FAN53611AUC205X

DATA SHEET www.onsemi.com Synchronous Buck Regulator, 1 A 6 MHz, 600 mA WLCSP6 1.16 y 0.86 y 0.586 CASE 567QE FAN53601, FAN53611 Description The FAN53601/11 is a 6 MHz, step−down switching voltage regulator, available in 600 mA or 1 A options, that delivers a fixed output from an input voltage supply of 2.3 V to 5.5 V. Using a proprietary architecture with synchronous rectification, the FAN53601/11 is capable of delivering a peak efficiency of 92%, while maintaining efficiency over 80% at load currents as low as 1 mA. The regulator operates at a nominal fixed frequency of 6 MHz, which reduces the value of the external components to as low as 470 nH for the output inductor and 4.7 mF for the output capacitor. In addition, the Pulse Width Modulation (PWM) modulator can be synchronized to an external frequency source. At moderate and light loads, Pulse Frequency Modulation (PFM) is used to operate the device in Power−Save Mode with a typical quiescent current of 24 mA. Even with such a low quiescent current, the part exhibits excellent transient response during large load swings. At higher loads, the system automatically switches to fixed−frequency control, operating at 6 MHz. In Shutdown Mode, the supply current drops below 1 mA, reducing power consumption. For applications that require minimum ripple or fixed frequency, PFM Mode can be disabled using the MODE pin. The FAN53601/11 is available in 6−bump, 0.4 mm pitch, Wafer−Level Chip−Scale Package (WLCSP). Features • • • • • • • • • • • • • • April, 2022 − Rev. 3 MARKING DIAGRAM xx&K &.&2&Z xx &K &. &2 Z = Device Code = 2−Digits Lot Run Traceability Code = Pin One Dot = 2−Digit Date Code = Assembly Site MODE L1 470nH 4.7 mF SW FB A1 A2 B1 B2 C1 C2 VIN EN GND CIN 2.2 mF COUT Figure 1. Typical Application ORDERING INFORMATION 600 mA or 1 A Output Current Capability 24 mA Typical Quiescent Current 6 MHz Fixed−Frequency Operation Best−in−Class Load Transient Response Best−in−Class Efficiency 2.3 V to 5.5 V Input Voltage Range Low Ripple Light−Load PFM Mode Forced PWM and External Clock Synchronization Internal Soft−Start Input Under−Voltage Lockout (UVLO) Thermal Shutdown and Overload Protection Optional Output Discharge 6−Bump WLCSP, 0.4 mm Pitch These are Pb−Free and Halid Free Devices © Semiconductor Components Industries, LLC, 2010 WLCSP6 1.16 y 0.86 y 0.586 CASE 567RQ See detailed ordering and shipping information on page 2 of this data sheet. Applications • 3G, 4G, WiFi®, WiMAXt, and WiBrot Data Cards • Tablets • DSC, DVC • Netbooks, Ultra−Mobile PCs 1 Publication Order Number: FAN53611/D FAN53601, FAN53611 ORDERING INFORMATION Output Voltage (Note 1) Max. Output Current Active Discharge (Note 2) Max. VIN Package FAN53601AUC10X 1.000 V 600 mA Yes 5.5 V FAN53601AUC105X 1.050 V 600 mA Yes WLCSP6 (Pb−Free) FAN53611AUC11X 1.100 V 1A Yes FAN53611AUC115X 1.150 V 1A Yes FAN53611AUC13X 1.300 V 1A Yes FAN53611AUC135X 1.350 V 1A Yes FAN53611UC123X 1.233 V 1A No FAN53601UC182X 1.820 V 600 mA No FAN53611AUC205X 2.050 V 1A Yes FAN53611AUC123X 1.233 V 1A Yes FAN53611AUC12X 1.200 V 1A Yes FAN53611AUC18X 1.800 V 1A Yes Part Number Temperature Range −40 to +85°C Shipping† 3000 / Tape & Reel †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specification Brochure, BRD8011/D. 1. Other voltage options available on request. Contact a onsemi representative. 2. All voltage and output current options are available with or without active discharge. Contact a onsemi representative. Pin Configurations MODE A1 A2 VIN VIN A2 A1 MODE SW B1 B2 EN EN B2 B1 SW FB C1 C2 GND GND C2 C1 FB Figure 2. Bumps Facing Down Figure 3. Bumps Facing Up PIN DEFINITIONS Pin No. Name A1 MODE Description MODE. Logic 1 on this pin forces the IC to stay in PWM Mode. A logic 0 allows the IC to automatically switch to PFM during light loads. The regulator also synchronizes its switching frequency to four times the frequency provided on this pin. Do not leave this pin floating. B2 SW Switching Node. Connect to output inductor. C1 FB Feedback / VOUT. Connect to output voltage. C2 GND B2 EN Enable. The device is in Shutdown Mode when voltage to this pin is < 0.4 V and enabled when > 1.2 V. Do not leave this pin floating. A2 VIN Input Voltage. Connect to input power source. Ground. Power and IC ground. All signals are referenced to this pin. www.onsemi.com 2 FAN53601, FAN53611 ABSOLUTE MAXIMUM RATINGS Symbol Min Max Unit VIN Input Voltage −0.3 7.0 V VSW Voltage on SW Pin −0.3 VIN + 0.3 (Note 3) V EN and MODE Pin Voltage −0.3 VIN + 0.3 (Note 3) V Other Pins −0.3 VIN + 0.3 (Note 3) V VCTRL ESD Parameter Electrostatic Discharge Protection Level Human Body Model per JESD22−A114 2.0 Charged Device Model per JESD22−C101 1.5 kV TJ Junction Temperature −40 +150 °C TSTG Storage Temperature −65 +150 °C − +260 °C TL Lead Soldering Temperature, 10 Seconds Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed, damage may occur and reliability may be affected. 3. Lesser of 7 V or VIN +0.3 V. RECOMMENDED OPERATING CONDITIONS Symbol Parameter Min Typ Max Unit 2.3 − 5.5 V Output Current for FAN53601 0 − 600 mA Output Current for FAN53611 0 − 1 A Inductor − 470 − nH Input Capacitor − 2.2 − mF VCC Supply Voltage Range IOUT L CIN COUT Output Capacitor 1.6 4.7 12.0 mF TA Operating Ambient Temperature −40 − +85 °C TJ Operating Junction Temperature −40 − +125 °C Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond the Recommended Operating Ranges limits may affect device reliability. THERMAL CHARACTERISTICS Symbol qJA NOTE: Parameter Junction−to−Ambient Thermal Resistance Value Unit 125 °C/W Junction−to−ambient thermal resistance is a function of application and board layout. This data is measured with four−layer 2s2p boards in accordance to JEDEC standard JESD51. Special attention must be paid to not exceed junction temperature TJ(max) at a given ambient temperature TA. www.onsemi.com 3 FAN53601, FAN53611 ELECTRICAL CHARACTERISTICS Minimum and maximum values are at VIN = VEN = 2.3 V to 5.5 V, VMODE = 0 V (AUTO Mode), TA = −40°C to +85°C; circuit of Figure 1, unless otherwise noted. Typical values are at TA = 25°C, VIN = VEN = 3.6 V. Parameter Symbol Test Condition Min Typ Max Unit No Load, Not Switching − 24 50 mA PWM Mode − 8 − mA POWER SUPPLIES IQ I(SD) Quiescent Current Shutdown Supply Current EN = GND, VIN = 3.6 V − 0.25 1.00 mA VUVLO Under−Voltage Lockout Threshold Rising VIN − 2.15 2.27 V VUVHYST Under−Voltage Lockout Hysteresis − 200 − mV − − V LOGIC INPUTS: EN AND MODE PINS VIH Enable HIGH−Level Input Voltage 1.2 VIL Enable LOW−Level Input Voltage − − 0.4 V VLHYST Logic Input Hysteresis Voltage − 100 − mV IIN Enable Input Leakage Current − 0.01 1.00 mA Pin to VIN or GND SWITCHING AND SYNCHRONIZATION fSW Switching Frequency (Note 4) VIN = 3.6 V, TA = 25C, PWM Mode, ILOAD = 10 mA 5.4 6.0 6.6 MHz fSYNC MODE Synchronization Range (Note 4) Square Wave at MODE Input 1.3 1.5 1.7 MHz Output Voltage Accuracy ILOAD = 0 to 600 mA 0.953 1.000 1.048 V PWM Mode 0.967 1.000 1.034 ILOAD = 0 to 1 A 1.298 1.350 1.402 PWM Mode 1.309 1.350 1.391 ILOAD = 0 to 1 A 1.185 1.233 1.281 PWM Mode 1.192 1.233 1.274 ILOAD = 0 to 600 mA 1.755 1.820 1.885 PWM Mode 1.781 1.820 1.859 ILOAD = 0 to 1 A 1.054 1.100 1.147 PWM Mode 1.061 1.100 1.140 ILOAD = 0 to 1 A 1.250 1.300 1.350 PWM Mode 1.259 1.300 1.341 ILOAD = 0 to 1 A 1.104 1.150 1.196 PWM Mode 1.110 1.150 1.190 ILOAD = 0 to 600 mA 1.003 1.050 1.097 PWM Mode 1.016 1.050 1.084 ILOAD = 0 to 1 A, VIN = 2.7 to 5.5 V 1.973 2.050 2.127 PWM Mode, VIN = 2.7 to 5.5 V 2.004 2.050 2.096 ILOAD = 0 to 1 A 1.152 1.200 1.248 PWM Mode 1.160 1.200 1.240 ILOAD = 0 to 1 A 1.732 1.800 1.868 PWM Mode 1.756 1.800 1.844 − 180 300 REGULATION VO 1.000 V 1.35 V 1.233 V 1.820 V 1.100 V 1.300 V 1.150 V 1.050 V 2.050 V 1.200 V 1.800 V tSS Soft−Start VIN = 4.5 V, from EN Rising Edge www.onsemi.com 4 ms FAN53601, FAN53611 ELECTRICAL CHARACTERISTICS (continued) Minimum and maximum values are at VIN = VEN = 2.3 V to 5.5 V, VMODE = 0 V (AUTO Mode), TA = −40°C to +85°C; circuit of Figure 1, unless otherwise noted. Typical values are at TA = 25°C, VIN = VEN = 3.6 V. (continued) Symbol Parameter Test Condition Min Typ Max Unit mW OUTPUT DRIVER RDS(on) ILIM(OL) PMOS On Resistance VIN = VGS = 3.6 V − 175 − NMOS On Resistance VIN = VGS = 3.6 V − 165 − PMOS Peak Current Limit Open−Loop for FAN53601, VIN = 3.6 V, TA = 25°C 900 1100 1250 Open−Loop for FAN53611, VIN = 3.6 V, TA = 25°C 1500 1750 2000 − 230 − W − 150 − °C 15 − °C RDIS Output Discharge Resistance TTSD Thermal Shutdown THYS Thermal Shutdown Hysteresis EN = GND mA Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product performance may not be indicated by the Electrical Characteristics if operated under different conditions. 4. Limited by the effect of tOFF minimum (see Operation Description section). 5. The Electrical Characteristics table reflects open−loop data. Refer to the Operation Description and Typical Characteristics Sections for closed−loop data. www.onsemi.com 5 FAN53601, FAN53611 TYPICAL CHARACTERISTICS Unless otherwise noted, VIN = VEN = 3.6 V, VMODE = 0 V (AUTO Mode), VOUT = 1.82 V, and TA = 25°C. 95% Efficiency Efficiency 90% 85% 80% 2.7 VIN 3.6 VIN 4.2 VIN 5.0 VIN 75% 70% 0 200 400 600 800 1000 92% 90% 88% 86% 84% 82% 80% 78% 76% 74% 72% 70% 68% 66% 64% 62% 60% −40°C, AUTO +25°C, AUTO +85°C, AUTO −40°C, PWM +25°C, PWM +85°C, PWM 0 200 2.7 VIN 3.6 VIN 4.2 VIN 5.0 VIN 200 400 600 800 1000 90% 88% 86% 84% 82% 80% 78% 76% 74% 72% 70% 68% 66% 64% 62% 60% 0 200 Efficiency Output Regulation (%) 0 −1 −2 0 100 200 300 400 600 1000 800 Figure 7. Efficiency vs. Load Current and Temperature, VOUT = 1.23 V, Auto Mode, Dotted for FPWM 2.7 VIN, AUTO 3.6 VIN, AUTO 4.2 VIN, AUTO 5.0 VIN, AUTO 2.7 VIN , PWM 3.6 VIN , PWM 4.2 VIN , PWM 5.0 VIN, PWM 1 400 Load Current (mA) Figure 6. Efficiency vs. Load Current and Input Voltage, VOUT = 1.23 V, Auto Mode, Dotted for Decreasing Load 2 1000 −40°C, AUTO +25°C, AUTO +85°C, AUTO −40°C, PWM +25°C, PWM +85°C, PWM Load Current (mA) 3 800 Figure 5. Efficiency vs. Load Current and Temperature, Auto Mode, Dotted for FPWM Efficiency Efficiency Figure 4. Efficiency vs. Load Current and Input Voltage, Auto Mode, Dotted for Decreasing Load 0 600 Load Current (mA) Load Current (mA) 90% 88% 86% 84% 82% 80% 78% 76% 74% 72% 70% 68% 66% 64% 400 500 600 90% 88% 86% 84% 82% 80% 78% 76% 74% 72% 70% 68% 66% 64% 2.7 VIN 3.6 VIN 4.2 VIN 5.0 VIN 0 100 200 300 400 500 600 Load Current (mA) Load Current (mA) Figure 9. Efficiency vs. Load Current, VOUT = 1.00 V, Dotted for Decreasing Load Figure 8. Output Regulation vs. Load Current, VOUT = 1.00 V, Dotted for Auto Mode www.onsemi.com 6 FAN53601, FAN53611 TYPICAL CHARACTERISTICS (continued) Unless otherwise noted, VIN = VEN = 3.6 V, MODE = 0 V (AUTO Mode), VOUT = 1.82 V, and TA = 25°C. 3 2.7 VIN, AUTO 3.6 VIN, AUTO 4.2 VIN, AUTO 5.0 VIN, AUTO 2.7 VIN , PWM 3.6 VIN , PWM 4.2 VIN , PWM 5.0 VIN, PWM 2 1 0 Output Regulation (%) Output Regulation (%) 3 −1 −2 0 200 400 600 800 2 1 0 −1 −2 1000 2.7 VIN, AUTO 3.6 VIN, AUTO 4.2 VIN, AUTO 5.0 VIN, AUTO 2.7 VIN , PWM 3.6 VIN , PWM 4.2 VIN , PWM 5.0 VIN, PWM 0 200 400 350 350 300 300 250 200 150 2.5 3.5 4.0 4.5 5.0 250 200 150 100 PWM PFM 3.0 PWM PFM 50 2.5 5.5 3.0 3.5 Figure 12. PFM / PWM Boundary vs. Input Voltage 5.0 5.5 15 −40°C, EN = VIN +25°C, EN = VIN +85°C, EN = VIN −40°C, EN = 1.8 V +25°C, EN = 1.8 V +85°C, EN = 1.8 V 12 25 20 −40°C +25°C +85°C 9 6 3 15 2.5 4.5 Figure 13. PFM / PWM Boundary vs. Input Voltage, VOUT = 1.23 V Input Current (mA) Input Current (mA) 30 4.0 Input Voltage (V) Input Voltage (V) 35 1000 Figure 11. DVOUT (%) vs. Load Current and Input Voltage, VOUT = 1.23 V, Normalized to 3.6 VIN, 500 mA Load, FPWM, Dotted for Auto Mode Load Current (mA) Load Current (mA) Figure 10. DVOUT (%) vs. Load Current and Input Voltage, Normalized to 3.6 VIN, 500 mA Load, FPWM, Dotted for Auto Mode 50 800 Load Current (mA) Load Current (mA) 100 600 0 3.0 3.5 4.0 4.5 5.0 2.5 5.5 3.0 3.5 4.0 4.5 5.0 5.5 Input Voltage (V) Input Voltage (V) Figure 15. Quiescent Current vs. Input Voltage and Temperature, Mode = EN = VIN (FPWM) Figure 14. Quiescent Current vs. Input Voltage and Temperature, Auto Mode; EN = VIN Solid, Dotted for EN = 1.8 V (−405C, +255C, +855C) www.onsemi.com 7 FAN53601, FAN53611 TYPICAL CHARACTERISTICS (continued) Unless otherwise noted, VIN = VEN = 3.6 V, MODE = 0 V (AUTO Mode), VOUT = 1.82 V, and TA = 25°C. 7.500 2.7 VIN, AUTO 3.6 VIN, AUTO 5.0 VIN, AUTO 2.7 VIN , PWM 3.6 VIN , PWM 5.0 VIN , PWM 20 15 Switching Frequency (kHz) Output Ripple (mVpp) 25 10 5 0 0 200 400 600 800 6.000 4.500 2.7 VIN, AUTO 3.6 VIN, AUTO 5.0 VIN, AUTO 2.7 VIN , PWM 3.6 VIN , PWM 5.0 VIN , PWM 3.000 1.500 0 1000 0 200 400 600 800 1000 Load Current (mA) Load Current (mA) Figure 16. Output Ripple vs. Load Current and Input Voltage, FPWM, Dotted for Auto Mode Figure 17. Frequency vs. Load Current and Input Voltage, Auto Mode, Dotted for FPWM Figure 18. Load Transient, 10−200−10 mA, 100 ns Edge Figure 19. Load Transient, 200−800−200 mA, 100 ns Edge Figure 20. Line Transient, 3.3−3.9−3.3 VIN, 10 ms Edge, 36 mA Load Figure 21. Line Transient, 3.3−3.9−3.3 VIN, 10 ms Edge, 600 mA Load www.onsemi.com 8 FAN53601, FAN53611 TYPICAL CHARACTERISTICS (continued) Unless otherwise noted, VIN = VEN = 3.6 V, MODE = 0 V (AUTO Mode), VOUT = 1.82 V, and TA = 25°C. Figure 22. Combined Line / Load Transient, 3.9−3.3 VIN, 10 ms Edge, 36−400 mA Load, 100 ns Edge Figure 23. Combined Line / Load Transient, 3.3−3.9 VIN, 10 ms Edge, 400−36 mA Load, 100 ns Edge Figure 24. Startup, 50 W Load Figure 25. Startup, 3 W Load Figure 27. Shutdown, No Load, Output Discharge Enabled Figure 26. Shutdown, 10 kW Load, No Output Discharge www.onsemi.com 9 FAN53601, FAN53611 TYPICAL CHARACTERISTICS (continued) Unless otherwise noted, VIN = VEN = 3.6 V, MODE = 0 V (AUTO Mode), VOUT = 1.82 V, and TA = 25°C. Figure 28. Over−Current, Load Increasing Past Current Limit, FAN53601 Figure 29. 250 mW Fault, Rapid Fault, Hiccup, FAN53601 Figure 30. Over−Current, Load Increasing Past Current Limit, FAN53611 Figure 31. 250 mW Fault, Rapid Fault, Hiccup, FAN53611 70 70 36 mA Load 600 mA Load 60 PSRR (dB) PSRR (dB) 60 50 40 0.1 50 40 30 30 20 24 mA Load 500 mA Load 1 10 100 20 0.1 1000 1 10 100 1000 Frequency (kHz) Frequency (kHz) Figure 33. PSRR, 50 W and 3 W Load, VOUT = 1.23 V Figure 32. PSRR, 50 W and 3 W Load www.onsemi.com 10 FAN53601, FAN53611 OPERATION DESCRIPTION The current−limit fault response protects the IC in the event of an over−current condition present during soft−start. As a result, the IC may fail to start if heavy load is applied during startup and/or if excessive COUT is used. The current required to charge COUT during soft−start commonly referred to as “displacement current” is given as: The FAN53601/11 is a 6 MHz, step−down switching voltage regulator available in 600 mA or 1 A options that delivers a fixed output from an input voltage supply of 2.3 V to 5.5 V. Using a proprietary architecture with synchronous rectification, the FAN53601/11 is capable of delivering a peak efficiency of 92%, while maintaining efficiency over 80% at load currents as low as 1 mA. The regulator operates at a nominal fixed frequency of 6 MHz, which reduces the value of the external components to as low as 470 nH for the output inductor and 4.7 mF for the output capacitor. In addition, the PWM modulator can be synchronized to an external frequency source. I DISP + C OUT @ dV dt (eq. 1) dV refers to the soft−start slew rate. dt To prevent shut down during soft−start, the following condition must be met: where Control Scheme I DISP ) I LOAD t I MAX(DC) The FAN53601/11 uses a proprietary, non−linear, fixed−frequency PWM modulator to deliver a fast load transient response, while maintaining a constant switching frequency over a wide range of operating conditions. The regulator performance is independent of the output capacitor ESR, allowing for the use of ceramic output capacitors. Although this type of operation normally results in a switching frequency that varies with input voltage and load current, an internal frequency loop holds the switching frequency constant over a large range of input voltages and load currents. For very light loads, the FAN53601/11 operates in Discontinuous Current Mode (DCM) single−pulse PFM Mode, which produces low output ripple compared with other PFM architectures. Transition between PWM and PFM is seamless, allowing for a smooth transition between DCM and CCM. Combined with exceptional transient response characteristics, the very low quiescent current of the controller maintains high efficiency; even at very light loads; while preserving fast transient response for applications requiring tight output regulation. (eq. 2) where IMAX(DC) is the maximum load current the IC is guaranteed to support. Startup into Large COUT Multiple soft−start cycles are required for no−load startup if COUT is greater than 15 mF. Large COUT requires light initial load to ensure the FA N53601/11 starts appropriately. The IC shuts down for 1.3 ms w hen IDISP exceeds ILIMIT for more than 200 ms of current limit. The IC then begins a new soft−start cycle. Since COUT retains its charge w hen the IC is off, the IC reaches regulation after multiple soft−start attempts. MODE Pin Logic 1 on this pin forces the IC to stay in PWM Mode. A logic 0 allow s the IC to automatically sw itch to PFM during light loads. If the MODE pin is toggled w ith a frequency between 1.3 MHz and 1.7 MHz, the converter synchronizes its sw itching frequency to four times the frequency on the MODE pin. The MODE pin is internally buffered w ith a Schmitt trigger, which allows the MODE pin to be driven w ith slow rise and fall times. An asymmetric duty cycle for frequency synchronization is also permitted as long as the minimum time below VIL(MAX) or above VIH(MAX) is 100 ns. Enable and Soft−Start When EN is LOW, all circuits are off and the IC draws ~250 nA of current. When EN is HIGH and VIN is above its UVLO threshold, the regulator begins a soft−start cycle. The output ramp during soft−start is a fixed slew rate of 50 mV/ms from Vout = 0 to 1 V, then 12.5 mV/ms until the output reaches its setpoint. Regardless of the state of the MODE pin, PFM Mode is enabled to prevent current from being discharged from COUT if soft−start begins when COUT is charged. In addition, all voltage options can be ordered with a feature that actively discharges FB to ground through a 230 W path when EN is LOW. Raising EN above its threshold voltage activates the part and starts the soft−start cycle. During soft−start, the internal reference is ramped using an exponential RC shape to prevent overshoot of the output voltage. Current limiting minimizes inrush during soft−start. Current Limit, Fault Shutdown, and Restart A heavy load or short circuit on the output causes the current in the inductor to increase until a maximum current threshold is reached in the high−side sw itch. Upon reaching this point, the high−side sw itch turns off, preventing high currents from causing damage. The regulator continues to limit the current cycle−by−cycle. After 16 cycles of current limit, the regulator triggers an over−current fault, causing the regulator to shut dow n for about 1.3 ms before attempting a restart. If the fault is caused by short circuit, the soft−start circuit attempts to restart and produces an over−current fault after about 200 ms, which results in a duty cycle of less than 15%, limiting pow er dissipation. www.onsemi.com 11 FAN53601, FAN53611 The closed−loop peak−current limit is not the same as the open−loop tested current limit, ILIM(OL), in the Electrical Characteristics table. This is primarily due to the effect of propagation delays of the IC current limit comparator. The calculation for switching frequency is given by: f SW + min where: Under−Voltage Lockout (UVLO) When EN is HIGH, the under−voltage lockout keeps the part from operating until the input supply voltage rises high enough to properly operate. This ensures no misbehavior of the regulator during startup or shutdown. tOFF(MIN) is 40 ns. This imposes constraints on the V maximum OUT that the FAN53601/11 can provide or the V IN maximum output voltage it can provide at low VIN while maintaining a fixed switching frequency in PWM Mode. When VIN is LOW, fixed switching is maintained as long as: V OUT v * t OFF(MIN) @ f SW [ 0.7. V IN The switching frequency drops when the regulator cannot provide sufficient duty cycle at 6 MHz to maintain regulation. This occurs when VOUT is 1.82 V and VIN is below 2.7 V at high load currents (see Figure 34). Switching Frequency (kHz) 7.500 6.000 4.500 3.000 1.500 400 600 800 V OUT ) I OUT @ R OFF V IN * I OUT @ R ON * V OUT where: ROFF = RDSON_N + DCRL RON = RDSON_P + DCRL Minimum Off−Time Effect on Switching Frequency 200 Ǔ (eq. 3) Ǔ (eq. 4) When the die temperature increases, due to a high load condition and/or a high ambient temperature; the output switching is disabled until the die temperature falls sufficiently. The junction temperature at which the thermal shutdown activates is nominally 150°C with a 15°C hysteresis. 0 1 , 6 MHz t SW(MAX) t SW(MAX) + 40 ns @ 1 ) Thermal Shutdown (TSD) 0 ǒ ǒ 1000 Load Current (mA) Figure 34. Frequency vs. Load Current to Demonstrate tOFFMIN Effect, VIN = 2.3 V and 2.7 V, VOUT = 1.82 V, Auto Mode, FPWM Dotted www.onsemi.com 12 FAN53601, FAN53611 APPLICATIONS INFORMATION Selecting the Inductor The increased RMS current produces higher losses through the RDS(ON) of the IC MOSFETs, as well as the inductor DCR. Increasing the inductor value produces lower RMS currents, but degrades transient response. For a given physical inductor size, increased inductance usually results in an inductor with lower saturation current and higher DCR. Table 1 shows the effects of inductance higher or lower than the recommended 1 mH on regulator performance. The output inductor must meet both the required inductance and the energy−handling capability of the application. The inductor value affects average current limit, the PWM−to−PFM transition point, output voltage ripple, and efficiency. The ripple current (DI) of the regulator is: DI [ V OUT V IN @ ǒ V IN * V OUT L @ f SW Ǔ (eq. 5) Output Capacitor The maximum average load current, IMAX(LOAD), is related to the peak current limit, ILIM(PK), by the ripple current, given by: I MAX(LOAD) + I LIM(PK) * DI 2 Table 2 suggests 0402 capacitors. 0603 capacitors may further improve performance in that the effective capacitance is higher. This improves transient response and output ripple. Increasing COUT has no effect on loop stability and can therefore be increased to reduce output voltage ripple or to improve transient response. Output voltage ripple, DVOUT, is: (eq. 6) The transition between PFM and PWM operation is determined by the point at which the inductor valley current crosses zero. The regulator DC current when the inductor current crosses zero, IDCM, is: I DCM + DI 2 DV OUT + DI L ǸI OUT(DC) f SW @ C OUT @ ESR 2 2 @ D @ (1 * D) (eq. 7) 2 ) DI 2 12 ) 1 8 @ f SW @ C OUT ƫ (eq. 9) The FAN53601/11 is optimized for operation with L = 470 nH, but is stable with inductances up to 1 mH (nominal). The inductor should be rated to maintain at least 80% of its value at ILIM(PK). Efficiency is affected by the inductor DCR and inductance value. Decreasing the inductor value for a given physical size typically decreases the DCR; but because DI increases, the RMS current increases, as do the core and skin effect losses. I RMS + ƪ Input Capacitor The 2.2 mF ceramic input capacitor should be placed as close as possible between the VIN pin and GND to minimize the parasitic inductance. If a long wire is used to bring power to the IC, additional “bulk” capacitance (electrolytic or tantalum) should be placed between CIN and the power source lead to reduce the ringing that can occur between the inductance of the power source leads and CIN. The effective capacitance value decreases as VIN increases due to DC bias effects. (eq. 8) Table 1. EFFECTS OF CHANGES IN INDUCTOR VALUE (FROM 470 nH RECOMMENDED VALUE) ON REGULATOR PERFORMANCE Inductor Value IMAX(LOAD) DVOUT Transient Response Increase Increase Decrease Degraded Decrease Decrease Increase Improved Table 2. RECOMMENDED PASSIVE COMPONENTS AND THEIR VARIATION DUE TO DC BIAS Component Description Vendor Min Typ Max L1 470 nH, 2012, 90 mW, 1.1 A Murata LQM21PNR47MC0 Murata LQM21PNR54MG0 Hitachi Metals HLSI 201210R47 300 nH 470 nH 520 nH CIN 2.2 mF, 6.3 V, X5R, 0402 Murata or Equivalent GRM155R60J225ME15 GRM188R60J225KE19D 1.0 mF 2.2 mF − COUT 4.7 mF, X5R, 0402 Murata or Equivalent GRM155R60G475M GRM155R60E475ME760 1.6 mF 4.7 mF − www.onsemi.com 13 FAN53601, FAN53611 PCB Layout Guidelines IC do not behave erratically due to excessive noise. This reduces switching cycle jitter and ensures good overall performance. It is important to place the common GND of CIN and COUT as close as possible to the C2 terminal. There is some flexibility in moving the inductor further away from the IC; in that case, VOUT should be considered at the COUT terminal. There are only three external components: the inductor and the input and output capacitors. For any buck switcher IC, including the FAN53601/11, it is important to place a low−ESR input capacitor very close to the IC, as shown in Figure 35. The input capacitor ensures good input decoupling, which helps reduce noise appearing at the output terminals and ensures that the control sections of the Figure 35. PCB Layout Guidance The following information applies to the WLCSP package dimensions on the next page: PRODUCT−SPECIFIC DIMENSIONS D E X Y 1.160 ±0.030 0.860 ±0.030 0.230 0.180 Wi−Fi and the Wi−Fi logo are registered trademarks of the Wi−Fi WIBRO is a trademark and brand of Telecommunications Technology Association. WIMAX is a trademark of WiMAX Forum. All brand names and product names appearing in this document are registered trademarks or trademarks of their respective holders. www.onsemi.com 14 MECHANICAL CASE OUTLINE PACKAGE DIMENSIONS WLCSP6 1.16x0.86x0.586 CASE 567QE ISSUE O DOCUMENT NUMBER: DESCRIPTION: 98AON13324G WLCSP6 1.16x0.86x0.586 DATE 31 OCT 2016 Electronic versions are uncontrolled except when accessed directly from the Document Repository. Printed versions are uncontrolled except when stamped “CONTROLLED COPY” in red. PAGE 1 OF 1 ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries. ON Semiconductor reserves the right to make changes without further notice to any products herein. ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. ON Semiconductor does not convey any license under its patent rights nor the rights of others. © Semiconductor Components Industries, LLC, 2019 www.onsemi.com MECHANICAL CASE OUTLINE PACKAGE DIMENSIONS WLCSP6 1.16x0.86x0.586 CASE 567RQ ISSUE A DOCUMENT NUMBER: DESCRIPTION: 98AON16583G WLCSP6 1.16x0.86x0.586 DATE 12 JAN 2018 Electronic versions are uncontrolled except when accessed directly from the Document Repository. Printed versions are uncontrolled except when stamped “CONTROLLED COPY” in red. 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