Is Now Part of To learn more about ON Semiconductor, please visit our website at www.onsemi.com Please note: As part of the Fairchild Semiconductor integration, some of the Fairchild orderable part numbers will need to change in order to meet ON Semiconductor’s system requirements. Since the ON Semiconductor product management systems do not have the ability to manage part nomenclature that utilizes an underscore (_), the underscore (_) in the Fairchild part numbers will be changed to a dash (-). This document may contain device numbers with an underscore (_). Please check the ON Semiconductor website to verify the updated device numbers. The most current and up-to-date ordering information can be found at www.onsemi.com. Please email any questions regarding the system integration to [email protected]. ON Semiconductor and the ON Semiconductor logo are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries. ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. 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. Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards, regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON Semiconductor data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. FAN5362 3MHz, 500mA / 750mA Synchronous Buck Regulator Features Description 3MHz Fixed-Frequency Operation The FAN5362 is a 500mA or 750mA, step-down, switching voltage regulator that delivers a fixed output voltage from an input voltage supply of 2.7V to 5.5V. Using a proprietary architecture with synchronous rectification, the FAN5362 is capable of delivering a peak efficiency of 96%, while maintaining efficiency over 90% with load currents as low as 1mA. PFM Mode for High Efficiency in Light Load 45µA Typical Quiescent Current 1.80 to 3.6V Fixed Output Voltage 500mA or 750mA Output Current Capability 2.7V to 5.5V Input Voltage Range Smooth Transitions to/from 100% Duty Cycle when VIN Drops Best-in-Class Load Transient Response Best-in-Class Efficiency Forced PWM and External Clock Synchronization Internal Soft-Start Input Under-Voltage Lockout (UVLO) Thermal Shutdown and Overload Protection 6-Bump WLCSP, 0.4mm Pitch or 6-Lead 2 x 2mm Ultrathin Molded Leadless Package Applications SD Flash Memory Power Supply RF Transceiver Power Cell Phones, Smart Phones Tablets, Netbooks®, Ultra-Mobile PCs 3G, LTE, WiMAX™, WiBro®, and WiFi® Data Cards This regulator transitions seamlessly into and out of 100% duty cycle operation when the supply dips to or below the regulation setpoint and smoothly recovers full regulation without overshoot when the supply recovers. The regulator operates at a nominal fixed frequency of 3MHz, which reduces the value of the external components to 1µH for the output inductor and 4.7µF for the output capacitor. The PWM modulator can be synchronized to an external frequency source. At moderate and light loads, pulse frequency modulation is used to operate the device in power-save mode with a typical quiescent current of 45µA. 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 3MHz. In shutdown mode, the supply current drops below 1µA, reducing power consumption. For applications that require minimum ripple or fixed frequency, PFM mode can be disabled using the MODE pin. The FAN5362 is available in 6-bump, 0.4mm pitch, WaferLevel Chip-Scale Package (WLCSP) and 6-Lead 2 x 2mm Ultrathin Molded Leadless Package (UMLP). Gaming Devices, Digital Cameras DC/DC Micro Modules MODE L1 SW 1µH FB F A1 A2 B1 B2 C1 C2 VIN CIN 2.2 F EN GND COUT Figure 1. Typical Application Trademarks are the property of their respective owners. © 2009 Fairchild Semiconductor Corporation FAN5362 • Rev. 1.0.5 www.fairchildsemi.com FAN5362 — 3MHz, 500mA / 750mA Synchronous Buck Regulator July 2012 Part Number Output Voltage(1) Output Current (mA) FAN5362UC21X(2) 2.1 750 (2) 2.5 500 FAN5362UC27X 2.7 500 FAN5362UC29X 2.9 500 FAN5362UC33X 3.3 500 FAN5362UMP29X 2.9 500 FAN5362UMP33X 3.3 500 FAN5362UC25X Operating Temperature Range Packing Method Package WLCSP-6, 0.4mm Pitch -40 to 85°C Tape and Reel 6-Lead, 2 x 2mm UMLP Note: 1. Other voltage options available on request. Contact a Fairchild representative. 2. Preliminary; not full production release at this time. Contact a Fairchild representative for information. Table 1. Recommended Components for Circuit in Figure 1 Component Description Example Part Typical L1 1H, 2012, 190m, 800mA Murata LQM21PN1R0MC0 1H 2.2F, 6.3V, X5R, 0402 Murata GRM155R60J225ME15 2.2F, 6.3V, X5R, 0603 GRM188R60J225KE19D 4.7F, X5R, 0603 Murata GRM188R60J475M 4.7F 10F, X5R, 0603 Murata GRM188R60J106ME47D 10.0F CIN COUT 2.2F Pin Configuration Figure 2. WLCSP, Bumps Facing Down Figure 3. WLCSP, Bumps Facing Up Figure 4. UMLP, Leads Facing Down Pin Definitions WLCSP Bump # A1 UMLP Pin # Name Description 3 MODE Logic 1 on this pin forces the IC to stay in PWM mode. Logic 0 allows the IC to automatically switch to PFM during light loads. The regulator also synchronizes its switching frequency to two times the frequency provided on this pin. Do not leave this pin floating. When tying HIGH, use at least 1kΩ series resistor if VIN is expected to exceed 4.5V. B1 2 SW Switching Node. Connect to output inductor. C1 1 FB Feedback / VOUT. Connect to output voltage. C2 6 GND B2 5 EN Enable. The device is in shutdown mode when voltage to this pin is <0.4V and enabled when >1.2V. Do not leave this pin floating. When tying HIGH, use at least 1kΩ series resistor if VIN is expected to exceed 4.5V. A2 4 VIN Input Voltage. Connect to input power source. © 2009 Fairchild Semiconductor Corporation FAN5362 • Rev. 1.0.5 Ground. Power and IC ground. All signals are referenced to this pin. www.fairchildsemi.com 2 FAN5362 — 3MHz, 500mA / 750mA Synchronous Buck Regulator Ordering Information Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. Symbol VIN VSW VCTRL Parameter Input Voltage Voltage on SW Pin Min. Max. –0.3 6.5 –0.3 EN and MODE Pin Voltage –0.3 VFB FB Pin –0.3 ESD Electrostatic Discharge Protection Level Unit V (3) V (3) V VIN + 0.3 VIN + 0.3 4 Human Body Model per JESD22-A114 3.0 Charged Device Model per JESD22-C101 1.5 V kV TJ Junction Temperature –40 +150 °C TSTG Storage Temperature –65 +150 °C +260 °C TL Lead Soldering Temperature, 10 Seconds Note: 3. Lesser of 6.5V or VIN+0.3V. Recommended Operating Conditions The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to Absolute Maximum Ratings. Symbol VCC IOUT L CIN COUT Parameter Min. Typ. (4) Supply Voltage Range Max. Unit V 2.7 5.5 Output Current for 2.1V 0 750 Output Current for 2.5V, 2.7V, 2.9V, 3.3V 0 500 Inductor 1 Input Capacitor 2.2 Output Capacitor 10 mA µH µF 24 μF TA Operating Ambient Temperature –40 +85 °C TJ Operating Junction Temperature –40 +125 °C Note: 4. Minimum VIN = VOUT + 200mV or 2.7V, whichever is greater. Thermal Properties Junction-to-ambient thermal resistance is a function of application and board layout. This data is measured with four-layer 1s2p boards in accordance to JEDEC standard JESD51. Special attention must be paid not to exceed junction temperature TJ(max) at a given ambient temperature TA. Symbol Parameter JA Junction-to-Ambient Thermal Resistance © 2009 Fairchild Semiconductor Corporation FAN5362 • Rev. 1.0.5 Typical WLSCP 150 UMLP 49 Unit °C/W www.fairchildsemi.com 3 FAN5362 — 3MHz, 500mA / 750mA Synchronous Buck Regulator Absolute Maximum Ratings Minimum and maximum values are at VIN = VEN = 2.7V to 5.5V, VMODE = 0V (AUTO Mode), TA = -40°C to +85°C; circuit of Figure 1, unless otherwise noted. Typical values are at TA = 25°C, VIN = VEN = 3.6V, VMODE = 0V, COUT=10µF. Symbol Parameter Conditions Min. Typ. Max. Unit No Load, Not Switching, VIN > 3V 45 75 µA PWM Mode 5 Shutdown Supply Current EN = GND 0.05 1.00 µA VUVLO Under-Voltage Lockout Threshold Rising VIN 2.5 2.6 V VUVHYST Under-Voltage Lockout Hysteresis Power Supplies IQ I(SD) Quiescent Current V(ENH) Enable HIGH-Level Input Voltage V(ENL) Enable LOW-Level Input Voltage I(EN) Enable Input Leakage Current V(MH) MODE HIGH-Level Input Voltage V(ML) MODE LOW-Level Input Voltage I(M) MODE Input Leakage Current mA 175 mV 1.05 EN to VIN or GND V 0.01 0.4 V 1.00 µA 1.05 MODE to VIN or GND V 0.4 V 0.01 1.00 µA Switching and Synchronization fSW fSYNC Switching Frequency(5) VIN = 3.6V, TA = 25°C 2.7 3.0 3.3 MHz MODE Synchronization Range(5) Square Wave at MODE Input 1.3 1.5 1.7 MHz ILOAD = 0 to 750mA 2.037 (-3%) 2.100 2.163 (+3%) ILOAD = 0 to 400mA, VIN ≥ VOUT + 200mV 2.375 (-5%) 2.500 2.575 (+3%) ILOAD = 0 to 500mA, VIN ≥ VOUT + 300mV 2.425 (-3%) 2.500 2.575 (+3%) ILOAD = 0 to 400mA, VIN ≥ VOUT + 150mV -5% +3% ILOAD = 0 to 500mA, VIN ≥ VOUT + 300mV -3% +3% Regulation 2.10V VO Output Voltage Accuracy 2.50V 2.70V, 2.90V, 3.30V tSS Soft-Start 300 V From EN Rising Edge 180 µs PMOS On Resistance VIN = VGS = 3.6V 330 m NMOS On Resistance VIN = VGS = 3.6V 300 m Output Driver RDS(on) ILIM(OL) PMOS Peak Current Limit(5) VOUT = 2.1V 1375 VOUT = 2.5V, 2.7V, 2.9V, 3.3V 800 1000 mA 1150 mA TTSD Thermal Shutdown 150 °C THYS Thermal Shutdown Hysteresis 15 °C Notes: 5. Limited by the effect of tOFF minimum (see Figure 8 in Typical Performance Characteristics). 6. The Electrical Characteristics table reflects open-loop data. Refer to the Operation Description and Typical Characteristics for closed-loop data. © 2009 Fairchild Semiconductor Corporation FAN5362 • Rev. 1.0.5 www.fairchildsemi.com 4 FAN5362 — 3MHz, 500mA / 750mA Synchronous Buck Regulator Electrical Characteristics Unless otherwise noted, VIN=VEN=3.6V,VMODE=0 (AUTO), VOUT=2.9V, COUT=10µF, and TA=25°C. 2.910 100% 98% 2.905 96% 92% VOUT (V) Efficiency 94% 90% 88% VIN = 3.2, Mode=0 86% 2.900 2.895 VIN = 3.6, Mode=0 VIN = 4.2, Mode=0 84% 2.890 VIN = 3.2, Mode=1 82% Auto 3.6VIN VIN = 3.6, Mode=1 Auto 3.2VIN VIN = 4.2, Mode=1 80% 1 10 100 2.885 1000 - 100 I LOAD Output Current (mA) Figure 5. Efficiency vs. Load Current and Input Supply 300 400 500 Figure 6. Load Regulation 90 3500 80 3.2VIN_Auto 70 3000 3.6VIN_AUTO Switching Frequency(kHz) VOUT ripple(mVpp) 200 I LOAD Output Current (mA) 60 50 40 30 3.2VIN_AUTO 2500 3.6VIN_AUTO 3.6VIN_FPWM 2000 3.2VIN_FPWM 1500 1000 20 500 10 0 0 0 0 100 200 300 400 50 100 500 150 200 250 300 350 400 450 500 Load Current(mA) Load current (mA) Figure 7. Ripple Figure 8. Effect of tOFF(MIN) on Reducing Switching Frequency 1300 450 400 1200 100 % d.c. Load Current (mA) 350 Peak Inductor Current (mA) 500 Always PWM 300 250 Hysteresis 200 150 Always PFM 100 50 1100 1000 900 800 ‐40C +25C 700 0 3 3.5 4 4.5 5 +85C 5.5 600 Input Voltage(V) 2.5 3.0 3.5 4.0 4.5 5.0 5.5 Input Voltage (V) Figure 9. PFM / PWM Boundaries © 2009 Fairchild Semiconductor Corporation FAN5362 • Rev. 1.0.5 Figure 10. Peak Inductor Current www.fairchildsemi.com 5 FAN5362 — 3MHz, 500mA / 750mA Synchronous Buck Regulator Typical Characteristics Unless otherwise noted, VIN=VEN=3.6V,VMODE=0 (AUTO), VOUT=2.9V, COUT=10µF, and TA=25°C. VOUT VOUT IL IL Figure 11. PFM to PWM Transition at VIN=3.2V, 10µs/div. Figure 12. PWM to PFM Transition at VIN=3.2V, 10µs/div. VOUT VOUT IL IL Figure 13. PFM to PWM Transition at VIN=3.6V, 2µs/div. Figure 14. PWM to PFM Transition at VIN=3.6V, 2µs/div. VOUT VOUT IL IL Figure 15. Regular Switching to 100% Duty Cycle Transition at VIN=3.2V, 5µs/div. © 2009 Fairchild Semiconductor Corporation FAN5362 • Rev. 1.0.5 Figure 16. 100% Duty Cycle to Regular Switching Transition at VIN=3.2V, 5µs/div. www.fairchildsemi.com 6 FAN5362 — 3MHz, 500mA / 750mA Synchronous Buck Regulator Typical Characteristics Unless otherwise noted, VIN=VEN=3.6V,VMODE=0 (AUTO), VOUT=2.9V, COUT=10µF, and TA=25°C. VIN EN VOUT VOUT IL IL Figure 17. Startup Ramping VIN=VEN with 500mA Load, 1ms/div. Figure 18. Startup and Shutdown through VEN with 500mA Load, 50µs/div. VIN VOUT VOUT IL IL ILOAD Figure 19. Line Transient at VIN=3.2V to 4.2V, 300mA Load, tRISE=tFALL=10µs, 20µs/div. Figure 20. Load Transient 0mA to 150mA, VIN=3.6V, tRISE=tFALL=100ns, 5µs/div. VOUT VOUT IL IL ILOAD ILOAD Figure 21. Load Transient 50mA to 250mA, VIN=3.6V, tRISE=tFALL=100ns, 5µs/div. © 2009 Fairchild Semiconductor Corporation FAN5362 • Rev. 1.0.5 Figure 22. Load Transient 150mA to 400mA, VIN=3.6V, tRISE=tFALL=100ns, 5µs/div. www.fairchildsemi.com 7 FAN5362 — 3MHz, 500mA / 750mA Synchronous Buck Regulator Typical Characteristics Unless otherwise noted, VIN=VEN=3.6V,VMODE=0 (AUTO), VOUT=2.9V, COUT=10µF, and TA=25°C. VOUT VOUT IL IL ILOAD ILOAD Figure 23. Load Transient 50mA to 250mA, VIN=3V, tRISE=tFALL=100ns, 5µs/div. Figure 24. Load Transient 150mA to 400mA, VIN=3V, tRISE=tFALL=100ns, 5µs/div. VIN VOUT IL Figure 25. Startup Ramping VIN=VEN, into Overload, Load=3, 5ms/div. © 2009 Fairchild Semiconductor Corporation FAN5362 • Rev. 1.0.5 www.fairchildsemi.com 8 FAN5362 — 3MHz, 500mA / 750mA Synchronous Buck Regulator Typical Characteristics FAN5362 is a 500mA or 750mA, step-down switching voltage regulator that delivers a fixed output voltage from an input voltage supply up to 5.5V. Using a proprietary architecture with synchronous rectification, FAN5362 is capable of delivering a peak efficiency above 96%, while maintaining efficiency above 90% at load currents as low as 1mA. The regulator operates at a nominal frequency of 3MHz at full load, which reduces the value of the external components to 1µH for the inductor and 4.7µF for the output capacitor. High efficiency is maintained at light load with single-pulse PFM mode. Synchronous rectification is inhibited during soft-start, allowing the IC to start into a pre-charged load. The IC may fail to start if heavy load is applied during startup and/or if excessive COUT is used. This is due to the currentlimit fault response, which protects the IC in the event of an over-current condition present during soft-start. The current required to charge COUT during soft-start is commonly referred to as “displacement current” and given as: IDISP C OUT Control Scheme where The FAN5362 uses a proprietary, non-linear, fixedfrequency 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. MODE Pin 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. If the MODE pin is toggled, the converter synchronizes its switching frequency to four times the frequency on the mode pin (fMODE). At startup, the mode pin must be held LOW or HIGH for at least 10s to ensure that the converter does not attempt to synchronize to this pin. Under-Voltage Lockout 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. When VIN approaches VOUT, the regulator increases its duty cycle until 100% duty cycle is reached. As the duty cycle approaches 100%, the switching frequency declines due to the minimum off-time (tOFF(MIN)) of about 35ns imposed by the control circuit. When 100% duty cycle is reached, VOUT follows VIN with a drop-out voltage (VDROPOUT) determined by the total resistance between VIN and VOUT: Current Limiting 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 switch. Upon reaching this point, the high-side switch turns off, preventing high currents from causing damage. 16 consecutive PWM cycles in current limit causes the regulator to shut down and stay off for about 2900s before attempting a restart. (1) To calculate the worst-case VDROPOUT, use the maximum PMOS RDS(ON) at high temperature from Figure 6. In the event of a short circuit, the soft-start circuit attempts to restart at 240s, which results in a duty cycle of less than 10%, providing current into a short. Enable and Soft Start When the EN pin is LOW, the IC is shut down and the part draws very little current. In addition, during shutdown, FB is actively discharged to ground through a 230 path. 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 any overshoot of the output voltage. Current limiting minimizes inrush during soft-start. © 2009 Fairchild Semiconductor Corporation FAN5362 • Rev. 1.0.5 (3) where IMAX(DC) is the maximum load current the IC is guaranteed to support (500mA or 750mA). 100% Duty Cycle Operation dV refers to the soft-start slew rate. dt IDISP ILOAD IMAX(DC) Combined with exceptional transient response characteristics, the very low quiescent current of the controller (45µA) maintains high efficiency, even at very light loads, while preserving fast transient response for applications requiring tight output regulation. (2) To prevent shutdown during soft-start, the following condition must be met: For very light loads, the FAN5362 operates in discontinuous current (DCM) single-pulse PFM mode, which produces low output ripple compared with other PFM architectures. Transition between PWM and PFM is seamless, with a glitch of less than 18mV at VOUT during the transition between DCM and CCM modes. VDROPOUT ILOAD PMOS R DS( ON) DCR L dV dt The closed-loop peak-current limit, ILIM(PK), 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. www.fairchildsemi.com 9 FAN5362 — 3MHz, 500mA / 750mA Synchronous Buck Regulator Operation Description When the die temperature increases, due to a high load condition and/or a high ambient temperature, the output switching is disabled until the temperature on the die has fallen sufficiently. The junction temperature at which the thermal shutdown activates is nominally 150°C with a 20°C hysteresis. Efficiency is affected by the inductor DCR and inductance value. Decreasing the inductor value for a given physical size typically decreases the DCR; but since ∆I increases, the RMS current increases, as do the core and skin effect losses. Minimum Off-Time Effect on Switching Frequency IRMS tOFF(MIN) is 35ns. This imposes constraints on the maximum VOUT that the FAN5362 can provide, or the maximum VIN output voltage it can provide at low VOUT while maintaining a fixed switching frequency in PWM mode. (8) 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. Inductor Current Rating The switching frequency drops when the regulator cannot provide sufficient duty cycle at 3MHz to maintain regulation. This occurs when VIN is below 3.3V at nominal load currents. The FAN5362’s current limit circuit can allow a peak current of 1.25A to flow through L1 under worst-case conditions. If it is possible for the load to draw that much continuous current, the inductor should be capable of sustaining that current or failing in a safe manner. The calculation for switching frequency is given by: (4) Output Capacitor where: VOUT IOUT R OFF t SW (MAX) 35ns 1 V IN IOUT R ON VOUT I2 12 The increased RMS current produces higher losses through the RDS(ON) of the IC MOSFETs as well as the inductor ESR. When VIN is high, fixed switching is maintained as long as VOUT 1 tOFF (MIN ) fSW 0.7 . VIN 1 fSW min , 3MHz t SW (MAX ) IOUT(DC) 2 While 4.7F capacitors are available in 0402 package size, 0603 capacitors are recommended due to the severe DC voltage bias degradation in capacitance value that the 0402 exhibits. (5) where: 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, ∆VOUT, is: ROFF = RDSON _ N DCRL 1 VOUT I ESR 8 C f OUT SW RON = RDSON _ P DCRL Applications Information (9) Selecting the Inductor If values greater than 24F of COUT are used, the regulator may fail to start. See the sections on Enable and Soft Start for more information. The output inductor must meet both the required inductance and the energy handling capability of the application. Input Capacitor The 2.2F ceramic input capacitor should be placed as close as possible to 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 ringing that can occur between the inductance of the power source leads and CIN. The inductor value affects the average current limit, the PWM-to-PFM transition point, the output voltage ripple, and the efficiency. The ripple current (∆I) of the regulator is: I VOUT VIN VOUT VIN L fSW (6) The maximum average load current, IMAX(LOAD) is related to the peak current limit, ILIM(PK) by the ripple current: IMAX(LOAD ) ILIM(PK ) I 2 © 2009 Fairchild Semiconductor Corporation FAN5362 • Rev. 1.0.5 (7) www.fairchildsemi.com 10 FAN5362 — 3MHz, 500mA / 750mA Synchronous Buck Regulator The FAN5362 is optimized for operation with L=1H, but is stable with inductances up to 1.5H (nominal) and down to 470nH. The inductor should be rated to maintain at least 80% of its value at ILIM(PK). Failure to do so lowers the amount of DC current that the IC can deliver. Thermal Shutdown There are only three external components: the inductor, input capacitor, and the output capacitor. For any buck switcher IC, including the FAN5362, it is important to place a low-ESR input capacitor very close to the IC, as shown in Figure 26. The input capacitor ensures good input decoupling, which helps reduce noise appearing at the output terminals and ensures that the control sections of the 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. A1 A2 L1 0805 (2012) 0402 CAP B1 B2 C1 C2 0603 COUT Figure 26. PCB Layout Recommendation © 2009 Fairchild Semiconductor Corporation FAN5362 • Rev. 1.0.5 www.fairchildsemi.com 11 FAN5362 — 3MHz, 500mA / 750mA Synchronous Buck Regulator PCB Layout Guidelines 0.03 C F E 2X A B BALL A1 INDEX AREA 0.40 A1 D (Ø0.20) Cu Pad 0.40 F (Ø0.30) Solder Mask Opening 0.03 C 2X TOP VIEW RECOMMENDED LAND PATTERN (NSMD PAD TYPE) 0.06 C 0.625 0.547 0.05 C 0.378±0.018 0.208±0.021 E SEATING PLANE C D SIDE VIEWS Ø0.260±0.010 6X 0.40 0.005 A. NO JEDEC REGISTRATION APPLIES. C A B B. DIMENSIONS ARE IN MILLIMETERS. C B 0.40 NOTES: C. DIMENSIONS AND TOLERANCES PER ASMEY14.5M, 1994. (Y) +/-0.018 A D. DATUM C, THE SEATING PLANE IS DEFINED BY THE SPHERICAL CROWNS OF THE BALLS. F 1 2 (X) +/-0.018 E. PACKAGE TYPICAL HEIGHT IS 586 MICRONS ±39 MICRONS (547-625 MICRONS). BOTTOM VIEW F. FOR DIMENSIONS D, E, X, AND Y SEE PRODUCT DATASHEET. G. DRAWING FILENAME: UC006ACrev4. Figure 27. 6-Ball, Wafer-Level Chip-Scale Package (WLCSP), 2x3 Array, 0.4mm Pitch, 250µm Ball Product-Specific Dimensions Product D E X Y FAN5362UCX 1.310 +/-0.030 0.960 +/-0.030 0.280 0.255 Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/. © 2009 Fairchild Semiconductor Corporation FAN5362 • Rev. 1.0.5 www.fairchildsemi.com 12 FAN5362 — 3MHz, 500mA / 750mA Synchronous Buck Regulator Physical Dimensions 0.10 C 2.0 2X A B 1.60 1.50 2.0 6 4 0.50 0.10 C 2X PIN1 IDENT 1.10 1.40 TOP VIEW 1 0.55 MAX 3 0.65 0.10 C 0.08 C 2.40 0.30 (0.15) RECOMMENDED LAND PATTERN 0.05 0.00 C SEATING PLANE SIDE VIEW NOTES: PIN1 IDENT 1 1.50 MAX A. OUTLINE BASED ON JEDEC REGISTRATION MO-229, VARIATION VCCC. 3 B. DIMENSIONS ARE IN MILLIMETERS. 6x 1.10 MAX 0.35 0.25 6 4 0.65 C. DIMENSIONS AND TOLERANCES PER ASME Y14.5M, 1994. D. DRAWING FILENAME: MKT-UMLP06Crev1 0.35 6x 0.25 1.30 0.10 C A B 0.05 C BOTTOM VIEW Figure 28. 6-Lead, 2 x 2mm, Ultra-Thin Molded Leadless Package (UMLP) Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/. © 2009 Fairchild Semiconductor Corporation FAN5362 • Rev. 1.0.5 www.fairchildsemi.com 13 FAN5362 — 3MHz, 500mA / 750mA Synchronous Buck Regulator Physical Dimensions FAN5362 — 3MHz, 500mA / 750mA Synchronous Buck Regulator © 2009 Fairchild Semiconductor Corporation FAN5362 • Rev. 1.0.5 www.fairchildsemi.com 14 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 owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. 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. Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards, regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON Semiconductor data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor 19521 E. 32nd Pkwy, Aurora, Colorado 80011 USA Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada Fax: 303−675−2176 or 800−344−3867 Toll Free USA/Canada Email: [email protected] © Semiconductor Components Industries, LLC N. American Technical Support: 800−282−9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center Phone: 81−3−5817−1050 www.onsemi.com 1 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative www.onsemi.com