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LTC4443IDD-1-PBF Datasheet(PDF) 10 Page - Linear Technology |
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LTC4443IDD-1-PBF Datasheet(HTML) 10 Page - Linear Technology |
10 / 12 page LTC4443/LTC4443-1 10 4443fa APPLICATIONS INFORMATION TYPICAL APPLICATION LTC7510/LTC4443-1 12V to 1.5V/30A Digital Step-Down DC/DC Converter with PMBus Serial Interface Bypassing and Grounding The LTC4443 requires proper bypassing on the VLOGIC, VCC and VBOOST – TS supplies due to its high speed switching (nanoseconds) and large AC currents (Amperes). Careless component placement and PCB trace routing may cause excessive ringing and undershoot/overshoot. To obtain the optimum performance from the LTC4443: A. Mount the bypass capacitors as close as possible between the VLOGIC and GND pins, the VCC and GND pins, and the BOOST and TS pins. The leads should be shortened as much as possible to reduce lead inductance. B. Use a low inductance, low impedance ground plane to reduce any ground drop and stray capacitance. Remember that the LTC4443 switches greater than 5A peak currents and any significant ground drop will degrade signal integrity. C. Plan the power/ground routing carefully. Know where the large load switching current is coming from and going to. Maintain separate ground return paths for the input pin and the output power stage. D. Keep the copper trace between the driver output pin and the load short and wide. E. Be sure to solder the Exposed Pad on the back side of the LTC4443 packages to the board. Correctly soldered to a double-sided copper board, the LTC4443 has a thermal resistance of approximately 43°C/W. Failure to make good thermal contact between the exposed back side and the copper board will result in thermal resistances far greater. TG BOOST C5 0.22μF M1 RJK0305 2 M2 RJK0301 2 VOUT 330μF 6 4443 TA02 L1 0.3μH R3 C6 GND TS VLOGIC VCC LTC4443-1 BG IN C4 C3 1μF R2 + C2 C1 1k RSENSE RCM D1 R1 LOAD RTN V12SEN SDATA SCLK SMB_AL_N PWRGD OUTEN SYNC_IN SYNC_OUT FAULT1 FAULT2 IOUT/ISH ISH_GND VCC PMBus INTERFACE VD33 VD25 7V DRIVE 12V 5V GND LTC7510 PWM TEMPSEN RESET_N ISENN ISENP VSENP VSENN SADDR VSET FSET VTRIM IMAXSET 1k 1k 1k 1k POWER MANAGEMENT INTERFACE MULTIPHASE INTERFACE FAULT OUTPUTS I-SHARE + |
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