FDMF6704 Fairchild Semiconductor, FDMF6704 Datasheet
FDMF6704
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FDMF6704 Summary of contents
Page 1
... DrMOS family is Fairchild’s next-generation fully- optimized, ultra-compact, integrated MOSFET plus driver power stage solutions for high current, high frequency synchronous buck DC-DC applications. The FDMF6704 XS integrates a driver IC, two power MOSFETs and a bootstrap Schottky diode into a thermally enhanced, ultra compact MLP package. With an integrated approach, the complete ...
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... DISB# PWM SMOD# Pin Configuration PWM 40 CGND DISB CGND VSWH 35 VSWH 34 VSWH VSWH 33 43 VSWH 32 VSWH 31 Bottom View FDMF6704 Rev. G VCIN VDRV Overlap Control Figure 2. Functional Block Diagram VIN 11 VIN 11 VIN VIN 12 VIN 12 42 VIN 13 VIN 13 VIN 14 VIN 14 VSWH 15 VSWH 15 PGND ...
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... V Output Stage Supply Voltage IN * May be operated at lower input voltage. See figure 10. FDMF6704 Rev. G Function When SMOD# = HI, low side driver is inverse of PWM input. When SMOD# = Low, low side driver is disabled. This pin has no internal pullup or pulldown. It should not be left floating. Do not add noise filter cap. ...
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... Propagation Delay Time High Side Driver Rise Time Fall Time Deadband Time Propagation Delay Low Side Driver Rise Time Fall Time Deadband Time Propagation Delay 250 ns Time Out Circuit 250 ns Time Delay FDMF6704 Rev. G Symbol Conditions PWM = GND IQ PWM = V CIN CIN CIN ...
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... Description of Operation Circuit Description The FDMF6704 is a driver plus FET module optimized for synchronous buck converter topology. A single PWM input signal is all that is required to properly drive the high-side and the low-side MOSFETs. Each part is capable of driving speeds MHz. PWM When the PWM input goes high, the high side MOSFET turns on ...
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... Fairchild's DrMOS products have proprietary feature* that minimizes the peak overshoot and ringing voltage on the switch node (VSWH) output, without the need of external snubbers. The following pictures show the waveforms of an FDMF6704 DrMOS part and a competitor's part tested without snubbing. The tests were done in the same test circuit, under the same operating conditions. ...
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... 0. 1.3 V OUT OUT 0. 440 350 kHz SW 0.89 4.5 4.8 5.1 Driver Supply Voltage, V Figure 11. Power Loss vs. Driver Supply Voltage FDMF6704 Rev 1.3 V OUT 440 100 125 150 o C Figure 8. Module Power Loss vs. Output Current 1.16 1.14 1.12 1 ...
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... Figure 15. Driver Supply Current vs. Drive Supply Voltage 5.0 4.5 ON STATE 4.0 3.5 3.0 TRI STATE 2.5 2.0 1.5 1.0 0.5 0.0 4.5 5.0 Driver Supply Voltage, V Figure 17. PWM Tri-state Threshold Voltage vs. Driver Supply Voltage FDMF6704 Rev CIN 385 440 200 300 Figure 14. Driver Supply Current vs. Frequency ...
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... Driver Supply Voltage, V Figure 19. SMOD# Threshold Voltage vs. Driver Supply Voltage 2.2 2 1.8 1.6 1.4 1.2 1.0 4.5 4.8 5.0 5.3 Driver Supply Voltage, V Figure 21. DISB# Threshold Voltage vs. Driver Supply Voltage FDMF6704 Rev CIN 2.0 1.8 1 1.4 1.2 1.0 -50 -25 5.5 5.8 6 ...
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... Application Information Supply Capacitor Selection For the supply input (VCIN) of the FDMF6704, a local ceramic bypass capacitor is recommended to reduce the noise and to supply the peak current. Use at least X7R or X5R capacitor. Keep this capacitor close to the FDMF6704 VCIN and PGND pins. Bootstrap Circuit The bootstrap circuit uses a charge storage capacitor (C as shown in Figure 23 ...
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... Following is a guideline which the PCB designer should consider: 1. Input ceramic bypass capacitors must be close to VIN and PGND pin of FDMF6704 to help reduce the input current ripple component induced by switching operation. 2. The VSWH copper trace serves two purposes. In addition to being the high frequency current path from the DrMOS package to the output inductor, it also serves as heatsink for the lower FET in the DrMOS package ...
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... TOP VIEW FDMF6704 Rev. G Figure 25. Typical PCB Layout Example 12 BOTTOM VIEW www.fairchildsemi.com ...
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... Dimensional Outline and Pad layout FDMF6704 Rev www.fairchildsemi.com ...
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... TRADEMARKS The following includes registered and unregistered trademarks and service marks, owned by Fairchild Semiconductor and/or its global subsidiaries, and is not intended exhaustive list of all such trademarks. AccuPower™ FPS™ Auto-SPM™ F-PFS™ FRFET Build it Now™ CorePLUS™ Global Power Resource CorePOWER™ ...