FP6190 1.2A, 23V, 1.4MHz Step-Down Converter General Description The FP6190 is a buck regulator with a built-in internal power MOSFET. It can provide 1.2A continuous output current over a wide input supply range with excellent load and line regulation. Current mode operation provides fast transient response and eases loop stabilization. This device includes cycle-by-cycle current limiting and thermal shutdown protection. Internal soft-start reduces the stress on the input source at power-on. The FP6190 requires a minimum number of readily available external components to complete a 1.2A buck regulator solution. Features 1.2A Output Current 0.35Ω Internal High Side Power MOSFET Switch Stable with Low ESR Output Ceramic Capacitors Up to 92% Efficiency 0.1μA Shutdown Mode Current Fixed 1.4MHz Frequency Thermal Shutdown Cycle-by-Cycle Over Current Protection Wide 4.75 to 23V Operating Input Range Output Adjustable From 0.81 to 15V Available in TSOT23-6L / SOT23-6L Packages Applications Distributed Power Systems Battery Charger Pre-Regulator for Linear Regulators DSL Modems 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. Rev. 0.61 Website: http://www.feeling-tech.com.tw 1/13 FP6190 Function Block Diagram IN Internal Regulator Slope Compensation Current Sense 5V EN Enable Control BS Oscillator 1.4MHz/460KHz SW Control Logic UVLO Current Comparator Compensation 0.4V GND Frequency Foldback Comparator 0.8V Error Amplifier SS FB 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. 0.61 2/13 FP6190 Pin Descriptions TSOT23-6L / SOT23-6L Name No. I / O Description AK962 BS 1 P Bootstrap GND 2 P IC Ground FB 3 I Error Amplifier Compensation Output EN 4 I Enable / UVLO IN 5 P Supply Voltage SW 6 O Switch Marking Information TSOT23-6L / SOT23-6L AK962 Lot Number Year Part Number Code 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 “AK”. 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. 0.61 3/13 FP6190 Ordering Information Operating Temperature Package MOQ Description FP6190hR-G1 Part Number -40°C ~ +85°C TSOT23-6L 3000EA Tape & Reel FP6190LR-G1 -40°C ~ +85°C SOT23-6L 3000EA Tape & Reel Absolute Maximum Ratings Parameter Symbol Conditions Min. Typ. Max. Unit Supply Voltage VIN -0.3 26 V Supply Voltage Vsw -1 VIN +0.3 V Bootstrap Voltage VBS Vsw -0.3 Vsw +6 V -0.3 6 V +150 °C +150 ℃ All Other Pins Junction Temperature TJ Storage Temperature TS Thermal Resistance Thermal Resistance -65 θJA TSOT23-6L 220 ℃/W θJC TSOT23-6L 110 ℃/W θJA SOT23-6L 220 ℃/W θJC SOT23-6L 110 ℃/W +85 ℃ +260 ℃ Operating Temperature -40 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. 0.61 4/13 FP6190 Recommended Operating Conditions Parameter Supply Voltage Symbol Conditions VIN Operating Temperature Ambient Temperature Min. Typ. Max. Unit 4.75 23 V -40 85 °C DC Electrical Characteristics (VIN=12V, TA= 25°C, unless otherwise noted) Parameter Symbol Test Conditions ISB VEN=2V, VFB=1.0V Shutdown Supply Current IST VEN=0 Feedback Voltage VFB 4.5V<VIN<24V Feedback Current IFB VFB=0.8V Switch ON Resistance RON Standby Current Switch Leakage Current IIL Current Limit ICL Oscillation Frequency fOSC Short Circuit Oscillation Frequency fSC Min. 0.78 Typ. Max. Unit 0.8 1.0 mA 0.1 1.0 µA 0.8 0.82 V 0.1 µA 0.35 Ω VEN=0, VSW=0V 10 1.5 1.2 VFB=0V 1.4 µA A 1.7 460 MHz KHz Maximum Duty Cycle DMAX VFB=0.6V 87 % Minimum On Time TON VFB=1.5V 100 ns VUVLO VEN Rising Under Voltage Lockout Threshold Under Voltage Lockout Threshold Hysteresis 2.5 2.8 3.1 150 VHYS EN Input Low Voltage mV 0.4 EN Input High Voltage 1.2 EN Input Current IEN Thermal Shutdown TTS V V V VEN=2V 2.1 VEN=0V 0.1 150 µA °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. 0.61 5/13 FP6190 Function Description The FP6190 is a current-mode step-down DC / DC converter that provides excellent transient response with no extra external compensation components. It regulates input voltages from 4.5V to 24V down to an output voltage as low as 0.81V with maximum 1.2A load current. and operates at a high 1.4MHz operating frequency to ensure a compact, high-efficiency design with excellent AC and DC performance.The output voltage is measured at FB pin through a resistive voltage divider and amplified by the internal error amplifier. The converter uses an internal n-channel MOSFET switch to step-down the input voltage to the regulated output voltage. Since the n-channel MOSFET requires a gate voltage greater than the input voltage, a boost capacitor connected between SW and BS drives the MOS gate. The capacitor is internally charged while the MOS switch is off. Output Voltage (VOUT) The output voltage is set using a resistive voltage divider from the output voltage to FB. The voltage divider divides the output voltage down by the ratio: VFB VOUT R2 R1 R2 Thus the output voltage is: VOUT VFB R1 R2 R2 Enable Mode / Shutdown Mode Drive EN Pin to ground to shut down the FP6190. Shutdown mode forces the internal power MOSFET off, turns off all internal circuitry, and reduces the VIN supply current to 0.1μA (typ.). The EN Pin rising threshold is 1.0V (typ.). Before any operation begins, the voltage at EN pin must exceed 1.0V (typ.). The EN pin input has 100mV hysteresis. Boost High-Side Gate Drive (BST) Since the MOSFET requires a gate voltage greater than the input voltage, user should connect a flying bootstrap capacitor between SW and BS pin to provide the gate-drive voltage to the high-side n-channel MOSFET switch. The capacitor is charged by the internally regulator periodically when SW pin is pulled to ground. During startup, an internal low-side switch pulls SW to ground and charges the BST capacitor to internally regulator output voltage. Once the BST capacitor is charged, the internal low-side switch is turned off and the BST capacitor provides the necessary enhancement voltage to turn on the high-side switch. 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. 0.61 6/13 FP6190 Thermal Shutdown Protection The FP6190 features integrated thermal shutdown protection. Thermal shutdown protection limits allowable power dissipation (PD) in the device and protects the device in the event of a fault condition. When the IC junction temperature exceeds +150°C, an internal thermal sensor signals the shutdown logic to turn off the internal power MOSFET and allow the IC cooling down. The thermal sensor turns the internal power MOSFET back on after the IC junction temperature cools down to + 110°C, resulting in a pulsed output under continuous thermal overload conditions. 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. 0.61 7/13 FP6190 Application Information Input Capacitor Selection The input current to the step-down converter is discontinuous, therefore a capacitor is required to supply the AC current to the step-down converter while maintaining the DC input voltage. Use low ESR capacitors for the best performance. Ceramic capacitors are preferred, but tantalum or low-ESR electrolytic capacitors may also suffice. The input capacitor can be electrolytic, tantalum or ceramic. When electrolytic or tantalum capacitors are used, a small, high quality 0.1μF ceramic capacitor should be placed beside the IC as possible. When using ceramic capacitors, make sure that they have enough capacitance to provide sufficient charge to prevent excessive voltage ripple at converter input. The input voltage ripple can be estimated by C IN IO D(1 D) f VIN Inductor Selection The inductor is required to supply constant current to the output load while being driven by the switched input voltage. A larger value inductor will result in less ripple current that will result in lower output ripple voltage. However, the larger value inductor will have a larger physical size, higher series resistance, and/or lower saturation current. A good rule for determining the inductance to use is to allow the peak-to-peak ripple current in the inductor to be approximately 30% of the maximum switch current. Also, make sure that the peak inductor current is below the maximum switch current limit. The inductance value can be calculated by L VO VD (1 D) IO f Where r is the ripple current ratio RMS current in inductor ILrms IO 1 2 12 Output Capacitor Selection The output capacitor is required to maintain the DC output voltage. Ceramic, tantalum, or low ESR electrolytic capacitors are recommended. Low ESR capacitors are preferred to keep the output voltage ripple low. The output voltage ripple can be estimated by: 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. 0.61 8/13 FP6190 VOUT VOUT VIN VOUT 1 ESR f L VIN 8 f C OUT In the case of ceramic capacitors, the output ripple is dominated by the capacitance value because of its low ESR. In the case of tantalum or electrolytic capacitors, the capacitor high ESR dominates the output ripple. Followings are equations for determining appropriate capacitor parameters. Ⅰ. Ceramic capacitors: choose capacitance value C OUT VOUT 2 8 f L VOUT V 1 OUT VIN Ⅱ. Tantalum or electrolytic capacitors: choose capacitor with ESR value ESR VOUT f L VIN VOUT VIN VOUT PC Board Layout Checklist 1. The power traces, consisting of the GND, SW and VIN traces, should be kept short, direct and wide. 2. Place CIN near IN pin as closely as possible to maintain input voltage steady and filter out the pulsing input current. 3. The resistive divider R1 and R2 must be connected directly to FB pin as closely as possible. 4. FB is a sensitive node. Please keep it away from switching node SW. A good approach is to route the feedback trace on another layer and have a ground plane between the top and feedback trace routing layer. This reduces EMI radiation on to the DC-DC converter’s own voltage feedback trace. 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. 0.61 9/13 FP6190 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. Website: http://www.feeling-tech.com.tw Rev. 0.61 10/13 FP6190 Typical Application VIN 12V C1 10µF C3 10nF VOUT 3.3V L1 4.7µH 1 BST SW 6 FP6190 2 3 GND FB IN EN R1 49.9K 5 D1 SK34 4 C2 22µF R2 16.2K 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. Website: http://www.feeling-tech.com.tw Rev. 0.61 11/13 FP6190 Package Outline TSOT23-6L Unit: mm Symbols Min. (mm) Max. (mm) A 0.750 0.800 A1 0.000 0.050 A2 0.700 0.775 b 0.350 0.500 c 0.100 0.200 D 2.800 3.000 E 2.600 3.000 E1 1.500 1.700 e 0.950 BSC e1 1.900 BSC L 0.370 0.600 L1 0.600 REF L2 0.250 BSC R 0.100 R1 0.100 0.250 θ° 0° 8° θ1 4° 12° Note: 1. Dimension “D” does not include molding flash, protrusions or gate burrs. 2. 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. 0.61 12/13 FP6190 SOT23-6L Unit: mm 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° 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. 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. 0.61 13/13