998 31/33 ...

  • Page 32

    Revision history 7 Revision history Table 9. Document revision history Date 20-Dec-2007 32/33 Revision 1 Initial release. TS4998 Changes ...

  • Page 33

    ... TS4998 Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. ...