ACT6311

ACT6311 ACTIVE-SEMI | Alldatasheet

Document overview

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Technical content

Innovative PowerTM - 1 - www.active-semi.com Copyright © 2011 Active-Semi, Inc. ACT6311 White LED/OLED Step-Up Converter Efficiency vs. Output Current Efficiency (%) Output Current (mA) VIN = 3.6V VIN = 3V ACT6311-0001

FEATURES

• Adjustable Output Voltage
• Drives OLEDs or White LEDs
• 30V High Voltage Switch
• 1MHz Switching Frequency
• Tiny Inductors and Capacitors
• Tiny SOT23-5 Package

APPLICATIONS

• OLED Applications
• Cell Phones
• Digital Cameras
• PDAs, Laptops
• MP3 Players
• GPS GENERAL DESCRIPTION The ACT6311 step-up DC/DC converter is optimized for driving OLEDs or white LEDs. It can provide an output voltage up to 24V. The device is capable of driving up to seven LEDs in series from a Lithium-Ion battery, with inherent current matching and uniform brightness. The ACT6311 incorporates a 30V high voltage switch. The device operates at 1MHz and allows the use of few external components. The ACT6311 is available in the tiny SOT23-5 package. 100 0 5 10 15 20 25 30 35 VIN = 3V VIN = 3.6V

Figure 1. Typical Application Circuit

Innovative PowerTM - 2 - www.active-semi.com Copyright © 2011 Active-Semi, Inc. Rev 3, 22-Feb-11

ORDERING INFORMATION

PART NUMBER TEMPERATURE RANGE PACKAGE PINS TO P MARK PACKING ACT6311UC-T -40°C to 85°C SOT23-5 5 YCXB TAPE & REEL PIN DESCRIPTION PIN NUMBER PIN NAME PIN DESCRIPTION 1 SW Switch Output. Connect this pin to the inductor and the Schottky diode. To reduce EMI, minimize the PCB trace path between this pin and the input bypass capacitor. 2 G Ground. 3 FB Feedback Input. This pin is referenced to 1.24V 4 SHDN Shutdown Control. Connect to a logic high to enable the device. Connect to a logic low to disable the device. Never leave the pin unconnected. 5 IN Supply Input. Bypass to G with a capacitor 1µF capacitor or higher. Figure 2: Application as White LED Drive IN SHDN SW G FB SOT23-5 ACT6311 UC G

Innovative PowerTM - 3 - www.active-semi.com Copyright © 2011 Active-Semi, Inc. Rev 3, 22-Feb-11 ABSOLUTE MAXIMUM RATINGS PARAMETER VALUE UNIT IN, SHDN Voltage -0.3 to 6 V SW Voltage -0.3 to 30 V FB Voltage -0.3 to VIN + 0.3 V Maximum Power Dissipation (derate 5mW/°C above TA = 50°C) 0.4 W Junction to Ambient Thermal Resistance (θJA) 190 °C/W Operating Junction Temperature -40 to 150 °C Lead Temperature (Soldering, 10 sec) 300 °C PARAMETER SYMBOL TEST COND ITIONS MIN TYP MAX UNIT Input Voltage Range 2.5 5.5 V Feedback Voltage V FB V IN = 3V 1.18 1.24 1.30 V FB Input Current 50 nA Supply Current SHDN = IN 0.7 1.5 mA Supply Current in Shutdown SHDN = G 0 1 µA Switching Frequency f SW 0.8 1 1.2 MHz Maximum Duty Cycle D MAX 80 85 % Switch Current Limit I LIM 75% Duty Cycle 320 mA Switch On Voltage I SW = 200mA 350 mV Switch Leakage Current V SW = 20V, SHDN = G 10 µA SHDN Logic High Threshold 1.6 V SHDN Logic Low Threshold 0.4 V SHDN Input Current 0 1 µA (Note: Exceeding these limits may damage the device. Exposure to absolute maximum rating conditi ons for long periods may affect device reliability.)

ELECTRICAL CHARACTERISTICS

(VIN = VSHDN = 3V, TA = 25°C, unless otherwise specified.)

Innovative PowerTM - 8 - www.active-semi.com Copyright © 2011 Active-Semi, Inc. Rev 3, 22-Feb-11 TYPICAL PERFORMANCE CHARACTERISTICS (Circuit of Figure 1, unless otherwise specified.) 1.30 1.25 1.20 Line Regulation 1.15 1.10 -40 -15 10 35 60 85 Temperature (°C) FB Voltage vs. Temperature FB Voltage (V) 14.0 13.5 13.0 12.5 12.0 Input Voltage (V) Output Voltage (V) 12.0 12.5 13.0 13.5 14.0 0 5 10 15 20 25 30 35 Load (mA) Load Regulation Output Voltage (V) 1.10 1.05 1.00 0.95 0.90 -40 -15 10 35 60 85 Temperature (°C) Switching Frequency vs. Temperature Switching Frequency (MHz) 250 300 250 400 450 Current Limit (mA) Duty Cycle (%) Current Limit vs. Duty Cycle 20 30 40 50 60 70 80 Efficiency (%) Efficiency vs. Output Voltage Output Current (mA) 100 0 5 10 15 20 25 30 35 VIN = 3.6V IOUT = 20mA ACT6311-0001 ACT6311-0002 ACT6311-0003 ACT6311-0004 ACT6311-0005 ACT6311-0006 VIN = 3.6V VIN = 3V VIN = 3V

Innovative PowerTM - 9 - www.active-semi.com Copyright © 2011 Active-Semi, Inc. Rev 3, 22-Feb-11 ACT6311-0007 ACT6311-0008 ACT6311-0009 ACT6311-0010 ACT6311-0011 Switching Waveform in Discontinuous Mode SW 5V/DIV Inductor Current 100mA/DIV VIN = 3V No load VIN = 3.6V ILOAD = 20MA VIN = 3.6V VOUT = 13.6V VOUT = 13.6V IOUT = 10mA VIN = 3.6V ILOAD = 20mA Test Circuit Figure 8 Startup without Soft Start Circuit Load Step Response Startup with Soft Start Circuit Line Step Response 1µs/DIV SHDN TYPICAL PERFORMANCE CHARACTERISTICS CONT’D (Circuit of Figure 1, unless otherwise specified.) 20µs/DIV VOUT 200mV/DIV Inductor Current 200mA/DIV VOUT 5V/DIV 4ms/DIV SHDN Inductor Current 50mA/DIV VOUT 5V/DIV 100µs/DIV VOUT 1V/DIV 20mA Load Step 2mA 100µs/DIV VOUT 500mV/DIV VIN 5.5V

Innovative PowerTM - 10 - www.active-semi.com Copyright © 2011 Active-Semi, Inc. Rev 3, 22-Feb-11 PACKAGE OUTLINE SOT23-5 PACKAGE OUTLINE AND DIMENSIONS SYMBOL DIMENSION IN MILLIMETERS DIMENSION IN INCHES MIN MAX MIN MAX A - 1.450 - 0.057 A1 0.000 0.150 0.000 0.006 A2 0.900 1.300 0.035 0.051 b 0.300 0.500 0.012 0.020 c 0.080 0.220 0.003 0.009 D 2.900 BSC 0.114 BSC E 1.600 BSC 0.063 BSC E1 2.800 BSC 0.110 BSC e 0.950 BSC 0.037 BSC e1 1.900 BSC 0.075 BSC L 0.60REF L1 0.300 0.600 0.012 0.024 θ 0° 8° 0° 8° 0.024REF Active-Semi, Inc. reserves the right to modify the circuitry or specifications without notice. User s should evaluate each product to make sure that it is suitable for their applicat ions. Active-Semi products are not intended or authorized for use as critical components in life-support dev ices or systems. Active-Semi, Inc. does not assume any liability arising out of the use of any product or circuit described in this datasheet, nor does it convey any patent license. Active-Semi and its logo are trademarks of Active-Semi, Inc. For more information on this and other products, contact sales@active-semi.com or visit http://www.active-semi.com. is a registered trademark of Active-Semi.