DATASHEET SEARCH SITE | WWW.ALLDATASHEET.COM
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 15
Technical content
Features
Precision Feedback Reference Voltage: 0.8V (2%) Wide Supply Voltage Operating Range: 3.6 to 20V Low Current Consumption: 3mA Internal Fixed Oscillator Frequency: 320KHz (Typ.) Internal Soft-Sta rt Function (SS) Built-In P-MOSFET for 3A Output Loading Over Current Protection Package: SOP-8L Typical Application Circuit
This datasheet contains new product information. Feeling Technology reserves the ri ghts 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 Oscillator Internal Soft-Start EN Thermal Protection GND GND Reference Regulator Over Current Protection Output Driver Control Enable Control 0.8V FB LX LX 2.5V Error Amplifier COMP Pin Descriptions SOP-8L FP6112 9Fa-86L Name No. I / O Description FB 1 I Error Amplifier Inverting Input COMP 2 O Error Amplifier Output for Compensation EN 3 I Enable Control VCC 4 P IC Power Supply (PMOS Source) LX 5 O PMOS High Current Output LX 6 O PMOS High Current Output GND 7 P IC Ground GND 8 P IC Ground
This datasheet contains new product information. Feeling Technology reserves the ri ghts 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. IC Date Code Identification Halogen Free Lot Number Mass Production Version Per-Half Month Year FP6112 Halogen Free: Halogen free product indicator Lot Number: Wafer lot number’s last two digits For Example: 132386TB 86 Mass Production Version: Mass production mask version 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 ri ghts 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 Operating Temperature Package MOQ Description FP6112D-G1 -25°C ~ +85°C SOP-8L 100 EA Tube FP6112DR-G1 -25°C ~ +85°C SOP-8L 2500 EA Tape & Reel Absolute Maximum Ratings Parameter Symbol Conditions Min. Typ. Max. Unit Power Supply Voltage V CC 25 V Output Source Current 3.3 A Error Amplifier Inverting Input -0.3 1.2 V Allowable Power Dissipation P D SOP-8L TA +25≦ °C 650 mW Junction to Ambient Thermal Resistance θJA +175 °C / W Junction to Case Thermal Resistance θJC +45 °C / W Operating Temperature -25 +85 °C HBM (Human Body Mode) 2 KV ESD Susceptibility MM (Machine Mode) 200 V Storage Temperature T S SOP-8L -55 +125 °C SOP-8L Lead Temperature (soldering, 10 sec) +260 °C Suggested IR Re-flow Soldering Curve
This datasheet contains new product information. Feeling Technology reserves the ri ghts 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 V CC 3.6 20 V Operating Temperature -25 85 °C Parameter Symbol Conditions Min. Typ. Max. Unit Reference Feedback Voltage V REF 0.784 0.8 0.816 V Input Regulation V△ REF / VREF VCC=3.6V to 20 V 2 12.5 mV TA=-25°C to +25°C 1 2 % Feedback Voltage Change with Temperature V△ REF / VREF TA=-25°C to +85°C 1 2 % Oscillator Section Oscillation Frequency f 0.4V < V COMP < 0.7V 320 KHz Short Circuit or Over Current Oscillation Frequency fSC V COMP<0.4V 30 KHz Frequency Change with Voltage Δf / ΔV V CC=3.6V to 25V 5 % Frequency Change with Temperature Δf / ΔT TA = -25V to +85°C 5 % Idle Period Adjustment Section Maximum Duty Cycle TDUTY V FB =0.2V 80 % Output Section PMOS Switch Current I D -3 A PMOS D-S Voltage V DSS V COMP=0.1V -30 V Output Leakage Current I L 5 µA VCC=5.0V,VFB=0V 70 150 mΩ PMOS On Resistance R DS (ON) VCC=10V,VFB=0V 42 90 mΩ Thermal Shutdown Section Thermal Shutdown Temperature +150 °C Over Current Protection Section PMOS OCP Current I OCP VCC=12V 4 A Total Device Section EN Pin Input Current I EN V EN =GND 20 µA EN Pin On Threshold V UPPER EN pin upper 1.12 V EN Pin Off Threshold V LOW EN pin low 0.87 V EN Pin Hysteresis V HYS 210 250 mV Supply Shutdown Current I SD V EN=0V 2 10 µA Supply Average current I AVE 4 6 mA
This datasheet contains new product information. Feeling Technology reserves the ri ghts 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. Parameter Symbol Conditions Min. Typ. Max. Unit Error Amplifier Section Input Bias Current l B -1.0 µA Voltage Gain Av 100 V / V Frequency Bandwidth BW Av=0 dB 6 MH Z Output Voltage Swing Positive V POS 1.7 2 V Output Voltage Swing Negative V NEG 0.1 0.2 V Output Source Current I SOURCE V COMP=800mV -15 -30 µA Output Sink Current I SINK V COMP=800mV 15 30 µA
This datasheet contains new product information. Feeling Technology reserves the ri ghts 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. Typical Operating Characteristics (VIN=12V, VOUT=3.3V, IOUT=2A, TA= 25°C, unless otherwise noted) Load Regulation VIN=12V 3.35 3.37 3.39 3.41 3.43 3.45 3.47 3.49 3.51 3.53 3.55 00 . 511 . 522 . 53 IOUT (A) VOUT (V) Line Regulation IOUT=200mA 3.418 3.42 3.422 3.424 3.426 3.428 3.43 3.432 3.434 3.436 3.438 0 5 10 15 20 VIN (V) VOUT (V) Supply Current vs. VIN 3.2 3.25 3.3 3.35 3.4 3.45 3.5 0 5 10 15 20 VIN (V) Supply Current (mA) Current Limit vs. Temperature 2.5 3.5 4.5 5.5 -40 -20 0 20 40 60 80 100 Temperature (℃) Current Limit (A) Oscillator Frequency vs. VIN VOUT=3.3V IOUT=200mA 340 342 344 346 348 350 352 354 356 358 360 0 5 10 15 20 VIN(V) Oscillator Frequency(kHz) Current Limit vs. VIN 3.2 3.4 3.6 3.8 4.2 4.4 4.6 4.8 0 5 10 15 20 VIN (V) Current Limit (A) Supply Current vs. Temperature 3.2 3.22 3.24 3.26 3.28 3.3 3.32 3.34 3.36 3.38 3.4 - 4 0 - 2 00 2 04 06 08 0 1 0 0 Temperature (℃) Supply Current (mA) Efficiecncy (VIN=12V,L=22uH) 00 . 5 11 . 522 . 53 I OUT (A) Efficiency (%) VOUT=3.3V VOUT=5V
This datasheet contains new product information. Feeling Technology reserves the ri ghts 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. Output Ripple Ch1: LX, Ch2: V OUT EN on Test Ch1: EN, Ch2: LX, Ch3: V OUT, Ch4: ILX Transient Response (I OUT=0.1A to 3A) Ch3: V OUT, Ch4: ILX Power on Test Ch1: V IN, Ch2: LX, Ch3: VOUT, Ch4: ILX
This datasheet contains new product information. Feeling Technology reserves the ri ghts 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 Voltage Reference A 2.5V reference regulator suppl ies FP6112 internal circuits and uses a resistive divider to provide 0.8V precision reference voltage on the non-inverting terminal of error amplifier. Error Amplifier The error amplifier compares a sample of t he DC-DC converter output voltage to the 0.8V (V REF) reference and generates an error signal for the PWM comparator. Output voltage of the DC-DC converter is setting by the resistor divider with following expression (see Figure 1) REF OUT VR R1V 0.8V 36K 500 VOUT T FP6112 Error Amplifier Figure 1 Error Amplifier with Feedback resistance divider The recommended resistor value is summarized below: VOUT (V) R1 (kΩ) R2 (kΩ) 1.8 2.4k 3k 2.5 3.2k 6.8k 3.3 1.5k 4.7k 5 2k 10.5k
This datasheet contains new product information. Feeling Technology reserves the ri ghts 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. Oscillator The fixed frequency is generated by an internal RC oscillator. Its typical value is 320KHz in normal operation and 30KHz in short circuit condition. Thermal Protection When a heavy loading draws current from the regulat or, the chip temperature will rise. Once the junction temperature exceeds 150℃, FP6112 thermal protection function will be triggered and the LX output will be turned off. When junction temperature is lower, FP6112 starts again and enable LX pin output. Over Current Protection The FP6112 uses cycle-by-cycle current limit to pr otect the internal power switch. During each switching cycle, a current limit comparator detects if the power switch current exceeds the internal setting current, and begins over current protection de crease the oscillator fr equency to prevent the driver from burning out.
This datasheet contains new product information. Feeling Technology reserves the ri ghts 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
The input capacitor must be connected between the VCC and GND pin of the FP6112 to maintain steady input voltage and filter out the pulsing input cu rrent. 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 transient s, 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 ORMS V V1V VII MAX 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 maximum tolerant ripple current. Large inductance gives low inductor ripple current and small inductance result in high ripple current. However, the larger value inductor usually has a larger physical size, higher series resistance, and lower saturation current. On the 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: IN O O OIN IN O L OIN V V I%)20~%10(2f )VV( V V If )VV(L The inductor ripple current can be calculated by: IN OO L V V1Lf VI Choose an inductor that does not saturate u nder the worst-case load conditions, which is the load current plus half the peak-to-peak induct or ripple current, even at the highest operating temperature. The peak inductor current is: III L OPEAK_L
This datasheet contains new product information. Feeling Technology reserves the ri ghts 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. The inductors in different shape and style are av ailable 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: OUT CLO Cf8 1ESRIV OUT Where f = operating frequency, COUT= output capacitance and ΔIL = ripple current in the inductor. For a fixed output voltage, t he 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. In best condition, this ringing can couple to the output and be mistaken as loop instability. In wo rst condition, a sudden inrush of current through the long wires can potentially generate a voltage spike at VIN, which may large enough to damage the part. When choosing the input and output ceramic ca pacitors, choose the one with X5R or X7R dielectric formulations. These dielectrics have the best temperature and voltage characteristics of all the ceramics for a given value and size. PC Board Layout Checklist 1. The power traces, consisting of the GND, SW and V IN traces, should be kept short, direct and wide. 2. Place CIN near VCC pin as closely as possible to maintain input voltage steady and filter out the pulsing input current. Inductor Value (µH) Dimensions(mm) Component Supplier Model 10 10.3×10.3×4.0 FENG-JUI TPRH10D40-10R 10 10.1×10.1×3.0 Sumida CDRH104R 15 10.3×10.3×4.0 FENG-JUI TPRH10D40-15R
This datasheet contains new product information. Feeling Technology reserves the ri ghts 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. 3. The resistive divider R1and R2 must be connected to FB pin directly and 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 pla ne between the top and feedback trace routing layer. This reduces EMI radiation on to the DC-DC converter’s own voltage feedback trace. 5. Keep the GND plates of C IN and C OUT 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 FP6112 GND pin by giving it a low impedance ground connection. Suggested Layout
This datasheet contains new product information. Feeling Technology reserves the ri ghts 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. Typical Application FP6112 Basic DC-DC Regulator Circuit For example: The VIN power supply is 12V and the VOUT is designed for 5.0V / 3A solution. The output voltage formula is: V0.5V8.0K2 0.5K11VR R1V REF 2OUT
This datasheet contains new product information. Feeling Technology reserves the ri ghts 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 SOP-8L Note: 1. Package dimensions are in complian ce 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 0.101 0.254 A2 1.092 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°