sic417 Vishay, sic417 Datasheet
sic417
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sic417 Summary of contents
Page 1
... The Vishay-Siliconix SiC417 is an advanced stand-alone synchronous buck regulator featuring integrated power MOSFETs, bootstrap diode, and a programmable LDO in a space-saving MLPQ pin package. The SiC417 is capable of operating with all ceramic solutions and switching frequencies MHz. The programmable frequency, synchronous ...
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... V power input for internal analog circuits and gate drives. Connect to external 5 V supply or configure the 3 V5V LDO for 5 V and connect 30, PAD 1 A Analog ground. GND 5 V Output voltage input to the SiC417. Additionally, may be used to bypass LDO to supply V OUT 11, PAD 2 V Input supply voltage LDO output. LDO Bootstrap pin ...
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... A Symbol AG-PG Symbol Min. V 3.0 IN V5V 4.5 V 0.5 OUT Symbol Min STG SiC417 Vishay Siliconix PAD BST 28, PAD 3 P GND 15-22 I LIM 27 Min. Max. Unit - 0 ...
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... SiC417 Vishay Siliconix THERMAL RESISTANCE RATINGS Thermal Resistance, Junction-to-Ambient High-Side MOSFET Low-Side MOSFET PWM Controller and LDO Thermal Resistance Peak IR Reflow Temperature Note: a. This device is ESD sensitive. Use of standard ESD handling precautions is required. b. Calculated from package in still air, mounted 4.5 (in), 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards. ...
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... (A) OUT Efficiency vs. Output Current (V OUT SiC417 Vishay Siliconix = + 25 °C for typ., Min. Typ. Max GND - 150 2 0 GND GND 0.735 ...
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... SiC417 Vishay Siliconix ELECTRICAL CHARACTERISTICS 300 250 200 150 100 (A) OUT Frequency vs OUT OUT Start up Time 1 OUT Transient Response dI/dt = 0.5 A/µs OUT www.vishay.com ...
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... SiC417 Synchronous Buck Converter The SiC417 is a step down synchronous buck dc-to-dc converter with integrated power FETs and programmable LDO. The SiC417 is capable operation at very high efficiency in a tiny pin package. The programmable operating frequency range of 200 kHz to 1 MHz, enables the user to optimize the solution for minimum board space and optimum efficiency ...
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... The SiC417 uses an external resistor to set the ontime which indirectly sets the frequency. The on-time can be programmed to provide operating frequency from 200 kHz to 1 MHz using a resistor between the t ON resistor value is selected by the following equation ns ...
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... FB threshold. FB Figure 4 - Forced Continuous Mode Operation Ultrasonic Power-Save Operation The SiC417 provides ultra-sonic power-save operation at light loads, with the minimum operating frequency fixed at 25 kHz. This is accomplished using an internal timer that monitors the time between consecutive high-side gate pulses. ...
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... DL turns on when smart PSAVE threshold is reached DL turns off FB threshold is reached Figure 7 - Smart Power-Save Current Limit Protection The SiC417 features programmable current limit capability, which is accomplished by using the R MOSFET for current sensing. The current limit is set by R resistor. The R resistor connects from the I ILIM LX pin which is also the drain of the low-side MOSFET. When the low-side MOSFET is on, an internal ~ 10 µ ...
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... V complete LDO is turned off which saves power. This gives us the maximum efficiency out of the SiC417. If the LDO output is used to bias the SiC417, then after switchover the V self-powered mode. Steps to follow when using the on chip LDO to bias the SiC417: • ...
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... OUT If either higher than V5V, then the respective LDO OUT diode will turn on and the SiC417 operating current will flow through this diode. This has the potential of damaging the device. ENL Pin and V UVLO IN The ENL pin also acts as the switcher under-voltage lockout for the V supply ...
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... This will cause a peak voltage on the capacitor according to the following equation. Assuming a peak voltage V load release), and load release, the required capacitance is shown by the next equation. INMAX. SiC417 Vishay Siliconix to 4.4 A. RIPPLE conditions is also checked using the IN ...
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... SiC417 Vishay Siliconix If the load release is relatively slow, the output capacitance can be reduced. At heavy loads during normal switching, when the FB pin is above the 500 mV reference, the DL output is high and the low-side MOSFET is on. During this time, the voltage across the inductor is approximately - V This causes a down-slope or falling di/dt in the inductor ...
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... The error comparator off set is trimmed so that under static conditions it trips when the feedback pin is 500 mV The on-time pulse from the SiC417 in the design example is calculated to give a pseudo-fixed frequency of 250 kHz. Some frequency variation with line and load is expected. ...
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... SiC417 Vishay Siliconix SiC417 EVALUATION BOARD SCHEMATIC A GND R15 0 Ω 22 µ C18 R16 C13 1 µ Ω IP_V IN IN µ 10 µ 10 µ 10 µ IN- DL IP_V IN- V OUT R11 10K Loadstep M1 Loadstep R12 R13 10K 11 BILL OF MATERIALS Ref ...
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... PCB LAYOUT OF THE EVALUATION BOARD Figure 16. PCB Layout - Top Layer Figure 18. PCB Layout - MidLayer2 Document Number: 69062 S09-0799-Rev. B, 11-May-09 New Product Figure 17. PCB Layout - MidLayer1 Figure 19. PCB Layout - Bottom Layer SiC417 Vishay Siliconix www.vishay.com 17 ...
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... SiC417 Vishay Siliconix PACKAGE DIMENSIONS AND MARKING INFO Vishay Siliconix maintains worldwide manufacturing capability. Products may be manufactured at one of several qualified locations. Reliability data for Silicon Technology and Package Reliability represent a composite of all qualified locations. For related documents such as package/tape drawings, part marking, and reliability data, see www ...
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... Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any information provided herein to the maximum extent permitted by law. The product specifications do not expand or otherwise modify Vishay’ ...