IS31BL3228A/B中文资料A low noise constant frequency charge pump DC/DC converter for white LED applications数据手册Lumissil规格书

描述 Description

The IS31BL3228A (IS31BL3228B) is a low noise, constant frequency charge pump DC/DC converter for white LED applications. The IS31BL3228A (IS31BL3228B) is capable of driving up to four (six) channels of LEDs at preset 20mA per channel from a 2.8V to 5.5V input. The current sinks may be operated individually or in parallel for driving higher current LEDs. Only one 1μF small capacitor (at C+ thru C-) and two small 2.2μF capacitors (at VCC and VOUT) are needed, it makes this part ideally suited for small, battery-powered applications.

The serial digital input is used to enable, disable, and set current for each LED with 14 settings down to 1.8mA. Each output of the IS31BL3228A/IS31BL3228B is equipped with built-in soft-start circuitry prevents excessive inrush current during start-up. A low-current shutdown feature disconnects the load from the input and reduces quiescent current to less than 3μA.

The IS31BL3228A and IS31BL3228B are available in a Pb free, space-saving UTQFN-12 (2mm×2mm) package.

特性 Features

• VCC range: 2.8V to 5.5V
• Fully programmable current with single wire
• 14 current levels
• Drives up to four (IS31BL3228A)/six (IS31BL3228B) channels of LEDs
• No inductors, low noise operation
• Built-in thermal protection
• Automatic soft start
• Low shutdown current: ISD <3μA
• UTQFN-12 (2mm×2mm) package

应用 Application

• Cell phone, smart phone, PDA
• MP3, MP4, PMP
• White LED backlighting