fp6167v067-lf

FP6167 Dual 1.5MHz, 1A Synchronous Step-Down Regulator 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. 0.67 1/14 General Description The FP6167 is a high efficiency current mode dual synchronous buck PWM DC-DC regulator. The internal generated 0.6V precision feedback reference voltage is designed for low output voltage. Low RDS(ON) synchronous switch dramatically reduces conduction loss. To extend battery life for portable application, 100% duty cycle is supported for low-dropout operation. Shutdown mode also helps saving the current consumption. The FP6167 is packaged in DFN-12L to reduce PCB space. Features  Input Voltage Range: 2.5 to 5.5V  Adjustable Output Voltage From 0.6V to VIN  Precision Feedback Reference Voltage: 0.6V (±2%)  Output Current: 1A (Max.) Each Channel  Duty Cycle: 0~100%  Internal Fixed PWM Frequency: 1.5MHz  Low Quiescent Current: 160μA  No Schottky Diode Required  Built-in Soft Start  Current Mode Operation  Over Temperature Protection  Package: DFN-12L Applications  Cellular Telephone  Wireless and DSL Modems  Digital Still Cameras  Portable Products  MP3 Players FP6167 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. 0.67 2/14 Typical Application Circuit Function Block Diagram FP6167 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. 0.67 3/14 Pin Descriptions DFN-12L EP Top View Bottom View EP VIN2 GND NC1 SW2 FB1 RUN2 FB2 SW1 NC2 GND RUN1 VIN1 Marking Information DFN-12L Name No. I / O Description VIN2 1 P Second Channel Power Supply SW2 2 O Second Channel Switch Output GND 3 P IC Ground FB1 4 I First Channel Feedback NC1 5 No Connect RUN1 6 I First Channel Enable Pin VIN1 7 P First Channel Power Supply SW1 8 O First Channel Switch Output GND 9 P IC Ground FB2 10 I Second Channel Feedback NC2 11 No Connect RUN2 12 I Second Channel Enable Pin EP 13 P Exposed PAD – connect to Ground 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 FP6167 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. 0.67 4/14 Ordering Information Part Number Operating Temperature Package MOQ Description FP6167dR-LF-ADJ -40°C ~ +85°C DFN-12L 2500EA Tape & Reel Absolute Maximum Ratings Parameter Symbol Conditions Min. Typ. Max. Unit Input Supply Voltage VIN -0.3 6 V RUN, VFB, SW Voltage -0.3 VIN V P-Channel Switch Source Current (DC) 1 A N-Channel Switch Source Current (DC) 1 A Peak SW Switch Sink and Source Current (AC) 2 A Thermal Resistance (Junction to Ambient) θJA DFN-12L +60 °C / W Thermal Resistance (Junction to Case) θJC DFN-12L +10 °C / W Junction Temperature +150 °C Storage Temperature -65 +150 °C Lead Temperature (soldering, 10 sec) DFN-12L +260 °C FP6167 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. 0.67 5/14 IR Re-flow Soldering Curve FP6167 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. 0.67 6/14 Recommended Operating Conditions Parameter Symbol Conditions Min. Typ. Max. Unit Supply Voltage VIN 2.5 5.5 V Operating Temperature -40 +85 °C DC Electrical Characteristics (TA= 25°C, VIN=3.6V, unless otherwise noted) Parameter Symbol Conditions Min. Typ. Max. Unit TA=25°C 0.588 0.6 0.612 V Regulated Feedback Voltage VFB -40°C~+85°C 0.585 0.6 0.615 V Line Regulation with VREF VFB VIN=2.5V to 5.5V 0.04 0.4 % / V Output Voltage LineRegulation VOUT VIN=2.5 to 5.5V 0.04 0.4 % / V RDS (ON) of P-Channel FET RDS (ON) P ISW=100mA 0.28 0.35 Ω RDS (ON) of N-Channel FET RDS (ON) N ISW =-100mA 0.25 0.32 Ω SW Leakage ILSW VRUN=0V, VIN=5V ±0.01 ±1 µA Peak Inductor Current IPK VFB=0.5V 1.125 1.875 A Input Voltage Range VIN 2.5 5.5 V Shutdown, VRUN=0V 0.1 1 µA Active, VFB=0.5V, VRUN=VIN 200 µA Quiescent Current ICC PFM, VFB=0.7V, VRUN=VIN 160 µA RUN Threshold VRUN 0.3 1 V RUN Leakage Current IRUN ±0.01 ±1 µA Oscillator Frequency FOSC VFB=0.6V 1.2 1.8 MHz FP6167 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. 0.67 7/14 Typical Operating Characteristics (VIN=3.6V,TA= 25°C, unless otherwise noted) Supply Current vs. VIN 120 122 124 126 128 130 132 134 136 138 140 2 2.5 3 3.5 4 4.5 5 5.5 6 VIN (V) S up pl y C ur re nt (u A ) 85℃ 25℃ -45℃ VFB=0.5V Supply Current vs. VIN 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 2 2.5 3 3.5 4 4.5 5 5.5 6 VIN (V) S up pl y C ur re nt (u A ) 85℃ 25℃ -45℃ Shutdown Reference Voltage vs. Temperature 0.595 0.596 0.597 0.598 0.599 0.6 0.601 0.602 -60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 Temperature (℃) R ef er en ce V ol ta ge (V ) VIN=3.6V Frequency vs. Temerature 1.47 1.475 1.48 1.485 1.49 1.495 1.5 1.505 1.51 1.515 1.52 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 Temperature(℃) Fr eq ue nc y (M H z) VIN =3.6V Supply Current vs. VIN 60 62 64 66 68 70 72 74 76 78 80 2 2.5 3 3.5 4 4.5 5 5.5 6 VIN (V) S up pl y C ur re nt (u A) 85℃ 25℃ -45℃ VFB=0.65V Line Regulation 0.585 0.59 0.595 0.6 0.605 0.61 2 2.5 3 3.5 4 4.5 5 5.5 6 VIN (V) R ef er en ce V ol ta ge (V ) TA=25℃ Frequency vs. VIN 1.45 1.46 1.47 1.48 1.49 1.5 1.51 1.52 1.53 1.54 1.55 2 2.5 3 3.5 4 4.5 5 5.5 6 VIN (V) Fr eq ue nc y (M H z) TA=25℃ SWITCH LEAKAGE vs. INPUT VOLTAGE 0 0.2 0.4 0.6 0.8 1 1.2 1 2 3 4 5 6 7 VIN (V) S W IT C H L E A K A G E (n A ) SYNCHRONOU MAIN SWITCH TA=25℃ FP6167 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. 0.67 8/14 Function Description Control Loop The FP6167 is a high efficiency current mode dual synchronous buck regulators. Both the main (P-channel MOSFET) and synchronous (N-channel MOSFET) switches are built internally. With current mode operation, the PWM duty is controlled both by the error amplifier output and the peak inductor current. At the beginning of each cycle, the oscillator turn on the P-MOSFET switch to source current from VIN to SW output. Then, the chip starts to compare the inductor current with the error amplifier output. Once the inductor current is larger than the error amplifier output, the P-MOSFET switch is turned off. When the load current increases, the feedback voltage FB will slightly drop. This causes the error amplifier to output a higher current level until the prior mentioned peak inductor current reach the same level. The output voltage then can be sustained at the same. When the top P-MOSFET switch is off, the bottom synchronous N-MOSFET switch is turned on. Once the inductor current reverses, both top and bottom MOSFET will be turn off to leave the SW pin into high impedance state. The FP6167’s current mode control loop also contains slope compensation to suppress sub-harmonic oscillations at high duty cycles. This slope compensation is achieved by adding a compensation ramp to the inductor current signal. LDO Mode The FP6167’s maximum duty cycle can reach 100%. That means the driver main switch is turn on through out whole clock cycle. Once the duty reaches 100%, the feedback path no longer controls the output voltage. The output voltage will be the input voltage minus the main switch voltage drop. Over Current Protection FP6167 limits the peak main switch current cycle by cycle. When over current happens, chip will turn off the main switch and turn the synchronous switch on until next cycle. Short Circuit Protection When the FB pin drops below 300mV, the chip will tri-state the output pin SW automatically. After 300us rest to avoid over heating, chip will re-initiate PWM operation with soft start. Thermal Protection FP6167 will shutdown automatically when the internal junction temperature reaches 150℃ to protect both the part and the system. FP6167 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. 0.67 9/14 Application Information Input capacitor Selection The input capacitor must be connected to the VIN pin and GND pin of the FP6167 to maintain steady input voltage and filter out the pulsing input current. The voltage rating of input capacitor must be greater than maximum input voltage plus ripple voltage. In switch mode, the input current is discontinuous in a buck converter. The source current of the high-side MOSFET is a square wave. To prevent large voltage transients, a low ESR input capacitor sized for the maximum RMS current must be used. The RMS value of input capacitor current can be calculated by:      IN O IN O MAX_ORMS V V1 V VII It can be seen that when VO is half of VIN, CIN is under the worst current stress. The worst current stress on CIN is IO_MAX/2. Inductor Selection The value of the inductor is selected based on the desired ripple current. Large inductance gives low inductor ripple current and small inductance result in high ripple current. However, the larger value inductor has a larger physical size, higher series resistance, and/or lower saturation current. In experience, the value is to allow the peak-to-peak ripple current in the inductor to be 10%~20% maximum load current. The inductance value can be calculated by:   INOOOININOLOIN V V I%)20~%10(2f )VV( V V If )VV(L    The inductor ripple current can be calculated by:      IN OO L V V 1 Lf V I Choose an inductor that does not saturate under the worst-case load conditions, which is the load current plus half the peak-to-peak inductor ripple current, even at the highest operating temperature. The peak inductor current is: 2 I II LOPEAK_L  FP6167 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. 0.67 10/14 The inductors in different shape and style are available from manufacturers. Shielded inductors are small and radiate less EMI issue. But they cost more than unshielded inductors. The choice depends on EMI requirement, price and size. Output Capacitor Selection The output capacitor is required to maintain the DC output voltage. Low ESR capacitors are preferred to keep the output voltage ripple low. In a buck converter circuit, output ripple voltage is determined by inductor value, switching frequency, output capacitor value and ESR. The output ripple is determined by:      OUTCOUTLO Cf8 1ESRIV Where f = operating frequency, COUT= output capacitance and ΔIL = ripple current in the inductor. For a fixed output voltage, the output ripple is highest at maximum input voltage since ΔIL increases with input voltage. Using Ceramic Input and Output Capacitors Care must be taken when ceramic capacitors are used at the input and the output. When a ceramic capacitor is used at the input and the power is supplied by a wall adapter through long wires, a load step at the output can induce ringing at the input, VIN. At best, this ringing can couple to the output and be mistaken as loop instability. At worst, a sudden inrush of current through the long wires can potentially cause a voltage spike at VIN, large enough to damage the part. When choosing the input and output ceramic capacitors, choose the X5R or X7R dielectric formulations. These dielectrics have the best temperature and voltage characteristics of all the ceramics for a given value and size. Inductor Value (µH) Dimensions (mm) Component Supplier Model 2.2 8.3×8.3×4.5 FENG-JUI TPRH8D43-2R2M 2.2 10.3×10.3×4.0 FENG-JUI TPRH10D40-2R2M 3.3 8.3×8.3×4.5 FENG-JUI TPRH8D43-3R3M 3.3 10.3×10.3×4.0 FENG-JUI TPRH10D40-3R3M 4.7 8.3×8.3×4.5 FENG-JUI TPRH8D43-4R7M 4.7 10.3×10.3×4.0 FENG-JUI TPRH10D40-4R7M Capacitor Value Case Size Component Supplier Model 10μF 0805 Taiyo Yuden JMK212BJ106MG 10μF 0805 TDK C12012X5ROJ106K 22μF 0805 1206 TDK C2012JB0J226M FP6167 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. 0.67 11/14 Output Voltage Programming In the adjustable version, the output voltage is set using a resistive voltage divider from the output voltage to FB. The output voltage is:      2 1 O R R1V6.0V The recommended resistor value is summarized below: VOUT (V) R1 (Ω) R2 (Ω) C3 (F) 0.6 200k Not Used Not Used 1.2 200k 200k 10p 1.5 300k 200k 10p 1.8 200k 100k 10p 2.5 270k 85k 10p 3.3 306k 68k 10p PC Board Layout Checklist 1. The power traces, consisting of the GND trace, the SW trace and the VIN trace should be kept short, direct and wide. 2. Place CIN near VIN Pin as closely as possible. To maintain input voltage steady and filter out the pulsing input current. 3. The resistive divider R1and R2 must be connected to FB pin directly 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 to have a ground plane between the top layer and the layer on which the feedback trace is routed. This reduces EMI radiation on to the DC-DC converter’s own voltage feedback trace. 5. Keep the GND plates of CIN and COUT as close as possible. Then connect this to the ground-plane (if one is used) with several vias. This reduces ground plane noise by preventing the switching currents from circulating through the ground plane. It also reduces ground bounce at the FP6167 by giving it a low impedance ground connection. FP6167 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. 0.67 12/14 9 8 3 5 4 12 11 1 2 6 7 10 VIA TO VOUT1 R11 R12 CC1 COUT1 L1 VOUT2 COUT2 VOUT1 VIA TO VOUT2 CC2 R21 R22 VIN1 VIN2 CIN1 CIN2 FP6167 Suggested Layout Typical Application FP6167 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. 0.67 13/14 ILOAD: 100mA~1A Ch1:VOUT Ch4: ISW EN On waveform (VOUT: 2.5V) Ch1: EN Ch2: SW Ch3: VOUT Ch4: ISW ILOAD: 200mA~1A Ch1: VOUT Ch4: ISW Efficiency (VOUT: 2.5V) 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 100 1000 Vcc=2.7V Vcc=3.6V Vcc=4.2V FP6167 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. 0.67 14/14 Package Outline DFN-12L UNIT: mm Symbols Min. (mm) Max. (mm) A 0.700 0.800 A1 0.000 0.050 b 0.180 0.280 c 0.200 REF. D 2.900 3.100 D2 2.450 2.550 E 2.900 3.100 E2 50 1.650 e 0.450 L 0.350 0.450 y 0.000 0.075