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Technical content
Features
Wide Supply Voltage Operating Range: 1.8 to 12V Precision Feedback Reference Voltage: 0.5V (±2%) High Speed Oscillator Frequency: 600KHz max. Low Current Consumption: Operation Mode 5.5mA Low Current Consumption: Shutdown Mode 1 μA Programmable Soft Start Function (SS) Short Circuit Protection Function (SCP) Totem-pole Output Shutdown Function with Adjustable Driving Current Package: SOP-8L, SOP-8L (EP), TSSOP-8L and MSOP-8L
Applications
Low Input Voltage DC / DC Converter Battery used Equipment Low Output Voltage DC / DC Converter
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 2 4 0.1V 0.5V Error Amp. 500KΩ 36kΩ 0.8V 1.25V DTC 0.6V PWM Comp. 0.1V 0.22V Output Drive Control Circuits Soft Start SCP Circuits Reference Regulator Sawtooth Wave Oscillator FB COMP GND SCP CTL OUT VCC OSC
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. Pin Descriptions SOP-8L FP5108 9Fa-86L SOP-8L (EP) FB SCP VCC CTL COMP OSC GND OUT Top View EP Bottom View Name No. I / O Description FB 1 I Error amplifier Inverting input SCP 2 I Connected a Capacitor Soft Start and SCP Function pin VCC 3 P IC Power Supply CTL 4 I Shutdown or Adjust Driving Current pin OUT 5 O Totem-pole Output GND 6 P IC Ground OSC 7 I Capacitor and Resistor Connected for Adjusting the Oscillation Frequency COMP 8 O Error Amplifier Compensation Output Name No. I / O Description FB 1 I Error amplifier Inverting input SCP 2 I Connected a Capacitor Soft Start and SCP Function pin VCC 3 P IC Power Supply CTL 4 I Shutdown or Adjust Driving Current pin OUT 5 O Totem-pole Output GND 6 P IC Ground OSC 7 I Capacitor and Resistor Connected for adjusting the Oscillation Frequency COMP 8 O Error Amplifier Compensation Output EP 9 P Exposed PAD. Must connect to GND
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. TSSOP-8L MSOP-8L FP5108 9Fa86L Name No. I / O Description FB 1 I Error amplifier Inverting input SCP 2 I Connected a Capacitor Soft Start and SCP Function pin VCC 3 P IC Power Supply CTL 4 I Shutdown or Adjust Driving Current pin OUT 5 O Totem-pole Output GND 6 P IC Ground OSC 7 I Capacitor and Resistor Connected for adjusting the Oscillation Frequency COMP 8 O Error Amplifier Compensation Output Name No. I / O Description FB 1 I Error amplifier Inverting input SCP 2 I Connected a Capacitor Soft Start and SCP Function pin VCC 3 P IC Power Supply CTL 4 I Shutdown or Adjust Driving Current pin OUT 5 O Totem-pole Output GND 6 P IC Ground OSC 7 I Capacitor and Resistor Connected for adjusting the Oscillation Frequency COMP 8 O Error Amplifier Compensation Output
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. Marking Information SOP-8L & SOP-8L (EP) TSSOP-8L 9Fa86L Halogen Free Lot Number Internal ID Per-Half Month Year FP5108 MSOP-8L Halogen Free Lot Number Internal ID Per-Half Month Year FP5108 9Fa86L 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 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 FP5108DR-LF -10°C ~ +85°C SOP-8L 2500EA Tape & Reel FP5108XR-LF -10°C ~ +85°C SOP-8L (EP) 2500EA Tape & Reel FP5108WR-LF -10°C ~ +85°C TSSOP-8L 2500EA Tape & Reel FP5108TR-LF -10°C ~ +85°C MSOP-8L 2500EA Tape & Reel Absolute Maximum Ratings Parameter Symbol Conditions Min. Typ. Max. Unit Power Supply Voltage V IN 12 V Output Source Current -50 mA Output Sink Current 50 mA SOP-8L, TA +25≦ ℃ 570 mW SOP-8L (EP), TA +25≦ ℃ 400 mW TSSOP-8L (EP), TA +25≦ ℃ 400 mW Allowable Power Dissipation MSOP-8L (EP), TA +25≦ ℃ 600 mW Thermal Resistance Junction to Ambient (SOP package) +175 ℃ / W Storage Temperature -55 +125 ℃ Lead Temperature (soldering, 10 sec) +260 ℃ 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 1.8 12 V Operating Temperature -10 +85 ℃ Parameter Symbol Test Conditions Min. Typ. Max. Unit Under Voltage Lock-Out Section (UVLO) Low Threshold Voltage V LOW 0.9 V Upper Threshold Voltage V UPPER 1.1 1.3 1.5 V Soft Start Section (SS) Input Source Current I SS V SS=0V -1.5 -1.0 -0.7 µA Soft Start Threshold Voltage VSST 0.8 0.9 1.0 V Short Circuit Protection Section (S.C.P .) Input Source Current ISCP VSCP= 0V -1.5 -1.0 -0.7 μA Oscillator Section Oscillation Frequency f RT=3.0KΩ, CT=270pF 400 500 600 KHz Frequency Change with Voltage Δf / ΔV V CC=2V to 15V 2 10 % Frequency Change with Temperature Δf / ΔT TA = 0℃ to 85℃ 5 % Idle Period Adjustment Section Maximum Duty Cycle T DUTY RT=3.0kΩ, CT=270pF, VFB=0.8V 75 85 % Total Device Section Stand-by Current I STANDBY Pin4 is Open or V CC 1 μA Average Supply Current I AVE RB=390Ω, VCC=0~20V 5.0 10 mA Error Amplifier Section Input Threshold Voltage V FB V COMP=450mV 480 500 520 mV VT Change with Voltage ΔVFB / ΔV VCC=2V to 15V 5 20 mV VT Change with Temperature ΔVFB / ΔT TA = -10℃ to 85℃ 1 % Input Bias Current I B -1.0 -0.2 1.0 μA Voltage Gain Av 100 V / V Frequency Bandwidth BW Av=0 dB 6 MHz Output Voltage Swing Positive V POS 0.78 0.87 V Output Voltage Swing Negative V NEG 0.05 0.2 V Output Source Current I SOURCE V COMP=450mV -40 -24 μA Output Sink Current I SINK V COMP=450mV 24 40 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. Parameter Symbol Test Conditions Min. Typ. Max. Unit Output Section Output High Voltage V OH1 RB=390Ω, IO=-15mA 1.0 1.2 V Output High Voltage V OH2 RB=750Ω, IO=-10mA, VCC= 1.8V 0.8 1.0 V Output Saturation Voltage V OL1 RB=390Ω, IO=15mA 0.1 0.2 V Output Saturation Voltage V OL2 RB=750Ω, IO=10mA, VCC= 1.8V 0.1 0.2 V Output Source Current I OSOURCE RB=390Ω, Vo=0.9V -40 -20 mA Output Sink Current I OSINK RB=390Ω, Vo=0.3V 30 40 mA Output Current Setting / Control Section Pin Voltage V BR RB=390Ω 0.15 0.22 0.3 V Input off Condition I OFF -20 0 μA Input on Condition I ON -45 μA Pin Current Range I BR -1.8 -0.1 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. Timing Waveform Short Circuit Protection tpe Output Short Circuit Output Short CircuitPower On Soft-start ts CTL# ON OFF Soft-start & SCP pin OUTPUT pin Soft-start setting voltage Idle Period Voltage COMP pin Short Circuit Comparator Voltage Figure12. FP5108 Timing Diagram
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 1.25V regulator operating from V CC is used to power the internal circuitry of the FP5108. An internal resistive divider provides 0.5V reference for the error amplifier, Soft-start (typ. 0.9V) and SCP (typ. 0.8V) circuits. Error Amplifier The error amplifier compares a sample of t he DC-DC converter output voltage to the 0.5V reference and generates an error signal for the PWM comparator. Output voltage of DC-DC converter is setting with the resistor divider using the following expression (see figure 13) 5.02R 1R1VOUT FB COMP 0.5V 36K 500 VOUT FP5108 Error Amplifier Figure13. Error Amplifier with Feedback Resistance Divider Oscillator The oscillator frequency can be set from 20KHz to 500KHz by connecting a resistor and a capacitor at OSC pin of FP5108 to ground. The oscillator frequency can be determined by using the graph shown in figure 9. The oscillator output is a sawtooth wave with a minimum value of approximately 0.1V and a maximum value of approximately 0.6V. The PWM com parator compares the oscillator voltage with error amplifier output voltage; internal DTC voltage (typ. 0.6V) and soft start setting voltage. When the sawtooth wave voltage is lower than above three-out put voltage, the output of FP5108 is low (Driving for PNP transistor or PMOS).
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. Under Voltage Lockout (UVLO) The under voltage lockout circuits turn the output off and whenever the supply voltage drops too low (approximately 0.9V at 25℃) for proper operation. A hysteresis voltage of 200mV eliminates false triggering on noise and chattering. The soft start is functional after power on, and the interval of soft start time is determined by a capacitor connected to SCP pin (pin 2). When soft start function finished, the internal soft start voltage is setting high, but external SCP pin is setting lo w in order to change to short circuit detection / protection function. The time of soft start is following expression: The short circuit protection is functional due to a heavy loading drop and output of error amplifier (COMP pin) is maintain a V POS (typ. 0.87V), the capacitor is char ged to SCP threshold voltage (typ. 0.8V), then FP5108 output is turn-off (internal pull-high) and the capacitor is discharged to low state. Output Transistor FP5108 will be shutdown immediately whenever COMP voltage is lower than 0.4V. The mean is hard to maintain the output voltage during maxi mum duty cycle under short-circuit, and the PWM output are off until power restart. FP5108 CTL R CTL# Figure14. Output Transistor Driving Control 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. CTL pin can also use to control the output of FP5108 for shutdown or re-start function of system.
Application Information
VIN +3.3V VOUT +1.8V VIN SCD34 R30 10k 10k R8 4.7k SW1 ON / OFF Socket IC1 FP5108 4 5 8FB SCP VCC BR / CTL OUT GND OSC COMP 330µF AP9620M 20K 0.1µF 0.1µF R4 220K NPN3904 270pF 0.1µF 330µF L1 50µH 330µF 3.9K 0.1µF Figure15. FP5108 Basic Buck Converter Circuits For example: The Vin is 3.3VDC, and Vout is 1.8V with 2.5A load. The output voltage equation is: V78.1V5.0K9.3 K101V5R 2R1V FBOUT The Soft-start time: The SCP time: ms801.80.05C8.0Tscp CTL# Control Pin Q1 CTL Pin Output Transistor Function Mode Low Off High Disable Shutdown High On Bias Current Enable Operation
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 U N I T : m m Note: 1. Package dimensions are in compliance with JEDEC outline: MS-012 AC. 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 1.244 1.651 D 9.804 10.007 E 3.810 3.987 H 5.791 6.197 L 0.406 1.270 θ° 0° 8°
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. SOP-8L (EP) U N I T : m m Exposed PAD Dimensions: Note: 1. Package dimensions are in compliance with JEDEC outline: MO-178 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
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. TSSOP-8L UNIT: mm Note: 1. Package dimensions are in compliance with JEDEC outline: MO-153 AA. 2. Dimension “D” does not include molding flash, protrusions or gate burrs. 3. Dimension “E1” does not include inter-lead flash or protrusions. Symbols Min. (mm) Max. (mm) A 1.200 A1 0.050 0.150 A2 0.960 1.060 D 2.900 3.100 E 6.400 BSC E1 4.300 4.500 L 0.450 0.750 θ° 0° 8°
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. MSOP-8L UNIT: mm 10. 11. 12. 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. 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 0.800 L1 0.950 REF θ° 0° 8°