FP6145BSPCTR

FP6145B fitipower integrated technology lnc. 2A Ultra Low Dropout Linear Regulator Description Features The FP6145B is a 2A ultra low dropout linear regulator. This product is specifically designed to provide well supply voltage for front-side-bus termination on motherboards and NB applications. The IC needs two supply voltages, control voltage for the circuitry and main supply voltage for power conversion, to reduce power dissipation and provide extremely low dropout. The FP6145B integrates many functions. Power-On-Reset (POR) circuit monitors both supply voltages to prevent wrong operations. Thermal shutdown and current limit functions protect the device against thermal and current over-loads. POK indicates the output status with time delay which is set internally. It can control other converter for power sequence. The FP6145B can be enabled by other power system. Pulling and holding the EN pin below 0.4V shuts off the output.  The FP6145B is available in SOP-8 (EP) package which features small size as an exposed pad to reduce the junction-to-case resistance.           Ultra Low Dropout - 0.24V(typ.) at 2A Output Current Low ESR Output Capacitor (Multi-layer Chip Capacitors (MLCC)) Applicable 0.8V Reference Voltage Fast Transient Response Adjustable Output Voltage by External Resistors Power-On-Reset Monitoring on Both VCNTL and VIN Pins Internal Soft-Start Under-Voltage Protection Current-Limit and Thermal Shutdown Protection Power-OK Output with a Delay Time SOP-8 Exposed Pad Green Package Applications       LCD Monitor/TV PC Motherboard/NB Graphic Card DVD-Video Player ADSL Modem Printer and other Peripheral Equipment Pin Assignment Ordering Information SP Package (SOP-8 Exposed Pad) FP6145B□□□ FP6368□□□ Top View POK 1 8 GND EN VIN 2 9 3 GND 7 FB 6 VOUT VCNTL 4 5 NC TR: Tape/Reel C: Green Package Type SP: SOP-8 (Exposed Pad) Figure1. Pin Assignment of FP6145B FP6145B-1.0-MAR-2014 1 FP6145B fitipower integrated technology lnc. Typical Application Circuit R3 10K U1 VCNTL=5V 4 VCNTL C1 1μF 1 ON OFF 2 POK VIN 3 FP6145B EN NC VOUT 8 GND FB VIN=1.5V 5 C2 100μF 6 C3 0.1μF 7 VOUT=1.2V/2A R1 1K C6 12~48nF C4 220μF C5 0.1μF R2 2K Figure 2. an EC as a Main Output Capacitor R3 10K U2 VCNTL=5V C1 1μF ON OFF 4 VCNTL VIN 3 1 NC 2 POK EN FP6145B VOUT 8 GND VOUT=VFB*(1+R1/R2) VFB=0.8V FB VIN=1.5V 5 C2 10μF 6 7 VOUT=1.2V/2A R1 39K C4 56pF C3 10μF R2 78K Figure 3. Using a MLCC as the Output Capacitor FP6145B-1.0-MAR-2014 2 FP6145B fitipower integrated technology lnc. Functional Pin Description Pin Name Pin No. Pin Function POK 1 Power OK output pin. EN 2 Internal pull high. EN=High or Floating  Enable. EN=Low  Shutdown mode. VIN 3 MOSFET power supply input pin. VCNTL 4 Input pin for internal control circuitry. NC 5 No connection. VOUT 6 Output pin of the regulator. FB 7 Output voltage feedback pin. GND 8 GND pin. Exposed Pad 9 Thermal dissipation pad. Connect exposed pad to GND. Block Diagram N-MOSFET VIN Power-ON Reset VCNTL 1MΩ EN Current Limit and Foldback Enable Soft-Start And Control Logic VOUT Error Amp - + Vref = 0.8V UVP GND + FB Delay + 0.35V POK - Thermal Shutdown 92% Vref POK Figure 4. Block Diagram of FP6145B FP6145B-1.0-MAR-2014 3 fitipower integrated technology lnc. FP6145B Absolute Maximum Ratings ● VCNTL Supply Voltage ---------------------------------------------------------------------------------- -0.3V to +6V ● VIN Supply Voltage --------------------------------------------------------------------------------------- -0.3V to +6V ● VCNTL and VIN Pulse Voltage (15ns) ---------------------------------------------------------------- -0.3V to +10V ● EN and FB Pin Voltage ----------------------------------------------------------------------------------- -0.3V to VCNTL+0.3V ● Power OK Voltage ----------------------------------------------------------------------------------------- -0.3V to +6V ● Power Dissipation @TA=25°C, (PD) (Note 1) SOP-8 (Exposed Pad) ------------------------------------------------------------------------ 2.08W ● Package Thermal Resistance, (θJA) SOP-8 (Exposed Pad) ------------------------------------------------------------------------ 60°C/W ● Package Thermal Resistance, (θJC) SOP-8 (Exposed Pad) ------------------------------------------------------------------------ 15°C/W ● Lead Temperature (Soldering, 10sec.) --------------------------------------------------------------- 260°C ●Junction Temperature (TJ) ------------------------------------------------------------------------------- -40°C to 150°C ● Storage Temperature (TSTG) ---------------------------------------------------------------------------- -65°C to 150°C Note 1：θJA is measured with the PCB copper area (need connecting to Expose-Pad) of approximately 1.5 in2 (Multi-layer) Recommended Operating Conditions ● VCNTL Supply Voltage ----------------------------------------------------------------------------------- +3V to +5.5V ● VIN Supply Voltage ---------------------------------------------------------------------------------------- +1.2V to +5.5V ● Output Voltage (Conditions: VCNTL-VOUT>1.9V) ----------------------------------------------------- 0.8V to VIN-VDROP ● Output Current ---------------------------------------------------------------------------------------------- 0A to 2A ● Operating Temperature Range ------------------------------------------------------------------------- -40°C to +85°C FP6145B-1.0-MAR-2014 4 FP6145B fitipower integrated technology lnc. Electrical Characteristics (VCNTL=5V, VIN=1.5V, VOUT=1.2V, TA=25°C unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Units VCNTL POR Threshold VCNTL 2.5 2.7 2.9 V VCNTL POR Hysteresis VCNTL(hys) - 0.4 - V VIN POR Threshold VIN 0.95 1.05 1.15 V VIN POR Hysteresis VIN(hys) VCNTL Nominal Supply Current ICNTL 0.3 V EN=VCNTL - 1 1.8 mA - 10 15 μA VCNTL Shutdown Current ISD EN=0V Feedback Voltage Regulation VFB VCNTL3.0~5.5V IOUT=10mA 0.79 0.8 0.81 V IOUT=10mA~2A - 0.06 0.25 % 1.2V＜VOUT＜1.8V - 0.23 0.28 1.8V≦VOUT＜2.5V - 0.24 0.29 2.5V≦VOUT＜2.8V - 0.28 0.38 2.8V≦VOUT＜3.1V - 0.3 0.4 - 85 - Ω - 0.7 - mS Load Regulation Dropout Voltage VDROP VOUT Pull Low Resistance Soft Start Time IOUT=2A VCNTL=5V V EN=0V TSS VENH Enable 1.2 - - VENL Disable - - 0.4 EN Pin Logic High threshold voltage V EN Pin Pull High Resistor IEN EN=VCNTL - 1 - MΩ Current Limit ILIM VCNTL=3~5.5V TJ= -40~125°C 3 4 - A - 65 - - 65 - - 0.35 - V - 120 - mA VIN Ripple Rejection PSRR F=120Hz, IOUT=100mA VCNTL Under-Voltage Protect Threshold VFB Falling Under-Voltage Protect Current Foldback dB POK Threshold Voltage for Power OK VPOK VFB Rising 89% 92% 95% VFB POK Threshold Voltage for Power Not OK VPNOK VFB Falling - 89% - VFB POK sinks 1mA - 0.25 0.4 V TDELAY 1 2 3 mS TSD - 170 - °C TSD(HYS) - 50 - °C POK Low Voltage POK Delay Time Thermal shutdown Temp Thermal Shutdown Hysteresis FP6145B-1.0-MAR-2014 5 FP6145B fitipower integrated technology lnc. Typical Performance Curves VCNTL=5V, VIN=1.5V, VOUT=1.2, IOUT=2A VEN VCNTL= VEN=5V, VOUT=1.2, IOUT=2A 5V/div. VIN 500mV/div. VOUT 500mV/div. VOUT 500mV/div. VPOK 500mV/div. VPOK 500mV/div. IOUT IOUT 1A/div. 2ms/div. 1A/div. 2ms/div. Figure 5. Start-up Response Figure 6. Power On Response 60 VCNTL= VEN=5V VIN=1.5V VOUT =1.2V 50 IOUT Dropout Voltage (mV) VOUT 50mV/div. 1A/div. 40 30 20 10 0 0 200μs/div. 0.5 1 1.5 2 Load Current (A) Figure 7. Load Transient Response Figure 8. Dropout Voltage vs. Load Current 0.81 VCNTL= VEN=VIN VOUT =1.2V No Load Feedback Voltage (V) Feedback Voltage (V) 0.81 0.805 0.8 0.795 VCNTL= VEN=5V VIN=1.5V VOUT =1.2V 0.805 0.8 0.795 0.79 0.79 2.7 3.1 3.5 3.9 4.3 Input Voltage (V) Figure 9. Line Regulation FP6145B-1.0-MAR-2014 4.7 5.1 5.5 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 Load Current (A) Figure 10. Load Regulation 6 FP6145B fitipower integrated technology lnc. Typical Performance Curves (Continued) 1.4 15 VCNTL =VIN VEN=0V VCNTL= VEN=VIN VOUT =1.2V Shutdown Current (µA) Quiescent Current (mA) 1.6 1.2 1 0.8 0.6 0.4 13 11 9 7 5 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 2.7 3.1 3.5 Input Voltage (V) Figure 11. Quiescent Current vs. Input Voltage 1.2 1 0.8 0.6 0.4 0 10 20 30 40 50 60 70 80 90 Temperature (°C) Figure 13. Quiescent Current vs. Temperature FP6145B-1.0-MAR-2014 4.7 5.1 5.5 0.81 VIN=VCNTL= VEN=5V VOUT =1.2V -40 -30 -20 -10 4.3 Figure 12. Shutdown Current vs. Input Voltage Feedback Voltage (V) Quiescent Current (mA) 1.4 3.9 Input Voltage (A) VCNTL= VEN=5V VIN=1.5V VOUT =1.2V 0.805 0.8 0.795 0.79 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 Temperature (°C) Figure 14. Feedback Voltage vs. Temperature 7 fitipower integrated technology lnc. FP6145B Function Description FB Internal Soft-Start Connecting this pin to an external resistor divider receives the feedback voltage of the regulator. The output voltage set by the resistor divider is determined by: An internal soft-start function controls rise rate of the output voltage to limit the current surge at start-up. The typical soft-start interval is about 0.7ms. T R R Where R1 is connected from VOUT to FB with Kelvin sensing, and R2 is connected from FB to GND. A bypass capacitor may be connected with R1 in parallel to improve load transient response. The recommended R1 and R2 are in the range of K~ KΩ VIN MOSFET power supply input pin for power conversions. The voltage at this pin is monitored for Power-On Reset purpose. VCNTL Power input pin of the control circuitry. Connecting this pin to a +5V supply voltage provides the bias for the control circuitry. The voltage at this pin is monitored for Power-On Reset purpose. EN Enable control pin. Pulling and holding this pin below 0.4V shuts down the output. When the IC is re-enabled, it will undergo a new soft-start cycle. When this internal pulled high to VCNTL pin is floating, it’ll enable the regulator. VOUT Output pin of the regulator. It is necessary to connect an output capacitor with this pin for closed-loop compensation and improving transient responses. Power-On-Reset A Power-On-Reset (POR) circuit monitors both voltages at VCNTL and VIN pins to prevent wrong logic controls. The POR function initiates a soft-start process after both supply voltages exceed their rising POR threshold voltages during powering on. The POR function will also pull low the POK pin regardless the output voltage when the VCNTL voltage falls below its falling POR threshold. FP6145B-1.0-MAR-2014 POK Power-OK signal output pin. This pin is an open-drain output used to indicate status of output voltage by sensing FB voltage. This pin will stop sinking current to GND when the rising FB voltage is above the VPOK over 2ms, and sink current again when the falling FB voltage is below the VPNOK, which indicates the output is OK or not. Output Voltage Regulation A temperature compensated 0.8V reference error amplifier and an output NMOS regulates output to the preset voltage. The error amplifier designed with high bandwidth and DC gain provides very fast transient response and less load regulation. It compares Vref with the feedback voltage and amplifies the difference to drive the output NMOS which provides load current from VIN to VOUT. Current-Limit The FP6145B monitors the current via the output NMOS and limits the maximum current to prevent FP6145B from damages during overload or short circuit conditions. Under-Voltage Protection (UVP) UVP prevents itself and load from short circuit damages by monitoring the voltage on FB pin after soft-start process finished. When the voltage on FB pin falls below 0.35V threshold, the circuit will initiate current foldback to reduce current limit to 120mA. When the FB voltage rises over 0.35V again, the current foldback will dismiss. Thermal Shutdown A thermal shutdown circuit limits the junction temperature of FP6145B. When the junction temperature exceeds +170°C, a thermal sensor will turn off the output NMOS for cooling down the device. The regulator will regulate the output again through initiation of a new soft-start cycle after the junction temperature decreases 50°C and this will result in a pulsed output during continuous thermal overload conditions to prevent the system from damages. 8 fitipower integrated technology lnc. FP6145B Application Information Input Capacitor PCB Layout Consideration A minimum 1μF input ceramic capacitor is required. X5R or X7R is recommended. The capacitor should be placed as close to the device as possible for optimal performance. 1. Place the input capacitors of VIN and VCNTL as close to the device as possible. Output Capacitor 3. The exposed pad of the package should be soldered to an equivalent area of metal on the PCB. The area should be maximized to improve thermal performance. 4. Place R1, R2 and C4 close to the device to avoid noise coupling. 5. Use wide tracks for large current paths. The FP6145B requires a minimum of output capacitor to maintain stability. The FP6145B is designed to be stable with low ESR ceramic capacitor. A 10μF ceramic capacitor is sufficient for most applications. X5R or X7R is recommended. The output capacitor must be placed within 1cm from the output pin of the device. 2. Place output capacitor as close to the device as possible. Thermal Considerations The power dissipation of the device can be determined with the formula: P T T Additional copper area for heat sink is required in applications where the minimum input voltage is known and is large compared with the dropout voltage. The below figure shows the maximum allowable power dissipation of SOP-8 exposed pad package for different ambient temperatures, assuming θJA is 60°C/W and the maximum junction temperature is 125°C. 3.5 MAX PD (W) 3 2.5 2 1.5 1 -40 -20 0 20 40 60 80 100 TA (°C) FP6145B-1.0-MAR-2014 9 FP6145B fitipower integrated technology lnc. Outline Information SOP-8 (Exposed Pad) Package (Unit: mm) SYMBOLS UNIT DIMENSION IN MILLIMETER MIN MAX A 1.25 1.70 A1 0.00 0.15 A2 1.25 1.55 B 0.31 0.51 D 4.80 5.00 D1 3.04 3.50 E 3.80 4.00 E1 2.15 2.41 e 1.20 1.34 H 5.80 6.20 L 0.40 1.27 Note：Followed From JEDEC MO-012-E. Carrier Dimensions Life Support Policy Fitipower’s products are not authorized for use as critical components in life support devices or other medical systems FP6145B-1.0-MAR-2014 10