MAX98502 Datasheet, PDF (1/15 Pages) Maxim Integrated Products – Boosted 2.2W Class D Amplifier with Automatic Level Control

19-6145; Rev 0; 12/11
Boosted 2.2W Class D Amplifier
with Automatic Level Control
General Description
The MAX98502 is a high-efficiency, Class D audio ampli-
fier that features an integrated boost converter to deliver
a constant output power over a wide range of battery
supply voltages.
The boost converter operates at 2MHz, requiring only a
small (2.2FH) external inductor and capacitor.
The automatic level control has a battery tracking func-
tion that reduces the output swing as the supply voltage
drops, preventing collapse of battery voltage.
The amplifier has differential inputs and an internal fully
differential design. The MAX98502 also features three
gain settings (6dB, 15.5dB, and 20dB) that are select-
able with a logic input.
The MAX98502 is available in a small, 0.5mm pitch
16-bump WLP package (2.1mm x 2.1mm). It is specified
over the extended -40NC to +85NC temperature range.
Applications
Cell Phones
Smartphones
GPS Devices
Mobile Internet Devices
Active Speaker Accessories
Features
S Boosted Class D Output
S Integrated Automatic Level Control
S Output Power
2.2W into 8I, 10% THD+N
1.7W into 8I, 1% THD+N
4.1W into 4I, 10% THD+N
3.4W into 4I, 1% THD+N
S Wide 2.5V to 5.5V Supply Voltage Range
S Undervoltage Lockout Protection
S High Total Efficiency of 87%
S High Step-Up Switching Frequency (2MHz)
S Active Emission Limiting for Low EMI
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX98502EWE+ -40NC to +85NC
16 WLP
+Denotes a lead(Pb)-free/RoHS-compliant package.
Typical Application Circuit appears at end of data sheet.
Simplified Block Diagram
BATTERY
SDBST D4
SDSPK C3
GAIN B2
RKNEE B3
INP D2
INN D3
CONTROL
VBAT
B4
LX
A3
BOOST CONVERTER
MAX98502
A2
V_CCOUT
A1 PVDD
DIFFERENTIAL
INPUT
GAIN
C4
AGND
A4
BSTPGND
OUTPUT
STAGE
D1, C2
SPKPGND
B1 SPKP
C1 SPKN
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