Macroblock
Features
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16 constant-current output channels
Preliminary Datasheet
All-Ways-On
TM
MBI1816
6
Constant-Current LED Driver
Constant output current invariant to load voltage change
Excellent output current accuracy:
between channels: <±3% (max.), and
between ICs: <±6% (max.)
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Output current adjusted through an external resistor
Constant output current range: 5-90 mA
Fast response of output current, OE (min.): 10μs
Schmitt trigger input
5V supply voltage
Package Type: TSSOP20 with thermal pad
Current Accuracy
Between Channels
<
±3%
Between ICs
<
±6%
CT: TSSOP20-173-0.65
Conditions
I
OUT
= 10 ~ 60 mA
Product Description
MBI1816 is an instant On/Off LED driver for lighting applications and exploits PrecisionDrive™ technology to enhance
its output characteristics. At MBI1816 output stage, sixteen regulated current ports are designed to provide uniform and
constant current sinks for driving LEDs within a large range of V
F
variations.
MBI1816 provides users 16-channel constant current ports to match LEDs with equal current. Users may adjust the
output current from 5 mA to 90 mA through an external resistor, R
ext
, which gives users flexibility in controlling the light
intensity of LEDs. In addition, users can adjust device brightness via OE pin. The duty cycle of OE can decide the
brightness intensity from 0% to 100%. MBI1816 guarantees to endure maximum 17V at the output ports.
Additionally, to ensure the system reliability, MBI1816 is provided in the TSSOP20 with thermal pad for dramatically
increased power dissipation capability. As a result, a large amount of current can be handled safely in one package.
Applications
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Automotive Interior Lighting
Channel Letter
Decoration Lighting
©Macroblock,
Inc. 2004
Floor 6-4, No.18, Pu-Ting Rd., Hsinchu, Taiwan 30077, ROC.
TEL: +886-3-579-0068, FAX: +886-3-579-7534 E-mail:
info@mblock.com.tw
-1-
November 2004, V1.00
MBI1816
Typical Application Circuit
16-Channel Constant-Current LED Driver
Figure 1
Block Diagram
OUT0
OUT1
OUT14 OUT15
R-EXT
VDD
I
O
Regulator
OE
16 switches
Terminal Description
Pin Name
GND
Function
Ground terminal for control logic and current
sink
Pin Configuration
OUT0 ~ OUT15 Constant current output terminals
Output enable terminal
When OE (active) low, the output drivers
are enabled; when OE high, all output
drivers are turned OFF (blanked).
Terminal used to connect an external
resistor (R
ext
) for setting up output current for
all output channels
5V supply voltage terminal
OE
R-EXT
VDD
MBI1816
-2-
November 2004, V1.00
MBI1816
Maximum Ratings
Characteristic
Supply Voltage
Input Voltage
Output Current
Output Voltage
GND Terminal Current
Power Dissipation*
(On PCB, Ta=25°C)
Thermal Resistance*
(Under good thermal system)
Thermal Resistance*
(On PCB, Ta=25°C)
Operating Temperature
Storage Temperature
TSSOP20
16-Channel Constant-Current LED Driver
Symbol
V
DD
V
IN
I
OUT
V
DS
I
GND
P
D
Rating
0~7.0
-0.4~V
DD
+ 0.4
90
-0.5~+17.0
1440
0.85
31.99**
Unit
V
V
mA
V
mA
W
R
th(j-a)
117
T
opr
T
stg
-40~+85
-55~+150
°C/W
°C
°C
*Users must notice that the power dissipation (almost equaling to I
OUT
x V
DS
) should be within the Safe Operation Area
shown in Figure 6.
** Good thermal system design can ensure that the heat management of the total system (storage temperature and
operating temperature) maintains MBI1804 within the defined temperature limits (R
th(j-a)
= 31.99°C/W).
-3-
November 2004, V1.00
MBI1816
Electrical Characteristics
Characteristic
Supply Voltage
Output Voltage
Output Current
Input Voltage
“H”
level
“L”
level
Symbol
V
DD
V
DS
I
OUT
V
IH
V
IL
I
OH
I
OUT1
dI
OUT1
I
OUT2
dI
OUT2
%/dV
DS
%/dV
DD
R
IN
(up)
I
DD
(off) 1
“OFF”
Supply
Current
“ON”
I
DD
(off) 2
I
DD
(off) 3
I
DD
(on) 1
I
DD
(on) 2
16-Channel Constant-Current LED Driver
Condition
-
OUT0 ~ OUT15
DC Test Circuit
Ta= -40~85ºC
Ta= -40~85ºC
V
OH
= 17.0V
V
DS
= 0.6V
I
OL
= 25mA
V
DS
= 0.6V
V
DS
= 0.8V
I
OL
= 50mA
V
DS
= 0.8V
R
ext
= 720
Ω
R
ext
= 720
Ω
R
ext
= 360
Ω
R
ext
= 360
Ω
Min.
4.5
-
5
0.7*V
DD
GND
-
-
-
-
-
-
-
250
= Off
= Off
= Off
= On
= On
-
-
-
-
-
Typ.
5.0
-
-
-
-
-
25
±1
50
±1
±0.1
±1
500
6
6
6
9
10
Max.
5.5
17.0
90
V
DD
0.3*V
DD
0.5
-
±3
-
±3
-
-
800
8
8
8
11
12
Unit
V
V
mA
V
V
μA
mA
%
mA
%
%/V
%/V
KΩ
Output Leakage Current
Output Current 1
Current Skew
Output Current 2
Current Skew
Output Current vs.
Output Voltage Regulation
Output Current vs.
Supply Voltage Regulation
Pull-up Resistor
V
DS
within 1.0V and 3.0V
V
DD
within 4.5V and 5.5V
OE
R
ext
= Open,
R
ext
= 720
Ω,
R
ext
= 360
Ω,
R
ext
= 720
Ω,
R
ext
= 360
Ω,
OUT0
~
OUT15
OUT0
~
OUT15
OUT0
~
OUT15
OUT0
~
OUT15
OUT0
~
OUT15
mA
Test Circuit for Electrical Characteristics
Figure 2
-4-
November 2004, V1.00
MBI1816
Switching Characteristics
Characteristic
Propagation Delay Time
(“L” to
“H”)
Propagation Delay Time
(“H” to
“L”)
Pulse Width
OE - OUTn
OE - OUTn
OE
16-Channel Constant-Current LED Driver
Symbol
t
pLH
t
pHL
t
w(OE)
t
or
t
of
Condition
V
DD
= 5.0 V
V
DS
= 0.8 V- 1.0V
V
IH
= V
DD
V
IL
= GND
R
ext
= 300
Ω
V
L
= 4.0 V
R
L
= 52
Ω
C
L
= 10 pF
Min.
0.08
0.08
10
-
-
Typ.
-
-
-
190
50
Max.
8.2
8.2
-
250
150
Unit
μs
μs
μs
ns
ns
Output Rise Time of Vout (turn off)
Output Fall Time of Vout (turn on)
Test Circuit for Switching Characteristics
Figure 3
Application Information
Constant Current
In LED lighting applications, MBI1816 provides nearly no variations in current from channel to channel and from IC to
IC. This can be achieved by:
1) The maximum current variation between channels is less than
±3%,
and that between ICs is less than
±6%.
2) In addition, the current characteristic of output stage is flat and users can refer to the figure as shown below. The
output current can be kept constant regardless of the variations of LED forward voltages (V
F
). This performs as a
perfection of load regulation.
I
OUT
(mA)
100
90
80
70
60
50
40
30
20
10
0
0.0
I
OUT
vs. V
DS
@ Various Rext
Rext=200
Ω
Rext=298
Ω
Rext=360
Ω
Rext=725
Ω
Rext=1829
Ω
Rext=3694
Ω
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
V
DS
(V)
Figure 4
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November 2004, V1.00
