Macroblock MBI5253 SRAM Embedded S-PWM



16-Channel PWM Constant Current LED Driver for 1:32 Time-Multiplexing Applications

The MBI5253 is an upgraded version of MBI5153 16-Channel SRAM LED Display Driver IC, which is one of the company’s best-selling LED driver IC for 1.2~ 4mm pixel pitch LED displays for many years. MBI5253 is featured with all advantages of its precedent product, but improved on high contrast interference elimination, delivering better visual performance.

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 VF 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.

  • 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