IS31BL3212 FOUR CHANNEL CONSTANT CURRENT LED DRIVER June 2014 GENERAL DESCRIPTION FEATURES The IS31BL3212 provides four regulated current Ultra low headroom voltage sources, delivers up to 23mA of load current to Cost effective LED driver accommodate four white LEDs. It requires no charge Four channel constant current output ideal for pump, has no noise and significantly improved the driving LEDs efficiency. Best noise and efficiency performance The serial digital input is used to enable, disable, and Ultra low quiescent supply current: 1.0mA (Typ.) set current for each LED with 16 settings down to Highly integrated design, minimal component 0.69mA. A low-current shutdown feature disconnects Low shutdown current: 1.0 A (Typ.) the load from the input and reduces quiescent current typically 1.0mA. APPLICATIONS The IS31BL3212 is available in a Pb-free, White LED display backlights space-saving 2mm2mm DFN-8 and SOT23-6 White LED keypad backlights package. Cell Li-ion battery-operated equipment including PDAs, hand-held PCs, cellular phone TYPICAL APPLICATION CIRCUIT Figure 1 Typical Application Circuit Figure 2 Application Circuit for Less Than 4 LEDs Note: If less than four LEDs connected, the left pin can be floating or connected to GND. Connecting to GND is recommended. Lumissil Microsystems www.lumissil.com 1 Rev. C, 06/24/2014 IS31BL3212 PIN CONFIGURATION Package Pin Configuration (Top View) DFN-8 EN/SET 1 6 D3 SOT23-6 GND 5 D2 2 VCC 34 D1 PIN DESCRIPTION No. Pin Description DFN-8 SOT23-6 D4 1 - White LED channel. D3~D1 2~4 6~4 White LED channel. VCC 5 3 Power supply input. GND 6 2 Ground. Serial digital input, control the output EN/SET 7 1 current. Internal 500k pull down resistor. NC 8 - No connection. Thermal Pad - Connect to GND. Lumissil Microsystems www.lumissil.com 2 Rev. C, 06/24/2014