FP6290 Low-Noise Step-Up Current Mode PWM Converter General Description The FP6290 is a current mode boost DC-DC converter. Its PWM circuitry with built-in 0.2Ω power MOSFET makes this converter highly power efficiently. Selectable high switching frequency allows faster loop response and easy filtering with a low noise output. The non-inverting input its error amplifier is connected to an internal 1.24V precision reference voltage. Soft-Start time can be programmed with an external capacitor, which sets the input current ramp rate. Current mode control and external compensation network make it easy and flexible to stabilize the system. The FP6290 is available in the MSOP-8L package. Combined with low ESR capacitors, it reduced PCB space for step-up applications. Features Adjustable Output from VCC to 12V Internal Fixed PWM Frequency: 640KHz / 1.2MHz Frequency Selection Pin Precision Feedback Reference Voltage: 1.24V Internal 0.2Ω, 1.6A, 14V Power MOSFET External Programmable Soft-Start Function (SS) Shutdown Current : 0.1µA Over Current Protection Package: MSOP-8L Applications LCD Display Digital Camera Handheld Device Portable Product Typical Application Circuit VOUT / 9.2V VIN / 3~3.6V D SM340A 6 3 LX VCC 5 FB 2 FREQ 7 SS 8 EN FP6290 1 4 COMP GND + 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. Rev. 0.6 Website: http://www.feeling-tech.com.tw 1/12 FP6290 Function Block Diagram 2 3 LX EN 4µA BIAS SOFT START 4 SS Power ON / OFF + 8 COMP 1 FB + 7 FREQ + Error Amp. 1.24V OSCILLATOR SLOPE COMPENSATION PWM Comp. CONTROL AND DRIVER LOGIC LX 5 + Σ 6 GND Current Sense Amp. 5μA 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. 0.6 2/12 FP6290 Pin Descriptions MSOP-8L Name No. I / O Description FP6290 COMP 1 O Error Amplifier Compensation Output FB 2 I Error Amplifier Inverting Input EN 3 I Enable Control GND 4 P IC Ground LX 5 O Switch Output VCC 6 P IC Power Supply FREQ 7 O Frequency Selection SS 8 I Soft-start Control IC Date Code Identification MSOP-8L FP6290 Halogen Free Lot Number Internal ID Per-Half Month Year 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: January → A (Front Half Month), B (Last Half Month) February → C (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. 0.6 3/12 FP6290 Ordering Information Part Number Operating Temperature Package MOQ Description -40°C ~ +85°C MSOP-8L 2500EA Tape & Reel FP6290TR-LF Absolute Maximum Ratings Parameter Supply Voltage Symbol Conditions Min. VCC RMS LX Current Typ. Max. Unit 6 V 1.2 A LX to GND -0.3 14 V SS,COMP to GND -0.3 VCC+0.3 V EN,FREQ,FB to GND -0.3 VCC V +150 ℃ +150 ℃ 172 ℃/W 71 ℃/W +260 ℃ Junction Temperature TJ Storage Temperature TS Thermal Resistance θJA θJC -65 MSOP-8L Lead Temperature (soldering, 10 sec) Suggested 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. 0.6 4/12 FP6290 Recommended Operating Conditions Parameter Supply Voltage Symbol Conditions VIN Operating Temperature Min. Typ. Max. Unit 2.6 5.5 V -40 85 °C DC Electrical Characteristics (VIN=3V, TA= 25°C, VFREQ=0V, unless otherwise noted) Parameter Symbol Test Conditions Min. Typ. Max. Unit VREF △VREF / VREF COMP connected to FB 1.222 1.240 1.258 V Reference Section Output Voltage Line Regulation Output Voltage Change with Temperature VCC=2.6V～5.5V 0.05 %/V TA=-40℃ to 25℃ 1 % TA= 25℃ to 85℃ 1 % Under Voltage Lockout Section Upper Threshold Voltage (VCC) VUPPER Lower Threshold Voltage (VCC) VLOW Hysteresis (VCC) VHYS TA=25℃ 2.38 2.53 2.33 2.48 50 V V mV Soft-Start Section Reset Switch Resistance RSS Input Source Current ISS 100 Ω VSS=1.2V 1.5 4.0 7.0 μA FREQ=GND 540 640 740 KHZ FREQ=VCC 1.00 1.22 1.50 MHz Oscillator Section Frequency Frequency Change with Voltage Frequency Change with Temperature Maximum Duty Cycle f △f / △V VCC=2.6V to 5.5V 2 %/V △f / △V TA=-40℃ to 85℃ 10 % 88 % 88 % TDUTY FREQ=GND 79 FREQ=VCC Error–Amplifier Section FB Input Bias Current IBIAS VFB=1.24V Trans-conductance gm △I=5μA Voltage Gain Av 70 140 40 nA 240 μA / V 700 V/V Output Section NMOS Current Limit NMOS On Resistance Output Leakage Current Current-Sense Trans-Resistance ILIM VFB=1V,Duty Cycle=65% 1.2 1.6 2.3 A Ω RDS (ON) ILX=1.2A 0.2 0.5 ILXOFF VLX=12V 0.01 20 RCS 0.56 μA V/A 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. 0.6 5/12 FP6290 Parameter Symbol Test Conditions Min. Typ. Max. Unit Control Input Section Input High Voltage VIH Input Low Voltage VIL Hysteresis FREQ Pull-Down Current EN Input Current EN,FREQ pin VCC=2.6V~5.5V EN,FREQ pin VCC=2.6V～5.5V 0.3× VCC EN,FREQ IFREQ 0.1×VCC 1.8 IEN V 0.7×VCC 5 V V 9 1 μA nA Total Device Disable Supply Current IDISABLE EN=GND 0.1 10 μA Standby Supply Current ISBY VFB=1.3V 0.20 0.35 mA Average Supply Current IAVG VFB=1.0V 2.0 5.0 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. Website: http://www.feeling-tech.com.tw Rev. 0.6 6/12 FP6290 Typical Operating Characteristics (TA= 25°C, unless otherwise noted) NO-Load Supply Current vs. Input Voltage Efficiency vs. Output Current 0.35 100 NO-Load Supply Current(m A) 90 80 Efficiency (%) 70 60 640KHz 50 1.2MHz 40 30 VCC=3.3V VOUT=5V 20 10 0.3 0.25 0.2 640KHz 1.2MHz 0.15 0.1 VOUT=5V 0.05 0 0 1 10 100 2.5 1000 3 3.5 Efficiency vs. Output Current 5 5.5 12.2 90 12.1 80 60 Output Voltage (V) 70 Efficiency (%) 4.5 Output Voltage vs. Output Current 100 640KHz 50 1.2MHz 40 30 VCC=3.3V VOUT=12V 20 10 12 TA=-30℃ 11.9 TA=25℃ 11.8 TA=85℃ 11.7 Fosc=640KHZ 11.6 11.5 0 1 10 100 0 1000 20 40 60 90 1.6 80 1.4 Maximum Output Current (A) 1.8 70 60 640KHz 50 1.2MHz 40 30 VCC=5V VOUT=12V 10 100 120 140 160 180 200 Maximum Output Current vs. Input Voltage Efficiency vs. Output Current 100 20 80 Output Current (mA) Output Current (mA) Efficiency (%) 4 Input Voltage(V) Output Current (mA) Fosc=640KHZ 1.2 1 Vout=5V Vout=12V 0.8 0.6 0.4 0.2 0 0 1 10 100 3 1000 3.2 3.4 3.6 3.8 4 4.2 4.4 4.6 4.8 5 Input Voltage (V) Output Current (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. Website: http://www.feeling-tech.com.tw Rev. 0.6 7/12 FP6290 CH1=Inductor Current,CH3=EN,CH4=VOUT VCC=3.3V, VOUT=12V ILOAD=10mA~200mA Frequency=640KHz CH1=Inductor Current,CH4= VOUT VCC=3.3V, VOUT=12V ILOAD=10mA Frequency=640KHz CH1=Inductor Current,CH3=LX,CH4= VOUT AC-Coupled VCC=3.3V, VOUT=12V ILOAD=200mA Freq=1.2MHz CH1=Inductor Current,CH3=EN,CH4=VOUT VCC=3.3V, VOUT=12V ILOAD=200mA Freq=640KHz 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. 0.6 8/12 FP6290 Function Description Voltage Reference A 1.24V reference regulator supplies to the FP6290 error amplifier’s non-inverting terminal. Error Amplifier The error amplifier compares a sample of the dc-dc converter output voltage with the 1.24V (VREF) reference and generates an error signal for the PWM comparator. Output voltage of dc-dc converter is setting with the resistor divider by the following equation: R1 VOUT 1 1.24 R 2 VOUT T R1 Error Amplifier 2 1 R2 1.24V RCOMP FP6290 CCOMP Oscillator The switching frequency of FP6290 can be selected to operate at either 640KHz or 1.2MHz. Connect the FREQ pin to GND for 640KHz operation, or VCC for 1.2MHz operation. FREQ pin has an internal pull-down current around 5μA. It gives user the option of selecting 640KHz operation by leaving FREQ unconnected. Soft Start The soft start is functional after power on. The interval of soft start time is determined by a capacitor connected to SS pin. When EN pin is taken high, the soft start capacitor (CSS) is charged by a constant current of 4μA (typ). During this interval, the SS voltage directly controls the peak inductor current. The maximum load current is available after the soft-start interval is completed. Once the EN pin is taken low, the soft-start capacitor is discharged to ground to prepare for next start-up. 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. 0.6 9/12 FP6290 The load must wait for the soft-start interval to finish before drawing a significant amount of load current. The duration after which the load can begin to draw maximum load current is: TMAX 6.77 10 5 CSS EN The FP6290 can be turn off to reduce the supply current to 0.1μA when EN is low. In this mode, the internal reference, error amplifier, comparators, and biasing circuitry turn off while the N-channel MOSFET is turned off. The boost converter’s output is connected to VCC by the external inductor and catch diode. Output Current Capability The output current capability of the FP6290 is a function of current limit, input voltage, operation frequency, and inductor value. Because of the slope compensation used to stabilize the feedback loop, the duty cycle affects the current limit. The output current capability is governed by the following equation: IOUT(MAX) ILIM (1.26 0.4 Duty ) 0.5 Duty VIN /( fosc L ) VIN / VOUT Where: ILIM=current limit specified at 65% Duty=duty cycle= ( VOUT VIN VDIODE) VOUT ILIM RON VDIODE VDIODE=catch diode forward voltage at ILIM η=conversion efficiency,85%nominal Current Limitation The internal power-MOS switch current is monitored cycle-by-cycle and is limited to the value not exceed 1.6A (Typ.). When the switch current reaches the limited value, the internal power-MOS is turned off immediately until the next cycle. 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. 0.6 10/12 FP6290 Typical Application Figure 1 Typical Application Circuits VOUT / 27V D3 BAV99 / SOT-23L VOUT / -9.2V C11 0.1µF 2 1 3 3 C12 0.1µF C9 0.1µF C13 4.7µF C10 1µF 2 1 1 C8 1µF 3 2 D2 BAV99 / SOT-23L D4 BAV99 / SOT-23L VOUT / 9.2V VIN / 3~3.6V L1 4.7µF 6 3 D SM340A 5 VCC LX EN FB 2 FREQ 7 SS 8 R2 300K FP6290 C1 47µF 1 C2 0.1µF R1 7.5K 4 COMP GND + C6 47µF C7 0.1µF R3 47K C3 10pF C5 0.033µF C4 1500pF Figure 2 TFT Panel Power Supply Application Circuits 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. 0.6 11/12 FP6290 Package Outline MSOP-8L Unit: mm Symbols Min. (mm) Max. (mm) A 1.100 A1 0.000 0.150 A2 0.750 0.950 D 3.000 BSC E 4.900 BSC E1 3.000 BSC L 0.400 L1 θ° 0.800 0.950 REF 0° 8° Note: 1. Package dimensions are in compliance with JEDEC outline: MO-187 AA. 2. Dimension “D” does not include molding flash, protrusions or gate burrs. 3. Dimension “E1” does not include inter-lead flash or protrusions. 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. 0.6 12/12