fp6189v062-g1

FP6189 3A, 23V, 385KHz Step-Down 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. 0.62 1/14 General Description The FP6189 is a buck regulator with a built-in internal power MOSFET. It can provide 3A 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. The device includes cycle-by-cycle current limiting and thermal shutdown protection. Adjustable soft-start reduces the stress on the input source during power-on. The regulator only consumes 20μA supply current in shutdown mode. The FP6189 requires a minimum number of readily available external components to complete a 3A buck regulator solution. Features  3A Output Current  Adjustable Soft-Start  0.1Ω Internal High Side Power MOSFET Switch  Stable with Low ESR Output Ceramic Capacitors  Up to 95% Efficiency  20μA Shutdown Mode Current  Fixed 385KHz Frequency  Thermal Shutdown  Cycle-by-Cycle Over Current Protection  Wide 4.75 to 23V Operating Input Range  Output Adjustable From 0.92V to 21V  Available SOP-8L (EP)  Under Voltage Lockout Applications  Distributed Power Systems  Battery Charger  Pre-Regulator for Linear Regulators Typical Application Circuit FP6189 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. 0.62 2/14 Function Block Diagram Pin Descriptions SOP-8L (EP) Name No. I / O Description BS 1 O Bootstrap IN 2 P Supply Voltage SW 3 O Switch GND 4 P Ground FB 5 I Feedback COMP 6 O Compensation EN 7 I Enable / UVLO SS 8 O Programmable Soft Start EP 9 P Exposed PAD is GND FP6189 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. 0.62 3/14 Marking Information 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 FP6189 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. 0.62 4/14 Ordering Information Part Number Operating Temperature Package MOQ Description FP6189XR-G1 -40°C ~ +85°C SOP-8L (EP) 2500EA Tape & Reel Absolute Maximum Ratings Parameter Symbol Conditions Min. Typ. Max. Unit IN pin Supply Voltage VIN -0.3 24 V SW pin Voltage VSW -1 VIN +0.3 V BS pin Voltage VBS VSW-0.3 VSW +6 V All Other Pins -0.3 6 V Junction to Ambience Thermal Resistance θJA SOP-8L (EP) 60 °C / W Junction to Case Thermal Resistance θJC SOP-8L (EP) 10 °C / W Junction Temperature TJ -65 150 °C Storage Temperature -65 150 °C Operating Temperature -40 85 °C Lead Temperature (soldering, 10 sec) SOP-8L 260 °C IR Re-flow Soldering Curve FP6189 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. 0.62 5/14 Recommended Operating Conditions Parameter Symbol Conditions Min. Typ. Max. Unit Supply Voltage VIN 4.75 23 V Operating Temperature -40 85 °C DC Electrical Characteristics (VIN=12V, TA= 25°C, unless otherwise noted) Parameter Symbol Conditions Min. Typ. Max. Unit Shutdown Supply Current lST VEN=0 20 30 µA Supply Current ICC VEN=2.6V, VFB=1.4V 1 1.2 mA Feedback Voltage VFB VIN=12V, VCOMP<2V 0.892 0.92 0.948 V Error Amplifier Voltage Gain GEA 400 V / V Error Amplifier Trans- conductance △IC=±10µA 500 800 µA / V High Side Switch ON Resistance RON-HS 0.1 Ω Low Side Switch ON Resistance RON-LS 10 Ω High Side Switch Leakage Current IIL VEN=0V, VSW=0V 0.1 10 µA Current Limit ICL 5.5 A Current Sense to COMP Tran-conductance 4.4 A / V Oscillation Frequency FOSC 335 385 435 KHz Short Circuit Oscillation Frequency VFB=0V 40 64 88 KHz Maximum Duty Cycle VFB=1.0V 90 % Minimum Duty Cycle VFB=1.5V 0 % Under Voltage Lockout Threshold VUVLO VEN Rising 2.37 2.54 2.71 V Under Voltage Lockout Threshold Hysteresis VHYS 210 mV EN Threshold Voltage VEN 0.9 1.2 1.5 V EN Pin Pull Up Current IEN VEN=0V 1.1 1.8 3 µA Soft Start Period VSS CSS=0.1 µF 10 ms Thermal Shutdown TTS 150 °C FP6189 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. 0.62 6/14 Typical Operating Characteristics (VIN=12V, VOUT=3.3V, TA= 25°C, unless otherwise noted) Figure 1 Power on Figure 3 EN Pin Enable Figure 5 Load 3A Ripple Figure 2 Power off Figure 4 EN Pin Disable Figure 6 Load Step VIN VOUT IL SW VIN VOUT IL SW EN VOUT IL SW EN VOUT IL SW VOUT IL SW VOUT IL ILOAD=0.4A ILOAD=2A FP6189 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. 0.62 7/14 60 65 70 75 80 85 90 95 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 A % 2.5V 3.3V 5V Figure 7 Efficiency (VIN=7V) 60 65 70 75 80 85 90 95 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2A % 2.5V 3.3V 5V Figure 8 Efficiency (VIN=10V) FP6189 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. 0.62 8/14 Function Description The FP6189 is a current-mode buck regulator. It regulates input voltages from 4.75V to 23V down to an output voltage as low as 0.92V with maximum 3A load current. The FP6189 uses current-mode control to regulate the output voltage. The output voltage is measured at FB pin through a resistive voltage divider and amplified by the internal error amplifier. The output current of the trans-conductance error amplifier is presented at COMP pin where a network compensates the regulation control system. The voltage at COMP pin is compared to the switch current measured internally to control the output voltage. 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 pins is needed to drive the MOS gate. The capacitor is internally charged while the MOS switch is off. Another internal built-in 10Ω switch from SW to GND is used to insure that SW is pulled to GND when the switch is off to fully charge the BS pin capacitor. 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: 42 4 OUTFB RR R VV  Thus the output voltage is: 4 42 FBOUT R RR VV  A typical value for R4 can be as high as 100k, but a typical value is 10K. Enable Mode / Shutdown Mode Drive EN pin to ground to shut down the FP6189. Shutdown mode forces the internal power MOSFET off, turns off all internal circuitry, and reduces the VIN supply current to 20μA (typ.). The EN pin rising threshold is 1.2V (typ.). Before any operation begins, the voltage at EN pin must exceed 1.2V (typ.). The EN pin input has a 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 FP6189 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. 0.62 9/14 pin is pulled to ground. During startup, an internal low-side switch pulls SW pin 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. Thermal Shutdown Protection The FP6189 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. FP6189 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. 0.62 10/14 Application Information Input Capacitor Selection The input current of 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 close 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 )D1(D Vf I C IN O IN  Inductor Selection The inductor is required to supply 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 )D1( fI VV L O DO   Where γis the ripple current ratio RMS current in inductor 12 1II 2 OLrms  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: FP6189 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. 0.62 11/14         OUTIN OUTINOUT OUT Cf8 1ESR VLf VVV V 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      IN OUT OUT 2 OUT OUT V V 1 VLf8 V C Ⅱ. Tantalum or electrolytic capacitors: choose capacitor with ESR value  OUTINOUT INOUT VVV VLfV ESR   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 R2 and R4 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. FP6189 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. 0.62 12/14 Suggested Layout FP6189 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. 0.62 13/14 Typical Application FP6189 BS IN GND SS FB VIN 12V EN SW COMP C6 220µF C8 0.1µF 1 2 3 C1 10nF 4 C4 470µF R2 16K VOUT 3.3V R4 6.2K 5 6 7 8 C11 22nF R3 10K C10 4.7nF C9 510pFD1 SM340A L1 10µH EN FP6189 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. 0.62 14/14 Package Outline SOP-8L (EP) UNIT: mm Exposed PAD Dimensions: Note: 1. Package dimensions are in compliance with JEDEC outline: MS-012 AA. 2. Dimension “D” does not include molding flash, protrusions or gate burrs. 3. Dimension “E” does not include inter-lead flash or protrusions. Symbols Min. (mm) Max. (mm) A 1.346 1.752 A1 0.050 0.152 A2 1.498 D 4.800 4.978 E 3.810 3.987 H 5.791 6.197 L 0.406 1.270 θ° 0° 8° Symbols Min. (mm) Max. (mm) E1 2.184 REF D1 2.971 REF