Macroblock
Features
2 constant-current output channels
Preliminary Datasheet
MBI1802
All-Ways-On
TM
High-Power LED Driver
Constant output current invariant to load voltage change
Maximum output constant current: 360 mA
Thermal protection and report
Output current adjustment
Schmitt trigger input
5V supply voltage
Package type: SOP8 with thermal pad
Current Accuracy
Between Channels
< ±3%
Between ICs
< ±6%
Conditions
I
OUT
= 40mA ~ 360 mA
@ V
DS
= 0.6V
Product Description
MBI1802 is an instant On/Off LED driver for high power LED applications and exploits PrecisionDrive™ and
All-Ways-On™ technology to enhance its output characteristics.
With All-Ways-On™, MBI1802 easily provides users with a consistent current source in their system design. Users
may adjust the output current up to 360 mA through an external resistor, R
ext
, which gives users flexibility in
controlling the light intensity of LEDs. Also, users can precisely adjust LED brightness from 0% to 100% via output
control with Pulse Width Modulation. Alternatively, MBI1802 provides one-step current adjustment to make a
quarter of the output current via enabling the QUAD pin as “High”.
Additionally, to ensure the system reliability, MBI1802 is built with TP (Thermal Protection) function and thermal
pad. The TP function can protect IC from over temperature (165°C) and the thermal pad can enhance the power
dissipation. As a result, a large amount of current can be handled safely in one package.
Applications
High-Flux LED Lighting
Automotive Interior Lighting
Macroblock,
Inc. 2005
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-
January 2005, V1.00
MBI1802
Pin Configuration
GND
R-EXT
QUAD
OUT0
1
2
3
4
Thermal
Pad
All-Ways-On
TM
High-Power LED Driver
8
7
6
5
VDD
OE
ERR
OUT1
MBI1802
Terminal Description
Pin No.
1
Pin Name
GND
Function
Ground terminal for control logic and current
sink
Terminal used to connect an external
resistor(R
ext
) for setting up output current for
all output channels
Set all the output current to 25% of the
pre-set current when QUAD is high.
2
R-EXT
3
4, 5
QUAD
OUT0 ~ OUT1
ERR
Constant current output terminals
Thermal error flag, when junction
temperature is over 165°C, ERR is going to
high.*
Output enable terminal
When OE (active) low, the output drivers
are enabled; when
OE
high, all output
drivers are turned OFF (blanked).
5V supply voltage terminal
Power dissipation terminals with ground
connection*
6
7
OE
8
-
VDD
Thermal Pad
*To eliminate the noise influence, the thermal pad should be connected to GND.
In addition, desired thermal conductivity will be better if the conduction area on PCB connecting to the thermal pad
is large enough.
-3-
January 2005, V1.00
MBI1802
Maximum Ratings
Characteristic
All-Ways-On
TM
High-Power LED Driver
Symbol
Rating
Unit
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
SOP8
V
DD
V
IN
I
OUT
V
DS
I
GND
P
D
0~7.0
-0.4~V
DD
+ 0.4
360*
-0.5~+17.0
720
0.8
33.39**
V
V
mA
V
mA
W
R
th(j-a)
125
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 MBI1802 within the defined temperature limits (R
th(j-a)
= 33.39°C/W).
-4-
January 2005, V1.00
Microcontroller MCU
京公网安备 11010802033920号
EEWORLD
