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MITSUMI
Step-Up IC For EL Backlights MM1365
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 820H required Current consumption while off=10A 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
1 2 8 7 6 5 3 4 1 2 3 4 5 6 VSOP-8 7 O2 O1 GND N.C CT1 CT2 Power supply switch VCC For setting discharge frequency For setting charging frequency H to turn on, L to turn off Power supply pin Charging frequency setting; drives external transistor Discharge frequency setting; drives external transistor GND
8
MITSUMI
Step-Up IC For EL Backlights MM1365
Absolute Maximum Ratings
Item Storage temperature Operating temperature Power supply voltage Operating power supply voltage Voltage applied to O1, O2 output pins Allowable loss Symbol TSTG TOPR VCC max. VCCOP VO max. Pd Ratings -40~+125 -20~+75 -0.3~+6 0.95~+6 -0.3~VCC 300 Units C C V V V 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=25C, VCC=1.5V, VCONT=1.5V) Measurement circuit 1
Symbol
Measurement conditions C1=39nF, C2=1.5nF SW1 OFF, SW2 ON C1=39nF, C2=1.5nF SW1 ON, SW2 OFF VCONT=0V, SW1 ON, SW2 OFF
Min. Typ. Max. Units
ICC1
15
25
35
mA
ICC2
1
1.3
2.5
4.5 mA
ICC3 ISOU1 ISIN ISOU2 ICT1 ICT2 VTHH1 VTHH2 VTHL1 VTHL2 fct2
1 2 2 2 2 2 1 1 1 1 1
1.0
A A mA
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
1.00 1.80 3.00 mA 1.2 10 2.0 18 0.65 0.65 0.15 0.18 20 2.7 25 A A V V V V kHz
MITSUMI
Step-Up IC For EL Backlights MM1365
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
MITSUMI
Step-Up IC For EL Backlights MM1365
Measuring Circuit 2
Timing Chart
1.5V
VCC
1.5V
CONT CT2
0V
fCT2
0V
Unsettled
VTHH2 VTHL2
02
fCT1
VTHH1
CT1
VTHL1
01
VELOUT
Characteristics
O1, O2 capacitances vs. frequency
O2 pin frequency
1000000 1000
O1 pin frequency
Frequency (Hz)
Frequency (Hz)
10000
O2 pin Oscillation frequency (charging)
100
O1 pin Oscillation frequency (charging)
1000
10 0.1 1 10
1
10
100
1000
Capacitance (nF)
Capacitance (nF)

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