IR3623MPBF

Data Sheet No.PD94717 revC IR3623MPbF HIGH FREQUENCY 2-PHASE, SINGLE OR DUAL OUTPUT SYNCHRONOUS STEP DOWN CONTROLLER WITH OUTPUT TRACKING AND SEQUENCING Description Features • • • • • • • • • • • • • • • • • • • • • • • 12V Dual Synchronous Controller with 180o Out of Phase Operation Configurable to 2-Independent Outputs or Current Share Single Output Output Voltage Tracking Power up /down Sequencing Current Sharing Using Inductor’s DCR +/-1% Accurate Reference Voltage Programmable Switching Frequency up 1200kHz Programmable Over Current Protection Hiccup Current Limit Using MOSFET RDS(on) sensing Latched Overvoltage Protection Dual Programmable Soft-Starts Enable Pre-Bias Start-up Dual Power Good Outputs On Board Regulator External Frequency Synchronization Thermal Protection 32-Lead MLPQ Package Embedded Telecom Systems Distributed Point of Load Power Architectures Computing Peripheral Voltage Regulator Graphics Card General DC/DC Converters The IR3623 IC integrates a dual synchronous Buck controller, along with IP2003A it is providing a high performance and flexible solution. The IR3623 can be configured as 2-independent outputs or as current share single output. The current share configuration is ideal for high current applications. IR3623 enables output tracking and sequencing of multiple rails in either ratiometric or simultaneous fashion. The IR3623 features 180o out of phase operation which reduces the required input/output capacitance and results to few number of capacitor quantity. The switching frequency is programmable from 200kHz to 1200kHz per phase using one external resistor, in addition IR3623 also allows the switching frequency to be synchronized to an external clock signal. Other key features offered by this device include two independent programmable soft starts, two independent power good outputs, precision enable input and under voltage lockout function. The current limit is provided by sensing the lower MOSFET's on-resistance for optimum cost and performance. The output voltages are monitored through dedicated pins protect against open circuit and enhance faster response to an overvoltage event. Applications Vo1 Vo2 C6 Vo1 Vo2 5V_sns Vcc C1 VOUT3 C7 Vdd Vin Enable Seq Track1 Sync Track2 VP1 VREF VP2 Rt R2 R3 Comp1 Comp2 Vout1 R10 Ph_En1 PWM1 R4 Enable1 IP2003A PWM1 SW1 Vsns1 Fb1 Fb2 Vsns2 R5 SW1 L1 Vout1 R6 Vsns1 R7 Fb1 R7 R6 C9 PRDY1 PGnd Ratiometric Powerup Ratiometric Powerdown R11 R1 C2 C3 OCSet1 IR3623 Vsns1 Fb1 Fb2 Gnd 12V Vo1 Vin C8 Vo1 Vo2 Vsns2 OCSet2 SW2 Vdd PRDY2 Enable2 PWM2 PGnd Gnd Vo2 L2 OVP_Output PGood1,2 OVP_Output PGood1,2 SS1 / SD SS2 / SD C5 Ph_En2 PWM2 OCGnd SW2 Vout2 IP2003A R8 Vsns2 R9 Fb2 R9 R8 C10 C4 SGnd Gnd Simultaneous Powerup Simultaneous Powerdown Fig. 1: Power Up /Down Sequencing ORDERING INFORMATION PKG DESIG M M PACKAGE DESCRIPTION IR3623MPbF IR3623MTRPbF PIN PARTS PARTS COUNT PER TUBE PER REEL 32 73 ------32 -------6000 T&R ORIANTAION Fig A www.irf.com IR3623MPbF ABSOLUTE MAXIMUM RATINGS (Voltages referenced to GND) •Vcc Supply Voltage ...............................................… -0.5V to 16V •PWM1, PWM2 …………………….………….……….. -0.5V to 16V •PGood ………. ……………………………………….. -0.5V to 16V •Gnd to SGnd ………………………………………… +/- 0.3V •Storage Temperature Range .................................... -65°C To 150°C •Operating Junction Temperature Range .................. -40°C To 125°C •ESD Classification …………………………………… JEDEC, JESD22-A114 Caution: Stresses above those listed in “Absolute Maximum Rating” may cause permanent damage to the device. These are stress ratings only and function of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to “Absolute Maximum Rating” conditions for extended periods may affect device reliability. Package Information 5V _sn s En ab le Rt Gn d SG nd VR EF 2 32 PGood1 1 PGood2 2 Track2 3 VSEN2 4 OVP_Output 5 31 30 29 28 27 VP 26 25 24 Seq 23 Sync 22 Track1 VP 1 Pad 21 VSEN1 20 19 OCGnd Fb1 Fb2 6 Comp2 7 SS2/SD2/Mode 8 9 10 11 12 C 18 Comp1 17 SS1/SD1 13 UT 3 14 15 16 OC Se t2 Ph _E n2 PW M2 VC ΘJA = 36o C/W ΘJC = 1o C/W *Exposed pad on underside is connected to a copper pad through vias for 4-layer PCB board design www.irf.com PW M1 Ph _E n1 OC Se t1 VO 2 IR3623MPbF Recommended Operating Conditions Symbol Vcc Fs Tj Definition Supply Voltage Operating frequency Junction temperature Min 8.5 200 -40 Max 14.5 1200 125 Units V kHz o C Electrical Specifications Unless otherwise specified, these specification apply over Vcc=12V, 0oC 1 - - - -(21) By replacing Zin and Zf according to figure 15, the transformer function can be expressed as: (1 + sR7C11 ) * [1 + sC10 (R6 + R8 )] 1 * H (s ) = sR6 (C11 + C12 ) ⎡ ⎛ C11 * C12 ⎞⎤ ⎢1 + sR7 ⎜ ⎜ C + C ⎟⎥ * (1 + sR8C10 ) ⎟ ⎝ 11 12 ⎠ ⎦ ⎣ www.irf.com Cross over frequency is expressed as: Fo = R7 * C10 * Vin 1 * Vosc 2π * Lo * Co 20 IR3623MPbF Based on the frequency of the zero generated by output capacitor and its ESR versus crossover frequency, the compensation type can be different. The table below shows the compensation types and location of crossover frequency. Compensator type TypII(PI) FESR vs. Fo Output capacitor Electrolytic , Tantalum Tantalum, ceramic Ceramic FLC