LED Drivers for LCD Backlights
White Backlight LED Drivers
for Medium to Large LCD Panels
(Switching Regulator Type)
BD6066GU, BD6066EKN
No.11040EBT26
●Description
BD6066GU/BD6066EKN are white LED driver ICs with PWM step-up DC/DC converter that can boost max 40.5V and
current driver that can drive max 30mA. The wide brightness can be adjusted to control by external PWM pulse on power
control terminal. And, with extended resolution current driver, a few errors between the lines of the current driver, it is suitable
for decreasing the lacking in brightness of the display. BD6066GU, CSP package type, is suited for saving space.
BD6066EKN, HQFN package type, is suited for mounting on the flexible board.
●Features
1) High efficiency PWM step-up DC/DC converter (fsw=1MHz)
2) Extended resolution current driver 4ch
3) Driving
＊
12 series × 4parallel =48 white LEDs (
＊
white LED Vf=3.2Vmax)
4) Wide input voltage range (2.7V ~ 22V)
5) Rich safety functions
▪
Over-voltage protection (OVP)
▪
Over current limit
▪
External SBD open detect
▪
Thermal shutdown (175
℃)
6) CSP small & thin package
VCSP85H2 2.6 × 2.6 × 0.85mm
HQFN28V 5.2 × 5.2 × 0.95mm
●Applications
Notebook PC, portable DVD player, car navigation systems
●
Absolute maximum ratings (Ta=25
℃)
Parameter
Maximum applied voltage 1
Maximum applied voltage 2
Maximum applied voltage 3
Maximum applied voltage 4
Power dissipation 1 (BD6066GU)
Power dissipation 2 (BD6066EKN)
Power dissipation 3 (BD6066EKN)
Power dissipation 4 (BD6066EKN)
Operating temperature range
Storage temperature range
Symbol
VMAX1
VMAX2
VMAX3
VMAX4
Pd1
Pd2
Pd3
Pd4
Topr
Tstg
Limits
7
15.5
30.5
50.5
1100
*1
560
*2
880
*3
2650
*4
-30 ~ +85
-55 ~ +150
Unit
V
V
V
V
mW
mW
mW
mW
℃
℃
Condition
TEST,ISET,VREG,SENSP,
SENSN, SW, EN1, EN2, PWM
LED1, LED2, LED3, LED4
VBAT
VDET
(*1) The measurement value which was mounted on the PCB by ROHM. When it’s used by more than Ta=25
℃,
it’s reduced by 8.8mW/
℃.
(*2) Reduced 4.5mW/
℃
With Ta>25
℃
when not mounted on a heat radiation Board.
(*3) 70mm x 70mm x 1.6mm glass epoxy Board which has 1 layers (60mm x 60mm). When it’s used by more than Ta=25
℃,
it’s reduced by 7.0mW/
℃.
(*4) 70mm x 70mm x 1.6mm glass epoxy Board which has 2 layers (60mm x 60mm). When it’s used by more than Ta=25
℃,
it’s reduced by 21.2mW/
℃.
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
1/15
2011.06 - Rev.B
BD6066GU,BU6066EKN
●Recommended
operating range (Ta=-30
℃
~ +85
℃)
Parameter
Power supply voltage
BD6066GU
BD6066EKN
Symbol
VBAT
Limits
Min.
2.7
Typ.
12.0
Max.
22.0
Unit
V
Technical Note
Condition
●Electrical
characteristic (Unless otherwise specified, VBAT=12V, Ta = +25
℃)
Limits
Parameter
Symbol
Min.
Typ.
Max.
[EN Terminal]
EN threshold voltage (Low)
EN threshold voltage (High) 1
EN threshold voltage (High) 2
EN terminal input current
EN terminal output current
[PWM Terminal]
Low Input Voltage range
High Input Voltage range1
High Input Voltage range2
PWM pull down resistor
[Regulator]
VREG Voltage
Under Voltage Lock Out
[Switching Regulator]
Input voltage range
Quiescent Current 1
Quiescent Current 2
Current Consumption
LED Control voltage
Over Current Limit voltage
SBD Open Protect
Switching frequency
Duty cycle limit
Over Voltage Limit
Start up time
[Current driver]
LED maximum current
LED current accuracy
LED current matching
ISET voltage
LED current limiter
LED Terminal Over Voltage Protect
ILMAX
ILACCU
ILMAT
Iset
ILOCP
LEDOVP
-
-
-
0.5
35
12.5
-
-
-
0.6
60
13.5
30
±5
±3
0.7
90
14.5
Vin
Iq1
Iq2
Idd
VLED
Ocp
Sop
fSW
Duty
Ovl
Ts
3.1
-
-
-
0.4
70
-
0.8
92.5
40.5
-
12.0
0.6
4.6
3.4
0.5
100
0.2
1.0
95.0
42.0
0.5
22.0
3.4
10
5.1
0.6
130
1.4
1.2
99.0
43.5
1.0
VREG
UVLO
4.0
2.05
5.0
2.35
6.0
2.65
PWML
PWMH1
PWMH2
PWMR
0
1.4
1.4
300
-
-
-
500
0.2
5.0
VBAT
700
VthL
VthH1
VthH2
Iin
Iout
0
1.4
1.4
-
-2.0
-
-
-
8.3
-0.1
0.2
5.0
VBAT
14.0
-
Unit
Condition
V
V
V
µA
µA
VBAT > 5.0V
VBAT < 5.0V
EN=2.5V
EN=0V
V
V
V
kΩ
VBAT > 5.0V
VBAT < 5.0V
V
V
*1
V
µA
µA
mA
V
mV
V
MHz
%
V
ms
EN=0V, VBAT=12V
EN=0V, VBAT=22V
EN=3.6V, VDET=0V,ISET=24kΩ
*2
LED1=LED2=LED3=LED4=0V
LED1=LED2=LED3=LED4=0V
Output voltage=24V
mA
%
%
V
mA
V
ILED=20mA
- Each LED current / Average
(LED1,2,3,4)
- ILED=20mA
*1 Electrical characteristics are guaranteed from 3.1V to 22V and operating is guaranteed from 2.7V to 3.1V.
*2 This parameter is tested with dc measurement.
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
2/15
2011.06 - Rev.B
BD6066GU,BU6066EKN
●Reference
data
5
20
Technical Note
1.3
1.2
25
℃
85℃
4
15
Frequency [MHz]
1.1
1
0.9
0.8
-30℃
85℃
Iin [mA]
3
Ist[µA]
2
-30℃
25℃
10
85℃
25℃
5
1
0
0
5
10
15
VBAT [V]
20
25
0
5
10
15
VBAT[V]
0
-30℃
20
25
0.7
0
5
10
15
VBAT [V]
20
25
Fig.1
Current Consumption - power source voltage
44
Fig.2
Quiescent current - power source voltage
0.4
Fig.3
Oscillation frequency - power source voltage
16
15
43
25℃
VDET[V]
VDET[V]
0.3
-30, 25
℃
LED[V]
-30℃
14
13
12
25℃
-30℃
42
0.2
41
85℃
0.1
85
℃
85℃
11
40
0
5
10
15
VBAT[V]
20
25
0.0
0
5
10
15
VBAT[V]
20
25
10
0
5
10
15
VBAT[V]
20
25
Fig.4
Over Voltage Limit - power source voltage
6
5
4
Fig.5
SBD Open Protect Limit - power source voltage
2.5
Over current detected voltage [mV]
200
Fig.6
LED terminal Over Voltage Protect
vs power source voltage
2
150
2.7V, 3.1V, 6V
100
5V 22V
1.5
VREG[V]
3
2
1
0
0
5
10
15
VBAT[V]
20
25
VBAT [V]
1
50
0.5
0
-50
-25
0
25
Ta [
o
C]
50
75
100
0
-50
-25
0
25
Ta [
o
C]
50
75
100
Fig.7
VREG - power source voltage
21.0
20.8
20.6
20.4
20.2
ILED[mA]
20.0
19.8
19.6
19.4
19.2
19.0
0.20
0.40
0.60
0.80
1.00
1.20
1.40
-30℃
85℃
25℃
21.0
20.8
20.6
20.4
ILED[mA]
Fig.8
UVLO - Temperature
Fig.9
Over Current Limit Voltage - Temperature
21.0
20.8
20.6
20.4
ILED[mA]
20.2
20.0
19.8
19.6
19.4
19.2
19.0
2
3
25℃
20.2
20.0
19.8
19.6
25℃
-30℃
85℃
85℃
-30℃
19.4
19.2
19.0
4
VLED[V]
5
6
7
VLED[V]
8
9
10
0
5
10
15
VBAT[V]
20
25
Fig.10
LED current - LED terminal voltage
( Expansion)
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
Fig.11
LED current - LED terminal voltage
Fig.12
LED current - power source voltage
3/15
2011.06 - Rev.B
BD6066GU,BU6066EKN
Technical Note
100
90
80
70
Efficiency[%]
60
50
40
30
20
10
0
0
5
10
15
VBAT[V]
20
25
25
25℃
-30℃
2
ISET=27kΩ
20
LED current [mA]
LED current [mA]
1.5
ISET=27kΩ
85℃
15
6V, 7.4V, 10.7V, 22V
10
16V
16V
1
22V
10.7V
0.5
5
6V
7.4V
0
0
20
40
60
PWM-HI Duty [
％
]
80
100
0
2
4
6
8 10 12 14 16
PWM-HI Duty [
％
]
18
20
Fig.13
Efficiency - source voltage
25
2
Fig.14
LED current - PWM HI Duty
PWM = 200Hz
VBAT=7.4V
ISET=27kΩ
Fig.15
LED current - PWM HI Duty( Expansion)
PWM = 200Hz
100
90
VBAT=7.4V
ISET=27kΩ
20
LED current
[mA]
85
℃
25
℃
80
70
Dispersion [%]
60
50
40
30
20
10
0
-10
VBAT=7.4V
ISET=27kΩ
1.5
15
25
℃
-30
℃
LED current
[mA]
1
10
VF Dispersion of
LED line interval is 2.6V.
VF Dispersion of LED
line interval is small.
5
85
℃
0.5
-30
℃
0
0
20
40
60
PWM-HI Duty [%]
80
100
0
0
2
4
6 8 10 12 14 16 18 20
PWM-HI Duty [%]
0
20
40
60
PWM-HI Duty [%]
80
100
Fig.16
LED current - PWM HI Duty
PWM = 200Hz
50
40
30
Dispersion [%]
20
10
0
-10
0
5
10
15
20
Duty [%]
25
30
Fig.17
LED current - PWM HI Duty( Expansion)
PWM = 200Hz
100%
VBAT=7.4V
ISET=27kΩ
Fig.18
LED current matching - PWM HI Duty
PWM = 200Hz
50%
40%
30%
VF Dispersion of
LED line interval is 2.6V.
90%
80%
70%
Dispersion
Dispersion
6V
7.4V
10.7V
VF Dispersion of
LED line interval
is small.
60%
50%
40%
30%
20%
10%
6V
7.4V
10.7V
16V
22V
20%
10%
0%
16V
22V
0%
-10%
0
10 20 30 40 50 60 70 80 90 100
-10%
0
5
10
Fig.19
LED current matching - PWM HI Duty
(Expansion) PWM = 200Hz
Output
10V/div
Average current = 0.8mA
PWM-HI Duty [%]
15
20
Duty [%]
25
30
Fig.20
LED current matching - PWM HI Duty
VF Dispersion of LED line interval is 2.6V.
PWM = 200Hz
Fig.21
LED current matching - PWM HI Duty (Expansion)
VF Dispersion of LED line interval is 2.6V.
PWM = 200Hz
Coil current
500mA/div
Fig.22
LED Open Voltage
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
4/15
2011.06 - Rev.B
BD6066GU,BU6066EKN
●Block
diagram, I/O equivalent circuit diagram
VBAT
EN1
VIN detector
EN2
Clump
REG
Clump
SBD Open protect
TSD
over voltage protect
+
-
PIN
VBAT
VBAT
Technical Note
VREG
VBAT
VREG
VBAT
UVLO
PIN
PIN
PIN
Internal Power suplly
+
-
VDET
PWM
GND
A
B
GND
C
VBAT VREG
S
SW
SENSP
SENSN
Current
Sence
Q
R
Control
sence
ERRAMP
-
PWMcomp
-
-
-
-
+
+
PIN
5.5V
GND
GND
E
Clump
PIN
5.5V
GND
F
Clump
LED1
LED2
D
VBAT VREG
+
OSC
LED TERMINAL
Over Voltage Protect
ISET
Resistor driver
ISET
Current Driver
LED3
LED4
PIN
GND
GND
GND TEST
G
Fig.23 Block diagram
●Pin
assignment table
PIN Name
SENSN
GND
VDET
N.C.
N.C.
ISET
TEST
N.C.
LED4
LED3
N.C.
LED2
LED1
N.C.
EN1
N.C.
EN2
N.C.
VBAT
VREG
PWM
N.C.
GND
N.C.
VREG
SW
SENSP
GND
In/Out
In
-
In
-
-
In
In
-
In
In
-
In
In
-
In
-
In
-
In
Out
In
-
-
-
Out
Out
In
-
PIN number
BD6066GU
A1
A2
C3
-
-
A3
A4
-
A5
B5
-
C5
D5
-
E5
-
E3
-
E4
E2
E1
-
D1
-
-
C1
B1
-
BD6066EKN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
GND
Fig.24 I/O equivalent circuit diagram
Function
- Side Current sense terminal
Detect input for SBD open and OVP
No connect pin
No connect pin
Resistor connection for LED current setting
TEST input (Pull down 100kΩ to GND)
No connect pin
Current sink for LED4
Current sink for LED3
No connect pin
Current sink for LED2
Current sink for LED1
No connect pin
Enable input 1
No connect pin
Enable input 2
No connect pin
Battery input
Regulator output / Internal power-supply
PWM input
No connect pin
GND
No connect pin
Regulator output / Internal power-supply
Switching Tr drive terminal
+ Side Current sense terminal
GND
Terminal equivalent
circuit diagram
A
B
C
-
-
A
G
-
C
C
-
C
C
-
E
-
E
-
C
D
F
-
B
-
D
G
G
B
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
5/15
2011.06 - Rev.B
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
