Preliminary Datasheet LP3361 6-Channel Constant Current White LED Driver General Description Features The LP3361 is a low-dropout bias supply for white LEDs is a high-performance alternative to the simple ballast resistors used in conventional white LED designs. It supports 6 white LEDs with regulated constant current for uniform intensity. The LP3361 maintains low dropout current regulators. The LP3361 requires a 45mV dropout at a 20mA load on each output to match the LED brightness. The brightness of LEDs can be tuned through a pulse width modulated signal at the PWM pin,the PWM frequency from 200Hz to 10KHz and the Duty from 0 to 100%. 2.7V to 6V Input Voltage 20mA maxim sink current Dual Panel Driver of WLED PWM tuned LED brightness through EN pin Soft Start Function Built-in Thermal Protection IQ<1uA in Shutdown TDFN-10 Package RoHS Compliant and 100% Lead (Pb)-Free The LP3361 is available in a TDFN-10 package. Typical Application Circuit Main_Panel LP3361 VBAT 3 8 LED1 VDD1 LED2 VDD2 LED3 ON/OFF 2 7 LED4 EN2 LED5 Order Information LP3361 - EN1 11 GND LED6 □ □ □ 4 5 6 9 10 Sub_Panel 2.2uF F: Pb-Free Package Type QV:TDFN-10 1 Marking Information Please see website. Applications LCD Panel Cellular and Smart mobile phone PDA/DSC PMP LP3361 – Ver. 1.0 Datasheet Nov.-2008 Page 1 of 6 VBAT Preliminary Datasheet LP3361 Application Information Main_Panel LP3361 VBAT 3 8 LED1 VDD1 LED2 VDD2 LED3 MAIN_CTRL 2 ON OFF 7 EN1 LED4 LED5 11 GND LED6 Main_Panel LP3361 VBAT LED1 3 VDD1 4 LED2 8 VDD2 5 LED3 9 Backlight_CTRL 2 EN1 ON 7 EN2 Key Pad_CTRL 11 LED5 10 6 OFF EN2 SUB_CTRL VBAT 1 LED4 LED6 GND VBAT 1 4 2.2uF 5 6 9 KeyPad_LED 10 Sub_Panel 2.2uF LP3361 Driver Dual Panel Application 5PCS LED LP3361 VBAT 3 8 LED1 VDD1 LED2 VDD2 LED3 ON/OFF 2 7 EN1 LED4 GND VBAT 1 LED6 6PCS LED LP3361 VBAT 3 4 8 5 LED1 VDD1 LED2 VDD2 LED3 ON/OFF 6 2 NC 7 EN2 LED5 11 LP3361 Driver Panel and Keypad WLED Application 9 EN1 LED4 EN2 LED5 10 11 GND LED6 4 5 6 9 10 2.2uF 2.2uF LP3361 Driver 5pcs White-LED Application 4PCS LED LP3361 VBAT 3 NC 8 LED1 VDD1 LED2 VDD2 LED3 ON/OFF 2 NC 7 EN1 LED4 LED5 11 GND VBAT 1 LP3361 VBAT 3 4 8 5 LED6 LED1 VDD1 LED2 VDD2 LED3 ON/OFF 6 2 9 EN1 LED5 2.2uF NC Nov.-2008 LED4 EN2 NC 10 LP3361 Driver 4pcs White-LED Application LP3361 – Ver. 1.0 Datasheet LP3361 Driver 6pcs White-LED Application 7 EN2 VBAT 1 11 GND LED6 1 Flash LED VBAT 4 5 6 22uF 9 10 EN1 0 0 1 1 EN2 0 1 0 1 ILED 0mA 40mA 80mA 120mA LP3361 Driver Flash White-LED Application Page 2 of 6 Preliminary Datasheet LP3361 Functional Pin Description P a c k a g e Ty p e Pin Configurations LED1 1 EN1 2 10 LED6 9 LED5 8 VDD2 11 VDD1 TDFN-10 3 GND LED2 4 7 EN2 LED3 5 6 LED4 PIN NAME 1 LED1 LED1 cathode terminal. 20mA Current flows into LED. Floating is used to disable. 2 EN1 Device enable1 (active high).Control from LED1 to LED4 and used a PWM dimming brightness. 3 VDD1 LED1~LED4 power supply. 4 LED2 LED2 cathode terminal. 20mA Current flows into LED. Floating is used to disable. 5 LED3 LED3 cathode terminal. 20mA Current flows into LED. Floating is used to disable. 6 LED4 LED4 cathode terminal. 20mA Current flows into LED. Floating is used to disable. 7 EN2 Device enable2 (active high).Control from LED5 to LED6 and used a PWM dimming brightness. 8 VDD2 LED5,LED6 power supply. 9 LED5 LED2 cathode terminal. 20mA Current flows into LED. Floating is used to disable. 10 LED6 LED2 cathode terminal. 20mA Current flows into LED. Floating is used to disable. 11 GND Gound. LP3361 – Ver. 1.0 Datasheet DESCRIPTION Nov.-2008 Page 3 of 6 Preliminary Datasheet Absolute Maximum Ratings LP3361 Input Voltage to GND (VDD1, VDD2) ---------------------------------------------------------------------- 6.5V EN to GND Voltage (VEN) ---------------------------------------------------------------------- -0.3V to Vin+0.3V Operating Junction Temperature Range (TJ) -------------------------------------------------- Maximum Soldering Temperature (at leads, 1 0sec) ----------------------------------------------------- 300℃ -40℃ to 125℃ Thermal Information Maximum Power Dissipation (PD) DFN-10 ---------------------------------------------------------------- 1.5W Thermal Resistance (JA) ------------------------------------------------------------------------------------ 58℃/W Electrical Characteristics (Over recommended operating conditions unless specified otherwise) VINA =3.6V,EN=High, TA=25℃ ) Parameter Symbol Conditions Min. 3 Input Voltage Quiescent Current No Load, ISHDN ILED-ERR Shutdown Current EN = GND LED Current Accuracy 3mA< ILED<30mA 19.4 ILED-LED-ERR LED Channel Matching Any two channel mismatch -3 VEN(L) Enable Threshold Low VEN(H) Enable Threshold High VIN IQ LP3361 – Ver. 1.0 Datasheet Nov.-2008 LP3361 Typ. Unit 75 Max. 5.5 75 V uA 0.1 1 µA 20.6 mA 3 % 0.5 V 20 2 V Page 4 of 6 Preliminary Datasheet LP3361 Typical Operating Characteristics LP3361 – Ver. 1.0 Datasheet Nov.-2008 Page 5 of 6 Preliminary Datasheet LP3361 Packaging Information LP3361 – Ver. 1.0 Datasheet Nov.-2008 Page 6 of 6