Datasheet
6-Channel Charge Pump
White LED Driver with 16 Dimming
Steps and 1-wire Serial Interface
BD1206GUL
●General
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
5ch or 6ch parallel LED driver is mounted
16-step LED current adjust function
LED current matching is 5% or less
Driving control via a single-line digital control
interface
Automatic transition charge pump type DC/DC
converter (×1, ×1.5, ×2)
High efficiency achieved (Maximum over 93%)
It transits for the most suitable power operating
by the LED terminal process of the 6th light
when only 5 lights driving
Various protection functions such as output
voltage protection and thermal shutdown circuit
are mounted.
The input external PWM is possible and the
back light control interlocked with the motion
picture is possible.
Package: VCSP50L2 (Thick 0.55mm MAX, Pin
pitch 0.5mm) CSP15pin package
●Typical
Application Circuit (6 light with PWM)
●Key
Specification
Operating power supply voltage range: 2.7V to 5.5V
LED maximum current:
20mA (Typ.)
Oscillator frequency:
0.85MHz(Typ.)
Quiescent Current:
0.1μA (Typ.)
Operating temperature range:
-30℃ to +85℃
●Package
VCSP50L2:
W(Typ.) x D(Typ.) x H (Max.)
2.00mm x 2.00mm x 0.55mm
●Pin
Configuration [Bottom View]
BD1206GUL
Figure 1. Pin Configuration
○Product
structure：Silicon monolithic integrated circuit
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© 2012 ROHM Co., Ltd. All rights reserved.
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○This
product is not designed protection against radioactive rays
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TSZ02201-0G3G0C200020-1-2
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BD1206GUL
●Absolute
Maximum Ratings
(Ta=25ºC)
Parameter
Power supply voltage
Input voltage ( EN , PWMIN )
Power dissipation
Operating temperature range
Storage temperature range
(Note)
Datasheet
Symbol
VMAX
Vdin
Pd
Topr
Tstg
Ratings
7
GND-0.3 to VBAT+0.3
900
-30 to +85
-55 to +150
Unit
V
V
mW
ºC
ºC
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
●Recommended
Operating Rating
(Ta = -30 to 85 C)
Parameter
Operating power supply voltage
Symbol
VBAT
Limits
2.7 to 5.5
Unit
V
●Electrical
Characteristics
(Unless otherwise noted, Ta = +25
o
C, VBAT=3.6V)
Parameter
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
EN = VBAT, PWMIN = VBAT
EN = 0V, PWMIN = 0V
Described in Figure 4.
Described in Figure 4.
Described in Figure 4.
Described in Figure 4.
Described in Figure 4.
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
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
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
x 1.0 Mode
Include LED current (60mA)
x 2.0 Mode
Include LED current (60mA)
Symbol
Limits
Min.
Typ.
Max.
Units
Condition
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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
Datasheet
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
Figure 2. Pin ESD Type
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TSZ02201-0G3G0C200020-1-2
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BD1206GUL
●Block
Diagram
Datasheet
C1N
C1P
C2N
VBAT
×1, ×1.5, ×2
Charge pump
C2P
VOUT
Over Voltage
Protect
Charge Pump
Mode Control
EN
Enable/
Brightness
Control
OSC
Vout Control
TSD
LED1
LED2
LED3
LED4
LED5
PWMIN
4
LED6 DET
LED6
Current
DAC
GND
Figure 3. Block Diagram
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TSZ02201-0G3G0C200020-1-2
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BD1206GUL
Datasheet
●Separate
Function Description
(1) LED driver
a) Register access control protocol
LED current is controlled by only EN terminal. It is possible to access the register inside of this chip by using the
protocol below. Accessing the registers with using this protocol operates LED driver ON/OFF and selecting the mode.
Moreover, MAX current can be outputted without Clock input to EN terminal by holding H zone of fixed time after EN
terminal starting.
< When setting current level >
T
acc
T
LO
T
HI
T
LAT
T
OFF
T
pulse
EN
1
2
n-1
n
(N≦16)
LED Current Setting
0
(Notes) T
accMIN
<
T
pulse
<
n
T
accMAX
Please input a pulse on this condition
0
< When starting by MAX setup >
T
accMAX
T
OFF
EN
LED Current Setting
0
１
0
Figure 4. Register access protocol
T
acc
T
LAT
T
LAT
T
LAT
T
LAT
EN
16pulse
15pulse
14pulse
13pulse
1mA
0.5mA
LED Current
OFF
0.125mA
0.25mA
Figure 5. Slope control example
(Note)
・In
the case of N > 16, BD1206GUL selects the mode of N = 16.
・LED
current is changed by the pulse of EN pin.
Be careful to noise of EN signal.
・Reset
BD1206GUL when the set is unusual. (Keep EN=L over Toff time.)
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