IR3883MTRPBF

IR3 883 800kHz 3A EaSy SupIRBuck® Synchronous Buck Regulator Dat as heet Rev 3.1, 09/07/2021 Pow er M anag em ent & M ul ti m ar k et IR3883 SupIRBuck® Synchronous Buck Regulator Product Overview 1 Product Overview Features Description • Wide Input Voltage Range (2.5V-14V) with an external Vcc • Single Input Voltage Range (4.5V to 14V) • Continuous 3A Load Capability • 800kHz Switching Frequency • 10uA Supply Current at Shutdown • EaSy SupIRBuck® engine Stable with Ceramic Capacitors and no External Compensation • Enhanced Light Load Efficiency with Reduced Switching Frequency and Diode Emulation • Forced Continuous Conduction Mode Option • Thermally Compensated Peak Over-Current Protection with three selectable levels • Internal Soft-Start • Enable Input • Pre-bias Start Up • Thermal Shut Down The IR3883 SupIRBuck® is an easy-to-use, fully integrated and highly efficient monolithic DC/DC regulator. The on-chip PWM controller and MOSFETs make IR3883 a space-efficient solution, providing accurate power delivery. The IR3883 employs an Enhanced Stability (EaSy) engine that makes it stable with ceramic capacitors without compensation. IR3883 can operate in Forced Continuous Conduction Mode (FCCM) or can enter Diode Emulation mode during light loads to save power. With ultra-light loads, IR3883 can enter a low quiescent current mode making it ideal for Standby power supplies. It features important protection functions, such as Pre-bias startup, internal soft-start, hiccup overcurrent protection and thermal shutdown to give required system level security in the event of fault conditions. • Power Good Output Applications • Precision Reference Voltage (0.5V+/-0.6%) • Server and Computing • Small Size 3mmx3mm QFN • Storage Applications • Lead-free, Halogen-free and RoHS6 Compliant • Communications Infrastructure • General DC-DC Converters • Distributed Point of Load Power Architectures Table 1-1 Ordering Information Part Number IR3883 Package Type PQFN 3 mm x 3 mm Standard Pack Part Number Form Quantity Tape and Reel 3000 IR3883MTRPBF Figure 1-1 IR3883 Part Number Configuration Code Datasheet 2 Rev 3.1 09/07/2021 IR3883 SupIRBuck® Synchronous Buck Regulator Basic Application 2 Figure 2-1 Basic Application IR3883 Basic Application Circuit IR3883 Efficiency @ PVin =12V and FCCM 100 95 Efficiency (%) 90 5V 85 3.3V 80 2.5V 75 1.8V 70 1.2V 1.0V 65 60 0.2 0.4 0.6 0.8 Figure 2-2 Datasheet 1 1.2 1.4 1.6 1.8 Io (A) 2 2.2 2.4 2.6 2.8 3 IR3883 Performance Curves 3 Rev 3.1 09/07/2021 IR3883 SupIRBuck® Synchronous Buck Regulator Block Diagram 3 Block Diagram Vo VCC Vin GND LDO VCC Enable LDrVin BOOT INTERNAL REFERENCE OV Fault SOFT START INDUCTOR CURRENT RIPPLE EMULATOR VREF Fault PVin SS PWM COMP + + - + SET PVIN ADAPTIVE ON-TIME GENERATOR PWM + Vcc POR OV DETECTION OV OV THERMAL SHUT-DOWN PGood GATE DRIVE LOGIC HDrv SW VCC LDrVin Fault LDrv OV POR FB FB EN/ FCCM HDrVin HDrVin Fault PGND Zcross CONTROL LOGIC FCCM_EN FCCM Zero Cross DETECTION PGND LDrVin Current Limit Control POR OCSet Figure 3-1 Datasheet Simplified block diagram 4 Rev 3.1 09/07/2021 IR3883 SupIRBuck® Synchronous Buck Regulator Pinout Diagram and Pin Description 4 Pinout Diagram and Pin Description Figure 4-1 Table 4-1 Pinout Diagram: PQFN 3 mm x 3 mm (Top View) Pin Description Pin No. Name Pin Type 1 Vin S Input supply to the internal LDO. 2 Vcc S Input bias for the internal control circuitry and driver. Supplied by an internal LDO or an external Vcc voltage. A 2.2uF ceramic capacitor must be used between Vcc and the Power ground (PGND). 3 OCSet I Over Current Protection (OCP) limit set point. Three user selectable OCP limits are available by floating this pin, connecting it to Vcc or connecting it to PGnd. 4 Gnd S Signal ground for internal reference and control circuitry. 5 En/FCCM I Multifunction pin: (1) Enable pin to turn on and off the IC. (2) Enable Diode Emulation (DE) Mode operation when En/FCCM voltage is lower than FCCM stop threshold, or Forced Continuous Conduction Mode (FCCM) operation, when En/FFCM voltage is higher than FCC start threshold. 6 PGood O Power Good status output pin is open drain. Connect a pull up resistor of 50kΩ from this pin to Vcc or an external bias voltage. 7 Fb I Output voltage feedback pin. Connect this pin to the output of the regulator via a resistor divider to set the output voltage. 8 Vo I Vo sense pin. Connect this pin directly to the output of the regulator to set the on-time. 9 Boot I Supply voltage for the high-side driver. Connect this pin to the SW node of the regulator through a bootstrap capacitor. Datasheet Function 5 Rev 3.1 09/07/2021 IR3883 SupIRBuck® Synchronous Buck Regulator Pinout Diagram and Pin Description Table 4-1 Pin Description Pin No. Name Pin Type 10, 11, 12 SW O Switch node. This pin is connected to the output inductor. 13, 14 PGND S Power Ground. This pin serves as a separated ground for the MOSFET drivers and should be connected to the system’s power ground plane. 15, 16 PVin S Input supply for the power stage. Exposed Pad - Exposed pad needs to be connected to PGND with PCB layout design. Thermal via holes can be placed on the exposed pad to aid thermal dissipation. Datasheet Function 6 Rev 3.1 09/07/2021 IR3883 SupIRBuck® Synchronous Buck Regulator Specifications 5 Specifications 5.1 Absolute Maximum Ratings Stresses beyond those listed in Table 5-1 may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications are not implied. Table 5-1 Absolute Maximum Ratings Parameter Min Max Units PVin, Vin, En/FCCM to PGND -0.3 16 V 2. 3. Vcc to PGND -0.3 6 V 2. Boot to PGND -0.3 22 V (DC) 2. -0.3 24 V (AC, 10ns) 2. -0.3 16 V (DC) 2. -4.0 18 V (AC, 10ns) 2. Boot to SW -0.3 VCC + 0.3 V 1. Vo, Fb to GND -0.3 6 V (DC) 2. -0.3 6.5 V (AC, 10us) 2. OCSet, Pgood to GND -0.3 6 V 2. PGnd to Gnd -0.3 0.3 V SW to PGND Conditions Note: 1. Must not exceed 6V. 2. PGND pin and GND pin are connected together. 3. Maximum SW node voltage should not exceed the absolute maximum rating defined in Table 5-1. Table 5-2 Thermal Information Parameter Value / Units Junction-to-ambient thermal resistance θJA 40 C/W Junction to PCB thermal resistance θJ - PCB 6oC/W Junction to case top thermal resistance θJ - CTop 38oC/W o Storage Temperature Range -55oC to 150oC Junction Temperature Range -40oC to 150oC Condition 4. Note: 4. θJA is measured with components mounted on a high effective thermal conductivity test board in free air Datasheet 7 Rev 3.1 09/07/2021 IR3883 SupIRBuck® Synchronous Buck Regulator Specifications 5.2 Recommended Operating Conditions Table 5-3 Recommended Operating Conditions Symbol Parameter Min Max Units Condition PVin Input Voltage Range with External Vcc 2.5 14 V 5. 3. PVin, Vin Input Voltage Range with Internal LDO 5.5 14 V 6. 3. Vcc Supply Voltage Range 4.5 5.5 V 3. Vo Output Voltage Range 0.5 5 V Io Continuous Output Current Range 0 3 TJ Operating Junction Temperature -40 A o 125 C Note: 5. Vin is connected to Vcc to bypass the internal LDO. 6. Vin is connected to PVin. For single-rail applications with PVin=Vin=4.5V-5.5V, Vcc (the internal LDO output voltage) is in dropout mode. Please refer to the application information in the internal LDO and the Over Current Protection sections. 5.3 Electrical Characteristics Unless otherwise specified, these specifications apply over, 5.5V < Vin = PVin < 14V, 0°C < TJ < 125°C. Typical values are specified at Ta = 25°C. Table 5-4 Electrical Characteristics Symbol Parameter Test Conditions Min Typ Max Units Power Stage Rds(on)_Top Top Switch VBoot - Vsw= 5.2V, Tj =25°C - 82 106.4 mΩ Rds(on)_Bot Bottom Switch Vcc = 5.2V, Tj =25°C - 26 33.9 mΩ 200 300 mV Boot Diode Forward Voltage IBoot = 10mA Supply Current Iin(Standby) Vin Supply Current (standby) En = Low - 1.8 10 μA Iin(Static) Vin Supply Current (static) En = 2V, No Switching - 137 200 μA Iin(Dyn) Vin Supply Current (dynamic) En = High, Fs = 800kHz, Vin = 12V - 4.5 5.5 mA 0.16 0.2 0.24 mV/µs - 0.5 Soft-Start SSrate Soft-Start Ramp Rate Feedback Voltage VFB Feedback Voltage Accuracy 0°C