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Macroblock, Inc. 2018
Floor 6-4, No.18, Pu-Ting Rd., Hsinchu, Taiwan 30072, ROC.
TEL: +886-3-579-0068, FAX: +886-3-579-7534 E-mail: info@mblock.com.tw
- 1 -
Macroblock
Advance Information
MBI5253
16-Channel PWM Constant Current LED Driver
for 1:32 Time-Multiplexing Applications
for 1:16 Time-multiplexing
Applications
March 2018, V0.01
Features
3V-5.5V supply voltage
16 constant current output channels
Constant output current range:
- 0.5~20mA @ 5V supply voltage
- 0.5~15mA @ 3.3V supply voltage
Excellent output current accuracy:
Between channels::<±2.5%(Max.)
Between ICs: <±3%(Max.)
Digital Power-On-Reset
Built-in 16K-bit SRAM to support time-multiplexing for 1 ~ 32 scans
14-bit /13-bit color depth PWM control to improve visual refresh rate
6-bit current gain,12.5%~100%
LED failure isolation
-LED failure induced cross elimination
Compulsory LED open detection
Integrating ghost elimination circuit
Improvement of high contrast interference
GCLK multiplier technology
Support double refresh mode
Maximum data clock frequency: 30MHz@VDD=5V
Maximum gray-scale clock frequency: 33MHz @VDD=5V
Product Description
MBI5253 is designed for LED video applications using internal Pulse Width Modulation (PWM) control with
selectable 14-bit / 13-bit color depth. MBI5253 features a 16-bit shift register which converts serial input data into
each pixel’s gray scale of the output port. Sixteen regulated current ports are designed to provide uniform and
constant current sinks for driving LEDs with a wide range of V
F
variations. The output current can be preset through
an external resistor. The innovative architecture with embedded SRAM is designed to support up to 1:32
time-multiplexing applications. Users only need to send the whole frame data once and to store in the embedded
SRAM of the LED driver, instead of sending every time when the scan line is changed. It helps to save the data
bandwidth and to achieve high grayscale with very low data clock rate. With scan-type Scrambled-PWM (S-PWM)
technology, MBI5253 enhances PWM by scrambling the “on” time of each scan line into several “on” periods and
sequentially drives each scan line for a short “on” period. The enhancement equivalently increases the visual refresh
rate of scan-type LED displays. In addition, the innovative GCLK multiplier technique doubles visual refresh rate.
MBI5253 drives the corresponding LEDs to the brightness specified by image data. With MBI5253, all output
channels can be built with 14-bit color depth (16,384 gray scales). When building a 14-bit color depth video, S-PWM
technology reduces the flickers and improves the image fidelity.
Quad Flat No-leads
GFN: QFN24L-4x4-0.5
Shrink SOP
GP: SSOP24L-150-0.64
MBI5253 16-Channel PWM Constant Current LED Driver
for 1:32 Time-multiplexing Applications
March 2018, V0.01
- 2 -
Through compulsory error detection, MBI5253 detects individual LED for open-circuit errors without extra
components. MBI5253 equipped an innovative cross elimination function, and it solves the cross phenomenon
induced by failure LEDs. Besides, integrated ghost elimination and high contrast interference circuit eases the ghost
problems and improve image contrast.
MBI5253 16-Channel PWM Constant Current LED Driver
for 1:32 Time-multiplexing Applications
March 2018, V0.01
- 3 -
Block Diagram
Figure 1
LE
I
O
Regulator
R-EXT
GND
16-bit Shift Register (FIFO)
SDI
DCLK
SDO
Control
Unit
16-bit
Counter
16
OUT0
1OUT
OUT14
OUT15
Comparators
Comparators
Comparators
Comparators
16
GCLK
Configuration
Register
16
16K-bit
SRAM Buffers
16
Output Buffers
16
16
16-bit error status
16
Pre-charge
Circuit
Digital to
analog
converter
MBI5253 16-Channel PWM Constant Current LED Driver
for 1:32 Time-multiplexing Applications
March 2018, V0.01
- 4 -
1
2
3
12
11
8
4
5
6
9
7
10
16
13
15
17
19
20
21
18
22
23
14
24
GND
SDI
DCLK
LE
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
OUT0
VDD
SDO
R-EXT
OUT8
OUT12
OUT13
OUT14
OUT11
OUT10
OUT9
OUT15
GCLK
Pin Configuration
Terminal Description
Pin Name
Function
GND
Ground terminal for control logic and current sink
SDI
Serial-data input to the shift register
DCLK
Clock input terminal used to shift data on rising edge and carries
command information when LE is asserted.
LE
Data strobe terminal and controlling command with DCLK
OUT0
~
OUT15
Constant current output terminals
GCLK
Gray scale clock terminal
Clock input for gray scale. The gray scale display is counted by gray scale
clock compared with input data.
SDO
Serial-data output to the receiver-end SDI of next LED driver
R-EXT
Input terminal used to connect an external resistor for setting up output
current for all output channels
VDD
3.3V/5V supply voltage terminal
MBI5253GP
14
13
15
16
17
18
5
6
4
3
2
1
8
7
9 10 11 12
23
24
22 21 20 19
DCLK
SDI
VDD
R-EXT
SDO
OUT9
OUT8
OUT7
OUT6
OUT5
OUT4
OUT3
OUT2
OUT1
OUT0
LE
GCLK
GND
OUT10
OUT15
OUT14
OUT13
OUT12
OUT11
MBI5253GFN
MBI5253 16-Channel PWM Constant Current LED Driver
for 1:32 Time-multiplexing Applications
March 2018, V0.01
- 5 -
Equivalent Circuits of Inputs and Outputs
GCLK, DCLK, SDI terminal
VDD
IN
LE Terminal
VDD
IN
SDO Terminal
VDD
OUT
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