LED Drivers for LCD Backlights
Backlight LED Driver
for Small LCD Panels (Charge Pump Type)
BD1206GUL
No.10040EAT08
●Description
BD1206GUL is 5ch or 6ch parallel LED driver for the portable instruments.
This IC is equipped with an automatic transition charge pump and 16-step LED drivers. Hence this IC realizes high efficiency
and high accuracy drive of LEDs. Additionally, this IC can synchronize LED drive with external PWM signal. This IC is best
suited to turn on white LEDs that require high-accuracy LED brightness control.
●Features
1) 5ch or 6ch parallel LED driver is mounted
2) 16-step LED current adjust function
3) LED current matching is 5% or less
4) Driving control via a single-line digital control interface
5) Automatic transition charge pump type DC/DC converter (×1, ×1.5, ×2)
6) High efficiency achieved (Maximum over 93%)
7) It transits for the most suitable power operating by the LED terminal process of the 6th light when only 5 lights driving
8) Various protection functions such as output voltage protection and thermal shutdown circuit are mounted.
9) The input external PWM is possible and the back light control interlocked with the motion picture is possible.
10) Package: VCSP50L2 (Thick 0.55mm MAX, Pin pitch 0.5mm) CSP15pin package
●Absolute
Maximum Ratings (Ta=25ºC)
Parameter
Power supply voltage
Input voltage ( EN , PWMIN )
Power dissipation
Operating temperature range
Storage temperature range
Symbol
VMAX
Vdin
Pd
Topr
Tstg
Ratings
7
GND-0.3 ~ VBAT+0.3
900
-30 ~ +85
-55 ~ +150
Unit
V
V
mW
ºC
ºC
(Note) Power dissipation deleting is 7.2mW/ ºC, when it’s used in over 25 ºC.(It’s deleting is on the board that is ROHM’s standard)
Dissipation by LSI should not exceed tolerance level of Pd.
o
●Operating
Conditions (Ta = -30 ~ 85 C)
Parameter
Operating power supply voltage
Symbol
VBAT
Limits
2.7 ~ 5.5
Unit
V
*This chip is not designed to protect itself against radioactive rays.
*This material may be changed on its way to designing.
*This material is not the official specification.
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© 2010 ROHM Co., Ltd. All rights reserved.
1/12
2010.02 - Rev.A
BD1206GUL
●Electrical
Characteristics (Unless otherwise noted, Ta = +25
o
C, VBAT=3.6V)
Limits
Parameter
Symbol
Units
Min.
Typ.
Max.
Current Consumption
Quiescent Current
Current Consumption1
Current Consumption2
Charge Pump
Oscillator frequency
Current Source
LED maximum current
LED current accuracy
LED current matching
LED control voltage
Logic control terminal
Low threshold voltage
High threshold voltage
High level Input current
Low level Input current
Minimum EN High time
Minimum EN Low time
EN Off Timeout
Latch time
Access available time
V
IL
V
IH
I
IH
I
IL
T
HI
T
LO
T
OFF
T
LAT
Tacc
-
1.4
-
-1
0.05
0.3
1
1
1
-
-
0
0
-
-
-
-
-
0.4
-
1
-
100
100
-
-
5
V
V
μA
μA
μs
μs
ms
ms
ms
EN, PWMIN
EN, PWMIN
I
LED-max
I
LED-diff
I
LED-match
V
LED
18
-
-
-
20
-
0.5
0.15
22
10.0
5.0
0.25
mA
%
%
V
VBAT≥3.2V
f
OSC
0.56
0.85
1.14
MHz
I
q
I
dd1
I
dd2
-
-
-
0.1
62
123
1
64
126
μA
mA
mA
EN=0V
Technical Note
Condition
x 1.0 Mode
Include LED current (60mA)
x 2.0 Mode
Include LED current (60mA)
LED current setting is 10.0mA,
LED terminal voltage is 1.0V
LED current setting is 10.0mA,
LED terminal voltage is 1.0V
Minimum voltage from LED1 to LED6
pins
EN = VBAT, PWMIN = VBAT
EN = 0V, PWMIN = 0V
Described in Fig.5
Described in Fig.5
Described in Fig.5
Described in Fig.5
Described in Fig.5
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© 2010 ROHM Co., Ltd. All rights reserved.
2/12
2010.02 - Rev.A
BD1206GUL
●Pin
Descriptions
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Terminal No.
D4
B4
C4
A4
B3
A3
C3
D1
D2
C1
C2
B1
A1
D3
A2
Pin Name
VBAT
C1P
C1N
C2P
C2N
VOUT
EN
LED1
LED2
LED3
LED4
LED5
LED6
PWMIN
GND
In/Out
-
In/Out
In/Out
In/Out
In/Out
Out
In
Out
Out
Out
Out
Out
Out
In
-
Type
A
A
B
A
B
A
C
B
B
B
B
B
A
C
D
Power supply
Function
Technical Note
Flying capacitor pin positive (+) side
Flying capacitor pin negative (-) side
Flying capacitor pin positive (+) side
Flying capacitor pin negative (-) side
Charge pump output
ON/OFF and dimming control
LED current driver output 1
LED current driver output 2
LED current driver output 3
LED current driver output 4
LED current driver output 5
LED current driver output 6
PWM Control
GND
●Pin
ESD Type
Type A
Type B
VBAT
Type C
VBAT
PAD
GND
PAD
GND
PAD
GND
Type D
VBAT
PAD
Fig. 4 Pin ESD Type
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© 2010 ROHM Co., Ltd. All rights reserved.
5/12
2010.02 - Rev.A
MCU
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