PAM8904E
18VPP OUTPUT PIEZO SOUNDER DRIVER
Description
The PAM8904E is a piezo sounder driver with integrated charge
pump boost converter. The PAM8904E is capable of driving a
ceramic/piezo sounder with 27V
PP
from a 4.5V power supply. The
charge pump can operate in either 1x, 2x or 3x mode.
The boost converter operates at a fixed frequency of 100kHz and
provides a 3X V
IN
output with a minimum number of external
Pin Assignments
(Top View)
Pin 1
EN1
EN2
DIN
NC
1
2
3
4
5
6
7
8
NC VIN CP2 VOUT
16
15
14
13
12
11
10
9
NC
CP1
CN2
VO1
NEW PRODUCT
components. The PAM8904E can drive up to 47nF loading. Diodes
Incorporated’s unique drive technology provides a small inrush
current, low EMI and high efficiency.
The PAM8904E includes built-in automatic shutdown and wake up
that guarantees longer battery life. The PAM8904E features thermal
shutdown, over current protection, over voltage protection and under
voltage lock-out.
The PAM8904E is available in U-QFN3030-16 (Type B), U-QFN3030-
12 (Type A) and W-QFN2020-12 (Type US) packages.
Pin 1
CN1 GND VO2 NC
U-QFN3030-16 (Type B)
(Top View)
VIN CP2 VOUT
12
11
10
Features
Supply Voltage Range from 1.5V to 5.5V
18V
PP
Output from a 3V Supply
Integrated Boost Converter Generates up to 13.5V Supply
Input Signal 20Hz to 300kHz
No Voltage Cross Output at Shutdown Mode
Low Current Consumption
Automatic Standby and Wake-up Control
Available in Space Saving Packages U-QFN3030-16 (Type B),
U-QFN3030-12 (Type A) and W-QFN2020-12 (Type US)
Packages
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
EN1
EN2
DIN
1
2
3
4
5
6
9
8
7
CP1
CN2
VO1
CN1 GND VO2
U-QFN3030-12 (Type A)/W-QFN2020-12 (Type US)
Applications
Health Care Systems
Alarm Clocks
Security Devices
Home Appliances
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.
2. See https://www.diodes.com/quality/lead-free/ for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and
Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
PAM8904E
Document number: DS41667 Rev. 1 - 2
1 of 10
www.diodes.com
March 2019
© Diodes Incorporated
PAM8904E
Typical Applications Circuit
C1=1µF
C1=1uF
C2=1µF
C2=1uF
VIN
C
IN
=2.2µF
C
IN
=2.2uF
CP1
CN1 CP2
Charge Pump
(1x / 2x / 3x)
CN2
VOUT
Vout
Oscillator
C
OUT
=2.2µF
C
OUT
=2.2uF
NEW PRODUCT
EN1
EN2
Control
Logic
Short Circuit
Protection
DET
VO1
DIN
GND
Level shift
VO2
Piezo
sounder
Pin Descriptions
Pin Number
U-QFN3030-16
(Type B)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
U-QFN3030-12
(Type A)/
W-QFN2020-12
(Type US)
1
2
3
—
4
5
6
—
7
8
9
—
10
11
12
—
Pin Name
I/O/P
Function
EN1
EN2
DIN
NC
CN1
GND
VO2
NC
VO1
CN2
CP1
NC
VOUT
CP2
VIN
NC
I
I
I
—
I
P
O
—
O
I
I
—
O
I
P
—
Charge pump mode select 1
Charge pump mode select 2
Signal Input
No Connection
Capacitor 1 Negative Terminal
Ground
Positive Output
No Connection
Negative Output
Capacitor 2 Negative Terminal
Capacitor 1 Positive Terminal
No Connection
Boost Output
Capacitor 2 Positive Terminal
Power Supply
No Connection
PAM8904E
Document number: DS41667 Rev. 1 - 2
2 of 10
www.diodes.com
March 2019
© Diodes Incorporated
PAM8904E
Absolute Maximum Ratings
(@ T
A
= +25° unless otherwise specified.)
C,
Symbol
V
IN
V
OUT
V
EN1
, V
EN2
T
A
T
J
T
STG
Supply Voltage
Output Voltage
EN1, EN2 Voltage
Operating Free-Air Temperature Range
Operating Junction Temperature Range
Storage Temperature Range
Characteristics
Value
-0.3 to +6.0
15
GND -0.3 to V
IN
+0.3
-40 to +85
-40 to +150
-65 to +150
Unit
V
V
V
°
C
°
C
°
C
NEW PRODUCT
Recommended Operating Conditions
(@ T
A
= +25° unless otherwise specified.)
C,
Symbol
V
IN
V
IH
V
IL
T
A
Supply Voltage
High-Level Input Voltage
Low-Level Input Voltage
EN1, EN2
EN1, EN2
-0.3
-40
Characteristics
—
Min
1.5
1.2 to V
IN
+0.3
+0.4
+85
Max
5.5
Unit
V
V
V
°
C
Operating Free-Air Temperature
Thermal Information
Symbol
JA
Parameter
Thermal Resistance (Junction to Ambient)
Package
U-QFN3030-16 (Type B)
U-QFN3030-12 (Type A)
W-QFN2020-12 (Type US)
U-QFN3030-16 (Type B)
U-QFN3030-12 (Type A)
W-QFN2020-12 (Type US)
Max
35
35
68
14
14
25
Unit
°
C/W
JC
Thermal Resistance (Junction to Case)
°
C/W
PAM8904E
Document number: DS41667 Rev. 1 - 2
3 of 10
www.diodes.com
March 2019
© Diodes Incorporated
PAM8904E
Electrical Characteristics
(@T
A
= +25° V
IN
= 3.0V, C
PIEZO
= 47nF, f
DIN
= 3.2kHz, unless otherwise specified.)
C,
Symbol
V
OUT
V
OUT1
V
OUT2
V
OUT3
V
OUT4
I
DD11
Output Voltage
Parameter
Output Voltage Range
(Note 4)
1x Mode
2x Mode
3x Mode (Note 5)
3x Mode (V
IN
= 2.7V)
1x Mode, C
PIEZO
= No Load
Operating Current 1
2x Mode, C
PIEZO
= No Load
3x Mode, C
PIEZO
= No Load
1x Mode, Single-ended application
Operating Current 2
2x Mode, Single-ended application
3x Mode, Single-ended application
1x Mode, Differential application
Operating Current 3
Shutdown Current
Input Frequency
Oscillating Frequency
2x Mode, Differential application
3x Mode, Differential application
DIN = 0V
Rectangular pulse
—
1x Mode, From DIN signal High to
90% V
OUT
steady state
2x Mode, From DIN signal High to
90% V
OUT
steady state
3x Mode From DIN signal High to 90%
V
OUT
steady state
DIN = H- > L
—
EN1, EN2, DIN pins
EN1, EN2, DIN pins
DIN = 3V
V
EN1
, V
EN2
= 3V, DIN = 3V
V
EN1
, V
EN2
= 3V, DIN = 0V
Conditions
Min
1.5
2.8
5.2
7.2
6.8
—
—
—
—
—
—
—
—
—
—
—
70
—
—
—
—
—
0.8*V
IN
0
—
—
—
Typ
—
—
—
—
7
43
118
220
0.48
1.9
4.3
1.7
6.4
14.2
0.008
3.2
100
470
1.76
1.91
42
49
—
—
—
—
—
Max
13.5
3
6
9
8.0
—
—
—
—
—
—
—
—
—
1
—
130
—
—
—
—
—
V
IN
0.2*V
IN
5
5
1
Unit
V
V
V
V
V
µA
µA
µA
mA
mA
mA
mA
mA
mA
µA
kHz
kHz
µs
ms
ms
ms
mA
V
V
µA
µA
µA
NEW PRODUCT
I
DD12
I
DD13
I
DD21
I
DD22
I
DD23
I
DD31
I
DD32
I
DD33
I
SD
f
IN
f
OSC
t
ON1
t
ON2
t
ON3
t
OFF
I
SC
V
IH
V
IL
I
IH1
I
IH2
I
IH3
Notes:
VOUT Start Delay Time
Shutdown Delay Time
Output Short-Circuit Current
Control Terminal Voltage H
Control Terminal Voltage L
Control Terminal Current 1
Control Terminal Current 2
Control Terminal Current 3
4. It is possible to drive VOUT, VO1 and VO2 to 3x V
DD
. A supply voltage of 4.5V of more should not be used in 3x mode as this will exceed the maximum
output voltage rating.
5. When designed under 3x mode, it should be carefully noted that the V
OUT
absolute maximum value should not exceed 13.5V.
PAM8904E
Document number: DS41667 Rev. 1 - 2
4 of 10
www.diodes.com
March 2019
© Diodes Incorporated
PAM8904E
Application Information
Charge Pump Mode Setting
The Charge Pump Mode (CPM) pins EN1 and EN2 are used to set the charge pump into mode 1x V
DD
, 2x V
DD
, 3x V
DD
or they can be used to put
the PAM8904E in to a forced low current shutdown mode.
DIN
0
1
1
EN1
—
0
0
1
1
EN2
—
0
1
0
1
MODE
Shutdown Mode
Shutdown Mode
1x Mode
2x Mode
3x Mode
NEW PRODUCT
1
1
V
DD
Range
1.5V to 4.5V
1.5V to 5.5V
Mode
1x, 2x and 3x
1x, 2x
Timing Chart and Device Operation
When one or both of the EN pins are pulled high, the device enters normal operation mode, refer to the above table for the mode selection. Once
the PAM8904E senses a valid signal on the DIN pin, the charge pump will start and provide the desired voltage on the VOUT pin and the output
drive VO1 and VO2 start to function after time t
ON
which is typically between 470µs and 2s depending on the mode chosen. Once the input signal
on DIN is removed, the PAM8904E senses this and waits typically 42ms to ensure the signal has been removed. If there is no further valid signal
within the time period t
OFF
,
the PAM8904E enters into a low current standby mode.
Timing Chart
t
ON
t
OFF
PAM8904E
Document number: DS41667 Rev. 1 - 2
5 of 10
www.diodes.com
March 2019
© Diodes Incorporated
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