MBI5016CD

Macroblock 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 MBI5016CPP MBI5025C 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 PrecisionDrive™ 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. ©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 -2- 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 -3- 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 -4- 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=25°C) 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 -5- 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 -6- 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 = -40~85ºC Ta = -40~85ºC 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 Ω Rext=1260 Ω Rext=620 Ω Rext=620 Ω Min. 0.8VDD GND 4.6 - Typ. 15.0 ±1 Max. VDD 0.3VDD 0.5 0.4 ±3 Unit V V μA 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 KΩ KΩ 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 Ω, Rext=620 Ω, Rext=1260 Ω, Rext=620 Ω, 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 -7- 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 Ω VL=4.0 V RL=52 Ω 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 -8- 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 -9- 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 (Ω) 1500 2000 2500 VDS = 1.0V Resistance of the external resistor, Rext, in Ω Also, the output current can be calculated from the equation: VR-EXT = 1.26V；IOUT = (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 620Ω and 15mA at 1260Ω. - 10 - 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 = 150°C. 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 - 11 - January 2004, V0.9 MBI5025 Package Outline 16-bit Constant Current LED Sink Driver MBI5025CNS Outline Drawing MBI5025CD Outline Drawing - 12 - January 2004, V0.9 MBI5025 16-bit Constant Current LED Sink Driver MBI5025CF Outline Drawing MBI5025CP Outline Drawing - 13 - January 2004, V0.9