Diodes PAM8904 User Manual
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PAM8904
Description
The PAM8904 is a piezo sounder driver with integrated a charge
pump boost converter. The PAM8904 is capable for driving a
ceramic/piezo sounder with 18Vpp from a 3V power supply. The
charge pump can operate in either of a 1X, 2X and 3X mode.
The boost converter operates at a fixed frequency of 1.0MHz and
provides a 9V output with a minimum number of external
components. The PAM8904 can drive up to 15nF loading. PAM
unique drive technology provides small inrush current, low EMI and
high efficiency.
PAM8904 built-in automatic shutdown and wake up that guarantees
longer battery life.
PAM8904 features thermal shutdown, over current protection, over
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voltage protection and under voltage lock-out.
The PAM8904 is available in a 16pin U-QFN3030 package.
Features
• Supply voltage Range From 2.3V to 5.5V
• 18V
• Integrated Boost Converter Generates 9V Supply
• Input signal 20 Hz to 300KHz
• No Voltage Cross Output At Shutdown Mode
• Low Current Consumption
• Automatic Standby and Wake-up Control
• Available in Space Saving Packages 16pin QFN package
Output from a 3V Supply
PP
18VPP OUTPUT PEIZO SOUNDER DRIVER
Pin Assignments
EN 1 EN2 DIN NC
Applications
• Health Care System
• Alarm Clock
• Security Device
• Home Appliance
U-QFN3030-16L
NC VIN CP2 VOUT
NC CP1 CN2 VO1-
CN1 GND VO2 NC
Typical Applications Circuit
PAM8904
Document number: DS37246 Rev. 1 - 2
1 of 6
www.diodes.com
April 2014
© Diodes Incorporated
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Pin Descriptions
Pin Name I/O/P Function
VIN P Power Supply
EN1 I Charge pump mode select 1
EN2 I Charge pump mode select 2
DIN I Signal Input
CN1 I Capacitor 1 Negative Terminal
GND P Ground
VO2 O Positive Output
VO1 O Negative Output
CN2 I Capacitor 2 Negative Terminal
CP1 I Capacitor 1 Positive Terminal
VOUT O Boost Output
CP2 I Capacitor 2 Positive Terminal
NC — No Connect
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Absolute Maximum Ratings (@ T
Symbol Characteristics Value Unit
VIN
VI
TA
TJ
T
STG
Supply Voltage -0.3 to +6.0 V
EN1, EN2
Operating Free-Air Temperature Range -40 to +85 °C
Operating Junction Temperature Range -40 to +150 °C
Storage Temperature Range -65 to +150 °C
= +25°C, unless otherwise specified.)
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Recommended Operating Conditions (@ T
Symbol Characteristics Min Max Unit
VIN Supply Voltage 2.3 5.0 V
VIH High-Level Input Voltage EN1,EN2
VIL Low-Level Input Voltage EN1,EN2
TA Operating Free-Air Temperature
Thermal Information
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GND -0.3 to V
= +25°C, unless otherwise specified.)
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-0.3 +0.4
-40 +85
1.2 to V
IN
IN
+0.3
+0.3
PAM8904
V
V
V
°C
Parameter Symbol Package Maximum Unit
Thermal Resistance (Junction to Ambient)
Thermal Resistance (Junction to Case)
PAM8904
Document number: DS37246 Rev. 1 - 2
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JA
θ
JC
2 of 6
www.diodes.com
U-QFN3030-16L 35 °C/W
U-QFN3030-16L 14 °C/W
April 2014
© Diodes Incorporated
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