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NCP5424A Dataheets PDF



Part Number NCP5424A
Manufacturers ON Semiconductor
Logo ON Semiconductor
Description Dual Synchronous Buck Controller
Datasheet NCP5424A DatasheetNCP5424A Datasheet (PDF)

NCP5424A Dual Synchronous Buck Controller with Input Current Sharing The NCP5424A is a flexible dual N−channel synchronous buck controller utilizing V2™ control for fast transient response and excellent line and load regulation. This highly versatile controller can be configured as a single two phase output converter that draws programmable amounts of current from two different input voltages or all current from one supply. The NCP5424A can also be configured as two independent out−of−phase con.

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NCP5424A Dual Synchronous Buck Controller with Input Current Sharing The NCP5424A is a flexible dual N−channel synchronous buck controller utilizing V2™ control for fast transient response and excellent line and load regulation. This highly versatile controller can be configured as a single two phase output converter that draws programmable amounts of current from two different input voltages or all current from one supply. The NCP5424A can also be configured as two independent out−of−phase controllers. Using the NCP5424A in a current sharing input configuration is ideal for applications where more power is required than is available from one supply, such as video cards or other plug−in boards. When configured as a dual output controller, the output of one controller can be divided down and used as the reference for the second controller. This tracking capability is useful in applications such as Double Data Rate (DDR) Memory power where the termination voltage must track VDD. The NCP5424A provides a cycle−to−cycle current limit allowing the system to handle transient overcurrent events. In addition, the NCP5424A provides Soft Start, undervoltage lockout, and built−in adaptive FET nonoverlap time to prevent shoot through. Features • Cycle−to−Cycle Current Limit • Programmable Soft Start • 100% Duty Cycle for Enhanced Transient Response • 150 kHz to 600 kHz Programmable Frequency Operation • Switching Frequency Set by Single Resistor • Out−Of−Phase Synchronization Between the Channels Reduces the Input Filter Requirement • Undervoltage Lockout Applications • Video Graphics Card • DDR Memory • High Current (Two−Phase) Power Supplies • Dual Output DC−DC Converters http://onsemi.com 16 1 SO−16 D SUFFIX CASE 751B PIN CONNECTIONS AND MARKING DIAGRAM 1 GATE(H)1 GATE(L)1 GND BST IS+1 IS− VFB1 COMP1 NCP5424A AWLYWW 16 GATE(H)2 GATE(L)2 VCC ROSC IS+2 VFB+2 VFB−2 COMP2 A = Assembly Location WL = Wafer Lot Y = Year WW = Work Week ORDERING INFORMATION Device NCP5424AD NCP5424ADR2 Package SO−16 SO−16 Shipping 48 Units/Rail 2500 Tape & Reel © Semiconductor Components Industries, LLC, 2003 August, 2003 − Rev. 0 1 Publication Order Number: NCP5424A/D 12 V 5.0 V + C2 + C1 220 µF 220 µF NCP5424A + C17 220 µF 3.3 V + C18 220 µF C6 0.1 µF R1 R2 xk xk L2 + C3/4/5 1.3 µH/15 A 680 µF/ 4V Q3 MTD60N03 Q4 MTD90N02 R3 x k ± 1% R4 x k ± 1% R5 5 k ± 1% C8 .22 µF R6 10 k ± 1% C11 1.0 µF U1 VCC BST GATE(H)1 GATE(H)2 GATE(L)1 GATE(L)2 IS+1 IS+2 NCP5424A IS− VFB+2 COMP1 COMP2 VFB1 GND VFB−2 ROSC R12 30.9 k Q1 MTD60N03 L1 1.3 µH/15 A Q2 MTD90N02 R17 4k C14 0.1 µF C19/20/21 + 680 µF/ 4V C13 0.01 µF 1.5 V @ 20 A Figure 1. Two−Phase Buck Regulator Application, with Input Current Sharing http://onsemi.com 2 NCP5424A MAXIMUM RATINGS* Rating Operating Junction Temperature, TJ Storage Temperature Range, TS ESD Susceptibility (Human Body Model) Package Thermal Resistance, SO−16: Junction−to−Case, RθJC Junction−to−Ambient, RθJA Lead Temperature Soldering: 1. 60 second maximum above 183°C. *The maximum package power dissipation must be observed. Reflow: (SMD styles only) (Note 1) Value 150 −65 to +150 2.0 28 115 230 peak Unit °C °C kV °C/W °C/W °C MAXIMUM RATINGS Pin Symbol VCC COMP1, COMP2 VFB1, VFB+2, VFB−2 BST ROSC GATE(H)1, GATE(H)2 GATE(L)1, GATE(L)2 GND IS+1, IS+2 IS− Pin Name IC Power Input Compensation Capacitor for Channel 1 or 2 Voltage Feedback Input for Channel 1 or 2 Power Input for GATE(H)1, 2 Oscillator Resistor High−Side FET Driver for Channel 1 or 2 Low−Side FET Driver for Channel 1 or 2 Ground Positive Current Sense for Channel 1 or 2 Negative Current Sense for Channels 1 and 2 VMAX 16 V 4.0 V 5.0 V 20 V 4.0 V 20 V 16 V 0V 6.0 V 6.0 V VMIN −0.3 V −0.3 V −0.3 V −0.3 V −0.3 V −0.3 V −0.3 V 0V −0.3 V −0.3 V ISOURCE N/A 1.0 mA 1.0 mA N/A 1.0 mA 1.5 A peak 200 mA DC 1.5 A peak 200 mA DC 1.5 A peak 200 mA DC 1.0 mA 1.0 mA ISINK 1.5 A peak 200 mA DC 3.5 mA 1.0 mA 1.5 A peak 200 mA DC 1.0 mA 1.5 A peak 200 mA DC 1.5 A peak 200 mA DC N/A 1.0 mA 1.0 mA http://onsemi.com 3 NCP5424A ELECTRICAL CHARACTERISTICS (0°C < TA < 70°C; 0°C < TJ < 125°C; ROSC = 30.9 k, CCOMP1,2 = 0.1 µF, 10.8 V < VCC < 13.2 V; 10.8 V < BST < 20 V, CGATE(H)1,2 = CGATE(L)1,2 = 1.0 nF, VFB+2 = 1.0 V; unless otherwise specified.) Characteristic Test Conditions Min Typ Max Error Amplifier VFB Bias Current VFB1(2) Input Range COMP1,2 Source Current COMP1,2 Sink Current Reference Voltage 1(2) COMP1,2 Max Voltage COMP1,2 Min Voltage Open Loop Gain VFBX = 0 V Note 2 COMP1,2 = 1.2 V to 2.5 V; VFB1(−2) = 0.8 V COMP1,2 = 1.2 V; VFB1(−2) = 1.2 V COMP1 = VFB1; COMP2 = VFB−2 VFB1(−2) = 0.8 V VFB1(−2) = 1.2 V − − 0 15 15 0.980 3.0 − − 0.5 − 30 30 1.000 3.3 0.25 95 1.6 1.1 60 60 1.020 − 0.35 − Unity Gain Band Width − − 40 − PSRR @ 1.0 kHz − − 70 − Transconductance − − 32 − Output Impedance − − 2.5 − Input Offset, Error Amp. 2 − −3.0 0 3.0 Error Amp. 2 Common Mode Range Note 2 1.75 2.0 − GATE(H).


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