ROHM BD1604MUV Technical data
LED Drivers for LCD Backlights
Backlight LED Drivers
for Small LCD Panels (Charge Pump Type)
BD1604MUV, BD1604M VV
●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
Number of LED channels 4ch 4ch
No.11040EBT23
Maximum current 120mA 120mA
Package
●Absolute Maximum Rating (Ta=25℃)
Parameter Symbol Ratings Unit
Power supply voltage Vmax 7 V
BD1604MUV
Allowable loss
BD1604MVV 780 *2
Operating temperature range Topr －30~85 ℃
Storage temperature range Tstr －55~150 ℃
*1 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℃.
*2 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 Symbol Limits Unit Condition
Operating supply voltage VBAT 2.7～5.5 V VBAT voltage
VQFN016V3030
3.00mm×3.00mm
Pd
SQFN016V4040
4.00mm×4.00mm
1
700 *
mW
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© 2011 ROHM Co., Ltd. All rights reserved.
1/10
2011.06 - Rev.B
BD1604MUV, BD1604M VV
●Electrical Characteristics
Unless otherwise specified, Ta is 25℃ and VBAT is 3.6V.
Parameter Symbol
[Circuit current]
Circuit current 0 IQ0 - 0.1 1 μA EN=0V
Circuit current 1.0 IQ1.0 - 1.0 2.0 mA x1.0 Mode, Iout = 0mA
Circuit current 1.5 IQ1.5 - 2.3 3.3 mA x1.5 Mode, Iout = 0mA
Circuit current 2.0 IQ2.0 - 2.5 3.5 mA X2.0 Mode, Iout = 0mA
Unless otherwise specified, Ta is 25℃ and VBAT is 3.6V.
Parameter Symbol
[Current driver]
LED maximum current ILEDmax - - 30 mA
LED current accuracy ILEDdiff - 0.5 5.0 % ILED=10mA
Min. Typ. Max.
Min. Typ. Max.
Limits
Limits
Unit Condition
Unit Condition
Technical Note
LED current matching ILEDmatch - 0.5 3.0 % ILED=10mA *1)
LED pin control voltage VLED 0.08 0.10 0.20 V
ISET voltage ISET 0.5 0.6 0.7 V
Oscillation frequency Fosc 0.8 1.0 1.2 MHz
Over current limiter IOV - 600 900 mA
LED current limiter ILEDOV 40 60 100 mA
*1) LED current matching = (ILEDmax-ILEDmin)/(ILEDmax+ILEDmin)*100
ILEDmax : Maximum value of LED1-4 current
ILEDmin : Minimum value of LED1-4 current
Unless otherwise specified, Ta is 25℃ and VBAT is 5.5V.
Parameter Symbol
[Control Signal etc.]
Input ’H’ voltage VIH 1.4 - - V EN,SEL0,SEL1,SEL2
Input ’L’ voltage VIL - - 0.4 V EN,SEL0,SEL1,SEL2
Input ‘H’ current1 IIH1 - 18.3 30 μA EN=5.5V
Min. Typ. Max.
Limits
Unit Condition
Minimum voltage
at LED1~LED4 pins
Input ‘H’ current2 IIH2 - 0 1 μA SEL0,SEL1,SEL2=5.5V
Input ‘L’ current IIL -1 0 - μA EN,SEL0,SEL1,SEL2=0V
Unless otherwise specified, Ta is 25℃ and VBAT is 3.6V.
2/10
Limits
Unit Condition
2011.06 - Rev.B
Parameter Symbol
[Control Signal etc.]
UVLO detecting voltage VUVLO 1.9 2.2 2.5 V
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Min. Typ. Max.
BD1604MUV, BD1604M VV
●Reference Data (Evaluation under LED VF=3.2V)
0.5
0.4
0.3
1.5
0.2
0.1
STAND-BY Current : Istb [µA]
0
3 3.5 4 4.5 5 5.5
INPUT VOLTAGE : VBAT[V]
Fig.1 Circuit Current
(Standby)
100
90
80
70
60
EFFICIENCY [%]
50
40
2.533.544.555.5
SUPPLY VOLTAGE : VBAT[V]
Fig.4 Efficiency
(5mA × 4 LEDs)
25
Ta=25
Ta=85℃
℃
20
15
10
5
LED CURRENT : ILE D [mA]
Ta=85℃
Ta=25
Ta=-30
Ta=85
Ta=25℃
Ta=-30
℃
Ta=-30
℃
℃
℃
℃
0.5
Current Consumption : IQ1.0 [µA]
100
90
80
70
60
EFFICIENCY [%]
50
40
25
20
15
10
LED CURRENT : ILE D [mA]
0
0 0.3 0.6 0.9 1.2
LED VOLTAGE : VLED[V]
Fig.7 LED Current (20mA)
(VBAT=2.7V)
35
30
25
20
15
ILED [mA]
10
5
0
0 50 100 150 200
RSET[kO]
Fig.10 LED Current vs. RSET
(Ta=25℃)
25
20
15
ILED [mA]
10
2
Ta=25
Ta=85℃
℃
Ta=-30
℃
1
0
012345
INPUT VOLTAGE : VBAT[V]
Fig.2 Circuit Current
(×1.0 Mode Operation)
Ta=-30
℃
℃
Ta=25
Ta=85℃
2.533.544.555.5
SUPPLY VOLTAGE : VBAT[V]
Fig.5 Efficiency
(15mA × 4 LEDs)
Ta=85℃
Ta=25
℃
5
0
0 0.3 0.6 0.9 1.2
LED VOLTAGE : VLED[V]
Ta=-30
℃
Fig.8 LED Current (20mA)
(VBAT=3.6V)
5
0
0 20406080100
PWM DUTY[%]
Fig.11 LED Current vs. PWM Duty
(Cycle 100Hz)
Technical Note
100
90
DOWN
80
70
60
EFFICIENCY [%]
50
40
2.533.544.5 55.5
Fig.3 Efficiency Hysteresis
100
90
Ta=-30
80
70
60
EFFICIENCY [%]
50
40
2.533.544.555.5
25
20
15
10
5
LED CURRENT : ILE D [mA]
0
0 0.3 0.6 0.9 1.2
Fig.9 LED Current (20mA)
UP
SUPPLY VOLTAGE : VBAT[V]
(20mA × 4 LEDs)
℃
℃
Ta=25
Ta=85℃
SUPPLY VOLTAGE : VBAT[V]
Fig.6 Efficiency
(20mA × 4 LEDs)
Ta=85℃
℃
Ta=25
LED VOLTAGE : VLED[V]
Ta=-30
℃
(VBAT=5.5V)
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© 2011 ROHM Co., Ltd. All rights reserved.
3/10
2011.06 - Rev.B
BD1604MUV, BD1604M VV
●Block Diagram, Recommended Circuit Example and Pin Location Diagram
C2N
C2P
LED1
GND
12 11 10 9
13
Technical Note
C1N
8
C1P
LED2
14
BD1604MUV
7
VBAT
BD1604MVV
6
5
VOUT
ISET
VOUT
Cout
Cin
Battery
VBAT
LED3
15
LED4
16
Charge Pump
Mode Control
1
2 3 4
EN
SEL0
SEL1
Fig.12 Pin Location Diagram
(Top View)
C1
C1N
C2
C2N
C1P
C2P
×1, ×1.5, ×2
Charge pump
Over Voltage
Protect
SEL2
EN
SEL0
SEL1
SEL2
ISET
Rset
Fig.13 Block Diagram and Recommended Circuit Diagram
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© 2011 ROHM Co., Ltd. All rights reserved.
Control
ISET
Resistor Driver
GND
OSC
TSD
4/10
Vout Control
LED1
LED2
LED3
LED4
Current Driver
2011.06 - Rev.B
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