NJU72501
Piezo-sounder Driver with Multi-mode charge pump
GENERAL DESCRIPTION
The NJU72501 is a switching driver with multi mode charge pump
for piezo-sounder. It can drive outputs up to 18Vpp from 3V supply.
For adjusting the piezoelectric sounder sound volume, the charge
pump can operate in either of a 1x, 2x or 3x mode.
Because NJU72501 has the shutdown function, it is suitable for
the battery application.
PACKAGE OUTLINE
NJU72501MJE
APPLICATION
Healthcare, Wrist Watches, Alarm Clocks, Handheld GPS devices, PDAs
FEATURES
Operating Voltage
: 2.3 to 5.0V
Consumption current (Active) : I
DS
=0.3mA typ. (VIN=3V, DIN=4kHz, C
PIEZO
=15nF, 1x Mode)
(Shutdown): I
DS
=1uA max. (VIN=3V , DIN=0V)
Multi-Mode Charge Pump (1x/2x/3x)
Input Signal Detector & Shutdown Control
Output Short-circuit Protection Circuit
C-MOS Technology
Package Outline
: EQFN12-JE
BLOCK DIAGRAM
C
1
=0.1uF
CP1
VIN
C
IN
=0.1uF
Oscillator
(1MHz)
C
2
=0.1uF
CN2
CN1 CP2
Charge Pump
(1x / 2x / 3x)
VOUT
C
OUT
=0.1uF
EN1
EN2
1.7MΩ
DET
Short Circuit
Protection
Control
Logic
DIN
1.7MΩ
GND
Level Shift
VO1
piezo sounder
VO2
Ver. 5.3
-1-
NJU72501
TERMINAL CONFIGURATION (EQFN12-JE)
7pin
10pin
4pin
1pin
PIN DESCRIPTION
Pin No. SYMBOL
1
2
3
4
5
6
EN1
EN2
DIN
CN1
GND
VO2
FUNCTION
Step-up Mode Switch Terminal 1
Step-up Mode Switch Terminal 2
Input Terminal
Capacitor Connection Terminal
GND Terminal
Output Terminal 2
Pin No.
7
8
9
10
11
12
SYMBOL
VO1
CN2
CP1
VOUT
CP2
VIN
FUNCTION
Output Terminal 1
Capacitor Connection Terminal
Capacitor Connection Terminal
Charge Pump Output Terminal
Capacitor Connection Terminal
Power Supply Terminal
-2-
Ver.5.3
NJU72501
NJU3555
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
RATING
UNIT
Supply Voltage
V
IN
5.5
V
Input Voltage
V
DIN
-0.3 to VIN+0.3
V
1)
2)
Power Dissipation
P
D
480
*
/ 1300
*
mW
Operating Temperature
Topr
-40 to +85
°C
Storage Temperature
Tstg
-40 to +125
°C
1)
(Note)
* EIA/JEDEC STANDARD Test board (76.2 x 114.3 x 1.6mm, 2layers, FR-4) mounting
*
2)
EIA/JEDEC STANDARD Test board (76.2 x 114.3 x 1.6mm, 4layers, FR-4) mounting
RECOMMENDED OPEARATING CONDITION
(Ta=25
o
C)
PARAMETER
SYMBOL
CONDITIONS
1x Mode, 2x Mode
Operating Voltage
VIN
1x Mode, 2x Mode, 3x Mode
MIN
2.3
2.3
TYP
3.0
3.0
MAX
5.0
3.4
UNIT
V
ELECTRICAL CHARACTERISTICS
(Ta=25
o
C,V
IN
=3V, C
1
=100nF, C
2
=100nF, C
OUT
=100nF, C
PIEZO
=15nF, DIN=4kHz)
PARAMETER
SYMBOL
CONDITIONS
MIN
V
OUT1
Output Voltage
V
OUT2
V
OUT3
I
DD11
Operating Current 1
I
DD12
I
DD13
I
DD21
Operating Current 2
I
DD22
I
DD23
I
DD31
Operating Current 3
I
DD32
I
DD33
Consumption Current
at Shutdown
Input Frequency
Oscillating Frequency
I
SD
F
IN
F
OSC
1x Mode
2x Mode
3x Mode
1x Mode
C
PIEZO
=no load
2x Mode
C
PIEZO
=no load
3x Mode
C
PIEZO
=no load
1x Mode
Single ended application
2x Mode
Single ended application
3x Mode
Single ended application
1x Mode
Differential application
2x Mode
Differential application
3x Mode
Differential application
DIN=0V ,
(
*
1
Rectangular pulse
2.8
5.2
7.2
-
-
-
-
-
-
-
-
-
-
0.2
0.6
TYP
-
-
-
140
720
2500
0.3
1.4
3.9
0.9
3.6
7.9
-
4
1
MAX
3
6
9
240
1200
4500
-
-
-
-
-
-
1
8
1.8
UNIT
V
V
V
µA
µA
µA
mA
mA
mA
mA
mA
mA
µA
kHz
MHz
(*1: When 50msec or more maintains DIN, EN1, EN2 in 0
Ver.5.3
-3-
NJU72501
ELECTRICAL CHARACTERISTICS
(Ta=25
o
C,V
IN
=3V, C
1
=100nF, C
2
=100nF, C
OUT
=100nF, C
PIEZO
=15nF, DIN=4kHz)
PARAMETER
SYMBOL
CONDITIONS
MIN
1x Mode
-
T
ON1
From DIN signal High to 90% VOUT
steady state
TYP
30
90
180
42
40
MAX
100
200
350
84
60
UNIT
µs
µs
µs
ms
mA
VOUT Start Delay Time
T
ON2
T
ON3
2x Mode
From DIN signal High to 90% VOUT
steady state
-
-
21
20
3x Mode
From DIN signal High to 90% VOUT
steady state
Shutdown Delay Time
Output Short-circuit Protection
Limitation Current
T
OFF
I
SC
DIN=H -> L
CONTROL PART CHARACTERISTICS
Ta=25
o
C, V
IN
=3V
PARAMETER
SYMBOL
Control Terminal Voltage H
Control Terminal Voltage L
Control Terminal Current 1
Control Terminal Current 2
Control Terminal Current 3
V
IH
V
IL
I
IH1
I
IH2
I
IH3
CONDITIONS
EN1 , EN2 , DIN pins
EN1 , EN2 , DIN pins
DIN=3V
V
EN1
, V
EN2
=3V , DIN=3V
V
EN1
, V
EN2
=3V , DIN=0V
MIN
0.8*VIN
TYP
-
-
1.7
1.7
-
MAX
VIN
0.2*VIN
UNIT
V
V
µA
µA
µA
0
-
-
-
3.4
3.4
1
-4-
Ver.5.3
NJU72501
NJU3555
CHARGE PUMP MODE SETTING
DIN
0
1
1
1
1
EN1
-
0
0
1
1
EN2
-
0
1
0
1
Charge Pump Mode
Shut Down Mode
Shut Down Mode
1x Mode
2x Mode
3x Mode
TIMING CHART
V
C/P ON
C/P OFF
VOUT
V
T
ON
DIN
t
V
VO1
t
V
T
OFF
t
VO2
t
Ver.5.3
-5-
嵌入式系统
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