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Technical content
Features
Wide Supply Voltage Operating Range: 2.4 to 5.5V Precision Feedback Reference Voltage: 0.6V (±2%) Shutdown Current: <1μA Internal Fixed PWM frequency: 550KHz Internal Soft Start Function :7ms (SS) Over Current Protection Function (OCP) Over Voltage Protection Package: SOT23-6L Duty Cycle: PWM/PFM Switching Control Circuit (15%~90%)
Applications
Chargers LCD Displays Digital Cameras Handheld Devices Portable Products Typical Application Circuit FP5202 OC FB EXT EN GND VOUTVIN Vcc LOAD ON/OFF
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 . Function Block Diagram PWM Comp. Error Amp. Control and Driver Logic Oscillator EXT VCC EN UVLO Shutdown Circuitry FB 0.6V 550KHz Soft Start GND VRAMP OCP OC 0.1V Pin Descriptions SOT23-6L VCC EN OC FB AV986 Top View GND EXT Name No. I / O Description VCC 1 P IC Power Supply OC 2 I Adjustable Output Current Protection FB 3 I Error Amplifier Inverting Input EN 4 I Enable Control (Active High) GND 5 P IC Ground EXT 6 O External Transistor Connection Pin
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 . Marking Information SOT23-6L Lot Number Part Number Code Year AV986 Lot Number: Wafer lot number’s last two digits For Example: 132386TB 86 Year: Production year’s last digit Part Number Code: Part number identification code for this product. It should be always “AV”.
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 .
Ordering Information
Part Number Code Operating Temperature Package MOQ Description FP5202LR-G1 AV -25°C ~ 85°C SOT23-6L 3000EA Tape & Reel Absolute Maximum Ratings Parameter Symbol Conditions Min. Typ. Max. Unit Supply Voltage VCC 0 5.5 V EN,FB Voltage 0 5.5 V Power Dissipation PD SOT23-6L @TA=25°C 455 mW Thermal Resistance (Note1) θJA SOT23-6L +220 °C / W Junction Temperature TJ +150 °C Operating Temperature TOP -25 +85 °C Storage Temperature TST -65 +150 °C Lead Temperature (soldering, 10 sec) +260 °C 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 . Recommended Operating Conditions Parameter Symbol Conditions Min. Typ. Max. Unit Supply Voltage VCC 2.4 5.5 V Operating Temperature Range TA Ambient Temperature -25 +85 °C Parameter Symbol Conditions Min. Typ. Max. Unit System Supply Input Input Supply Range VCC 2.4 5.5 V Under Voltage Lockout VUVLO 2.1 V UVLO Hysteresis 0.1 V Quiescent Current ICC FB=1.0V, No switch 70 µA Shutdown Current ICC VEN=GND 0.1 µA Oscillator Operation Frequency fOSC VFB=0.6V 550 kHZ PFM Switching Duty Ratio % 15 % Maximum Duty Ratio % 90 % Soft-Start Time tSS Vcc=5V 7 ms Reference Voltage Feedback Voltage VREF Vcc=5V 0.588 0.6 0.612 V Enable Control Enable Voltage VEN 0.96 V Shutdown Voltage VEN 0.6 V External Transistor Connection current EXT Pin Output Current IEXTH -105 mA EXT Pin Output Current IEXTL 130 mA
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 . Function Description Operation The FP5202 is a voltage mode boost controller. It operates with pulse width modulation (PWM) at fixed 550kHz switching frequency . An internal resistive divider provides 0.6V reference for the error amplifier. The FP5202 changes to PFM mode when output is light load. It can increase efficiency, but PFM mode also increases output voltage ripple. Soft Start Function Soft start circuitry is integrated into FP 5202 to avoid inrush current during power on. After the IC is enabled, the output of error amplifier is clamped by t he internal soft -start function, which causes PWM pulse width increasing slowly and thus reducing input surge current. Over Current Protection The FP5202 provides an output current limit protection function . The circuit is shown in Figure 1. The output current limiting will be activated when the OC pin voltage is higher than 0.1V. To set the over current trip point, follow below equation: Roc 1.0=IOCP OC pin LOAD VOUT Roc 0.05Ω IL Figure1. OC pin circuit Shutdown Function Drive Enable pin to ground to shut down the FP5202. Shutdown mode forces to turn off all internal circuitry, and reduces the Vcc supply current to 0.1μA (typ). The Enable pin rising threshold is 0.96V (typ). Before any operation begins, the voltage at Enable pin must exceed 0.96V (typ).
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 .
Application Information
Inductance value is decided based on different condition. 3.3 uH to 4.7µH induct ance value is recommended for general application circuit. There are thre e important inductor specifications, DC resistance, saturation current and core loss. Low DC resistance has better power efficiency. Capacitor Selection The output capacitor is required to maintain the DC voltage during switching . 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: 2R 1R1V6.0VOUT
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 . Layout Considerations 1. The power traces, consisting of the GND trace, the MOS drain trace and the V CC trace should be kept short, direct and wide. 2. Layout switching node MOS drain, inductor and diode connection traces wide and short to reduce EMI. 3. Place CIN nearby VCC pin as closely as possible to maintain input voltage steady and filter out the pulsing input current. 4. The resistive divider R1 and R2 must be connected to FB pin directly and as closely as possible. 5. FB is a sensitive node. Please keep it away from switching node, MOS drain. 6. The GND of the IC, C IN and COUT should be connected close and together directly to a ground plane. 7. OC pin is a sensitive node. Roc must be connected to IC GND pin directly as closely as possible. 8. OC pin is not connected (floating) when OC function is disabled. Don’t connect to GND directly. 9. The output capacitor C2 and C3 should be connected close and together directly to the source of MOS. 1 6 3 4 LOAD Vout Vin GND VIA to GND VIA to Vin FP5202 Roc FB VIA to FB Suggested Layout
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 . 5V/2.1A VIN 3V~4.2V Vcc 22µF 22µF*2 D1 SM540A 88K 12K L1 3.3µH SOT23-6L Roc 0.047Ω LOAD ON/OFF Optional FP5202 OC FB EXT EN GND VOUT 5V/3A VIN 3V~4.2V Vcc 22µF 22µF*2 D1 SM540A*2 88K 12K L1 3.3µH SOT23-6L Roc 0.03Ω LOAD ON/OFF Optional 100µF Note: 1. C1 and C3 choose ceramic capacitor of X5R or X7R. 2. R3 and C5 are added for reducing EMI (Electromagnetic Interference).
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 . Package Outline SOT23-6L Unit: mm Note: 1. Package dimensions are in compliance with JEDEC outline: MO-178 AB. 2. Dimension “D” does not include molding flash, protrusions or gate burrs. 3. Dimension “E1” does not include inter-lead flash or protrusions. Symbols Min. (mm) Max. (mm) A 1.050 1.450 A1 0.050 0.150 A2 0.900 1.300 b 0.300 0.500 c 0.080 0.220 D 2.900 BSC E 2.800 BSC E1 1.600 BSC e 0.950 BSC e1 1.900 BSC L 0.300 0.600 L1 0.600 REF L2 0.250 BSC θ° 0° 8° θ1° 3° 7° θ2° 6° 15°