MBI5034GP-A

Macroblock Features  MBI5034 Datasheet 16-Channel Constant Current LED Sink Driver with Compulsory Open-circuit Detection and Current Gain 16 constant-current output channels Small Outline Package Constant output current range: 3~45mA - 3-45mA @ 5V supply voltage - 3-30mA @ 3.3V supply voltage  Compulsory LED open-circuit detection - Open-circuit LEDs can be detected - Full panel, data independent - Flicker-free error detection  64-step programmable current gain: from 12.5% to 200%  Excellent output current accuracy, - Between channels: H=4 Whereas Rext is the resistance of the external resistor connected to R-EXT terminal and VR-EXT is its voltage. G is the digital current gain, which is set by the bit 5 to bit 0 of the configuration register. The default value of G is 1. For your information, the output current is about 20mA when Rext=700Ω and 42.5mA when Rext=330Ω if G is set to default value 1. The formula and the setting for G are described in the next section. - 20 - July 2015, VA.00 16-Channel Constant Current LED Sink Driver with Compulsory Open-circuit Detection and Current Gain MBI5034 Current Gain Adjustment Gain Gain 1.938 0.488 1.615 0.406 32 steps 0.312 32 steps 1.246 Default value： 1 0.877 0.218 0.125 0.508 1,1111 (DA4~DA0) 1,1000 1,0000 0,1000 0,0000 1,1111 (DA4~DA0) 1,1000 1,0000 0,1011 0,1000 0,0000 Note: HC=0，Gain range=( 0.488 ~ 0.125 ) Note: HC=1，Gain range=( 1.938 ~ 0.508 ) The 6 bits (bit 5~bit 0) of the configuration register set the gain of output current. As total 6-bit in number, i.e., ranged from 6’b000000 to 6’b111111, these bits allow the user to set the output current gain up to 64 steps. These bits can be further defined inside configuration register as follows: F - E - D - C - B - A - 9 - 8 - 7 - 6 - 5 HC 4 DA4 3 DA3 2 DA2 1 DA1 0 DA0 1. Bit 5 is HC bit. The setting is in low current band when HC=0, and in high current band when HC=1. 2. Bit 4 to bit 0 are DA4~DA0. The relationship between these bits and current gain (G) is: HC=1, D=(65xG-33)/3 HC=0, D=(256xG-32)/3 and D in the above decimal numeration can be converted to its equivalent in binary form by the following equation: D=DA4x24+DA3x23+DA2x22+DA1x21+DA0x20 In other words, these bits can be looked as a floating number with 1-bit exponent HC and 5-bit mantissa DA4~DA0. For example, HC=1, G=1.246, D=(65x1.246-33)/3=16 the D in binary form would be: D=16=1x24+0x23+0x22+0x21+0x20 The 6 bits (bit 5~bit 0) of the configuration register are set to 6’b110000. - 21 - July 2015, VA.00 16-Channel Constant Current LED Sink Driver with Compulsory Open-circuit Detection and Current Gain MBI5034 Staggered Delay of Output MBI5034 has a built-in delay circuit to perform delay mechanism. Among output ports exist a graduated 10ns delay time among 4 groups as shown in below chart by which the output ports will be turned on at a different time so that the instant current from the power line will be lowered. Output Group Output Channel Output Channel Output Channel Output Channel Output Group 1 OUT0 OUT4 OUT9 OUT13 Output Group 2 OUT2 OUT6 OUT11 OUT15 Output Group 3 OUT1 OUT5 OUT8 OUT12 Output Group 4 OUT3 OUT7 OUT10 OUT14 - 22 - July 2015, VA.00 16-Channel Constant Current LED Sink Driver with Compulsory Open-circuit Detection and Current Gain MBI5034 Package Power Dissipation (PD) The allowable maximum package heat dissipation is determined as PD(max)=(Tj–Ta)/Rth(j-a). When 16 output channels are turned on simultaneously, the actual package power dissipation is PD(act)=(IDDxVDD)+(IOUTxDutyxVDSx16). 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)]–(IDDxVDD)}/VDS /Duty/16, where Tj=150°C. The maximum power dissipation, PD(max)=(Tj–Ta)/Rth(j-a), decreases as the ambient temperature increases. MBI5034 Maximum Power Dissipation at Various Ambient Temperature Power Dissipation (W) 4.0 3.5 GF Type: Rth=68.44℃/W 3.0 GP Type: Rth=71.18℃/W 2.5 2.0 1.5 Safe Operation Area 1.0 0.5 0.0   0 10   20 30 40 50 60 Ambient Temperature（℃） 70 80   - 23 - July 2015, VA.00 16-Channel Constant Current LED Sink Driver with Compulsory Open-circuit Detection and Current Gain MBI5034 Load Supply Voltage (VLED) MBI5034 is designed to operate with VDS ranging from 0.4V to 1.0V, 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. Resisters or zener diode can be used in the applications as shown in the following figures. Supply Voltage (VLED) Supply Voltage VDrop VDrop VF (VLED) VF VDS VDS MBI5034 MBI5034 Switching Noise Reduction LED driver ICs are frequently used in switch-mode applications which always behave with switching noise due to parasitic inductance on PCB. To eliminate switching noise, refer to “Application Note for 8-bit and 16-bit LED Drivers- Overshoot”. - 24 - July 2015, VA.00 16-Channel Constant Current LED Sink Driver with Compulsory Open-circuit Detection and Current Gain MBI5034 Soldering Process of “Pb-free & Green” Package Plating* Macroblock has defined " Pb-Free & Green " to mean semiconductor products that are compatible with the current RoHS requirements and selected 100% pure tin (Sn) to provide forward and backward compatibility with both the current industry-standard SnPb-based soldering processes and higher-temperature Pb-free processes. Pure tin is widely accepted by customers and suppliers of electronic devices in Europe, Asia and the US as the lead-free surface finish of choice to replace tin-lead. Also, it is backward compatible to standard 215ºC to 240ºC reflow processes which adopt tin/lead (SnPb) solder paste. However, in the whole Pb-free soldering processes and materials, 100% pure tin (Sn) will all require from 245 oC to 260oC for proper soldering on boards, referring to JEDEC J-STD-020C as shown below. Temperature (℃) 300 260℃+0℃ -5℃ 245℃±5℃ 255℃ 250 240℃ 217℃ 30s max 200 Ramp-down 6℃/s (max) Average ramp-up rate= 0.7℃/s 150 100s max Peak Temperature 245℃~260℃< 10s 100 Average ramp-up rate = 0.4℃/s 50 Average ramp-up rate= 3.3℃/s 25 0 0 50 100 150 200 250 300 Time (sec) ----Maximum peak temperature Recommended reflow profile JEDEC J-STD-020C Acc.J-STD-020C Package Thickness Volume mm3