FP6297 1MHz, 4A Step-Up Current Mode PWM Converter General Description The FP6297 is a current mode boost DC-DC converter. Its PWM circuitry with built-in 0.12Ω power MOSFET make this regulator highly power efficient. The internal compensation network also minimizes as much as 6 external component counts. The non-inverting input of error amplifier connects to a 0.6V precision reference voltage and internal soft-start function can reduce the inrush current. The FP6297 is available in the SOP-8(EP) package. Features Adjustable Output up to 12V Internal Fixed PWM frequency: 1.0MHz Precision Feedback Reference Voltage: 0.6V (±2%) Internal 0.12Ω, 4A, 18V Power MOSFET Shutdown Current: 0.1µA Over Temperature Protection Over Voltage Protection Adjustable Over Current Protection: 0.5A ~ 4.0A Package: SOP-8L Applications Chargers LCD Displays Digital Cameras Handheld Devices Portable Products Typical Application Circuit This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product. Website: http://www.feeling-tech.com.tw Rev. 0.60 1/8 FP6297 Function Block Diagram Pin Descriptions SOP-8L(EP) Name No. I / O Description FP6297 9Fa-86L PGND 1 P IC Ground OC 2 I Adjustable Current Limit (Floating Available) Vcc 3 P IC Power Supply EN 4 I Enable Control (Active High) GND 5 P IC Ground I Error Amplifier Inverting Input FB 6 NC 7 LX 8 O Power Switch Output EP 9 P Exposed PAD-Must connect to Ground NA Not Connected This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product. Website: http://www.feeling-tech.com.tw Rev. 0.60 2/8 FP6297 Marking Information SOP-8L(EP) Halogen Free: Halogen free product indicator. Lot Number: Wafer lot number’s last two digits. For Example: 132386TB 86 Internal ID: Internal Identification Code. Per-Half Month: Production period indicated in half month time unit. For Example: JanuaryA(Front Half Month),B(Last Half Month) FebruaryC(Front Half Month),D(Last Half Month) Year: Production year’s last digit This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product. Website: http://www.feeling-tech.com.tw Rev. 0.60 3/8 FP6297 Ordering Information Part Number Code Operating Temperature Package MOQ Description -40°C ~ 85°C SOP-8L(EP) 2500EA Tape & Reel FP6297XR-G1 Absolute Maximum Ratings Parameter Symbol Conditions Min. Typ. Max. Unit Supply Voltage VCC 0 6 V LX Voltage VLX 0 18 V 0 6 V EN,FB Voltage Thermal Resistance (Note1) Junction Temperature θJA SOP-8L(EP) +60 °C / W θJC SOP-8L(EP) +4 °C / W +150 °C TJ Operating Temperature TOP -40 +85 °C Storage Temperature TST -65 +150 °C +260 °C Lead Temperature (soldering, 10 sec) Note1: θJA is measured in the natural convection at TA=25°C on a low effective thermal conductivity test board of JEDEC 51-3 thermal measurement standard. IR Re-flow Soldering Curve This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product. Website: http://www.feeling-tech.com.tw Rev. 0.60 4/8 FP6297 Recommended Operating Conditions Parameter Symbol Supply Voltage VIN Operating Temperature Range TA Conditions Ambient Temperature Min. Max. Unit 2.6 Typ. 5.5 V -40 +85 °C DC Electrical Characteristics (VCC=3.3V, TA=25°C, unless otherwise specified) Parameter Symbol Conditions Min. Typ. Max. Unit 5.5 V System Supply Input Input Supply Range VCC Under Voltage Lockout 2.6 VUVLO UVLO Hysteresis 2.2 V 0.1 V Quiescent Current ICC VFB=0.66V, No switching 0.19 mA Average Supply Current ICC VFB=0.55V, Switching 2.84 mA Shutdown Supply Current ICC VEN=GND 0.1 µA FOSC VFB=1.0V Oscillator Operation Frequency Frequency Change with Voltage 0.8 △f / △V VCC=2.6V to 5.5V Maximum Duty Cycle TDUTY 1.0 1.2 MHZ 5 % 90 % Reference Voltage Reference Voltage VREF Line Regulation 0.588 0.6 0.612 0.2 VCC=2.6V～5.5V V %/V Enable Control Enable Voltage VEN Shutdown Voltage VEN 0.96 V 0.6 V MOSFET On Resistance of Driver RDS (ON) ILX=2A 0.12 Ω 4 A Protection OCP Current IOCP Adjustable OCP Current IOCP OTP Temperature TOTP With External Resistor： 12k~96k 4 0.5 +150 A °C This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product. Website: http://www.feeling-tech.com.tw Rev. 0.60 5/8 FP6297 Function Description Operation The FP6297 is a current mode boost converter. The constant switching frequency is 1MHz and operates with pulse width modulation (PWM). Build-in 18V / 4A MOSFET provides a high output voltage. The control loop architecture is peak current mode control; therefore slope compensation circuit is added to the current signal to allow stable operation for duty cycles larger than 50%. Soft Start Function Soft start circuitry is integrated into FP6297 to avoid inrush current during power on. After the IC is enabled, the output of error amplifier is clamped by the internal soft-start function, which causes PWM pulse width increasing slowly and thus reducing input surge current. Current Limit Program A resistor between OC and GND pin programs peak switch current. The resistor value should be between 12k and 96k. The current limit will be set from 4A to 0.5A. Keep traces at this pin as short as possible. Do not put capacitance at this pin. To set the over current trip point according to the following equation: IOCP = 48000 R3 Over Temperature Protection (OTP) FP6297 will turn off the power MOSFET automatically when the internal junction temperature is over 150°C. The power MOSFET wake up when the junction temperature drops 30°C under the OTP threshold temperature. Over Voltage Protection (OVP) In some condition, the resistive divider may be unconnected, which will cause PWM signal to operate with maximum duty cycle and output voltage is boosted higher and higher. The power MOSFET will be turned off immediately, when the output voltage exceeds the OVP threshold level. The FP6297’s OVP threshold is 16V. This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product. Website: http://www.feeling-tech.com.tw Rev. 0.60 6/8 FP6297 Application Information Inductor Selection Inductance value is decided based on different condition. 3.3uH to 4.7µH inductor value is recommended for general application circuit. There are three important inductor specifications, DC resistance, saturation current and core loss. Low DC resistance has better power efficiency. Also, it avoid inductor saturation which will cause circuit system unstable and lower core loss at 1 MHz. Capacitor Selection The output capacitor is required to maintain the DC voltage. Low ESR capacitors are preferred to reduce the output voltage ripple. Ceramic capacitor of X5R and X7R are recommended, which have low equivalent series resistance (ESR) and wider operation temperature range. Diode Selection Schottky diodes with fast recovery times and low forward voltages are recommended. Ensure the diode average and peak current rating exceed the average output current and peak inductor current. In addition, the diode’s reverse breakdown voltage must exceed the output voltage. Output Voltage Programming The output voltage is set by a resistive voltage divider from the output voltage to FB. The output voltage is: R1 VOUT = 0.6 V 1 + R 2 Layout Considerations 1. The power traces, consisting of the GND trace, the LX trace and the VCC trace should be kept short, direct and wide. 2. LX、L and D switching node, wide and short trace to reduce EMI. 3. Place CIN near VCC pin as closely as possible to maintain input voltage steady and filter out the pulsing input current. 4. The resistive divider R1and R2 must be connected to FB pin directly as closely as possible. 5. FB is a sensitive node. Please keep it away from switching node, LX. 6. The GND of the IC, CIN and COUT should be connected close together directly to a ground plane. This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product. Website: http://www.feeling-tech.com.tw Rev. 0.60 7/8 FP6297 Typical Application General Boost Converter This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product. Website: http://www.feeling-tech.com.tw Rev. 0.60 8/8