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Features
Advance Information
MBI5025
16-bit Constant Current LED Sink Driver
MBI5025CN/CNS MBI5016CNS
* 16 constant-current output channels * Constant output current invariant to load voltage change Constant output current range: 3-50 mA * Excellent output current accuracy: between channels: 3% (max.), and between ICs: 6% (max.) * Output current adjusted through an external resistor * Fast response of output current, OE (min.): 400 ns * 25MHz clock frequency * Schmitt trigger input * 3.3V / 5V supply voltage
CN: P-DIP24-300-2.54 CNS: SDIP24-300-1.78
MBI5016CF MBI5025CD/CF
CD: SOP24-300-1.27 CF: SOP24-300-1.00
MBI5016CP MBI5025CP
SSOP24-P-150-0.64
Current Accuracy Between Channels Between ICs < 3% < 6%
Conditions IOUT = 3 mA ~ 35 mA
Product Description
MBI5025 is designed for LED displays. As an enhancement of its predecessor, MBI5016, MBI5025 exploits PrecisionDriveTM technology to enhance its output characteristics. MBI5025 contains a serial buffer and data latches which convert serial input data into parallel output format. At MBI5025 output stage, sixteen regulated current ports are designed to provide uniform and constant current sinks for driving LEDs within a large range of Vf variations. MBI5025 provides users with great flexibility and device performance while using MBI5025 in their system design for LED display applications, e.g. LED panels. Users may adjust the output current from 3 mA to 35 mA through an external resistor, R ext, which gives users flexibility in controlling the light intensity of LEDs. MBI5025 guarantees to endure maximum 17V at the output port. The high clock frequency, 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-
MBI5025
Block Diagram
OUT0
16-bit Constant Current LED Sink Driver
OUT1
OUT14 OUT15
R-EXT
VDD
IO Regulator
OE
16-bit Output Driver 16
LE
16-bit Output Latch 16 16-bit Shift Register SDO
GND
SDI CLK
Terminal Description
Pin No.
1 2 3
Pin Configuration
Function
GND 1 SDI 2 CLK 3 LE 4 OUT0 5 OUT1 6 OUT2 7 OUT3 8 OUT4 9 OUT5 10 OUT6 11 OUT7 12 24 23 22 21 20 19 18 17 16 15 14 13 VDD R-EXT SDO OE OUT15 OUT14 OUT13 OUT12 OUT11 OUT10 OUT9 OUT8
Pin Name
GND SDI CLK
Ground terminal for control logic and current sink 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 output latch when LE is high. The data is latched when LE goes low.
5~20
OUT0 ~ OUT15 Constant current output terminals Output enable terminal
21
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 3.5V / 5V supply voltage terminal
22
SDO
23 24
R-EXT VDD
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January 2004, V0.9
MBI5025
16-bit Constant Current LED Sink Driver
Equivalent Circuits of Inputs and Outputs
OE terminal
VDD
LE terminal
VDD
IN
IN
CLK, SDI terminal
VDD
SDO terminal
VDD
IN
OUT
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January 2004, V0.9
MBI5025
Timing Diagram
N=0 1 2 3 4 5 6 7
16-bit Constant Current LED Sink Driver
8
9
10
11
12
13
14
15
CLK SDI
LE
OE
OFF
OUT0 OUT1 OUT2 OUT3
ON OFF ON OFF ON OFF ON
OFF
OUT15
ON
SDO
: don't care
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 OUT0 ... OUT 7 ... OUT15 Dn ..... Dn - 7 .... Dn - 15 No Change Dn + 2 .... Dn - 5 .... Dn - 13 Dn + 2 .... Dn - 5 .... Dn - 13 Off SDO Dn-15 Dn-14 Dn-13 Dn-13 Dn-13
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January 2004, V0.9
MBI5025
Maximum Ratings
Characteristic Supply Voltage Input Voltage Output Current Output Voltage Clock Frequency GND Terminal Current Operating Temperature Storage Temperature CN - type CNS - type Thermal Resistance (On PCB, Ta=25C) CD- type CF - type CP - type
16-bit Constant Current LED Sink Driver
Symbol VDD VIN IOUT VDS FCLK IGND Topr Tstg Rating 0~7.0 -0.4~VDD + 0.4 +50 -0.5~+20.0 25 1440 -40~+85 -55~+150 53.82 66.74 Rth(j-a) 49.81 59.01 72.43 C/W Unit V V mA V MHz mA C C
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January 2004, V0.9
MBI5025
16-bit Constant Current LED Sink Driver
Recommended Operating Conditions
Characteristic Supply Voltage Symbol VDD Condition 3.0 Output Voltage VDS IOUT Output Current IOH IOL VIH Input Voltage VIL LE Pulse Width CLK Pulse Width OE Pulse Width Setup Time for SDI Hold Time for SDI Setup Time for LE Hold Time for LE Clock Frequency tw(L) tw(CLK) tw(OE) VDD=4.5~5.5V tsu(D) th(D) tsu(L) th(L) FCLK Cascade Operation 5 10 15 15 25.0 ns ns ns ns MHz OUT0 ~ OUT15 DC Test Circuit SDO SDO CLK, OE , LE and SDI CLK, OE , LE and SDI 3 0.8VDD -0.3 40 20 400 3.3 3.6 17.0 35 -1.0 1.0 VDD+0.3 0.3VDD V mA mA mA V V ns ns ns Min. 4.5 Typ. 5.0 Max. 5.5 V Unit
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January 2004, V0.9
MBI5025
Electrical Characteristics
Characteristic Input Voltage "H" level "L" level Symbol VIH VIL IOH VOL VOH IOUT1
16-bit Constant Current LED Sink Driver
Condition Ta = -40~85C Ta = -40~85C VOH=17.0V IOL=+1.0mA IOH=-1.0mA VDS=0.5V IOL=15mA VDS=0.5V VDS=0.8V IOL=30mA VDS=0.8V Rext=1260 Rext=1260 Rext=620 Rext=620
Min. 0.8VDD GND 4.6 -
Typ. 15.0 1
Max. VDD 0.3VDD 0.5 0.4 3
Unit V V A V V mA
Output Leakage Current Output Voltage
SDO
Output Current 1
Current Skew
dIOUT1 IOUT2
-
%
Output Current 2
Current Skew
-
30.0 1 0.1 1 500 500 9 10 11 10 11
3 800 800 -
mA
dIOUT2 %/dVDS %/dVDD RIN(up) RIN(down) IDD(off) 1
250 250
% %/V %/V K K
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 LE Rext=Open, Rext=1260 , Rext=620 , Rext=1260 , Rext=620 ,
OUT0 ~ OUT15 OUT0 ~ OUT15 OUT0 ~ OUT15 OUT0 ~ OUT15 OUT0 ~ OUT15
=Off =Off =Off =On =On
-
"OFF" Supply Current "ON"
IDD(off) 2 IDD(off) 3 IDD(on) 1 IDD(on) 2
mA
Test Circuit for Electrical Characteristics
IDD
VDD OE
IOUT
OUT0
IIH,IIL
CLK LE SDI R - EXT GND
. . . .
OUT15
SDO
VIH, VIL
Iref
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January 2004, V0.9
MBI5025
Switching Characteristics
Characteristic CLK - OUTn Propagation Delay Time ("L" to "H") LE - OUTn OE - OUTn CLK - SDO CLK - OUTn Propagation Delay Time ("H" to "L") LE - OUTn OE - OUTn CLK - SDO CLK Pulse Width LE OE Hold Time for LE Setup Time for LE Maximum CLK Rise Time Maximum CLK Fall Time Output Rise Time of Iout Output Fall Time of Iout
16-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) tr** tf** tor tof
Condition
Min. 15
Typ. 50 50 20 20 100 100 50 20 70 40
Max. 100 100 100 150 150 150 500 500 200 120
Unit ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns
VDD=5.0 V VDS=0.8 V VIH=VDD VIL=GND Rext=300 VL=4.0 V RL=52 CL=10 pF
15 20 20 400 5 5 -
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
. . .
OUT15
RL
SDO
CL
VL
Logic input waveform VIH = 5V VIL = 0V tr = tf = 10 ns
Iref
CL
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January 2004, V0.9
MBI5025
Timing Waveform
tW(CLK)
16-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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January 2004, V0.9
MBI5025
Application Information Constant Current
16-bit Constant Current LED Sink Driver
To design LED displays, MBI5025 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 (Vf). This performs as a perfection of load regulation.
Adjusting Output Current
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.
60 50 Iout (mA) 40 30 20 10 0 0 500 1000 Rext () 1500 2000 2500
VDS = 1.0V
Resistance of the external resistor, Rext, in Also, the output current can be calculated from the equation: VR-EXT = 1.26VIOUT = (VR-EXT / 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 30mA at 620 and 15mA at 1260.
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January 2004, V0.9
MBI5025
Package Power Dissipation (PD)
16-bit Constant Current LED Sink Driver
The maximum allowable package power dissipation is determined as P D(max) = (Tj - Ta) / Rth(j-a). When 16 output channels are turned on simultaneously, the actual package power dissipation is PD(act) = (IDD x VDD) + (IOUT x Duty x VDS x 16). Therefore, to keep P D(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 / 16, where Tj = 150C.
Load Supply Voltage (VLED)
MBI5025 are designed to operate with VDS ranging from 0.4V to 0.8V (IOUT=5~35mA) considering the package power dissipating limits. VDS may be higher enough to make PD(act) > PD(max) when VLED = 5V and VDS = VLED - Vf, in which 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
MBI5025
MBI5025
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January 2004, V0.9
MBI5025
Package Outline
16-bit Constant Current LED Sink Driver
MBI5025CNS Outline Drawing
MBI5025CD Outline Drawing
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January 2004, V0.9
MBI5025
16-bit Constant Current LED Sink Driver
MBI5025CF Outline Drawing
MBI5025CP Outline Drawing
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January 2004, V0.9

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