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FAN5331 Dataheets PDF



Part Number FAN5331
Manufacturers Fairchild Semiconductor
Logo Fairchild Semiconductor
Description High Efficiency Serial LED Driver and OLED Supply
Datasheet FAN5331 DatasheetFAN5331 Datasheet (PDF)

FAN5331 High Efficiency Serial LED Driver and OLED Supply with 20V Integrated Switch August 2005 FAN5331 High Efficiency Serial LED Driver and OLED Supply with 20V Integrated Switch Features ■ 1.6MHz Switching Frequency ■ Low Noise ■ Low RDS(ON): 0.5Ω ■ Adjustable Output Voltage ■ 1A Peak Switch Current ■ 1W Output Power Capability ■ Low Shutdown Current: <1µA ■ Cycle-by-Cycle Current Limit ■ Over-Voltage Protection ■ Fixed-Frequency PWM Operation ■ Internal Compensation ■ 5-lead SOT-23 Package.

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FAN5331 High Efficiency Serial LED Driver and OLED Supply with 20V Integrated Switch August 2005 FAN5331 High Efficiency Serial LED Driver and OLED Supply with 20V Integrated Switch Features ■ 1.6MHz Switching Frequency ■ Low Noise ■ Low RDS(ON): 0.5Ω ■ Adjustable Output Voltage ■ 1A Peak Switch Current ■ 1W Output Power Capability ■ Low Shutdown Current: <1µA ■ Cycle-by-Cycle Current Limit ■ Over-Voltage Protection ■ Fixed-Frequency PWM Operation ■ Internal Compensation ■ 5-lead SOT-23 Package Applications ■ Cell Phones ■ PDAs ■ Handheld Equipment ■ Display Bias ■ LED Bias Typical Application VIN 2.7V to 5.5V CIN 4.7µF 5 VIN Description The FAN5331 is a general purpose, fixed-frequency boost converter designed to operate at high switching frequencies in order to minimize switching noise measured at the battery terminal of hand-held communications equipment. Quiescent current in normal mode of operation as well as in shutdown mode is designed to be minimal in order to extend battery life. Normal mode of operation or shutdown mode can be selected by a logic level shutdown circuitry. The low ON-resistance of the internal N-channel switch ensures high efficiency and low power dissipation. A cycle-by-cycle current limit circuit keeps the peak current of the switch below a typical value of 1A. The FAN5331 is available in a 5-lead SOT23 package. L 10µH BAT54 SW 1 R1 VOUT COUT 4.7µF CF 120pF 3 FB FAN5331 ON OFF 4 SHDN 2 GND R2 ©2004 Fairchild Semiconductor Corporation FAN5331 Rev. 1.0.1 Figure 1. Typical Application Diagram 1 www.fairchildsemi.com FAN5331 High Efficiency Serial LED Driver and OLED Supply with 20V Integrated Switch Pin Assignment Top View SW GND FB VIN SHDN 5-Lead SOT-23 Figure 2. Pin Assignment Pin Description Pin No. 1 2 3 4 5 Pin Name SW GND FB SHDN VIN Pin Description Switching node. Analog and power ground. Feedback node that connects to an external voltage divider. Shutdown control pin. Logic HIGH enables, logic LOW disables the device. Input voltage. Absolute Maximum Ratings (Note1) Parameter VIN to GND FB, SHDN to GND SW to GND Lead Soldering Temperature (10 seconds) Junction Temperature Storage Temperature Thermal Resistance (ΘJA) Electrostatic Discharge Protection (ESD) Level (Note 2) HBM CDM Min -0.3 -0.3 -55 2.5 1 Max 6.0 VIN + 0.3 23 300 150 150 265 Unit V V V °C °C °C °C/W kV Recommended Operating Conditions Parameter Input Voltage Output Voltage Operating Ambient Temperature Output Capacitance (Note 3) Min 2.7 VIN -40 1.6 Typ 25 Max 5.5 20 85 Unit V V °C µF Notes: 1. Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Absolute maximum ratings apply individually only, not in combination. 2. Using EIA/JESD22A114B (Human Body Model) and EIA/JESD22C101-A (Charge Device Model). 3. This load capacitance value is required for the loop stability. Tolerance, temperature variation, and voltage dependency of the capacitance must be considered. Typically a 4.7µF ceramic capacitor is required to achieve specified value at VOUT = 15V. 2 www.fairchildsemi.com FAN5331 Rev. 1.0.1 FAN5331 High Efficiency Serial LED Driver and OLED Supply with 20V Integrated Switch Electrical Characteristics Unless otherwise noted, VIN = 3.6V, TA = -40°C to +85°C, Typical values are at TA = 25°C, Test Circuit, Figure 3. Parameter Switch Current Limit Load Current Capability Switch On-resistance Quiescent Current OFF Mode Current Shutdown Threshold Shutdown Pin Bias Current Feedback Voltage Feedback Pin Bias Current Feedback Voltage Line Regulation Switching Frequency Maximum Duty Cycle Enable Delay Power on Delay Switch Leakage Current Conditions VIN = 3.2V VOUT = 15V, VIN ≥ 2.7V VOUT = 15V, VIN ≥ 3.2V VIN = 5V VIN = 3.6V VSHDN = 3.6V, No Switching VSHDN = 3.6V, Switching VSHDN = 0V Device ON Device OFF VSHDN = 0V or VSHDN = 5.5V ILoad = 0mA 2.7V < VIN < 5.5V, ILOAD = 0mA VIN = 2.7V, IOUT = 35mA, VOUT = 15V VIN = 2.7V, IOUT = 35mA, VOUT = 15V No Switching, VIN = 5.5V Min. 0.7 35 50 1.5 1.205 1.15 87 Typ. 1 0.5 0.7 0.7 1.6 0.1 10 1.230 10 0.6 1.6 93 0.8 0.8 Max. 3.0 2 0.5 1.255 1.2 1.85 5 5 1 Units A mA mA Ω Ω mA mA µA V V nA V nA % MHz % mS mS µA Test Circuit VIN 2.7V to 5.5V CIN 4.7µF 5 VIN L 10µH SW 1 BAT54 R1 150KΩ VOUT COUT 4.7µF CF 120pF 3 FB FAN5331 ON OFF 4 SHDN 2 GND R2 13.4KΩ Figure 3. Test Circuit 3 www.fairchildsemi.com FAN5331 Rev. 1.0.1 FAN5331 High Efficiency Serial LED Driver and OLED Supply with 20V Integrated Switch Typical Performance Characteristics TA = 25°C, Test Circuit Figure 3, unless otherwise noted. Output Voltage (V) .


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