Features for the LM3528TMEV
- 128 Exponential Dimming Steps
- Programmable Auto-Dimming Function
- UP to 90% Efficient
- Low Profile 12 Bump m- SMD Package (1.22mm x 1.62mm x 0.6mm)
- SMD Package (1.22mm x 1.62mm x 0.6mm)
- Integrated OLED Display Power Supply and LED Driver
- Programmable Pattern Generator Output for LED Indicator Function
- Drives up to 10 LED's at 30mA
- Drives up to 4 LED's at 20mA and delivers 18V at 40mA
- 1% Accurate Current Matching Between Strings
- Internal Soft-Start Limits Inrush Current
- True Shutdown Isolation for LEDs
- Wide 2.7V to 5.5V Input Voltage Range
- 21V Over-Voltage Protection
- 1.25MHz Fixed Frequency Operation
- Dedicated Programmable General Purpose I/O
- Active High Hardware Enable
- Active Low Hardware Reset
Applications:
- Dual Display LCD Backlighting for Portable Applications
- Large Format LCD Backlighting
- OLED Panel Power Supply
- Display Backlighting with Indicator Light
Description for the LM3528TMEV
The LM3528 current mode boost converter offers two separate outputs. The first output (MAIN) is a constant current sink for driving series white LED's. The second output (SUB/FB) is configurable as a constant current sink for series white LED bias, or as a feedback pin to set a constant output voltage for powering OLED panels.
As a dual output white LED bias supply the LM3528 adaptively regulates the supply voltage of the LED strings to maximize efficiency and insure the current sinks remain in regulation. The maximum current per output is set via a single external low power resistor. An I2C compatible interface allows for independent adjustment of the LED current in either output from 0 to max current in 128 exponential steps. When configured as a white LED + OLED bias supply, the LM3528 can independently and simultaneously drive a string of up to 5 white LEDs and deliver a constant output voltage of up to21V for OLED panels.