• Single stage conversion saves energy, size and cost by eliminating the need for an intermediate bus • Low profile and excellent thermal perfor mance allows back-side board mounting • Integrated solution and high switching frequency offer high power density with reduced component count 2-4A 4-6A 6-10A IR3841W 10-16A IR3840W 16-25A 25-35A High Switching Frequency and High Input Voltage *DDR Tracking † IR3853 IR3473 IR3856 IR3859 IR3475 IR3476 IR3477 Dual Output Size(mm) 1,000kHz 5x7 Difficult: IR does well Easy ≤ 35A 5x6 600kHz ≤ 25A 4x5 Easy 300kHz 3.3V 5V 12V 3.5 x 3.5 ≤ 10A ≤ 3A SupIRBuck® 25V 10 Current (A) mypower.irf.com/supirbuck SupIRBuck® Online Design Tool Simplifies Design Comprehensive online design tool featuring parametric search, schematic capture, AC, Steady State, Transient Analysis, Thermal Analysis, BOM creation, and more… 35 Design Requirements Design Configuration es ize ck ag Pa yn c. Ma rg Tra inin ck g & ing Se Ac cu rac y [V] t [A ] Iou lf B ias Me ol ntr D Re iffer mo en te tial Se ns e IR3823 IR3897* IR3891† IR3839* IR3892† IR3898* IR3838* IR3899* IR3837* IR3894* IR3895* IR3847* IR3846* Fre q. S IR3843W IR3842W 1-3A Ma xV in 1 - 21V Integrated LDO Ma x 1 - 16V 5V bias required Constant On-Time 1.5 - 21V 3 - 27V 5V bias required Co • Common series footprint enables “cut and paste” design and scalability for faster time to market um be r PWM Pa rt N • Best-in-class efficiency tho d Integrated Voltage Regulator Product Offering P Cu rog rre ram nt Pro Ove tec r tio n Pro gra m So ft S tar t Ov er Pro Vol tec tage tio n The IR Advantage IR3891 PWM Y 4+4 21 1% --- --- Latch Y --- --- 5x6mm IR3892 PWM Y 6+6 21 1% --- --- Latch Y --- --- 5x6mm IR3823 PWM Y 3 21 0.6% --- Y Latch Y --- --- 3.5x3.5mm IR3897 PWM Y 4 21 0.5% --- --- Latch Y Y --- 4x5mm IR3898 PWM Y 6 21 0.5% --- --- Latch Y Y --- 4x5mm IR3899 PWM Y 9 21 0.5% --- --- Latch Y Y --- 4x5mm IR3894 PWM Y 12 21 0.5% --- --- Latch Y Y --- 5x6mm IR3895 PWM Y 16 21 0.5% --- --- Latch Y Y --- 5x6mm IR3846 PWM Y 35 21 0.5% Y --- Latch Y Y Y 5x7mm IR3847 PWM Y 25 21 0.5% Y --- Latch Y Y Y 5x6mm IR3837 PWM Y 14 16 1% Y --- Flag Y Y --- 5x6mm IR3838 PWM Y 10 16 1% Y --- Flag Y Y --- 5x6mm IR3839 PWM Y 6 16 1% Y --- Flag Y Y --- 5x6mm IR3840W PWM --- 12 16 1% Y Y Flag --- --- --- 5x6mm IR3841W PWM --- 8 16 1% Y Y Flag --- --- --- 5x6mm IR3842W PWM --- 4 16 1% Y Y Flag --- --- --- 5x6mm IR3843W PWM --- 2 16 1% Y Y Flag --- --- --- 5x6mm IR3853 PWM --- 4 21 1% Y Y Latch Y --- --- 4x5mm IR3856 PWM --- 6 21 1% Y Y Latch Y --- --- 4x5mm IR3859 PWM --- 9 21 1% Y Y Latch Y --- --- 4x5mm IR3473 COT* --- 6 27 1% Y Y Latch --- --- --- 4x5mm IR3475 COT* --- 10 27 1% Y Y Latch --- --- --- 4x5mm IR3476 COT* --- 12 27 1% Y Y Latch --- --- --- 5x6mm IR3477 COT* --- 15 27 1% Y Y Latch --- --- --- 5x6mm * Constant On Time control offers improved light load efficiency Simulation PCB Layout and Thermal Analysis Summary • Single stage conversion saves energy, size and cost by eliminating the need for an intermediate bus • Low profile and excellent thermal perfor mance allows back-side board mounting • Integrated solution and high switching frequency offer high power density with reduced component count 2-4A 4-6A 6-10A IR3841W 10-16A IR3840W 16-25A 25-35A High Switching Frequency and High Input Voltage *DDR Tracking † IR3853 IR3473 IR3856 IR3859 IR3475 IR3476 IR3477 Dual Output Size(mm) 1,000kHz 5x7 Difficult: IR does well Easy ≤ 35A 5x6 600kHz ≤ 25A 4x5 Easy 300kHz 3.3V 5V 12V 3.5 x 3.5 ≤ 10A ≤ 3A SupIRBuck® 25V 10 Current (A) mypower.irf.com/supirbuck SupIRBuck® Online Design Tool Simplifies Design Comprehensive online design tool featuring parametric search, schematic capture, AC, Steady State, Transient Analysis, Thermal Analysis, BOM creation, and more… 35 Design Requirements Design Configuration es ize ck ag Pa yn c. Ma rg Tra inin ck g & ing Se Ac cu rac y [V] t [A ] Iou lf B ias Me ol ntr D Re iffer mo en te tial Se ns e IR3823 IR3897* IR3891† IR3839* IR3892† IR3898* IR3838* IR3899* IR3837* IR3894* IR3895* IR3847* IR3846* Fre q. S IR3843W IR3842W 1-3A Ma xV in 1 - 21V Integrated LDO Ma x 1 - 16V 5V bias required Constant On-Time 1.5 - 21V 3 - 27V 5V bias required Co • Common series footprint enables “cut and paste” design and scalability for faster time to market um be r PWM Pa rt N • Best-in-class efficiency tho d Integrated Voltage Regulator Product Offering P Cu rog rre ram nt Pro Ove tec r tio n Pro gra m So ft S tar t Ov er Pro Vol tec tage tio n The IR Advantage IR3891 PWM Y 4+4 21 1% --- --- Latch Y --- --- 5x6mm IR3892 PWM Y 6+6 21 1% --- --- Latch Y --- --- 5x6mm IR3823 PWM Y 3 21 0.6% --- Y Latch Y --- --- 3.5x3.5mm IR3897 PWM Y 4 21 0.5% --- --- Latch Y Y --- 4x5mm IR3898 PWM Y 6 21 0.5% --- --- Latch Y Y --- 4x5mm IR3899 PWM Y 9 21 0.5% --- --- Latch Y Y --- 4x5mm IR3894 PWM Y 12 21 0.5% --- --- Latch Y Y --- 5x6mm IR3895 PWM Y 16 21 0.5% --- --- Latch Y Y --- 5x6mm IR3846 PWM Y 35 21 0.5% Y --- Latch Y Y Y 5x7mm IR3847 PWM Y 25 21 0.5% Y --- Latch Y Y Y 5x6mm IR3837 PWM Y 14 16 1% Y --- Flag Y Y --- 5x6mm IR3838 PWM Y 10 16 1% Y --- Flag Y Y --- 5x6mm IR3839 PWM Y 6 16 1% Y --- Flag Y Y --- 5x6mm IR3840W PWM --- 12 16 1% Y Y Flag --- --- --- 5x6mm IR3841W PWM --- 8 16 1% Y Y Flag --- --- --- 5x6mm IR3842W PWM --- 4 16 1% Y Y Flag --- --- --- 5x6mm IR3843W PWM --- 2 16 1% Y Y Flag --- --- --- 5x6mm IR3853 PWM --- 4 21 1% Y Y Latch Y --- --- 4x5mm IR3856 PWM --- 6 21 1% Y Y Latch Y --- --- 4x5mm IR3859 PWM --- 9 21 1% Y Y Latch Y --- --- 4x5mm IR3473 COT* --- 6 27 1% Y Y Latch --- --- --- 4x5mm IR3475 COT* --- 10 27 1% Y Y Latch --- --- --- 4x5mm IR3476 COT* --- 12 27 1% Y Y Latch --- --- --- 5x6mm IR3477 COT* --- 15 27 1% Y Y Latch --- --- --- 5x6mm * Constant On Time control offers improved light load efficiency Simulation PCB Layout and Thermal Analysis Summary