FAN2365AMPX

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 Fairchild_questions@onsemi.com. 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. FAN2365AMPX 15 A Synchronous Buck Regulator Features Description               The FAN2365A is a highly efficient synchronous buck regulator. The regulator is capable of operating with an input range from 4.5 V to 24 V and supporting up to 15 A continuous load currents. VIN Range: 4.5 V to 24 V High Efficiency: Over to 96% Peak Continuous Output Current: 15 A PFM Mode for Light-Load Efficiency Excellent Line and Load Transient Response Precision Reference: ±1% Over-Temperature Output Voltage Range: 0.6 to 5.5 V Programmable Frequency: 200 kHz to 1 MHz Programmable Soft-Start Low Shutdown Current Adjustable Sourcing Current Limit Internal Boot Diode Thermal Shutdown Halogen and Lead Free, RoHS Compliant The FAN2365A utilizes Fairchild’s constant on-time control architecture to provide excellent transient response and to maintain a relatively constant switching frequency. This device utilizes Pulse Frequency Modulation (PFM) mode to maximize light-load efficiency by reducing switching frequency when the inductor is operating in discontinuous conduction mode at light loads, while clamping the minimum frequency above the audible range with ultrasonic mode. Switching frequency and over-current protection can be programmed to provide a flexible solution for various applications. Output over-voltage, undervoltage, over-current, and thermal shutdown protections help prevent damage to the device during fault conditions. After thermal shutdown is activated, a hysteresis feature restarts the device when normal operating temperature is reached. Applications       Mainstream Notebooks Servers and Desktop Computers Game Consoles Telecommunications Storage Base Stations Ordering Information Part Number Configuration Operating Temperature Range Output Current (A) FAN2365AMPX PFM with Ultrasonic Mode -40 to 125°C 15 © 2015 Fairchild Semiconductor Corporation FAN2365AMPX • Rev. 1.0 Package 34-Lead, PQFN, 5.5 mm x 5.0 mm www.fairchildsemi.com FAN2365AMPX — 6 A Synchronous Buck Regulator September 2015 VBIAS = 5V R11 10Ω C9 0.1µF C10 2.2µF PVCC VCC Ext EN VIN = 12V CIN 0.1µF VIN CIN 2x10µF PVIN C3 0.1µF EN VOUT = 1.2V IOUT=0-6A BOOT L1 1.2µH FAN2365A SW PGOOD ILIM SOFT START R5 1.5kΩ C7 15nF R2 1.5kΩ C4 0.1µF R3 10kΩ C5 100pF FREQ COUT 4x47µF FB R9 54.9kΩ AGND R6 4.99kΩ PGND Figure 1. R4 10kΩ Typical Application Functional Block Diagram VIN BOOT PVIN FAN2365AMPX — 15 A Synchronous Buck Regulator Typical Application Diagram PVCC PVCC VCC VCC VCC UVLO 0.8V/ 2.0V PVCC EN ENABLE VCC VCC 10µA Modulator HS Gate Driver SS FB FB Comparator VREF SW FREQ Control Logic x1.2 2nd Level Over Voltage Comparator x1.1 1st Level Over Voltage Comparator x0.9 Under Voltage Comparator PFM Comparator PVCC LS Gate Driver VCC PGOOD Thermal Shutdown 10µA Current Limit Comparator AGND ILIM Figure 2. © 2015 Fairchild Semiconductor Corporation FAN2365AMPX • Rev. 1.0 PGND Block Diagram www.fairchildsemi.com 2 9 VIN PVIN 9 SW PVIN 8 BOOT PVIN 7 AGND PVIN 6 PVIN PVIN 5 PVIN AGND 4 PVIN BOOT 3 PVIN SW 2 PVIN VIN 1 8 7 6 5 4 3 2 1 10 PVIN PVIN 10 34 NC 11 PVIN PVIN 11 33 NC 12 SW SW 12 32 FREQ 13 SW SW 13 31 SS 14 SW SW 30 PGOOD 29 15 SW SW 15 29 EN NC 28 16 SW SW 16 28 NC FB 27 17 SW SW 17 27 FB 24 23 22 21 20 PVCC ILIM AGND SW PGND PGND 19 18 Figure 3. Pin Assignments, Bottom View 18 19 20 21 22 23 24 25 26 VCC 26 25 VCC EN 14 PVCC SW (P3) PGOOD 30 ILIM AGND (P1) AGND 31 SW SS PGND 32 PGND FREQ PGND 33 PGND NC PVIN (P2) PGND 34 PGND NC Figure 4. Pin Assignments, Top View Pin Definitions Name Pad / Pin PVIN P2, 5-11 Description Power input for the power stage. VIN 1 Input to the modulator for input voltage feed-forward. PVCC 25 Power supply input for the low-side gate driver and boot diode. VCC 26 Power supply input for the controller. PGND 18-21 AGND P1, 4, 23 SW Power ground for the low-side power MOSFET and for the low-side gate driver. Analog ground for the analog portions of the IC and substrate. P3, 2, 12-17, 22 Switching node; junction between high-and low-side MOSFETs. BOOT 3 Supply for high-side MOSFET gate driver. A capacitor from BOOT to SW supplies the charge to turn on the N-channel high-side MOSFET. During the freewheeling interval (low-side MOSFET on), the high-side capacitor is recharged by an internal diode connected to PVCC. ILIM 24 Current limit. A resistor between ILIM and SW sets the current limit threshold. FB 27 Output voltage feedback to the modulator. EN 29 Enable input to the IC. Pin must be driven logic high to enable, or logic low to disable. SS 31 Soft-start input to the modulator. FREQ 32 On-time and frequency programming pin. Connect a resistor between FREQ and AGND to program on-time and switching frequency. PGOOD 30 Power good; open-drain output indicating VOUT is within set limits. NC 28, 33-34 Leave pin open or connect to AGND. © 2015 Fairchild Semiconductor Corporation FAN2365AMPX • Rev. 1.0 www.fairchildsemi.com 3 FAN2365AMPX — 15 A Synchronous Buck Regulator Pin Configuration 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 VPVIN VIN VBOOT VSW VBOOT Parameter Conditions Min. Max. Unit Power Input Referenced to PGND -0.3 30.0 V Modulator Input Referenced to AGND -0.3 30.0 V Referenced to PVCC -0.3 30.0 V Referenced to PVCC,