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FSP3307 Dataheets PDF



Part Number FSP3307
Manufacturers Linear
Logo Linear
Description White LED Step-Up Converter
Datasheet FSP3307 DatasheetFSP3307 Datasheet (PDF)

FSP3307 WHITE LED STEP-UP CONVERTER N FEATURES s Inherently Matched LED Current s Drives Up to 8 LEDs from a 3.6V Supply s No External Schottky Diode Required s 1.2MHz Switching Frequency s Automatic Soft-Start s Open LED Protection s High Efficiency: 81% s Requires Only 0.22uF Output Capacitor s Low Profile (1mm) SOT-23 Packaging APPLICATION s Cellular Phones s PDAs, Handheld Computers s Digital Cameras s MP3 Players s GPS Receivers DESCRIPTIO The FSP3307 IS step-up DC/DC converters designe.

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FSP3307 WHITE LED STEP-UP CONVERTER N FEATURES s Inherently Matched LED Current s Drives Up to 8 LEDs from a 3.6V Supply s No External Schottky Diode Required s 1.2MHz Switching Frequency s Automatic Soft-Start s Open LED Protection s High Efficiency: 81% s Requires Only 0.22uF Output Capacitor s Low Profile (1mm) SOT-23 Packaging APPLICATION s Cellular Phones s PDAs, Handheld Computers s Digital Cameras s MP3 Players s GPS Receivers DESCRIPTIO The FSP3307 IS step-up DC/DC converters designed to drive up to six LEDs in series from a Li-Ion cell. Series connection of the LEDs provides identical LED currents and eliminates the need for ballast resistors. These devices integrate the Schottky diode required externally on competing devices. Additional features include output voltage limiting when LEDs are disconnected, onepin shutdown and dimming control. The FSP3307has internal soft-start. TheFSP3307switches at 1.2MHz, allowing the use of tiny external components. Constant frequency switching results in low input noise and a small output capacitor. Just 0.22µF is required for 4-, 6- or 8-LED applications. The FSP3307 is available in low profile(1mm)6-lead TYPICAL APPLICATION FSP3307 Figure 1. Li-Ion Powered Driver for Eight White LEDs EFFICIENCY (%) Conversion Efficiency 82 VIN = 3.6V 80 4 LEDs 78 76 74 72 70 68 66 64 62 60 0 5 10 15 LED CURRENT (mA) 20 1 ABSOLUTE MAXIMUM RATINGS (Note 1) Input Voltage (VIN) ................................................. 16V SW Voltage ............................................................. 36V FB Voltage ................................................................ 2V CTRL Voltage .......................................................... 10V Operating Temperature Range (Note 2) .. – 40°C to 85°C Maximum Junction Temperature ......................... 125°C Storage Temperature Range ................ – 65°C to 150°C Lead Temperature (Soldering, 10 sec)................. 300°C PACKAGE/ORDER INFORMATION TOP VIEW SW 1 GND 2 FB 3 6 IN 5 Vout 4 CTRL SOT-23-6 ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 3V, VCTRL = 3V, unless otherwise noted. PARAMETER Minimum Operating Voltage Maximum Operating Voltag Feedback Voltage FB Pin Bias Current Supply Current Switching Frequency Maximum Duty Cycle Switch Current Limit Switch VCESAT Switch Leakage Current VCTRL for Full LED Current VCTRL to Shut Down Chip CTRL Pin Bias Current Soft-Start Time Schottky Forward Drop Schottky Leakage Current CONDITIONS 0°C ≤ TA ≤ 85°C Not Switching CTRL = 0V ISW = 250mA VSW = 5V TA = 85°C TA = –40°C ID = 150mA VR = 30V q q Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The FSP3307are guaranteed to meet performance specifications from 0°C to 70°C. Specifications over the –40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls. MIN 2.7 188 10 1.9 2.0 0.8 90 225 1.8 48 40 60 TYP MAX UNITS V 16 V 200 212 mV 35 100 nA 2.6 3.3 mA 3.2 5.0 uA 1.2 1.6 MHz 93 % 340 mA 30 mV 0.01 5 uA V 50 mV 60 70 uA 50 60 uA 75 90 uA 600 µs 0.7 V 4 uA 2 SWITCH SATURATION VOLTAGE (mV) TYPICALA PERFORMANCE CHARACTERISTICS Switch Saturation Voltage (VCESAT) 450 TA = 25°C 400 350 300 250 200 150 100 50 0 0 50 100 150 200 250 300 350 SWITCH CURRENT (mA) FEEDBACK VOLTAGE (mV) VFB vs VCTRL 250 TA = 25°C 200 150 100 50 0 0 0.5 1 1.5 CONTROL VOLTAGE (V) 2 Switching Waveforms VSW 10V/DIV IL 100mA/DIV VOUT 100mV/DIV VIN = 3.6V 4 LEDs 20mA, 22µH 200ns/DIV OUTPUT CLAMP VOLTAGE (V) SCHOTTKY FORWARD CURRENT (mA) SWITCHING FREQUENCY (MHz) Schottky Forward Voltage Drop 300 TA = 25°C 250 200 150 100 50 0 0 200 400 600 800 1000 1200 SCHOTTKY FORWARD DROP (mV) Open-Circuit Output Clamp Voltage 35 TA = 25°C 30 25 20 15 10 5 0 2 4 6 8 10 12 14 16 INPUT VOLTAGE (V) Switching Frequency 3.0 2.5 2.0 1.5 1.0 0.5 0 –50 0 50 100 TEMPERATURE (°C) INPUT CURRENT (mA) IQ (µA) Shutdown Quiescent Current (CTRL = 0V) 30 TA = 25°C 27 24 21 18 15 12 9 6 3 0 2 4 6 8 10 12 14 VIN (V) 16 Input Current in Output Open Circuit 5 TA = 25°C 4 3 2 1 0 2 2.5 3 3.5 4 4.5 5 INPUT VOLTAGE (V) 3 TYPICAL PERFORMANCE CHARACTERISTICS FEEDBACK VOLTAGE (mV) Feedback Voltage 210 208 206 204 202 200 198 196 194 192 190 –50 –30 –10 10 30 50 70 TEMPERATURE (°C) 90 IQ (mA) Quiescent Current (CTRL = 3V) 3.0 2.5 2.0 1.5 1.0 0.5 0 0 –50°C 25°C 100°C 5 10 15 VIN (V) 20 CURRENT LIMIT (mA) Switching Current Limit 400 350 300 250 200 150 100 50 0 0 –50°C 25°C 100°C 20 40 60 80 DUTY CYCLE (%) 100 EFFICIENCY (%) VIN = 3.6V, 4 LEDs 85 80 20mA 75 15mA 10mA 70 65 60 –50 0 50 TEMPERATURE (°C) 100 SCHOTTKY LEAKAGE CURRENT (µA) Schottky Leakage Current 8 7 VR = 25 6 VR = 16 5 VR = 10 4 3 2 1 0 –50 0 50 100 TEMPERATURE (°C) PIN FUNCTIONS VOUT (Pin 1): Output.


LN6206 FSP3307 ATJ2063


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