FAN5331 ONSEMI | Alldatasheet
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©2004 Fairchild Semiconductor Corporation www.fairchildsemi.com August 2005 FAN5331 Rev. 1.0.1 FAN5331 High Efficiency Serial LED Driver and OLED Supply with 20V Integrated Switch FAN5331 High Efficiency Serial LED Driver and OLED Supply with 20V Integrated Switch
Features
1.6MHz Switching Frequency Low Noise Low R DS(ON) : 0.5 Ω 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
Description
The FAN5331 is a general purpose, fixed-frequency boost con- verter designed to operate at high switching frequencies in order to minimize switching noise measured at the battery ter- minal of hand-held communications equipment. Quiescent cur- rent 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 cur- rent limit circuit keeps the peak current of the switch below a typical value of 1A. The FAN5331 is available in a 5-lead SOT - 23 package. Typical Application Figure 1. Typical Application Diagram
Figure 2. Pin Assignment
- Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This
extended periods may affect device reliability. Absolute maximum ratings apply individually only, not in combination.
- Using EIA/JESD22A114B (Human Body Model) and EIA/JESD22C101-A (Charge Device Model).
- This load capacitance value is required for the loop stability. Tolerance, temperature variation, and voltage
2 GND Analog and power ground. 3F BF eedback node that connects to an external voltage divider. 4 SHDN Shutdown control pin. Logic HIGH enables, logic LOW disables the device.
www.fairchildsemi.com FAN5331 Rev. 1.0.1 FAN5331 High Efficiency Serial LED Driver and OLED Supply with 20V Integrated Switch Typical Performance Characteristics T A = 25°C, Test Circuit Figure 3, unless otherwise noted. -50 0 50 100 150 1.21 1.22 1.23 1.24 1.25 Temperatu re ( °C) vs Vf (Vin=2.7 V, Iload=15mA) Temperatu re ( °C) vs Vf (Vin=3.6 V, Iload=15mA) Temperatu re ( °C) vs Vf (Vin=5.5 V, Iload=15mA) 14.86 14.88 14.90 14.92 14.94 14.96 14.98 VIN(V) vs VOUT(V) at Iload=0mA VIN(V) vs VOUT(V), at load=10mA VIN(V) vs VOUT(V), at load=20mA VIN(V) vs VOUT(V) at Iload=30mA VIN(V) vs VOUT(V) at Iload=40mA VIN(V) vs VOUT(V) at Iload=50mA Output Voltage vs Input Voltage Output Voltage (V) Input Voltage (V) 0.72 0.74 0.76 0.78 0.80 0.82 0.84 0.86 0.88 0.90 0.92 VIN(V) vs Efficiency at Iload =10mA VIN(V) vs Efficiency at Iload =20mA VIN(V) vs Efficiency at Iload =30mA VIN(V) vs Efficiency at Iload =40mA VIN(V) vs Efficiency at Iload =50mA Efficiency Input Voltage (V) Efficiency vs Input Voltage 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Supply Current vs Input Voltage Supply Current (mA) Input Voltage (V) Switching Non Switching -40 -20 0 20 40 6 08 0 100 12 01 4 0 1.0 1.2 1.4 1.6 1.8 Switching Frequency (MHz) Ambient Temperature (°C) Switching Frequency vs Ambient Temperature IOUT = 15mA VOUT = 15V VIN = 3.6V Feedback Voltage vs Ambient Temperature IOUT = 15mA Ambient Temperature (°C) Feedback Voltage (V) 100 150 200 250 300 IOUT = 0mA 120 150 180 210 Maximum Load Current vs Input Voltage Maximum Load Current (mA) Input Voltage (V) VOUT = 12V VOUT = 15 V VOUT = 21V
www.fairchildsemi.com FAN5331 Rev. 1.0.1 FAN5331 High Efficiency Serial LED Driver and OLED Supply with 20V Integrated Switch Typical Performance Characteristics (Contd.) T A = 25°C, Test Circuit Figure 3, unless otherwise noted. Time (20µs/div) (5V/div) Startup After Enable Time (200µs/div) RL = 300Ω VIN = 3V (200mA/div) VOUT = 15V Inductor Current= 0mA Line Transient Response Time (100µs/div) Output Voltage Input Voltage -0.6V +0.6V VIN = 4.2V VIN = 3.2V Load Transient Response IOUT = 30mA Tr = Tf = 10µS VOUT = 15V Tr = Tf < 1µS VOUT = 15V IOUT = 0 to 35mA (10mA/Div) (100mV/Div) Output Power Spectral Density VIN = 3.6V IOUT = 35mA
Figure 4. Block Diagram oscillator sets the latch, and the latch turns on the FET switch. the latch and turns off the FET, thus terminating the pulse. adjusted to maintain regulation. turns off the switch instantaneously within each clock cycle. sistor, thus preventing the output voltage from going higher.
RMS, for load currents up to 40mA. if the load is accidently disconnected during operation. charge pump (C1, C2, D2, and D3). Figure 7. Dual (±) Boost Converter
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