MITSUMI MM1365

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
3. Can be driven using a small coil
4. On/off control possible
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
Package
VSOP-8
Applications
1.
2.
3.
4.
Pagers
Portable phones, PHS
Wristwatches
Display components of remote-controlled minidiscs, CD players, headphone stereos, other equipment
Pin Assignment
8
1
7
2
6
3
5
4
1
GND
2
N.C
3
CT1
For setting discharge frequency
4
CT2
For setting charging frequency
5
Power supply
switch
6
VCC
7
O2
8
O1
VSOP-8
GND
H to turn on, L to turn off
Power supply pin
Charging frequency setting; drives
external transistor
Discharge frequency setting; drives
external transistor
Step-Up IC For EL Backlights MM1365
MITSUMI
Absolute Maximum Ratings
Item
Symbol
Ratings
Units
Storage temperature
TSTG
-40~+125
°C
Operating temperature
TOPR
-20~+75
°C
Power supply voltage
VCC max.
-0.3~+6
V
Operating power supply voltage
VCCOP
0.95~+6
V
Voltage applied to O1, O2 output pins
VO max.
-0.3~VCC
V
Allowable loss
Pd
300
mW
Electrical Characteristics
Item
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)
O1 pin output current
(charge signal)
O1 pin sync current
(charge signal)
O2 pin output current
(discharge signal)
CT1 charge current
(Discharge setting pin)
CT2 charge current
(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)
(Except where noted otherwise, Ta=25°C, VCC=1.5V, VCONT=1.5V)
Symbol
Measurement
circuit
Measurement conditions
ICC1
1
C1=39nF, C2=1.5nF
SW1 OFF, SW2 ON
15
25
35
ICC2
1
C1=39nF, C2=1.5nF
SW1 ON, SW2 OFF
1.3
2.5
4.5 mA
ICC3
1
VCONT=0V, SW1 ON, SW2 OFF
ISOU1
2
ISIN
2
ISOU2
2
ICT1
2
ICT2
2
VTHH1
VTHH2
VTHL1
VTHL2
1
1
1
1
fct2
1
Min. Typ. Max. Units
1.0
VO1=0V, VCT1=0.8V
25 50 75
O1 output current measurement
VCT1=0V, VO1=0.3V
1.00 2.50
VCT2=0V
VCT1=0V, VCT2=0V
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
mA
µA
µA
mA
1.00 1.80 3.00 mA
1.2
2.0
2.7
µA
10
18
25
µA
0.65
0.65
0.15
0.18
V
V
V
V
20
kHz
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
CONT
0V
0V
fCT2
Unsettled
VTHH2
CT2
VTHL2
02
fCT1
VTHH1
CT1
VTHL1
01
VELOUT
Characteristics
O1, O2 capacitances vs. frequency
O1 pin frequency
O2 pin frequency
1000
O2 pin
Oscillation
frequency
(charging)
10000
1000
Frequency (Hz)
Frequency (Hz)
1000000
100
10
0.1
1
Capacitance (nF)
10
O1 pin
Oscillation
frequency
(charging)
1
10
100
Capacitance (nF)
1000