LQM2MPN3R3G0L datasheet(2/48 Pages) STMICROELECTRONICS

Part #	LQM2MPN3R3G0L

Description	High-performance class-G stereo headphone amplifier with I2C volume control

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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2 / 48 page

Contents

TS4621B

2/48

Doc ID 022194 Rev 2

Contents

1

Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 6

2

Typical application schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3

Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4

Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

4.1

I2C bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

4.1.1

I²C bus operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

4.1.2

Control register CR1 - address 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

4.1.3

Control register CR2 - address 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

4.1.4

Control register CR3 - address 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

4.1.5

Summary of output impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

4.2

Wake-up and standby time definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

4.3

Overview of the class-G, 2-level headphone amplifier . . . . . . . . . . . . . . . 31

4.4

External component selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

4.4.1

Step-down inductor selection (L1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

4.4.2

Step-down output capacitor selection (Ct) . . . . . . . . . . . . . . . . . . . . . . . 33

4.4.3

Full capacitive inverter capacitors selection (C12 and Css) . . . . . . . . . 34

4.4.4

Power supply decoupling capacitor selection (Cs) . . . . . . . . . . . . . . . . . 34

4.4.5

Input coupling capacitor selection (Cin) . . . . . . . . . . . . . . . . . . . . . . . . . 34

4.4.6

Low-pass output filter (Rout and Cout) and

IEC 61000-4-2 ESD protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

4.4.7

Integrated input low-pass filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

4.5

Single-ended input configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

4.5.1

Layout recommendations for single-ended operation . . . . . . . . . . . . . . 38

4.6

Startup phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

4.6.1

Auto zero technology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

4.6.2

Input impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

4.7

Layout recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

4.7.1

Common mode sense layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

4.8

Demonstration board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

5

Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

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