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TS4621ML Datasheet(PDF) 2 Page - STMicroelectronics

Part # TS4621ML
Description  High-performance class-G stereo headphone amplifier
PDF  40 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TS4621ML Datasheet(HTML) 2 Page - STMicroelectronics

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Contents
TS4621ML
2/40
Doc ID 023181 Rev 1
Contents
1
Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 5
2
Typical application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.1
Gain control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.2
Overview of the class-G, 2-level headphone amplifier . . . . . . . . . . . . . . . 25
4.3
External component selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.3.1
Step-down inductor selection (L1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.3.2
Step-down output capacitor selection (Ct) . . . . . . . . . . . . . . . . . . . . . . . 27
4.3.3
Full capacitive inverter capacitors selection (C12 and CSS) . . . . . . . . . 28
4.3.4
Power supply decoupling capacitor selection (Cs) . . . . . . . . . . . . . . . . . 28
4.3.5
Input coupling capacitor selection (Cin) . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.3.6
Low-pass output filter (Rout and Cout) and
IEC 61000-4-2 ESD protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.3.7
Integrated input low-pass filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
4.4
Single-ended input configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
4.4.1
Layout recommendations for single-ended operation . . . . . . . . . . . . . . 32
4.5
Startup phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.5.1
Auto zero technology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.5.2
Input impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.6
Layout recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.6.1
Common-mode sense layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
7
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39



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