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Macroblock
Features
l l l 8 constant-current output channels
Preliminary Datasheet
MBI5168
8-bit Constant Current LED Sink Driver
MBI5168CN MBI5168CN
MBI5001CN
Constant output current invariant to load voltage change Excellent output current accuracy: between channels: < 3% (max.), and between ICs: < 6% (max.)
P-DIP16-300-2.54 Weight1.02g
MBI5001CD
MBI5168CD MBI5168CD
l l l
Output current adjusted through an external resistor Constant output current range: 5 -120 mA Fast response of output current, OE (min.): 200 ns @Iout < 60mA OE (min.): 400 ns @Iout = 60~100mA
SOP16-150-1.27 Weight0.13g
MBI5168CDW
MBI5001CD
l l l
25MHz clock frequency Schmitt trigger input 5V supply voltage
MBI5168CP
SOP16-300-1.27 Weight0.37g
MBI5168CP
SSOP16-150-0.64 Weight0.07g
Current Accuracy Between Channels Between ICs < 3% < 6%
Conditions IOUT = 10 ~ 100 mA, VDS = 0.8V
Product Description
MBI5168 is designed for LED display applications. As an enhancement of its predecessor, MBI5001, MBI5168 exploits PrecisionDriveTM technology to enhance its output characteristics. MBI5168 contains a serial buffer and data latches, which convert serial input data into parallel output format. At MBI5168 output stage, eight regulated current ports are designed to provide uniform and constant current sinks for driving LEDs within a large range of Vf variations. MBI5168 provides users with great flexibility and device performance while using MBI5168 in their system design for LED display applications, e.g. LED panels. Users may adjust the output current from 5 mA to 120 mA through an external resistor Rext, which gives users flexibility in controlling the light intensity of LEDs. MBI5168 guarantees to endure maximum 17V at the output ports. The high clock frequency up to 25 MHz also satisfies the system requirements of high volume data transmission.
(c)Macroblock, Inc. 2003 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-
MBI5168
Terminal Description
Pin No. 1 2 3 Pin Name GND SDI CLK
8-bit Constant Current LED Sink Driver
Pin Description
Function Ground terminal for control logic and current sinks Serial-data input to the shift register Clock input terminal for data shift on rising edge Data strobe input terminal
4
LE
Serial data is transferred to the respective latch when LE is high. The data is latched when LE goes low. Constant current output terminals Output enable terminal
GND SDI CLK LE OUT 0 OUT1 OUT2 OUT3
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
VDD R-EXT SDO OE OUT7 OUT6 OUT5 OUT 4
5-12
OUT0 ~ OUT7
13
OE
When (active) low, the output drivers are enabled; when high, all output drivers are turned OFF (blanked). Serial-data output to the following SDI of next driver IC Input terminal used to connect an external resistor for setting up output current for all output channels 5V supply voltage terminal
14
SDO
15 16
R-EXT VDD
Block Diagram
OUT0 OUT1 OUT6 OUT7
R-EXT
VDD
IO Regulator
OE
8-Bit Output Driver 8
LE
8-Bit Output Latch
8 8-Bit Shift Register SDO
GND
SDI CLK
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September 2003, V0.3
MBI5168
8-bit Constant Current LED Sink Driver
Equivalent Circuits of Inputs and Outputs
OE terminal
VDD
LE terminal
VDD
OE
LE
CLK, SDI terminal
VDD
SDO terminal
VDD
CLK, SDI
SDO
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September 2003, V0.3
MBI5168
Timing Diagram
N= 0 1 2 3 4 5
8-bit Constant Current LED Sink Driver
6
7
CLK SDI
LE OE
OFF ON OFF ON OFF ON OFF
OUT0 OUT1 OUT2
OUT3
ON
OFF
OUT6
ON OFF
OUT7
ON
SDO
: don't care
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September 2003, V0.3
MBI5168
Truth Table
CLK LE H L H X X OE L L L L H SDI Dn Dn+1 Dn+2 Dn+3 Dn+3
8-bit Constant Current LED Sink Driver
OUT0 ... OUT5 ... OUT 7 Dn ..... Dn - 5 .... Dn - 7 No Change Dn + 2 .... Dn - 3 .... Dn - 5 Dn + 2 .... Dn - 3 .... Dn - 5 Off
SDO Dn-7 Dn-6 Dn-5 Dn-5 Dn-5
Maximum Ratings
Characteristic Supply Voltage Input Voltage Output Current Output Voltage Clock Frequency GND Terminal Current CN - type Power Dissipation (On PCB, Ta=25C) CD - type CDW - type CP - type CN - type Thermal Resistance (On PCB, Ta=25C) CD - type CDW - type CP - type Operating Temperature Storage Temperature Topr Tstg Rth(j-a) PD Symbol VDD VIN IOUT VDS FCLK IGND Rating 0 ~ 7.0 -0.4 ~ VDD+0.4 +120 -0.5 ~ +20.0 25 1000 2.03 1.46 2.03 1.32 61.65 85.82 61.63 94.91 -40 ~ +85 -55 ~ +150 C C C/W W Unit V V mA V MHz mA
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September 2003, V0.3
MBI5168
Electrical Characteristics
Characteristic Supply Voltage Output Voltage Symbol VDD VDS IOUT Output Current IOH IOL Input Voltage "H" level "L" level VIH VIL VOL VOH IOUT1 dIOUT1 IOUT2 dIOUT2 IOUT3 dIOUT3 %/dVDS %/dVDD RIN(up)
8-bit Constant Current LED Sink Driver
Condition OUT0 ~ OUT7 Test Circuit for Electrical Characteristics SDO SDO Ta = -40~85C Ta = -40~85C VOH = 17.0V and channel off IOL = +1.0mA IOH = -1.0mA VDS = 0.5V IOUT = 25.26mA VDS 0.5V VDS = 0.6V IOUT = 50.52mA VDS 0.6V VDS = 0.8V IOUT = 101.0mA VDS 0.8V Rex t = 744 Rext = 744 Rext = 372 Rext = 372 Rext = 186 Rext = 186
Min. 4.5 5 0.8VDD GND 4.6 250 250
Typ. 5.0 25.26 1 50.52 1 101.0 1 0.1 1 500 500 3.25 5 6.8 10.5 5 6.8 10.5
Max. 5.5 17.0 120 -1.0 1.0 VDD 0.3VDD 0.5 0.4 3 3 3 800 800 -
Unit V V mA mA mA V V A V V mA % mA % mA % %/V %/V K K
Output Leakage Current Output Voltage Output Current 1 Current Skew (between channels) Output Current 2
Current Skew SDO
(between channels) Output Current 3
Current Skew
(between channels) Output Current vs. Output Voltage Regulation Output Current vs. Supply Voltage Regulation Pull-up Resistor Pull-down Resistor
VDS within 1.0V and 3.0V VDD within 4.5V and 5.5V OE
OUT0 ~ OUT7 OUT0 ~ OUT7 OUT0 ~ OUT7 OUT0 ~ OUT7 OUT0 ~ OUT7 OUT0 ~ OUT7 OUT0 ~ OUT7
RIN(down) LE IDD(off) 1 Rext = Open, "OFF" IDD(off) 2 Rext = 744 , IDD(off) 3 Rext = 372 , IDD(off) 4 Rext = 186 , IDD(on) 1 Rext = 744 , "ON" IDD(on) 2 Rext = 372 , IDD(on) 3 Rext = 186 , = Off = Off = Off = Off = On = On = On
-
Supply Current
mA
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September 2003, V0.3
MBI5168
8-bit Constant Current LED Sink Driver
Test Circuit for Electrical Characteristics
IDD
VDD OE
IOUT
OUT0
IIH,IIL
CLK LE SDI R - EXT GND
. . . .
OUT7
SDO
VIH, VIL
Iref
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September 2003, V0.3
MBI5168
Switching Characteristics
Characteristic CLK - OUTn Propagation Delay LE - OUTn Time ("L" to "H") OE - OUTn CLK - SDO CLK - OUTn Propagation Delay LE - OUTn Time ("H" to "L") OE - OUTn CLK - SDO CLK Pulse Width LE OE (@Iout < 60mA) Hold Time for LE Setup Time for LE Hold Time for SDI Setup Time for SDI Maximum CLK Rise Time Maximum CLK Fall Time Output Rise Time of Vout (turn off) Output Fall Time of Vout (turn on) Clock Frequency
8-bit Constant Current LED Sink Driver
Symbol tpLH1 tpLH2 tpLH3 tpLH tpHL1 tpHL2 tpHL3 tpHL tw(CLK) tw(L) tw(OE) th(L) tsu(L) th(D) tsu(D) tr** tf** tor tof FCLK
Condition
Min. 15 -
Typ. 50 50 20 20 100 100 50 20 40 70 -
Max. 100 100 100 150 150 150 500 500 120 200 25.0
Unit ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns MHz
Test Circuit for Switching Characteristics
15
VDD = 5.0 V VDS = 0.8 V VIH = VDD VIL = GND Rext = 372 VL = 4.0 V RL = 64 CL = 10 pF
20 20 200 10 5 10 5 -
Cascade Operation
-
**If the devices are connected in cascade and tr or tf is large, it may be critical to achieve the timing required for data transfer between two cascaded devices.
Test Circuit for Switching Characteristics
IDD
IOUT
VIH, VIL
OE VDD OUT0
Function Generator
CLK LE SDI R - EXT GND
. . .
OUT7
RL
SDO
CL
VL
Logic input waveform VIH = 5V VIL = 0V tr = tf = 10 ns
Iref
CL
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September 2003, V0.3
MBI5168
Timing Waveform
tW(CLK)
8-bit Constant Current LED Sink Driver
CLK
50%
50%
50%
tsu(D)
th(D)
50%
SDI
50%
SDO
tpLH, tpHL
50%
tW(L)
50% 50%
LE
th(L) OE
tsu(L)
LOW = OUTPUTS ENABLED HIGH = OUTPUT OFF
OUTn tpLH1, tpHL1 tpLH2, tpHL2
50%
LOW = OUTPUT ON
tW(OE) OE
50% 50%
tpHL3
90% 50% 10%
tpLH3
90% 50% 10%
OUTn
tof
tor
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September 2003, V0.3
MBI5168
Application Information Constant Current
8-bit Constant Current LED Sink Driver
In LED display application, MBI5168 provides nearly no variations in current from channel to channel and from IC to IC. This can be achieved by: 1) While IOUT 100mA, the maximum current variation between channels is less than 3%, and that between ICs is less than 6%. 2) In addition, the characteristics curve of output stage in the saturation region is flat and users can refer to the figure as shown below. Thus, the output current can be kept constant regardless of the variations of LED forward voltages (Vf).
Iout v.s.Vout for various Rext
140 120 100
Iout (mA)
80 60 40 20 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5
VDS (V)
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September 2003, V0.3
MBI5168
Adjusting Output Current
8-bit Constant Current LED Sink Driver
The output current of each channel (IOUT) is set by an external resistor, Rext. The relationship between Iout and Rext is shown in the following figure.
120 100 80 60 40 20 0 0 500 1000 1500 2000 2500 3000 3500 4000
IOUT (mA)
VDS = 1.0V
Rext ()
Resistance of the external resistor, Rext, in Also, the output current can be calculated from the equation: VR-EXT = 1.253Volt Iref = Vrext / Rext if another end of the external resistor Rext is connected to ground.
IOUT = Iref x 15 = 1.253Volt / Rext x 15. where Rext is the resistance of the external resistor connected to R-EXT terminal and VR-EXT is the voltage of R-EXT terminal. The magnitude of current (as a function of Rext) is around 50.52mA at 372 and 25.26mA at 744.
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September 2003, V0.3
MBI5168
Package Power Dissipation (PD)
8-bit Constant Current LED Sink Driver
The maximum allowable package power dissipation is determined as PD(max) = (Tj - Ta) / Rth(j-a). When 8 output channels are turned on simultaneously, the actual package power dissipation is PD(act) = (IDD x VDD) + (IOUT x Duty x VDS x 8). Therefore, to keep PD(act) PD(max), the allowable maximum output current as a function of duty cycle is: IOUT = { [ (Tj - Ta) / Rth(j-a) ] - (IDD x VDD) } / VDS / Duty / 8, where Tj = 150C.
Iout vs. Duty Cycle at Rth = 61.65 (C/W) 120 110 100 90 80 Iout (mA) Iout (mA) 70 60 50 40 30 20 10 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100% 0 120 110 100 90 80 70 60 50 40 30 20 10 5% 10% 15% 20%
Iout vs. Duty Cycle at Rth = 85.82 ( C/W)
25%
30%
35%
40%
45%
50%
55%
60%
65%
70%
75%
80%
85%
90%
95% 95%
Duty Cycle
Duty Cycle
CN Device Type
CD Device Type
Iout vs. Duty Cycle at Rth = 61.63 ( C/W) 120 110 100 90 80 Iout (mA) Iout (mA) 70 60 50 40 30 20 10 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100% 0 120 110 100 90 80 70 60 50 40 30 20 10 5% 10% 15% 20%
Iout vs. Duty Cycle at Rth = 94.91 ( C/W)
25%
30%
35%
40%
45%
50%
55%
60%
65%
70%
75%
80%
85%
90%
Duty Cycle
Duty Cycle
CDW Device Type ConditionVDS = 1.0V8 output channels active Ta is listed in the below legends. Device Type Rth(j-a)(C/W) Note CN 61.65 25 CD 85.82 55 CDW 61.63 85 CP 94.91
CP Device Type
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September 2003, V0.3
100%
0
100%
0
MBI5168
8-bit Constant Current LED Sink Driver
The maximum power dissipation, PD(max) = (Tj - Ta) / Rth(j-a), decreases as the ambient temperature increases.
Max. Power Dissipation at Various Ambient Temperature
2.50 2.25 2.00 1.75 1.50 1.25 1.00 0.75 0.50 10 20 30 40 50 60 70 80 90
Power Dissipation
CN Type: Rth= 61.65 CD Type: Rth= 85.82 CDW Type: Rth=61.63 CP Type: Rth= 72.43
Ambient Temperature
Load Supply Voltage (VLED)
MBI5168 are designed to operate with VDS ranging from 0.4V to 1.0V considering the package power dissipating limits. VDS may be so high as to make PD(act) > PD(max) under higher VLED , for instance, than 5V, where VDS = VLED - Vf and VLED is the load supply voltage. In this case, it is recommended to use the lowest possible supply voltage or to set an external voltage reducer, VDROP. A voltage reducer lets VDS = (VLED - Vf) - VDROP. Resistors or Zener diode can be used in the applications as shown in the following figures.
VLED VDROP
VLED VDROP
Vf
Vf
VDS
VDS
MBI5168
MBI5168
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September 2003, V0.3
MBI5168
Outline Drawings
8-bit Constant Current LED Sink Driver
MBI5168CN Outline Drawing
MBI5168CD Outline Drawing
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September 2003, V0.3
MBI5168
8-bit Constant Current LED Sink Driver
MBI5168CDW Outline Drawing
MBI5168CP Outline Drawing
MBI5168 Package Information
Device Type CN CD CDW CP Package Type P-DIP16-300-2.54 SOP16-150-1.27 SOP16-300-1.27 SSOP16-150-0.64 Weight(g) 1.02 0.13 0.37 0.07
Note: The unit for the outline drawing is mm. - 15 September 2003, V0.3

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