LTC3855 Dual, Multiphase Synchronous DC/DC Controller with Differential Remote Sense Features n n n n n n n n n n n n n n n n Description Dual, 180° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise High Efficiency: Up to 95% RSENSE or DCR Current Sensing Programmable DCR Temperature Compensation ±0.75% 0.
LTC3855 Absolute Maximum Ratings (Note 1) Input Supply Voltage (VIN).......................... –0.3V to 40V Top Side Driver Voltages BOOST1, BOOST2................................... –0.3V to 46V Switch Voltage (SW1, SW2).......................... –5V to 40V INTVCC , RUN1, RUN2, PGOOD(s), EXTVCC, (BOOST1-SW1), (BOOST2-SW2).............. –0.3V to 6V SENSE1+, SENSE2+, SENSE1–, SENSE2– Voltages.................................. –0.
LTC3855 Order information LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3855EFE#PBF LTC3855EFE#TRPBF LTC3855FE 38-Lead Plastic TSSOP –40°C to 85°C LTC3855IFE#PBF LTC3855IFE#TRPBF LTC3855FE 38-Lead Plastic TSSOP –40°C to 125°C 40-Lead (6mm × 6mm) Plastic QFN –40°C to 85°C 40-Lead (6mm × 6mm) Plastic QFN –40°C to 125°C LTC3855EUJ#PBF LTC3855EUJ#TRPBF LTC3855UJ LTC3855IUJ#PBF LTC3855IUJ#TRPBF LTC3855UJ Consult LTC Marketing for parts specified wi
LTC3855 Electrical Characteristics The l denotes the specifications which apply over the full operating junction temperature range (E-Grade), otherwise specifications are at TA = 25°C. VIN = 15V, VRUN1,2 = 5V unless otherwise noted.
LTC3855 Electrical Characteristics The l denotes the specifications which apply over the full operating junction temperature range (E-Grade), otherwise specifications are at TA = 25°C. VIN = 15V, VRUN/SS = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS On Chip Driver TG RUP TG Pull-Up RDS(ON) TG High 2.6 Ω TG RDOWN TG Pull-Down RDS(ON) TG Low 1.5 Ω BG RUP BG Pull-Up RDS(ON) BG High 2.4 Ω BG RDOWN BG Pull-Down RDS(ON) BG Low 1.
LTC3855 Typical Performance Characteristics Load Step (Burst Mode Operation) Load Step (Forced Continuous Mode) ILOAD 5A/DIV 300mA TO 5A ILOAD 5A/DIV 300mA TO 5A IL 5A/DIV IL 5A/DIV VOUT 100mV/DIV AC-COUPLED VOUT 100mV/DIV AC-COUPLED VIN = 12V VOUT = 1.8V 50µs/DIV 3855 G01 VIN = 12V VOUT = 1.
LTC3855 Typical Performance Characteristics Tracking Up and Down with External Ramp 4.5 TK/SS1 TK/SS2 2V/DIV Quiescent Current vs Temperature without EXTVCC 5.5 4.0 VOUT2 VOUT1 VOUT2 500mA/DIV 3855 G07 10ms/DIV VIN = 12V VOUT1 = 1.8V, 1.5Ω LOAD VOUT2 = 1.2V, 1Ω LOAD 5.0 3.5 INTVCC VOLTAGE (V) QUIESCENT CURRENT (mA) VOUT1 INTVCC Line Regulation 3.0 2.5 2.0 1.5 1.0 4.5 4.0 3.5 3.0 2.5 0.5 0 –50 –25 0 50 25 75 TEMPERATURE (°C) 100 2.
LTC3855 Typical Performance Characteristics Regulated Feedback Voltage vs Temperature Oscillator Frequency vs Temperature 1.26 612 900 1.24 610 800 608 700 ON 1.20 1.18 1.16 1.14 OFF 1.12 1.10 –50 –25 50 25 75 0 TEMPERATURE (°C) 100 606 FREQUENCY (kHz) 1.22 REGULATED FEEDBACK VOLTAGE (mV) RUN PIN THRESHOLD (V) Shutdown (RUN) Threshold vs Temperature 604 602 600 598 100 50 25 75 0 TEMPERATURE (°C) 100 SHUTDOWN INPUT CURRENT (µA) 500 490 2.9 2.7 2.
LTC3855 Pin Functions (FE38/UJ40) ITEMP1, ITEMP2 (Pin 2, Pin 1/Pin 37, Pin 36): Inputs of the temperature sensing comparators. Connect each of these pins to external NTC resistors placed near inductors. Floating these pins disables the DCR temperature compensation function. RUN1, RUN2 (Pin 3, Pin 17/Pin 38, Pin 13): Run Control Inputs. A voltage above 1.2V on either pin turns on the IC. However, forcing either of these pins below 1.
LTC3855 Pin Functions (FE38/UJ40) BOOST1, BOOST2 (Pin 32, Pin 24/Pin 29, Pin 21): Boosted Floating Driver Supplies. The (+) terminal of the bootstrap capacitors connect to these pins. These pins swing from a diode voltage drop below INTVCC up to VIN + INTVCC. TG1, TG2 (Pin 33, Pin 23/Pin 30, Pin 20): Top Gate Driver Outputs. These are the outputs of floating drivers with a voltage swing equal to INTVCC superimposed on the switch nodes voltages.
LTC3855 Functional Block Diagram FREQ MODE/PLLIN PHASMD ITEMP EXTVCC VIN VIN 4.7V F 0.6V MODE/SYNC DETECT PLL-SYNC + – TEMPSNS + 5V REG + – CIN INTVCC INTVCC F BOOST CLKOUT OSC BURSTEN S R 3k + ON – ICMP + – IREV CB TG FCNT Q M1 SW SWITCH LOGIC AND ANTISHOOT THROUGH L1 SENSE+ VOUT DB SENSE– + RUN BG OV M2 CVCC SLOPE COMPENSATION ILIM COUT PGND PGOOD INTVCC + 1 51k ITHB UV – 0.
LTC3855 Operation Main Control Loop The LTC3855 is a constant-frequency, current mode stepdown controller with two channels operating 180 degrees out-of-phase. During normal operation, each top MOSFET is turned on when the clock for that channel sets the RS latch, and turned off when the main current comparator, ICMP, resets the RS latch. The peak inductor current at which ICMP resets the RS latch is controlled by the voltage on the ITH pin, which is the output of each error amplifier EA.
LTC3855 Operation voltage below 0.6V (e.g., SGND). To select pulse-skipping mode of operation, tie the MODE/PLLIN pin to INTVCC. To select Burst Mode operation, float the MODE/PLLIN pin. When a controller is enabled for Burst Mode operation, the peak current in the inductor is set to approximately one-third of the maximum sense voltage even though the voltage on the ITH pin indicates a lower value.
LTC3855 Operation Sensing the Output Voltage with a Differential Amplifier The LTC3855 includes a low offset, unity gain, high bandwidth differential amplifier for applications that require true remote sensing. Sensing the load across the load capacitors directly greatly benefits regulation in high current, low voltage applications, where board interconnection losses can be a significant portion of the total error budget. The LTC3855 differential amplifier has a typical output slew rate of 2V/μs.
LTC3855 Operation frequency of the LTC3855’s controllers can be selected using the FREQ pin. If the MODE/PLLIN pin is not being driven by an external clock source, the FREQ pin can be used to program the controller’s operating frequency from 250kHz to 770kHz. There is a precision 10µA current flowing out of the FREQ pin, so the user can program the controller’s switching frequency with a single resistor to SGND.
LTC3855 Applications Information less than 1µA. When the SENSE pins ramp up from 0V to 1.4V, the small base currents flow out of the SENSE pins. When the SENSE pins ramp down from 12.5V to 1.1V, the small base currents flow into the SENSE pins. The high impedance inputs to the current comparators allow accurate DCR sensing. However, care must be taken not to float these pins during normal operation.
LTC3855 Applications Information VIN INTVCC BOOST TG LTC3855 BG PGND SENSE– SGND VIN INTVCC SENSE RESISTOR PLUS PARASITIC INDUCTANCE BOOST RS SW SENSE+ VIN RF ESL BG PGND R1** SENSE+ RP C1* SGND RF VOUT DCR LTC3855 RS RNTC CF L SW ITEMP CF • 2RF ≤ ESL/RS POLE-ZERO CANCELLATION INDUCTOR TG OPTIONAL TEMP COMP NETWORK VOUT VIN R2 SENSE– 3855 F02a L R2 R = DCR **PLACE R1 NEXT TO *PLACE C1 NEAR SENSE+, R1||R2 × C1 = DCR SENSE(EQ) R1 + R2 INDUCTOR SENSE– PINS FILTER COMPONENTS PL
LTC3855 Applications Information always the same and varies with temperature; consult the manufacturers’ datasheets for detailed information.
LTC3855 Applications Information RITEMP100C = VITEMP100C 10µA VITEMP100C = 0.5V − 1.3 • After determining the components for the temperature compensation network, check the results by plotting IMAX versus inductor temperature using the following equations: IMAX = IMAX • DCR(MAX) • R2 (1100°C − 25°C) • 0.4 • R1+ R2 100 VSENSE(MAX ) Calculate the values for RP and RS. A simple method is to graph the following RS versus RP equations with RS on the y-axis and RP on the x-axis.
LTC3855 Applications Information 10000 25 THERMISTOR RESISTANCE RO = 100k, TO = 25°C B = 4334 for 25°C/100°C 20 CORRECTED IMAX IMAX (A) RESISTANCE (kΩ) 1000 100 RITMP RS = 20kΩ RP = 43.2kΩ 100k NTC 10 1 –40 –20 0 20 40 60 80 100 120 INDUCTOR TEMPERATURE (°C) 15 NOMINAL IMAX UNCORRECTED IMAX RS = 20kΩ RP = 43.2kΩ 5 NTC THERMISTOR: RO = 100k TO = 25°C B = 4334 0 20 40 60 80 100 120 –40 –20 0 INDUCTOR TEMPERATURE (°C) 10 3855 F05 3855 F06 Figure 5.
LTC3855 Applications Information A reasonable starting point is to choose a ripple current that is about 40% of IOUT(MAX) for a duty cycle less than 40%. Note that the largest ripple current occurs at the highest input voltage.
LTC3855 Applications Information The MOSFET power dissipations at maximum output current are given by: VOUT 2 IMAX ) (1+ d) RDS(ON) + ( VIN 2 I ( VIN ) MAX (RDR )(CMILLER ) • 2 1 1 • fOSC + VINTVCC – VTH(MIN) VTH(MIN) PMAIN = PSYNC = VIN – VOUT 2 IMAX ) (1+ d) RDS(ON) ( VIN where d is the temperature dependency of RDS(ON) and RDR (approximately 2Ω) is the effective driver resistance at the MOSFET’s Miller threshold voltage.
LTC3855 Applications Information producing a small offset error. To minimize this error, select the tracking resistive divider value to be small enough to make this error negligible. In order to track down another channel or supply after the soft-start phase expires, the LTC3855 is forced into continuous mode of operation as soon as VFB is below the undervoltage threshold of 0.54V regardless of the setting on the MODE/PLLIN pin.
LTC3855 Applications Information INTVCC Regulators and EXTVCC The LTC3855 features a true PMOS LDO that supplies power to INTVCC from the VIN supply. INTVCC powers the gate drivers and much of the LTC3855’s internal circuitry. The linear regulator regulates the voltage at the INTVCC pin to 5V when VIN is greater than 5.5V. EXTVCC connects to INTVCC through a P-channel MOSFET and can supply the needed power when its voltage is higher than 4.7V.
LTC3855 Applications Information due to the dropout voltage. Make sure the INTVCC voltage is at or exceeds the RDS(ON) test voltage for the MOSFET which is typically 4.5V for logic level devices. LTC3855 VIN RVIN INTVCC CINTVCC 4.7µF 1Ω 5V + CIN 3855 F07 Figure 10. Setup for a 5V Input Topside MOSFET Driver Supply (CB, DB) External bootstrap capacitors CB connected to the BOOST pins supply the gate drive voltages for the topside MOSFETs.
LTC3855 Applications Information can also be used for CIN. Always consult the manufacturer if there is any question. The benefit of the LTC3855 2-phase operation can be calculated by using the equation above for the higher power controller and then calculating the loss that would have resulted if both controller channels switched on at the same time. The total RMS power lost is lower when both controllers are operating due to the reduced overlap of current pulses required through the input capacitor’s ESR.
LTC3855 Applications Information Phase-Locked Loop and Frequency Synchronization 900 The LTC3855 has a phase-locked loop (PLL) comprised of an internal voltage-controlled oscillator (VCO) and a phase detector. This allows the turn-on of the top MOSFET of controller 1 to be locked to the rising edge of an external clock signal applied to the MODE/PLLIN pin. The turn-on of controller 2’s top MOSFET is thus 180 degrees outof-phase with the external clock.
LTC3855 Applications Information If the duty cycle falls below what can be accommodated by the minimum on-time, the controller will begin to skip cycles. The output voltage will continue to be regulated, but the ripple voltage and current will increase. The minimum on-time for the LTC3855 is approximately 90ns, with reasonably good PCB layout, minimum 30% inductor current ripple and at least 10mV – 15mV ripple on the current sense signal.
LTC3855 Applications Information losses can be minimized by making sure that CIN has adequate charge storage and very low ESR at the switching frequency. A 25W supply will typically require a minimum of 20µF to 40µF of capacitance having a maximum of 20mΩ to 50mΩ of ESR. The LTC3855 2-phase architecture typically halves this input capacitance requirement over competing solutions.
LTC3855 Applications Information PC Board Layout Checklist When laying out the printed circuit board, the following checklist should be used to ensure proper operation of the IC. These items are also illustrated graphically in the layout diagram of Figure 14. Figure 15 illustrates the current waveforms present in the various branches of the 2-phase synchronous regulators operating in the continuous mode. Check the following in your layout: 1.
LTC3855 Applications Information CLKOUT ITH1 LTC3855 RPU2 PGOOD PGOOD VPULL-UP DIFFP DIFFN L1 DIFFOUT SENSE1+ SENSE1– CB1 BG1 MODE/PLLIN COUT1 PGND VIN INTVCC SENSE2+ BG2 M3 BOOST2 GND COUT2 1µF CERAMIC + SENSE2– CIN CINTVCC + EXTVCC TK/SS2 RIN CVIN D1 + VIN SGND ITH2 M2 1µF CERAMIC RUN1 VFB2 M1 BOOST1 ILIM RUN2 VOUT1 SW1 FREQ fIN RSENSE TG1 + VFB1 TK/SS1 M4 D2 CB2 SW2 RSENSE TG2 VOUT2 L2 3855 F14 Figure 14.
LTC3855 Applications Information This occurs around 50% duty cycle on either channel due to the phasing of the internal clocks and may cause minor duty cycle jitter. Reduce VIN from its nominal level to verify operation of the regulator in dropout. Check the operation of the undervoltage lockout circuit by further lowering VIN while monitoring the outputs to verify operation. Investigate whether any problems exist only at higher output currents or only at higher input voltages.
LTC3855 Applications Information 4.7µF M1 D3 0.1µF L1 0.56µH M2 BG1 LTC3855 MODE/PLLIN ILIM1 SENSE1– RUN2 40.2k 1% + RUN1 1nF COUT1 330µF s2 20k 1% 12.1k 1% TK/SS1 L2 0.56µH BOOST2 SW2 M4 BG2 CLKOUT PGND 3.09k 1% 0.1µF 20k, 1% DIFFOUT VFB2 ITH2 VFB1 ITH1 150pF M3 0.1µF SENSE2– ITEMP2 DIFFP DIFFN ITEMP1 VOUT1 1.8V 15A 82µF 25V FREQ ILIM2 SENSE2+ SENSE1+ 0.1µF VIN 4.5V TO 20V D4 VIN PGOOD EXTVCC INTVCC TG1 TG2 BOOST1 SW1 3.09k 1% 10µF 25V s2 1µF 2.2Ω + SGND 0.
LTC3855 Applications Information MOSFET results in: RDS(ON) = 13mΩ (max), VMILLER = 2.6V, CMILLER ≅ 150pF. At maximum input voltage with TJ (estimated) = 75°C: A Renesas RJK0330DPB, RDS(ON) = 3.9mΩ, is chosen for the bottom FET. The resulting power loss is: 20V – 1.8V 2 15A ) • ( 20V 1+ ( 0.005) • ( 75°C – 25°C) • 0.0039Ω PSYNC = 1.8V 2 PMAIN = 15A ) [1+ (0.005)(75°C – 25°C)] • ( 20V (0.013Ω) + (20V )2 15A (2Ω)(150pF ) • 2 PSYNC = 1W 1 1 5V – 2.6V + 2.
LTC3855 Typical Applications 100Ω 100Ω 1nF 100k ITH1 BOOST1 VFB1 PGND1 SGND 150pF 20k VFB2 PGOOD1 PGOOD2 + M2 RJK0330DPB COUT2 330µF 2.5V s2 VOUT1 1.8V 15A 4.7µF 0.1µF SW2 BOOST2 NC PGOOD2 20k PGOOD1 100Ω ILIM2 PGND2 ILIM1 SENSE2– DIFFN 100Ω EXTVCC BG2 DIFFP 0.1µF COUT1 100µF 6.3V INTVCC SENSE2+ RUN2 1nF 2.2Ω VIN 4.5V TO 20V 82µF 25V s2 0.002Ω L1 0.4µH CMDSH-3 VIN LTC3855 ITH2 DIFFOUT 1.5nF 0.1µF BG1 TK/SS2 5.
LTC3855 Typical Applications 100Ω BOOST1 VFB1 PGND1 100Ω PGOOD 100k TG2 SW2 RUN 100Ω 2.2Ω M2 RJK0330DPB s2 4.7µF COUT1 100µF 6.3V s4 0.1µF + COUT2 330µF 2.5V s4 VOUT 1.2V 40A BOOST2 NC PGOOD2 DIFFN DIFFP PGOOD1 PGND2 ILIM2 BG2 SENSE2– ILIM1 SENSE2+ RUN2 1nF EXTVCC DIFFOUT 5.9k 0.001Ω 1% INTVCC TK/SS2 100pF VIN 4.5V TO 14V 270µF 16V L1 0.44µH CMDSH-3 VIN LTC3855 ITH2 20k 0.
LTC3855 Typical Applications 0.1µF + TG1 ITH1 BOOST1 VFB1 PGND1 SGND 2.2Ω M2 RJK0330DPB s2 4.7µF 1µF COUT1 100µF 6.3V s4 TG2 SW2 0.1µF COUT2 330µF 2.5V s4 VOUT 1.2V 40A CMDSH-3 M3 RJK0305DPB PGOOD + BOOST2 NC PGOOD2 DIFFN DIFFP PGOOD1 PGND2 ILIM2 BG2 SENSE2– ILIM1 SENSE2+ RUN2 0.1µF EXTVCC DIFFOUT 10k 3.92k INTVCC TK/SS2 330pF 20k VIN 4.5V TO 14V 270µF 16V L1 0.47µH CMDSH-3 VIN LTC3855 ITH2 3300pF 0.
LTC3855 Typical Applications 100Ω 100Ω 1nF 400kHz TG1 ITH1 BOOST1 VFB1 PGND1 SGND 100Ω 100Ω PGOOD 2.2Ω M2 RJK0330DPB s2 4.7µF 1µF COUT1 100µF 6.3V s2 + COUT2 330µF 2.5V s4 VOUT 0.9V 50A 100k TG2 SW2 BOOST2 NC PGOOD2 DIFFN DIFFP PGOOD1 PGND2 ILIM2 BG2 SENSE2– ILIM1 SENSE2+ RUN2 1nF EXTVCC DIFFOUT 5.1k 0.001Ω 1% INTVCC TK/SS2 220pF 20k VIN 4.5V TO 14V 270µF 16V L1 0.23µH CMDSH-3 VIN LTC3855 ITH2 2700pF 0.
LTC3855 Typical Applications 100Ω 13.3k VFB1 PGND1 SGND BG1 VFB2 VIN LTC3855 SENSE2– CMDSH-3 2.2Ω 4.7µF 1µF SW2 0.1µF M3 RJK0305DPB L2 0.3µH CMDSH-3 PGOOD1V 100k BOOST1 VFB1 PGND1 EXTVCC SENSE2+ SENSE2– 4.7µF 1µF 10µF TG2 SW2 BOOST2 NC PGOOD2 PGOOD1 ILIM2 PGND2 ILIM1 DIFFN DIFFP RUN2 0.1µF M6 RJK0330DPB BG2 DIFFOUT 10k 2.2Ω INTVCC TK/SS2 100pF L3 0.3µH CMDSH-3 VIN LTC3855 ITH2 0.1µF VOUT1 1V 50A 0.002Ω 1% 0.1µF BG1 VFB2 3300pF COUT2 470µF 2.
LTC3855 Typical Applications VIN 7V TO 24V 22µF 50V 2.2Ω 1µF Si4816BDY 4.7µF D3 M1 0.1µF L2 2.2µH TG1 BOOST1 SW1 BG1 10Ω 10Ω 15pF + 90.9k 1% COUT1 220µF MODE/PLLIN ILIM SENSE1+ M2 0.1µF 20k 1% 1000pF 100pF 10k 1% L2 3.3µH BOOST2 SW2 BG2 CLKOUT PGND FREQ SENSE2+ 10Ω 1000pF 8mΩ VOUT1 3.3V 5A TG2 LTC3855 Si4816BDY D4 VIN PGOOD INTVCC 1000pF SENSE1– SENSE2– RUN1 DIFFP RUN2 DIFFN EXTVCC DIFFOUT VFB2 VFB1 ITH2 ITH1 TK/SS1 SGND TK/SS2 0.1µF 0.
LTC3855 Typical Applications 0.1µF 383k ITH1 BOOST1 VFB1 PGND1 SGND 47pF 20k VFB2 INTVCC EXTVCC SENSE2+ 0.1µF + M2 BSC093N040LS COUT1 39µF 16V s2 VOUT1 12V 6A 4.7µF 0.1µF SW2 BOOST2 NC PGOOD2 PGOOD1 ILIM2 ILIM1 147k RUN2 0.1µF VIN 13V TO 38V PGND2 DIFFOUT DIFFP 100µF 50V 18k L1 13µH 2.2Ω BG2 SENSE2– 24k + CMDSH-3 VIN LTC3855 ITH2 DIFFN 5.6nF 0.1µF BG1 TK/SS2 4.
LTC3855 Package Description FE Package 38-Lead Plastic TSSOP (4.4mm) (Reference LTC DWG # 05-08-1772 Rev A) Exposed Pad Variation AA 4.75 REF 38 9.60 – 9.80* (.378 – .386) 4.75 REF (.187) 20 6.60 ±0.10 4.50 REF 2.74 REF SEE NOTE 4 6.40 2.74 REF (.252) (.108) BSC 0.315 ±0.05 1.05 ±0.10 0.50 BSC RECOMMENDED SOLDER PAD LAYOUT 4.30 – 4.50* (.169 – .177) 0.09 – 0.20 (.0035 – .0079) 0.50 – 0.75 (.020 – .030) NOTE: 1. CONTROLLING DIMENSION: MILLIMETERS 2. DIMENSIONS ARE IN MILLIMETERS (INCHES) 3.
LTC3855 Package Description UJ Package 40-Lead Plastic QFN (6mm × 6mm) (Reference LTC DWG # 05-08-1728 Rev Ø) 0.70 ±0.05 6.50 ±0.05 5.10 ±0.05 4.42 ±0.05 4.50 ±0.05 (4 SIDES) 4.42 ±0.05 PACKAGE OUTLINE 0.25 ±0.05 0.50 BSC RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED 6.00 ± 0.10 (4 SIDES) 0.75 ± 0.05 R = 0.10 TYP R = 0.115 TYP 39 40 0.40 ± 0.10 PIN 1 TOP MARK (SEE NOTE 6) 1 4.50 REF (4-SIDES) 4.42 ±0.10 2 PIN 1 NOTCH R = 0.45 OR 0.
LTC3855 Related Parts PART NUMBER DESCRIPTION COMMENTS LTC3853 Triple Output, Multiphase Synchronous Step-Down DC/DC Controller, RSENSE or DCR Current Sensing and Tracking Phase-Lockable Fixed 250kHz to 750kHz Frequency, 4V ≤ VIN ≤ 24V, VOUT3 Up to 13.5V LTC3731 3-Phase Synchronous Controller, Expandable to 12 phases Differential Amp, High Output Current 60A to 240A Phase-Lockable Fixed 250kHz to 600kHz Frequency, 0.6V ≤ VOUT ≤ 5.25V, 4.
