MM1365 [MITSUMI]
Step-Up IC For EL Backlights; 升压IC，用于EL背光源
| 型号： | MM1365 |
| 厂家： | 
MITSUMI ELECTRONICS, CORP. |
| 描述： | Step-Up IC For EL Backlights |
| 文件： | 总4页 (文件大小：112K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Step-Up IC For EL Backlights MM1365
MITSUMI
Step-Up IC For EL Backlights
Monolithic IC MM1365
Outline
This is a step-up IC developed for use in EL backlights.
Because of their ability to light the entire panel uniformly, EL backlights are gradually becoming more
widespread compared with LEDs.
In particular, recently there has been a strong tendency toward smaller sizes and lighter weights, and more
manufacturers are adopting ICs in place of transformers to step up voltages.
This IC was designed to meet these market needs.
Features
1. Low-voltage driving possible
2. Brightness can be adjusted
VIN=0.95V min.
The brightness can be adjusted by changing the oscillation
frequency through the externally mounted capacitance
Coil inductance of about 820µH required
Current consumption while off=10µA or less
3. Can be driven using a small coil
4. On/off control possible
Package
VSOP-8
Applications
1. Pagers
2. Portable phones, PHS
3. Wristwatches
4. Display components of remote-controlled minidiscs, CD players, headphone stereos, other equipment
Pin Assignment
1
2
3
4
GND
N.C
GND
CT1
For setting discharge frequency
For setting charging frequency
8
1
7
2
6
3
5
4
CT2
Power supply
switch
VCC
5
6
7
H to turn on, L to turn off
Power supply pin
-
VSOP 8
Charging frequency setting; drives
external transistor
O2
O1
Discharge frequency setting; drives
external transistor
8
Step-Up IC For EL Backlights MM1365
MITSUMI
Absolute Maximum Ratings
Item
Symbol
TSTG
Ratings
40~+125
20~+75
0.3~+6
0.95~+6
Units
°C
°C
V
Storage temperature
-
-
-
Operating temperature
Power supply voltage
Operating power supply voltage
Voltage applied to O1, O2 output pins
Allowable loss
TOPR
VCC max.
VCCOP
VO max.
Pd
V
-0.3~VCC
V
300
mW
(Except where noted otherwise, Ta=25°C, VCC=1.5V, VCONT=1.5V)
Electrical Characteristics
Measurement
Item
Symbol
Measurement conditions Min. Typ. Max. Units
circuit
Consumption current for complete circuit 1
(under recommended circuit
operating conditions for EL)
Consumption current for 2 IC only
(under recommended circuit
operating conditions for EL)
Current consumption 3
(entire circuit off)
C1=39nF, C2=1.5nF
15 25 35 mA
SW1 OFF, SW2 ON
ICC1
1
C1=39nF, C2=1.5nF
1.3 2.5 4.5 mA
SW1 ON, SW2 OFF
ICC2
1
ICC3
ISOU1
ISIN
1
2
2
2
2
2
V
CONT=0V, SW1 ON, SW2 OFF
1.0 µA
O1 pin output current
(charge signal)
VO1=0V, VCT1=0.8V
25 50 75 µA
O1 output current measurement
VCT1=0V, VO1=0.3V
VCT2=0V
O1 pin sync current
1.00 2.50
mA
(charge signal)
O2 pin output current
(discharge signal)
ISOU2
ICT1
ICT2
VCT1=0V, VCT2=0V
1.00 1.80 3.00 mA
1.2 2.0 2.7 µA
CT1 charge current
VCT1=0.3V, CT2=OPEN
CT1 output current
VCT1=0V, VCT2=0.3V
CT2 output current
SW1 OFF, SW2 ON
SW1 OFF, SW2 ON
SW1 OFF, SW2 ON
SW1 OFF, SW2 ON
C1=39nF, C2=1.5nF
SW1 OFF, SW2 ON
(Discharge setting pin)
CT2 charge current
10 18 25 µA
(charge setting pin)
CT1 pin "H" threshold
CT2 pin "H" threshold
CT1 pin "L" threshold
CT2 pin "L" threshold
Charge signal oscillation frequency
(CT2 measurement)
VTHH1
VTHH2
VTHL1
VTHL2
1
1
1
1
0.65
0.65
0.15
0.18
V
V
V
V
20
kHz
fct2
1
Step-Up IC For EL Backlights MM1365
MITSUMI
Block Diagram/Application Circuits
Note 1: C3 is a capacitance used to suppress abnormal voltages at the O1
pin due to the coil.
Note 2: The O2 frequency and O1 frequency are set to 20 kHz and 100 Hz
respectively.
Measuring Circuit
Measuring Circuit 1
Step-Up IC For EL Backlights MM1365
MITSUMI
Measuring Circuit 2
Timing Chart
1.5V
VCC
1.5V
0V
CONT
0V
fCT2
Unsettled
VTHH2
CT2
02
VTHL2
fCT1
VTHH1
VTHL1
CT1
01
V
ELOUT
Characteristics
O1, O2 capacitances vs. frequency
O1 pin frequency
O2 pin frequency
1000
1000000
O2 pin
O1 pin
Oscillation
frequency
(charging)
Oscillation
frequency
(charging)
100
10
10000
1000
1
10
100
1000
0.1
1
10
Capacitance (nF)
Capacitance (nF)
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