SiP12116 www.vishay.com Vishay Siliconix Reference Board User Manual for SiP12116 (3 A) FEATURES PRODUCT SUMMARY 4.5 V to 15 V input voltage Input Voltage Range 3 V to 15 V Adjustable output voltage down to 0.6 V Output Voltage range 0.6 V to 5.5 V 3 A continuous output current Operating Frequency 600 kHz Operational frequency 600 kHz Continuous Output Current 3 A 95 % peak efficiency Package DFN10 - 3 mm x 3 mm Stable with any capacitor. No external ESR network required DESCRIPTION Ultrafast transient response The SiP12116 is a high frequency current-mode Current mode constant on time constant-on-time (CM-COT) synchronous buck regulator with integrated high-side and low-side power MOSFETs. Power saving scheme for increased light load efficiency The SiP12116 is capable of 3 A continuous current. 2 % accuracy of V setting OUT This regulator provides an adjustable output voltage Cycle-by-cycle current limit which in standard setup can output 5 V down to 0.6 V Fully protected with OTP, SCP, UVP, OVP to accommodate a variety of applications, including computing, consumer electronics, telecom, and industrial. P indicator GOOD The CM-COT architecture delivers ultra-fast transient -40 C to +125 C operating junction temperature response with minimum output capacitance and tight ripple regulation at very light load. The parts are stable with any APPLICATIONS capacitor type and no ESR network is required for loop Point of load regulation for low-power processors, stability. The regulator integrates a full protection feature network processors, DSPs, FPGAs, and ASICs set, it also has UVLO for the input rail and an internal Low voltage, distributed power architectures with 5 V or soft-start. 12 V rails The SiP12116 is available in lead (Pb)-free power enhanced Computing, broadband, networking, LAN / WAN, optical, 3 mm x 3 mm DFN-10 package. test, and measurement SPECIFICATIONS A/V, high density cards, storage, DSL, STB, DVR, DTV, industrial PC This reference board allows the end user to evaluate the SiP12116 chip for its features and all functionalities. It can CONNECTION AND SIGNAL / TEST POINTS also be a reference design for a user s application. Power Sockets V GND (P1): input voltage source with V to be positive. IN, IN ORDERING INFORMATION Connect to a voltage source: BOARD PART NUMBER MAX. OUTPUT CURRENT V SiP12116 - 3 V to 15 V OUT SiP12116DB 3 A 3.3 V V , GND (P2): output voltage with V to be positive. OUT OUT Connect to a load that draws no more than: SiP12116 - 3 A SELECTION JUMPERS Enable P3: this needs a jumper in place to disable the part. When the jumper is removed the part will enable. It is advisable to apply V and then enable the part. IN SIGNALS AND TEST LEADS Input Voltage Sense V , GND (P6): this allows the user to measure IN SENSE IN SENSE the voltage at the input of the regulator and remove any losses generated due to the, connections from the measurement. This can also be used by a power source with sense capability. Revision: 03-Sep-14 Document Number: 63419 1 For technical questions, contact: powerictechsupport vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc 91000SiP12116 www.vishay.com Vishay Siliconix Output Voltage Sense reasonable ripple current, we recommend around 50 % as a start point. V , GND (P5): this allows the user to OUT SENSE OUT SENSE measure the voltage at the output of the regulator and Other than the inductance the DCR and saturation current 2 remove any losses generated due to the connections, from parameters are key values. The DCR causes an I R loss which will decrease the system efficiency and generate the measurement. This can also be used by an active load with sense capability. heat. The saturation current has to be higher than the maximum output current plus 1/2 the ripple current. In over Power Good Indication current condition the inductor current may be very high. All PGD (P4): is an open drain output and is pulled up with a this needs to be considered when selecting the inductor. 10 k resistor to V . When V is within 50 % percent IN FB On this board Vishay IHLP series inductors are used to meet of the set voltage this pin will go HI to indicate the output cost requirement and high efficiency, a part that utilizes a is okay. material that has incredible saturation levels compared to POWER UP PROCEDURE competing products. Output Capacitor Selection To turn-on the reference board, apply 12 V to V with the P3 IN jumper is in position (this disables the part). Voltage rating, ESR, transient response, overall PCB area To enable the part remove P3, a voltage can now be and cost are requirements for selecting output capacitors. observed at the output. The types of capacitors and there general advantages and disadvantages are covered next. Note Note: When applying higher than 12 V to the input it is Electrolytic have high ESR, dry out over time so ripple reasonable to install a RC snubber from LX to GND. There are current rating must be examined and have slower transient place holders on the reference board R7 and C10 for the response, but are fairly inexpensive for the amount of overall snubber. Values of 10 and 1 nF are a reasonable starting point. capacitance. ADJUSTMENTS TO THE REFERENCE BOARD Tantalums can come in low ESR varieties and high Output Voltage Adjustment capacitance value for its overall size, but they fail short when damaged and also have slower transient response. If a different output voltage is needed, simply change the value of V and solve for R3 based on the following Ceramics have very low ESR, fast transient response and OUT formula: overall small size, but come in low capacitance values compared to the others above. A combination of technology ()V - V OUT FB is sensible. R3 = R4 x ----------------------------------- V FB Enable Pin Voltage Where V is 0.6 V for the SiP12116. FB The ENL pin will need to be set to enable the part. This pin Output Ripple Voltage accepts an input voltage up to 5 V. On the reference design the pin has a voltage divider from V . There is also a jumper, IN Output ripple voltage is measured with a tip and barrel P3, which shorts the pin to GND, this can be removed when measurement across C . Typically output ripple voltage is OUT a suitable voltage has been applied to V enabling the IN set to 3 % to 5 % of the output voltage, but an all ceramic device. output solution can bring output ripple voltage to a much lower level since the ESR of ceramics is very small. Bootstrap Circuit If ceramics or a combination of ceramics and bulk A bootstrap capacitor of 100 nF will be sufficient for this capacitors are used it may be necessary to add a voltage circuit with a switching frequency of 600 kHz. A series injection network. resistor has been added in order to slow down the low side switch and minimize overshoot without adding a snubber. Inductor Selection This is user adjustable. This can be reduced to 0R to The choice of inductor is specific to each application and improve efficiency. quickly determined with the following equations: V Decoupling DD V OUT ---------------------------------------- t = on The V pin will need to be decoupled in order to provide a DD V f IN MAX. SW stable voltage internally and externally. The value for this ()V V t IN OUT on capacitor is recommended as 1 F. L = ----------------------------------------------- I k OUT MAX. Current Limit The current limit is set internally to 4.8 A. This will include the Where k is a percentage of maximum output inductor ripple output current plus half of the ripple current. If the output current required. The designer can quickly make a choice if current is greater than this value the current limit will be the ripple percentage is already decided based on the activated. system design it should be noted that the SiP12116 uses an internal current sense mechanism which translates as the voltage ripple component. The SiP12116 requires a Revision: 03-Sep-14 Document Number: 63419 2 For technical questions, contact: powerictechsupport vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc 91000