Datasheet

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MAX98307/MAX98308

3.3W Mono Class DG Multilevel Audio Amplifier

�� Maxim Integrated Products 1

Simplified Block Diagrams

19-5848; Rev 4; 3/12

For related parts and recommended products to use with this part,

refer to www.maxim-ic.com/MAX98307.related.

General Description

The MAX98307/MAX98308 fully differential mono Class

DG multilevel power amplifiers with integrated inverting

charge pumps offer highly efficient, high-power audio

solutions for portable applications.

Class DG multilevel modulation extends the dynamic

range of the output signal by employing a charge-pump-

generated negative rail as needed to extend the supply

range. This scheme results in high efficiency over a wide

output power range.

The ICs combine Maxim’s active emissions limiting edge

rate and overshoot control circuitry with multilevel out-

put modulation to greatly reduce EMI. These features

eliminate the need for output filtering as compared to

traditional Class D devices, reducing component count

and cost.

The MAX98307’s 16-pin TQFN package features an

adjustable gain set by external resistors. The MAX98308’s

space-saving 12-bump WLP package features an inter-

nally fixed gain of 8.5dB, 11.5dB, 14.5dB, 17.5dB, and

20.5dB set by a single gain input. Both devices operate

over the extended -40NC to +85NC temperature range.

Applications

Benefits and Features

S High Efficiency Combined with High Output Power

Class DG Multilevel Modulation Ensures

Maximum Efficiency Over Wide Output Power

Range

S Improves Battery Life

Low 1.85mA Quiescent Current

S High Output Power at 1% THD+N

1.54W at V

PVDD

= 3.6V, 8I + 68µH Load

2.85W at V

PVDD

= 5V, 8I + 68µH Load

S High Output Power at 10% THD+N

1.77W at V

PVDD

= 3.6V, 8I + 68µH Load

3.3W at V

PVDD

= 5V, 8I + 68µH Load

S 84% Efficiency (V

PVDD

= 3.6V, at 500mW Output)

S Active Emissions Limiting and Class DG Multilevel

Output Modulation Eliminates EMI Output Filtering

Requirement

S Integrated Charge Pump and High Efficiency

Results in Small Solution Size

S Excellent RF Immunity

S Click-and-Pop Suppression

S Thermal and Overcurrent Protection

S Low-Current Shutdown Mode

Ordering Information appears at end of data sheet.

EVALUATION KIT AVAILABLE

Cellular Phones

Smartphones

Notebook Computers

VoIP Phones

Portable Audio

Tablet PCs

PVDD

GND

FB-

FB+

IN-

IN+

SHDN PVSS

PGND

SVSS

C1P

C1N

OUT+

OUT-

CHARGE PUMP

CLASS DG

AMPLIFIER

MAX98307

PVDD

GND

IN-

IN+

SHDN PVSS

PGND

C1P

C1N

OUT+

OUT-

GAIN

CHARGE PUMP

CLASS DG

AMPLIFIER

MAX98308

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Summary of content (21 pages)

PAGE 1
9-5848; Rev 4; 3/12 EVALUATION KIT AVAILABLE MAX98307/MAX98308 3.3W Mono Class DG Multilevel Audio Amplifier General Description Benefits and Features The MAX98307/MAX98308 fully differential mono Class DG multilevel power amplifiers with integrated inverting charge pumps offer highly efficient, high-power audio solutions for portable applications.
PAGE 2
MAX98307/MAX98308 3.3W Mono Class DG Multilevel Audio Amplifier MAX98307 Typical Application Circuit 2.6V TO 5.25 0.1µF 10µF* 0.1µF 10µF VCC SHDN 1 PVDD 13 3 7 FB+ 12 CHARGE PUMP 20kI 0.33µF 10kI SVSS PVSS 14 16 C1P MAX98307 4 OUT+ IN+ 11 0.33µF 10kI 4.7µF 15 C1N CLASS DG AMPLIFIER IN- 10 5 OUT- 20kI 8 N.C. FB- 9 2 6 PGND GND *SYSTEM BULK CAPACITOR MAX98308 Typical Application Circuit 2.6V TO 5.25 10µF* SHDN B2 10µF 0.1µF PVSS PVDD A3 C1 A1 C1P MAX98308 GAIN B3 0.33µF 0.
PAGE 3
MAX98307/MAX98308 3.3W Mono Class DG Multilevel Audio Amplifier ABSOLUTE MAXIMUM RATINGS PVDD to GND...........................................................-0.3V to +6V PGND to GND...................................................... -0.3V to +0.3V C1N to GND........................................... (VPVSS - 0.3V) to +0.3V IN+, IN- (MAX98307)................................. -0.3V to (VCC + 0.3V) VCC to PVDD (MAX98307)................................... -0.3V to +0.3V PVSS to SVSS (MAX97307)..........
PAGE 4
MAX98307/MAX98308 3.3W Mono Class DG Multilevel Audio Amplifier ELECTRICAL CHARACTERISTICS (continued) VPVDD = VCC = VSHDN = 3.6V, VPGND = VGND = 0V, ZL = 8I + 68FH between OUT+ and OUT-, (MAX98307 RIN+ = RIN- = 10kI, RFB+ = RFB- = 20kI), CIN+ = CIN- = 0.33FF, AV = 14.5dB, AC measurement bandwidth 20Hz to 20kHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25NC.
PAGE 5
MAX98307/MAX98308 3.3W Mono Class DG Multilevel Audio Amplifier ELECTRICAL CHARACTERISTICS (continued) VPVDD = VCC = VSHDN = 3.6V, VPGND = VGND = 0V, ZL = 8I + 68FH between OUT+ and OUT-, (MAX98307 RIN+ = RIN- = 10kI, RFB+ = RFB- = 20kI), CIN+ = CIN- = 0.33FF, AV = 14.5dB, AC measurement bandwidth 20Hz to 20kHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25NC.
PAGE 6
MAX98307/MAX98308 3.3W Mono Class DG Multilevel Audio Amplifier Typical Operating Characteristics (VPVDD = VCC = VSHDN = 3.6V, VPGND = VGND = 0V, ZL = 8ω + 68FH between OUT+ and OUT-, AV = 14.5dB (MAX98307 RIN+ = RIN- = 10kω, RFB+ = RFB- = 20kω), CIN+ = CIN- = 0.33µF, AC measurement bandwidth 20Hz to 20kHz.) TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER (MAX98307) THD+N (%) fIN = 6kHz 0.1 1 fIN = 6kHz 0.1 10 0.01 0.5 1.0 1.5 2.0 fIN = 100Hz 1 fIN = 6kHz 0.1 fIN = 1kHz 0.01 0.001 0.
PAGE 7
MAX98307/MAX98308 3.3W Mono Class DG Multilevel Audio Amplifier Typical Operating Characteristics (continued) (VPVDD = VCC = VSHDN = 3.6V, VPGND = VGND = 0V, ZL = 8ω + 68FH between OUT+ and OUT-, AV = 14.5dB (MAX98307 RIN+ = RIN- = 10kω, RFB+ = RFB- = 20kω), CIN+ = CIN- = 0.33µF, AC measurement bandwidth 20Hz to 20kHz.) POUT = 1.3W 0.01 POUT = 1.6W 0.1 0.01 POUT = 700mW 0.001 1k 10k 100k 100 1k 10k 100k 100 1k 10k 100k FREQUENCY (kHz) TOTAL HARMONIC DISTORTION PLUS NOISE vs.
PAGE 8
MAX98307/MAX98308 3.3W Mono Class DG Multilevel Audio Amplifier Typical Operating Characteristics (continued) (VPVDD = VCC = VSHDN = 3.6V, VPGND = VGND = 0V, ZL = 8ω + 68FH between OUT+ and OUT-, AV = 14.5dB (MAX98307 RIN+ = RIN- = 10kω, RFB+ = RFB- = 20kω), CIN+ = CIN- = 0.33µF, AC measurement bandwidth 20Hz to 20kHz.) THD+N = 10% 1.0 0.8 THD+N = 1% 0.6 0.4 THD+N = 10% 1.5 1.0 3.5 THD+N = 1% 0.5 0 1 10 100 THD+N = 10% 2.0 1.5 THD+N = 1% 1.
PAGE 9
MAX98307/MAX98308 3.3W Mono Class DG Multilevel Audio Amplifier Typical Operating Characteristics (continued) (VPVDD = VCC = VSHDN = 3.6V, VPGND = VGND = 0V, ZL = 8ω + 68FH between OUT+ and OUT-, AV = 14.5dB (MAX98307 RIN+ = RIN- = 10kω, RFB+ = RFB- = 20kω), CIN+ = CIN- = 0.33µF, AC measurement bandwidth 20Hz to 20kHz.) 2.5 2.0 1.5 THD+N = 1% 1.0 2.5 THD+N = 10% 2.0 1.5 THD+N = 1% 1.0 0 3.0 3.4 3.8 4.2 4.6 SUPPLY VOLTAGE (V) 5.0 2.6 3.0 3.4 3.8 4.2 4.6 5.0 10 5.4 EFFICIENCY vs.
PAGE 10
MAX98307/MAX98308 3.3W Mono Class DG Multilevel Audio Amplifier Typical Operating Characteristics (continued) (VPVDD = VCC = VSHDN = 3.6V, VPGND = VGND = 0V, ZL = 8ω + 68FH between OUT+ and OUT-, AV = 14.5dB (MAX98307 RIN+ = RIN- = 10kω, RFB+ = RFB- = 20kω), CIN+ = CIN- = 0.33µF, AC measurement bandwidth 20Hz to 20kHz.) EFFICIENCY (%) 60 50 40 30 90 60 80 50 40 30 60 50 40 30 20 20 10 10 10 0 0 0.2 0.4 0.6 0.8 1.0 0 0 1.2 VPVDD = 5V fIN = 1kHz 70 20 0 0.2 0.4 0.6 0.8 1.0 1.
PAGE 11
MAX98307/MAX98308 3.3W Mono Class DG Multilevel Audio Amplifier Typical Operating Characteristics (continued) (VPVDD = VCC = VSHDN = 3.6V, VPGND = VGND = 0V, ZL = 8ω + 68FH between OUT+ and OUT-, AV = 14.5dB (MAX98307 RIN+ = RIN- = 10kω, RFB+ = RFB- = 20kω), CIN+ = CIN- = 0.33µF, AC measurement bandwidth 20Hz to 20kHz.) COMMON-MODE REJECTION RATIO vs.
PAGE 12
MAX98307/MAX98308 3.3W Mono Class DG Multilevel Audio Amplifier IN+ IN- FB- TOP VIEW FB+ Pin/Bump Configurations 12 11 10 9 TOP VIEW (BUMPS SIDE DOWN) MAX98308 2 3 1 4 + VCC 13 PVSS 14 MAX98307 C1N 15 EP 1 2 3 4 GND PVDD OUT+ + SHDN C1P 16 8 N.C. 7 SVSS 6 PGND 5 OUT- A C1P GND PVDD OUT+ B C1N SHDN GAIN OUT- C PVSS IN+ IN- PGND WLP TQFN Pin/Bump Description PIN BUMP MAX98307 MAX98308 1 B2 2 3 4 NAME FUNCTION SHDN Active-Low Shutdown.
PAGE 13
MAX98307/MAX98308 3.3W Mono Class DG Multilevel Audio Amplifier Detailed Description The MAX98307/MAX98308 fully differential mono Class DG multilevel power amplifiers with integrated inverting charge pumps offer highly efficient, high-power audio solutions for portable applications. The new Class DG multilevel modulation scheme extends the dynamic range of the output signal by employing a charge-pump-generated negative rail, which is used as needed to extend the supply range.
PAGE 14
MAX98307/MAX98308 3.3W Mono Class DG Multilevel Audio Amplifier The Class DG multilevel efficiency compares favorably with Class AB and Class G amplifiers as shown in Figure 2. Note that efficiency at 1W is 85%. 90 80 MAX98307/MAX98308 CLASS DG MULTILEVEL AMPLIFIER EFFICIENCY (%) 70 MAX98307 fig02 EFFICIENCY vs. OUTPUT POWER EMI Filterless Output Stage Traditional Class D amplifiers require the use of external LC filters, or shielding, to meet electromagnetic-interference (EMI) regulation standards.
PAGE 15
MAX98307/MAX98308 3.3W Mono Class DG Multilevel Audio Amplifier Click-and-Pop Suppression The speaker amplifier features Maxim’s comprehensive click-and-pop suppression. During startup, the clickand-pop suppression circuitry reduces any audible transient sources internal to the device. When entering shutdown, the differential speaker outputs quickly and simultaneously ramp down to PGND.
PAGE 16
MAX98307/MAX98308 3.3W Mono Class DG Multilevel Audio Amplifier Table 1. MAX98308 Gain Configuration GAIN PREAMPLIFIER GAIN (dB) Unconnected 0 OVERALL GAIN (dB) 8.5 100kI to VPVDD 3 11.5 Short to VPVDD 6 14.5 100kI to PGND 9 17.5 Short to PGND 12 20.5 Note: For both ICs, the Class DG output stage has a fixed gain of 8.5dB. Any gain or attenuation set by the external input stage resistors adds to or subtracts from this fixed gain.
PAGE 17
MAX98307/MAX98308 3.3W Mono Class DG Multilevel Audio Amplifier Thermal Considerations Class DG multilevel amplifiers provide much better efficiency and thermal performance than a comparable Class AB or Class G amplifiers. However, the system’s thermal performance must be considered with realistic expectations and include consideration of many parameters. This section examines Class DG multilevel amplifiers using general examples to illustrate good design practices.
PAGE 18
MAX98307/MAX98308 3.3W Mono Class DG Multilevel Audio Amplifier Package Information For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO. 16 TQFN-EP T1633-5 21-0136 LAND PATTERN NO.
PAGE 19
MAX98307/MAX98308 3.3W Mono Class DG Multilevel Audio Amplifier Package Information (continued) For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.
PAGE 20
MAX98307/MAX98308 3.3W Mono Class DG Multilevel Audio Amplifier Package Information (continued) For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.
PAGE 21
MAX98307/MAX98308 3.