IR3863MTR1PBF

PD-97605 IR3863MPBF SupIRBuck TM 6A HIGHLY INTEGRATED WIDE-INPUT VOLTAGE, SYNCHRONOUS BUCK REGULATOR Features Description        The IR3863 SupIRBuckTM is an easy-to-use, fully integrated and highly efficient DC/DC voltage regulator. The onboard constant on-time hysteretic controller and MOSFETs make IR3863 a space-efficient solution that delivers up to 6A of precisely controlled output voltage.          Input Voltage Range: 3V to 21V Output Voltage Range: 0.5V to 12V Continuous 6A Load Capability Constant On-Time Control Compensation Loop not Required Excellent Efficiency at Very Low Output Currents Programmable Switching Frequency and Soft Start Thermally Compensated Over Current Protection Power Good Output Precision Voltage Reference (0.5V, +/-1%) Enable Input with Voltage Monitoring Capability Pre-bias Start Up Thermal Shut Down Under/Over Voltage Fault Protection Forced Continuous Conduction Mode Option Very Small, Low Profile 4mm x 5mm QFN Package Programmable switching frequency, soft start, and thermally compensated over current protection allows for a very flexible solution suitable for many different applications and an ideal choice for battery powered applications. Additional features include pre-bias startup, very precise 0.5V reference, over/under voltage shut down, power good output, and enable input with voltage monitoring capability. Applications     Notebook and Desktop Computers Game Consoles Consumer Electronics – STB, LCD, TV, Printers General Purpose POL DC-DC Converters 8/8/2012 Rev3.2 1 IR3863MPBF ABSOLUTE MAXIMUM RATINGS (Voltages referenced to GND unless otherwise specified) • VIN, FF …………………………………………………. -0.3V to 25V • VCC, PGOOD, EN …………………………………..... -0.3V to 8.0V • BOOT …………………………………………………… -0.3V to 33V • PHASE …………………………………………………. -0.3V to 25V(DC), -5V(100ns) • BOOT to PHASE ………………………………………. -0.3V to 8V • ISET …………………………………………………….. -0.3V to 25V, 30mA • PGND to GND …………………………………………. -0.3V to +0.3V • All other pins …………………………………………… -0.3V to 3.9V • Storage Temperature Range ………………………… -65°C To 150°C • Junction Temperature Range ………………………… -40°C To 150°C • ESD Classification …………………………………….. JEDEC Class 1C • Moisture Sensitivity Level ……………………..……… JEDEC Level 2 @ 260°C (Note 2) Stresses beyond those listed under “Absolute Maximum Ratings” 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. PACKAGE INFORMATION 4mm x 5mm POWER QFN  JA  32o C / W  J - PCB  2o C / W ORDERING INFORMATION PKG DESIG PACKAGE DESCRIPTION PIN COUNT PARTS PER REEL M IR3863MTRPbF 17 4000 M IR3863MTR1PbF 17 750 8/8/2012 Rev3.2 2 IR3863MPBF Simplified Block Diagram 8/8/2012 Rev3.2 3 IR3863MPBF Pin Description NAME NUMBER FCCM 1 ISET 2 PGOOD 3 GND 4,17 I/O LEVEL 3.3V DESCRIPTION Forced Continuous Conduction Mode (CCM). Ground this pin to enable diode emulation mode or discontinuous conduction mode (DCM). Pull this pin to 3.3V to operate in CCM under all load conditions. Connecting resistor to PHASE pin sets over current trip point. 5V Power good open drain output – pull up with a resistor to 3.3V Reference Bias return and signal reference. FB 5 3.3V Inverting input to PWM comparator, OVP / PGOOD sense. SS 6 3.3V Soft start/shutdown. This pin provides user programmable softstart function. Connect an external capacitor from this pin to GND to set the startup time of the output voltage. The converter can be shutdown by pulling this pin below 0.3V. NC 7 - - 3VCBP 8 3.3V For internal LDO. Bypass with a 1.0µF capacitor to AGND. A resistor in series with the bypass capacitor may be required in single-ground plane designs. Refer to Layout Recommendations for details. NC 9 - - VCC 10 5V VCC input. Gate drive supply. A minimum of 1.0µF ceramic capacitor is required. PGND 11 Reference Power return. PHASE 12 VIN Phase node (or switching node) of MOSFET half bridge. VIN 13 VIN Input voltage for the system. BOOT 14 VIN +VCC Bootstrapped gate drive supply – connect a capacitor to PHASE. FF 15 VIN Input voltage feed forward – sets on-time with a resistor to VIN. EN 16 5V Enable pin to turn on and off the device. Use two external resistors to set the turn on threshold (see Electrical Specifications) for input voltage monitoring. 8/8/2012 Rev3.2 4 IR3863MPBF Recommended Operating Conditions Symbol Definition Min Max Unit V VIN VCC Input Voltage Supply Voltage 3 4.5 21* 5.5 VOUT Output Voltage 0.5 12 IOUT Output Current 0 6 A Fs Switching Frequency N/A 750 kHz TJ Junction Temperature -40 125 oC * PHASE pin must not exceed 25V. Electrical Specifications Unless otherwise specified, these specification apply over VIN = 12V, 4.5V