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
Number of LED channels
Maximum current
Package
●Absolute
Maximum Rating (Ta=25℃)
Parameter
Power supply voltage
BD1604MUV
Allowable loss
BD1604MVV
Operating temperature range
Storage temperature range
*1
*2
BD1604MUV
4ch
120mA
VQFN016V3030
3.00mm×3.00mm
BD1604MVV
4ch
120mA
SQFN016V4040
4.00mm×4.00mm
Symbol
Vmax
Ratings
7
700 *
1
Unit
V
Pd
780 *
Topr
Tstr
2
mW
－30~85
－55~150
℃
℃
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
Symbol
VBAT
Limits
2.7½5.5
Unit
V
Condition
VBAT voltage
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© 2011 ROHM Co., Ltd. All rights reserved.
1/10
2011.06 - Rev.B
BD1604MUV, BD1604MVV
●Electrical
Characteristics
Unless otherwise specified, Ta is 25℃ and VBAT is 3.6V.
Parameter
[Circuit current]
Circuit current 0
Circuit current 1.0
Circuit current 1.5
Circuit current 2.0
I
Q0
I
Q1.0
I
Q1.5
I
Q2.0
-
-
-
-
0.1
1.0
2.3
2.5
1
2.0
3.3
3.5
μA
mA
mA
mA
EN=0V
Symbol
Limits
Min.
Typ.
Max.
Unit
Technical Note
Condition
x1.0 Mode, Iout = 0mA
x1.5 Mode, Iout = 0mA
X2.0 Mode, Iout = 0mA
Unless otherwise specified, Ta is 25℃ and VBAT is 3.6V.
Parameter
[Current driver]
LED maximum current
LED current accuracy
LED current matching
LED pin control voltage
ISET voltage
Oscillation frequency
Over current limiter
LED current limiter
I
LEDmax
I
LEDdiff
I
LEDmatch
V
LED
I
SET
Fosc
I
OV
I
LEDOV
-
-
-
0.08
0.5
0.8
-
40
-
0.5
0.5
0.10
0.6
1.0
600
60
30
5.0
3.0
0.20
0.7
1.2
900
100
mA
%
%
V
V
MHz
mA
mA
I
LED
=10mA
I
LED
=10mA *1)
Minimum voltage
at LED1~LED4 pins
Symbol
Limits
Min.
Typ.
Max.
Unit
Condition
*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
[Control Signal etc.]
Input ’H’ voltage
Input ’L’ voltage
Input ‘H’ current1
Input ‘H’ current2
Input ‘L’ current
V
IH
V
IL
I
IH1
I
IH2
I
IL
1.4
-
-
-
-1
-
-
18.3
0
0
-
0.4
30
1
-
V
V
μA
μA
μA
EN,SEL0,SEL1,SEL2
EN,SEL0,SEL1,SEL2
EN=5.5V
SEL0,SEL1,SEL2=5.5V
EN,SEL0,SEL1,SEL2=0V
Symbol
Limits
Min.
Typ.
Max.
Unit
Condition
Unless otherwise specified, Ta is 25℃ and VBAT is 3.6V.
Parameter
[Control Signal etc.]
UVLO detecting voltage
V
UVLO
1.9
2.2
2.5
V
Symbol
Limits
Min.
Typ.
Max.
Unit
Condition
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2/10
2011.06 - Rev.B
BD1604MUV, BD1604MVV
●Reference
Data (Evaluation under LED V
F
=3.2V)
0.5
Current Consumption : IQ1.0 [µA]
STAND-BY Current : Istb [µA]
Technical Note
2
100
90
0.4
1.5
EFFICIENCY [%]
80
70
60
50
DOWN
0.3
1
Ta=85
℃
Ta=25
℃
0.2
0.1
Ta=85
℃
Ta=25
℃
Ta=-30
℃
0.5
UP
Ta=-30
℃
0
3
3.5
4
4.5
5
INPUT VOLTAGE : VBAT[V]
5.5
0
0
1
2
3
4
INPUT VOLTAGE : VBAT[V]
5
40
2.5
3
3.5
4
4.5
5
SUPPLY VOLTAGE : VBAT[V]
5.5
Fig.1 Circuit Current
(Standby)
100
90
EFFICIENCY [%]
EFFICIENCY [%]
Fig.2 Circuit Current
(×1.0 Mode Operation)
100
90
Ta=-30
℃
EFFICIENCY [%]
100
90
Fig.3 Efficiency Hysteresis
(20mA × 4 LEDs)
Ta=-30
℃
80
70
60
50
40
2.5
Ta=85
℃
Ta=25
℃
Ta=-30
℃
80
70
60
50
40
2.5
80
70
60
50
Ta=85
℃
5.5
40
2.5
3
3.5
4
4.5
5
SUPPLY VOLTAGE : VBAT[V]
5.5
Ta=25
℃
Ta=85
℃
3
3.5
4
4.5
5
SUPPLY VOLTAGE : VBAT[V]
Ta=25
℃
3
3.5
4
4.5
5
SUPPLY VOLTAGE : VBAT[V]
5.5
Fig.4 Efficiency
(5mA × 4 LEDs)
25
Ta=85
℃
LED CURRENT : ILED [mA]
LED CURRENT : ILED [mA]
20
Ta=25
℃
Ta=-30
℃
15
25
Fig.5 Efficiency
(15mA × 4 LEDs)
25
Ta=85
℃
LED CURRENT : ILED [mA]
20
Ta=25
℃
15
Ta=-30
℃
20
Fig.6 Efficiency
(20mA × 4 LEDs)
Ta=85
℃
Ta=25
℃
Ta=-30
℃
15
10
10
10
5
5
5
0
0
0.3
0.6
0.9
LED VOLTAGE : VLED[V]
1.2
0
0
0.3
0.6
0.9
LED VOLTAGE : VLED[V]
1.2
0
0
0.3
0.6
0.9
LED VOLTAGE : VLED[V]
1.2
Fig.7 LED Current (20mA)
(VBAT=2.7V)
35
30
25
ILED [mA]
20
15
10
5
0
0
50
100
RSET[kO]
150
200
5
ILED [mA]
15
25
Fig.8 LED Current (20mA)
(VBAT=3.6V)
Fig.9 LED Current (20mA)
(VBAT=5.5V)
20
10
0
0
20
40
60
PWM DUTY[%]
80
100
Fig.10 LED Current vs. RSET
(Ta=25℃)
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© 2011 ROHM Co., Ltd. All rights reserved.
Fig.11 LED Current vs. PWM Duty
(Cycle 100Hz)
3/10
2011.06 - Rev.B
BD1604MUV, BD1604MVV
●Block
Diagram, Recommended Circuit Example and Pin Location Diagram
Technical Note
GND
12
11
10
9
LED1 13
C1N
C2N
C2P
8
C1P
LED2 14
BD1604MUV
BD1604MVV
7
VBAT
LED3 15
6
VOUT
LED4 16
5
ISET
1
EN
2
SEL0
3
SEL1
4
SEL2
Fig.12 Pin Location Diagram
(Top View)
C1
C1N
C1P
C2N
C2
C2P
Battery
VBAT
Cin
×1, ×1.5, ×2
Charge pump
Over Voltage
Protect
Charge Pump
Mode Control
VOUT
Cout
EN
OSC
SEL0
Control
SEL1
TSD
Vout Control
LED1
LED2
LED3
LED4
SEL2
ISET
Rset
ISET
Resistor Driver
GND
Current Driver
Fig.13 Block Diagram and Recommended Circuit Diagram
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© 2011 ROHM Co., Ltd. All rights reserved.
4/10
2011.06 - Rev.B
BD1604MUV, BD1604MVV
Technical Note
[Pin table]
Pin name
EN
SEL0
SEL1
SEL2
ISET
VOUT
VBAT
C1P
C1N
C2N
C2P
GND
LED1
LED2
LED3
LED4
Pin number
BD1604MUV
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
BD1604MVV
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin circuit
diagram
F
E
E
E
G
C
H
B
A
A
B
I
D
D
D
D
●I/O
Equivalence Circuit Diagram
The following shows I/O equivalence circuits.
A
B
C
D
PAD
PAD
PAD
PAD
E
F
G
H
PAD
PAD
PAD
PAD
I
PAD
Fig.14 Pin Diagram
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5/10
2011.06 - Rev.B
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