Document
MAX9788
19-0710; Rev 3; 5/08 EVAALVUAAILTAIOBNLEKIT
14VP-P, Class G Ceramic Speaker Driver
General Description
The MAX9788 features a mono Class G power amplifier with an integrated inverting charge-pump power supply specifically designed to drive the high capacitance of a ceramic loudspeaker. The charge pump can supply greater than 700mA of peak output current at 5.5VDC, guaranteeing an output of 14VP-P.
The MAX9788 maximizes battery life by offering highperformance efficiency. Maxim’s proprietary Class G output stage provides efficiency levels greater than Class AB devices without the EMI penalties commonly associated with Class D amplifiers.
The MAX9788 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 MAX9788 is fully specified over the -40°C to +85°C extended temperature range and is available in small lead-free 28-pin TQFN (4mm x 4mm) or 20-bump WLP (2mm x 2.5mm) packages.
Cell Phones Smartphones MP3 Players
Applications
Personal Media Players Handheld Gaming Consoles Notebook Computers
Features
♦ Integrated Charge-Pump Power Supply—No Inductor Required
♦ 14VP-P Voltage Swing into Piezoelectric Speaker ♦ 2.7V to 5.5V Single-Supply Operation ♦ Clickless/Popless Operation ♦ Small Thermally Efficient Packages
4mm x 4mm 28-Pin TQFN 2mm x 2.5mm 20-Bump WLP
Ordering Information
PART
PIN-PACKAGE
MAX9788EWP+TG45 20 WLP
MAX9788ETI+
28 TQFN-EP*
+Denotes a lead-free package.
T = Tape and reel. G45 indicates protective die coating.
*EP = Exposed pad.
TEMP RANGE -40°C to +85°C -40°C to +85°C
Typical Application Circuit/Functional Diagram and Pin Configurations appear at end of data sheet.
Simplified Block Diagram
2.7V TO 5.5V
VCC CPVDD
FB+
MAX9788
CIN
RFB+ RIN+
IN+ +
IN- -
CIN
RINRFB-
FB-
CLASS G OUTPUT STAGE
OUT+ OUT-
CHARGE PUMP
GND CPGND
________________________________________________________________ Maxim Integrated Products 1
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.
14VP-P, Class G Ceramic Speaker Driver
MAX9788
ABSOLUTE MAXIMUM RATINGS
(Voltages with respect to GND.) VCC, CPVDD .............................................................-0.3V to +6V PVSS, SVSS ...............................................................-6V to +0.3V CPGND..................................................................-0.3V to +0.3V OUT+, OUT-...................................(SVSS - 0.3V) to (VCC + 0.3V) IN+, IN-, FB+, FB- ......................................-0.3V to (VCC + 0.3V) C1N .........................................(PVSS - 0.3V) to (CPGND + 0.3V) C1P ......................................(CPGND - 0.3V) to (CPVDD + 0.3V) FS, SHDN ...................................................-0.3V to (VCC + 0.3V) Continuous Current Into/Out of
OUT+, OUT-, VCC, GND, SVSS .....................................800mA
CPVDD, CPGND, C1P, C1N, PVSS.................................800mA Any Other Pin ..................................................................20mA Continuous Power Dissipation (TA = +70°C) 20-Bump WLP (derate 10.3mW/°C above +70°C) (Note 1)..................................................827mW 28-Pin TQFN (derate 20.8mW/°C above +70°C) ........1667mW Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) ................................+300°C Bump Temperature (soldering) Reflow............................+235°C
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a fourlayer board. For detailed information on package thermal considerations, see www.maxim-ic.com/thermal-tutorial.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC = VCPVDD = VSHDN = 3.6V, VGND = VCPGND = 0V, RIN+ = RIN- = 10kΩ, RFB+ = RFB- = 10kΩ, RFS = 100kΩ, C1 = 4.7µF, C2 = 10µF; load connected between OUT+ and OUT-, ZLOAD = 10Ω + 1µF, unless otherwise stated; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Notes 2, 3)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
GENERAL
Supply Voltage Range Quiescent Current Shutdown Current
Turn-On Time
VCC ICC ISHDN
tON
Inferred from PSRR test
SHDN = GND Time from shutdown or power-on to full operation
2.7 5.5 V
8 12 mA
0.3 5
µA
50 ms
Input DC Bias Voltage
VBIAS IN_ in.