MAX9738:16VP-P Class G Amplifier with Inverting Boost Converter

Industry's Smallest Inductor-Based Boost Solution to Drive Ceramic Speakers from a Li-Ion Battery

The MAX9738 features a mono Class G power amplifier with an integrated inverting boost converter. The Class G amplifier is specifically designed to drive the high capacitance of a ceramic/piezoelectric loud-speaker. The inverting boost converter can typically supply up to 400mA of peak output current, allowing for a constant output of 16VP-P over the 2.7V to 5.5V supply voltage range. The MAX9738 maximizes battery life by offering high-performance efficiency. Maxim’s proprietary output stage provides efficiency levels greater than Class AB devices without the EMI penalties commonly associated with Class D amplifiers. The MAX9738 is ideally suited to deliver the high output voltage swing required to drive ceramic/piezoelectric speakers. The device utilizes fully differential inputs and outputs, comprehensive click-and-pop suppression, shutdown control, and soft-start circuitry. The MAX9738 is fully specified over the -40°C to +85°C extended temperature range and is available in an ultra-small, lead-free 5x4 WLP (2.5mm x 2mm) package.

Key Features
  • Integrated Inverting Boost Converter
  • 2.7V to 5.5V Single-Supply Operation
  • 16VP-P Output Voltage Swing, Ideal for Driving a Ceramic Speaker
  • Maintains Output Voltage Swing as the Battery Decays
  • Clickless/Popless Operation
  • Small, Thermally Efficient 5x4 WLP Package (2.5mm x 2mm)
MAX9738: Simplified Block Diagram
MAX9738: Simplified Block Diagram
Applications/Uses
  • Cellular Phones
  • Handheld Gaming Consoles
  • MP3 Players
  • Notebook Computers
  • Personal Media Players
  • Smartphones
DataSheet
titleDownload file
MAX9738 Data SheetMAX9738.pdf
Parametrics
Part NumberClassSpkr. Amp. VCC
(V)
Spkr. Amp. VCC
(V)
Spkr. Amp. ICC
(mA)
POUT into 8Ω @ 1% THD+N
(W)
Spkr. Amp. Half Pwr. THD+N
(%)
SNR
(dB)
PSRR
(dB)
Package/PinsBudgetary
Price
minmaxtypminA- WeightedminSee Notes
MAX9738Boosted/G2.75.516.50.250.079570WLP/20$0.62 @1k
Quality and Environmental Data
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX9738EVKIT+ActiveEVKIT;-40°C to +85°CSee data sheet
MAX9738EWP+G45ActiveWLP,;20 pin;WLP;-40°C to +85°CLead Free
MAX9738EWP+TG45ActiveWLP,;20 pin;WLP;-40°C to +85°CLead Free
MAX9738.pdf MAX9738
MAX9738.pdf MAX9738
MAX9738.pdf MAX9738
MAX9738.pdf MAX9738
MAX9738.pdf MAX9738