LM3528TMX

• 128 Exponential dimming steps
• Programmable auto-dimming function
• Up to 90% efficiency
• Low Profile 12 Jump μ - SMD Package (1.2 mm x 1.6 mm x 0.6 mm)
• Integrated OLED display power supply and LED driver
• LED indicator function programmable pattern generator output
• Drives up to 12 LEDs at 20mA
• Drives up to 5 LEDs at 20mA and provides 18V at 40mA
• 1% accurate current matching between strings
• Internal soft start limits inrush current
• True shutdown isolation of LEDs
• Wide 2.5V to 5.5V input voltage range
• 22V overvoltage protection
• 1.25MHz fixed frequency operation
• Dedicated programmable universal I/O
• Active low hardware reset

illustrate

The LM3528 current-mode boost converter provides two separate outputs. The first output (main) is a constant irradiation current that drives the series white LEDs. The second output (SUB/FB) is a configurable series of white LEDs with a bias set as a feedback pin for a constant sink current or constant output voltage to power the OLED panel.

As a dual-output white LED bias power supply, the LM3528 adaptively adjusts the power supply voltage of the LED string to maximize efficiency and ensure that the current absorption is maintained. The maximum current per output is through an external low-power resistor. One me 2 The C-compatible interface allows independent LED current adjustment, both from 0 to a maximum of 128 exponential step current output. When configured as a white LED + OLED bias power supply, the LM3528 can independently drive up to 6 white LED strings simultaneously and provide a constant output voltage of up to 21V for the OLED panel.

If the output overvoltage protection function is turned off in the device, if the above allows the use of a small low-voltage output capacitor of 22V, V OUT rises. Other features include a dedicated universal I/O (GPIO) and a multi-function pin (HWEN/PGEN/GPIO) that can be configured as a 32-bit pattern generator, hardware-enabled input, or as a GPIO. When configuring a pattern generator, either mode is programmed through I 2 C compatible interfaces and indicators HWEN/PPEN/GPIO output LED flashing or external logic control. The LM3528 is available in a tiny 12-bump μSMD package and operates over a temperature range of -40°C to +85°C.

apply

• Dual display backlight in portable applications
• Large format LCD backlight
• OLED panel power supply
• With indicator light to display backlight