LED Drivers for LCD Backlights
Backlight LED Drivers
for Small LCD Panels (Charge Pump Type)
BD1604MUV, BD1604MVV
No.11040EBT23
●Description
This LSI is a 4 white LED driver for small LCD backlight. At the charge pump type, the number of external devices is
minimized.
●Features
1) 4 parallel LED driver is mounted.
2) The LED current can be controlled via an external resistance.
3) Maximum current is 120mA (30mA × 4).
4) LED1 to LED4 can be turned on or off via an external control pin.
5) The relative current accuracy among LEDs (LED1 to LED4) is 3%.
6) Automatically transition to each mode (×1.0, ×1.5, ×2.0).
7) High efficiency (90% or more at maximum) is achieved.
8) Various protection functions such as output voltage protection function, current overload limiter and thermal shutdown
circuit are mounted.
●Applications
This driver provides for:
- Backlight using white LED
- Auxiliary lights for mobile phone cameras and simplified flash
●Lineup
Parameter
BD1604MUV
BD1604MVV
4ch
4ch
120mA
120mA
VQFN016V3030
3.00mm×3.00mm
SQFN016V4040
4.00mm×4.00mm
Number of LED channels
Maximum current
Package
●Absolute Maximum Rating (Ta=25℃)
Parameter
Power supply voltage
Symbol
Ratings
Unit
Vmax
7
V
1
BD1604MUV
Allowable loss
700 *
Pd
BD1604MVV
780 *2
mW
Operating temperature range
Topr
－30~85
℃
Storage temperature range
Tstr
－55~150
℃
*1
*2
When a glass epoxy substrate (70mm×70mm×1.6mm) has been mounted, this loss will decrease 5.6mW/℃ if Ta is higher than or equal to 25℃.
When a glass epoxy substrate (70mm×70mm×1.6mm) has been mounted, this loss will decrease 6.24mW/℃ if Ta is higher than or equal to 25℃.
●Recommended Operation Range
Parameter
Operating supply voltage
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© 2011 ROHM Co., Ltd. All rights reserved.
Symbol
Limits
Unit
VBAT
2.7～5.5
V
1/10
Condition
VBAT voltage
2011.06 - Rev.B
Technical Note
BD1604MUV, BD1604MVV
●Reference Data (Evaluation under LED VF=3.2V)
100
2
0.4
0.3
0.2
Ta=85℃
Ta=25℃
Ta=-30℃
0.1
90
1.5
EFFICIENCY [%]
Current Consumption : IQ1.0 [µA]
STAND-BY Current : Istb [µA]
0.5
Ta=85℃
1
Ta=25℃
DOWN
80
70
60
0.5
50
UP
Ta=-30℃
0
0
3
3.5
4
4.5
5
INPUT VOLTAGE : VBAT[V]
5.5
0
1
2
3
4
INPUT VOLTAGE : VBAT[V]
Fig.1 Circuit Current
(Standby)
40
2.5
5
100
100
90
5.5
Fig.3 Efficiency Hysteresis
(20mA × 4 LEDs)
Fig.2 Circuit Current
(×1.0 Mode Operation)
100
3
3.5
4
4.5
5
SUPPLY VOLTAGE : VBAT[V]
90
Ta=-30℃
90
60
50
80
70
60
Ta=25℃
50
40
2.5
3
3.5
4
4.5
5
SUPPLY VOLTAGE : VBAT[V]
60
Ta=25℃
Ta=85℃
3
3.5
4
4.5
5
SUPPLY VOLTAGE : VBAT[V]
40
2.5
5.5
15
10
5
0
20
Ta=25℃
LED CURRENT : ILED [mA]
LED CURRENT : ILED [mA]
Ta=25℃ Ta=-30℃
Ta=-30℃
15
10
5
1.2
Ta=85℃
20
Ta=25℃
Ta=-30℃
15
10
5
0
0
0.3
0.6
0.9
LED VOLTAGE : VLED[V]
5.5
25
Ta=85℃
Ta=85℃
20
3
3.5
4
4.5
5
SUPPLY VOLTAGE : VBAT[V]
Fig.6 Efficiency
(20mA × 4 LEDs)
25
25
LED CURRENT : ILED [mA]
70
Fig.5 Efficiency
(15mA × 4 LEDs)
Fig.4 Efficiency
(5mA × 4 LEDs)
0
80
50
Ta=85℃
40
2.5
5.5
EFFICIENCY [%]
70
EFFICIENCY [%]
EFFICIENCY [%]
Ta=-30℃
Ta=85℃
Ta=25℃
Ta=-30℃
80
0
0.3
0.6
0.9
LED VOLTAGE : VLED[V]
1.2
Fig.8 LED Current (20mA)
(VBAT=3.6V)
Fig.7 LED Current (20mA)
(VBAT=2.7V)
0
0.3
0.6
0.9
LED VOLTAGE : VLED[V]
1.2
Fig.9 LED Current (20mA)
(VBAT=5.5V)
25
35
30
20
ILED [mA]
ILED [mA]
25
20
15
15
10
10
5
5
0
0
0
50
100
RSET[kO]
150
200
Fig.10 LED Current vs. RSET
(Ta=25℃)
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© 2011 ROHM Co., Ltd. All rights reserved.
0
20
40
60
PWM DUTY[%]
80
100
Fig.11 LED Current vs. PWM Duty
(Cycle 100Hz)
3/10
2011.06 - Rev.B
