EUP2584 EUTECH | Alldatasheet

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Technical content

DS2584 Ver1.1 Mar. 2008 White LED Step-Up Converter In Tiny SOT-23 Package

DESCRIPTION

The EUP2584 is a constant current step-up converter specifically designed to drive white LEDs. The Step-up converter topology allows series connection of the white LEDs so the LED currents are identical for uniform brightness. The EUP2584 switches at 1.1MHz, allowing the use of tiny external components. The input and output capacitor can be as small as 1µF, saving space and cost versus alternative solutions. A low 0.25V feedback voltage minimizes power loss in the current setting resist or for better efficiency. EUP2584 is enhanced with Soft-Start function and that could significantly reduce noise induced by capacitor. The EUP2584 is available in low profile SOT23-6 package. Typical Application Circuit

FEATURES

z 2.6V to 5.5V Input Range z 27V Output with Over Voltage Protection z High Efficiency :85 % Typical z Internal Soft-Start z PWM Dimming Control z Internal High Power 30V MOSFET Switch z Fast 1.1MHz Switching Frequency z Small, Low-Profile Inductors and Capacitors z SOT23-6 Package z RoHS Compliant and 100% Lead (Pb)-Free

APPLICATIONS

z PDAs, Handheld Computers z MP3 Players z GPS Receivers Figure 1. White LED Application

DS2584 Ver1.1 Mar. 2008 Pin Configurations Package Type Pin Configurations SOT23-6 Pin Description PIN SOT23-6 DESCRIPTION LX 1 Switch Pin. Connect inductor/diode here. Minimize trace area at this pin to reduce EMI. GND 2 Common Ground FB 3 Feedback Pin. Reference voltage is 0.25V . Connect cathode of lowest LED and resistor here. Calculate resistor value according to the formula: RFB=0.25/ILED EN 4 Chip Enable Pin. Connect to 1.4V or higher to enable device, 0.3V or less to disable device. IN 6 Input Supply V oltage OUT 5 Overvoltage Sense. When VOUT is greater than 27V , the internal N-channel MOSFET turns off until V OUT drops below 25V , then the IC reenters start. Connect a 1uF capacitor from OUT to GND.

DS2584 Ver1.1 Mar. 2008

Ordering Information

Order Number Package Type Marking Operating Temperature range EUP2584VIR1 SOT23-6 q0 □ □ □ □ -40 °C to 85°C EUP2584 □ □ □ □ Lead Free Code 1 : L e a d F r e e 0 : L e a d Packing R : T a p e & R e e l Operating temperature range I: Industry Standard Package Type V : S O T 2 3 Block Diagram Figure 2.

DS2584 Ver1.1 Mar. 2008 Absolute Maximum Ratings „ Power dissipation, PD@ TA=25°C „ Package Thermal Resistance Operating Conditions

Electrical Characteristics

(VIN =3.6V , VOUT=18V , COUT=1µF, CIN=1µF, RSENSE=12Ω, TA=-40°C to 85°C. Unless otherwise noted. Typical values are at TA= 25°C) EUP2584 Symbol Parameter Conditions Min Typ Max. Unit Supply V oltage -- -- 6 V Maximum Output V oltage No Switching -- -- 30 V ICC1 Supply Current V CC=6V , Continuous Switching -- 0.8 1.3 mA ICC2 Quiescent Current V CC=6V , FB=1.3V , No Switching -- 115 150 µA ICC3 Shutdown current V CC=6V , VEN<0.3V -- 0.1 1 µA Oscillator Fosc Operation Frequency 0.8 1.1 1.3 MHz Dmax Maximum Duty Cycle 89 92 96 % Reference Voltage VFB Feedback V oltage 230 250 270 mV MOSFET Rds (on) On resistance of MOSFET -- 1 1.5 Ω ILX Current Limit 0.4 0.8 1.2 A Control and Protection VEN1 Shutdown V oltage 0.3 0.7 -- V VEN2 Enable V oltage -- 0.7 1.4 V IEN EN Pin Pull Low Current -- -- 0.1 µA

DS2584 Ver1.1 Mar. 2008 80% 82% 84% 86% 88% 90% 23456 Vin ( V) Ef f iciency (% ) IO = 2 0 m A IO = 1 5 m A 80% 81% 82% 83% 84% 85% 22 . 533 . 5 Vin (V) Ef f iciency (% ) IO=15mA IO=20mA 74% 76% 78% 80% 82% 84% 23456 Vin (V) E fficiency (% ) I O=20m A I O=15m A Typical Operating Characteristics Efficiency vs. Vin (Driving 1WLED) Efficiency vs. VIN (Driving 6WLEDs) VIN=3.6V Driving 2LEDs Stability Efficiency vs. VIN (Driving 3WLEDs) VIN=2.6V Driving 2LEDs Stability VIN=5V Driving 2LEDs Stability

DS2584 Ver1.1 Mar. 2008 VIN=2.6V Driving 4LEDs Stability V IN=5V Driving 4LEDs Stability V IN=3.6V Driving 6LEDs Stability VIN=3.6V Driving 4LEDs Stability V IN=2.6V Driving 6LEDs Stability V IN=5V Driving 6LEDs Stability

DS2584 Ver1.1 Mar. 2008 VIN=3.6V Driving 2LEDs Inrush Current V IN=3.6V Driving 6LEDs Inrush Current VIN=3.6V Driving 6LEDs 1KHz PWM Dimming V IN=3.6V Driving 4LEDs Inrush Current V IN=3.6V Driving 6LEDs 100Hz PWM Dimming VIN=3.6V Driving 6LEDs 10KHz PWM Dimming

DS2584 Ver1.1 Mar. 2008 VIN=3.6V Driving 6LEDs 100KHz PWM Dimming

DS2584 Ver1.1 Mar. 2008 Packaging Information SOT23-6 MILLIMETERS INCHES SYMBOLS MIN. MAX. MIN. MAX. A - 1.45 - 0.057 A1 0.00 0.15 0.000 0.006 b 0.30 0.50 0.012 0.020 D 2.90 0.114 E1 1.60 0.063 e 0.95 0.037 E 2.60 3.00 0.102 0.118 L 0.3 0.60 0.012 0.024