EUP3651 Datasheet | Eutech Microelectronics

4-Channel, 1X/1.5X Charge Pump White LED Driver DESCRIPTION The EUP3651 is a high efficiency charge pump white LED driver. It supports 4 white LEDs with regulated constant current for uniform intensity. The EUP3651 maintains the highest efficiency by utilizing a 1.5X fractional charge pump and low dropout current regulators. A low external parts count (two 1u F flying capacitors and two small 1u F capacitors at VIN and VOUT) makes the EUP3651 ideally suited for small battery-powered applications. The EN logic input is used to enable, disable, and set current with a 16-step linear scale.The LED current can be configured between 5m A and 25m A. If EN is kept low for more than 1.5ms, the EUP3651 enters shutdown mode. The EUP3651 is available in a 12-pin 3mm x 3mm TDFN package. Features z z z z z z z z z z z 1X/1.5X Mode for Ultra-High Efficiency Up to 25m A Output Current for Each Channel 2.7V to 5.5V Input Voltage 1MHz Fixed Switching Frequency Single-Wire Serial Pulse Interface to Set LED Current with 16-step Linear scale Soft Start Function Built-In Short-Circuit Protection Built-in Thermal Protection IQ<1u A in Shutdown TDFN-12 Package Ro HS pliant and 100% Lead (Pb)-Free APPLICATIONS z z z z Mobile phone Small LCD Backlighting Programmable Current Sinks White Photo Flash for Digital Cameras Typical Application Circuit Figure 1. DS3651 Ver1.0 Feb. 2008 Block Diagram Figure 2. DS3651 Ver1.0 Feb. 2008 Pin Configurations Package Type Pin Configurations TDFN-12 Pin Description PIN 1 2 3 4 5 6 7 8 9 10 11 12 EP NAME LED4 EN C1P C1N VOUT C2P C2N VIN GND LED1 LED2 LED3 TAB LED4 cathode terminal Device enable (active high) and 1 wire control input Bucket capacitor 1, positive terminal Bucket capacitor 1, negative terminal Charge pump output, connect to LED anodes Bucket capacitor 2, positive terminal Bucket capacitor 2, negative terminal Charge pump input, connect to battery or supply Ground LED1 cathode terminal LED2 cathode...