MP3021 1x, 1.5x, 2x Auto-Adjust Charge Pump White LED Backlight Driver QFN16

MP3021 1x, 1.5x, 2x Auto-Adjust Charge Pump White LED Backlight Driver QFN16

The MP3021 is a WLED driver that can drive up to 4 backlight WLEDs at up to 30mA each.

Key Specifications

Features

• Backlight: up to 4 WLEDs at 30mA Each
• Single Wire Serial Bus (MPCTM Serial Data Link) Simple, Low Overhead Solution Fast Data Transfer Rate
• Good Current Matching at Low LED Current
• Thermal Shutdown Protection
• Under-Voltage Protection
• Available in a 3mm x 3mm 16-Pin QFN Package
• Low EMI Noise

Typical Application Circuit

Applications

• Cellular Phones
• PDA Phones

Design Notes

• Size the inductor for the ripple current at the actual switching frequency, typically 30% of the DC load — not for the DC rating alone.
• The hot loop from input capacitor through the switch to ground sets conducted EMI. Keep that copper area as small as the layout allows.
• Output ripple is set by the capacitor ESR and its DC-bias derating; a 10 µF ceramic often behaves like 4 µF at the rated output voltage.
• Route the feedback divider from the output capacitor terminals, away from the switch node.

Common Questions