FAN2306MMPX

FAN2306 / FAN2306M TinyBuck™ 6 A Integrated Synchronous Buck Regulator Features Description     VIN Range: 4.5 V to 18 V The FAN2306 / FAN2306M are highly efficient integrated TinyBuck™ synchronous buck regulators. They are capable of operating with an input range from 4.5 V to 18 V, supporting 6 A continuous load currents.             PFM Mode for Light-Load Efficiency High Efficiency: Over 96% Peak Continuous Output Current: 6 A MOSFETs RDS,ON (Typical): HS: 9.67 mΩ, LS: 5.46 mΩ Ultrasonic or No-Ultrasonic Mode Options 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 1.5 MHz Programmable Soft-Start Low Shutdown Current Adjustable Sourcing Current Limit Internal Boot Diode Thermal Shutdown Halogen and Lead Free, RoHS Compliant These devices utilize Fairchild’s constant on-time control architecture to provide excellent transient response and to maintain a relatively constant switching frequency. The FAN2306 / FAN2306M utilize Pulse Frequency Modulation (PFM) mode to maximize lightload efficiency by reducing switching frequency when the inductor is operating in Discontinuous Conduction Mode (DCM) at light loads. The FAN2306 includes an ultrasonic mode with minimum frequency clamp to keep the switching frequency above the audible range, while the FAN2306M does not include the minimum frequency clamp to maximize efficiency to extremely light loads. 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       Servers and Desktop Computers NVDC Notebooks, Netbooks Game Consoles Telecommunications Storage Base Stations Ordering Information Part Number Configuration Operating Temperature Range Output Current (A) FAN2306MPX PFM with Ultrasonic Mode -40 to 125°C 6 FAN2306MMPX PFM, No Ultrasonic Mode -40 to 125°C 6 Package 34-Lead, PQFN, 5.5 mm x 5.0 mm Forced PWM available on request. Please send requests and questions to “tinybucksupport@fairchildsemi.com.” All trademarks are the property of their respective owners. © 2011 Fairchild Semiconductor Corporation FAN2306 / FAN2306M • Rev. 1.13 www.fairchildsemi.com FAN2306 / FAN2306M — TinyBuck™ 6 A Integrated Synchronous Buck Regulator December 2014 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 FAN2306 FAN2306M SW PGOOD ILIM SOFT START R2 1.5kΩ R5 1.5kΩ C7 15nF C4 0.1µF C5 100pF FREQ R3 10kΩ FB R9 54.9kΩ AGND R4 10kΩ PGND Figure 1. Typical Application Functional Block Diagram VIN BOOT PVIN PVCC PVCC VCC VCC VCC UVLO 0.8V/ 2.0V PVCC EN ENABLE VCC VCC 10µA Modulator COUT 4x47µF FAN2306 / FAN2306M — TinyBuck™ 6 A Integrated Synchronous Buck Regulator Typical Application Diagram 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 PGND Figure 2. Block Diagram © 2011 Fairchild Semiconductor Corporation FAN2306 / FAN2306M • Rev. 1.13 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 25 24 23 22 21 20 ILIM AGND SW PGND PGND 19 14 18 Figure 3. Pin Assignments, Bottom View 18 19 20 21 22 23 24 25 26 VCC 26 PVCC EN VCC PGOOD 30 PVCC SW (P3) 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 input for the low-side gate driver and boot diode VCC 26 Power supply input for the controller PGND 18-21 AGND SW P1, 4, 23 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 for 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. © 2011 Fairchild Semiconductor Corporation FAN2306 / FAN2306M • Rev. 1.13 www.fairchildsemi.com 3 FAN2306 / FAN2306M — TinyBuck™ 6 A Integrated 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 Parameter Conditions Min. Max. Unit Power Input Referenced to PGND -0.3 25.0 V Modulator Input Referenced to AGND -0.3 25.0 V Referenced to PVCC -0.3 26.0 V Referenced to PVCC,