Macroblock
Preliminary Datasheet
MBI5368
8-channel x 3 Constant Current LED Sink Driver
Features
z 24 constant-current output channels z Constant output current invariant to load voltage change z 256-step run-time programmable output current gain control z Output current adjusted through three external resistors z Constant output current range: 10 -60 mA z Excellent output current accuracy:
between channels: < ±5% (max.), and between ICs: < ±6% (max.) z 25MHz clock frequency z Schmitt trigger input z 3.3V / 5V supply voltage z Optional for “Pb-free & Green” Package
Low Profile Quad Flat Pack (LQFP)
GLQ: 48L (7 x 7 mm2)
Current Accuracy
Between Channels
Between ICs
< ±5%
< ±6%
Conditions
IOUT = 10 ~ 60 mA, VDS = 0.8V
Product Description
MBI5368 is designed for fine pitch LED display applications and exploits PrecisionDrive™ technology to provide uniform and constant current sinks for driving LEDs within a large range of VF variations. In one package, MBI5368 incorporate three 8-channel drivers that output current can be adjusted through three external resistors and moreover be programmable to 256 gain steps for LED white balance
MBI5368 provides users with great flexibility and small package while using surface mounted RGB LEDs to display precisely video color. Users may adjust the output current from 10 mA to 60 mA through separately external resistor Rext and 8-bit current gain control, which gives users flexibility in the color correction of LEDs.
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:
[email protected]
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March 2005, V1.02
MBI5368
8-channel x 3 Constant Current LED Sink Driver
Applications
Indoor/outdoor LED video display
Typical Application Circuit
Function Generator
4.5~5.5 V 47u F
20 mA
Figure 1
48 47 46 45 44 43 42 41 40 39 38 37
1
36
2
35
3
34
4
33
5
32
6
31
7
30
8
29
9
28
10
27
11
26
12
25
13 14 15 16 17 18 19 20 21 22 23 24
900 ohm
Pin Configuration
48 CLK_A 47 SDI_A 46 OUT3_B 45 OUT2_B 44 GND_B 43 OUT1_B 42 OUT0_B 41 LE/MOD/CA_B 40 CLK_B 39 SDI_B 38 OUT3_C 37 OUT2_C
LE/MOD/CA_A 1 OUT0_A 2 OUT1_A 3 OUT2_A 4 OUT3_A 5 GND_A 6 VDD_A 7 OUT4_A 8 OUT5_A 9 OUT6_A 10 OUT7_A 11
OE/SW_A 12
Figure 2
SDO_A 13 R-EXT_A 14 OUT4_B 15 OUT5_B 16 OUT6_B 17 OUT7_B 18 OE/SW_B 19
SDO_B 20 R-EXT_B 21
VDD_B 22 OUT4_C 23 OUT5_C 24
36 OUT1_C 35 LE/MOD/CA_C 34 CLK_C 33 SDI_C 32 OUT0_C 31 GND_C 30 VDD_C 29 OUT7_C 28 R-EXT_C 27 SDO_C 26 OE/SW_C 25 OUT6_C
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March 2005, V1.02
MBI5368
8-channel x 3 Constant Current LED Sink Driver
Terminal Description
Pin No. 6, 44, 31
Pin Name
Function
GND_A, GND_B, GND_C Ground terminal for control logic and current sinks
47, 39, 33
SDI_A, SDI_B, SDI_C
Serial-data input to the shift register
48, 40, 34 1, 41, 35
CLK_A, CLK_B, CLK_C
LE/MOD/CA_A, LE/MOD/CA _B, LE/MOD/CA _C
Clock input terminal for data shift on rising edge
Output channel data strobe input terminal: in the Normal Mode phase, serial data in the Shift Register is transferred to the respective Output Latch when LE/MOD/CA is high; the data is latched inside the Output Latch when LE/MOD/CA goes low. If the data in the Output Latch is “1” (High), the respective output channel will be enabled after OE /SW is pulled down to low. Mode selection input terminal: in the Mode Switching phase, LE/MOD/CA couldn’t strobe serial data but its level is used for determining the next mode to which MBI5170 is going to switch. When LE/MOD/CA is high, the next mode is the Current Adjust Mode; when low, the next mode is the Normal Mode. Configuration data strobe input terminal: in the Current Adjust Mode phase, serial data is latched into the Configuration Latch, instead of the Output Latch in the Normal Mode. The serial data here is regarded as the Configuration Code, which affect the output current level of all channels. (See Operation Principle)
2-5, 8-11, 15-18, 23-25, 32, 36-38,
42, 43, 45, 46
OUT0 _A ~ OUT7 _A, OUT0 _B ~ OUT7 _B, OUT0 _C ~ OUT7 _C
12, 19, 26
OE /SW_A, OE /SW_B, OE /SW_C
Constant current output terminals
Output enable terminal: no matter in what phase MBI5368 operates, the signal OE /SW can always enable output drivers to sink current. When its level is (active) low, the output drivers are enabled; when high, all output drivers are turned OFF (blanked). Mode switching trigger terminal: a one-clock-wide short signal pulse of OE /SW could put MBI5368 into the Mode Switching phase. (See Operation Principle)
13, 20, 27
SDO_A, SDO_B, SDO_C Serial-data output to the following SDI of next driver IC
14, 21, 28
R-EXT_A, R-EXT_B, R-EXT_C
Input terminal used to connect an external resistor for setting up output current for all output channels
7, 22, 30
VDD_A, VDD_B, VDD_C 3.3V / 5V supply voltage terminal
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March 2005, V1.02
MBI5368
8-channel x 3 Constant Current LED Sink Driver
In MBI5368, the relationship between the functions of pin1, 41, 3.