SiP12109DB, SiP12110DB www.vishay.com Vishay Siliconix Demo Board User Manual for SiP12109 (4 A) and SiP12110 (6 A), 4.5 V to 15 V Input Synchronous Buck Regulators THE CHIP FEATURES PRODUCT SUMMARY SiP12109DMP-T1-GE4 4.5 V to 15 V input voltage Input Voltage Range 4.5 V to 15 V Adjustable output voltage down to 0.6 V Output Voltage Range 0.6 V to 5.5 V 4 A (SiP12109)/6 A (SiP12110) continuous output current Operating Frequency 400 kHz to 1.5 MHz Selectable switching frequency from 400 kHz to 1.5 MHz Continuous Output Current 4 A with an external resistor Package QFN16 3 mm x 3 mm 95 % peak efficiency Stable with any capacitor. No external ESR network required PRODUCT SUMMARY SiP12110DMP-T1-GE4 Ultrafast transient response Input Voltage Range 4.5 V to 15 V Power saving scheme for increased light load efficiency Output Voltage Range 0.6 V to 5.5 V 1 % accuracy of V setting Operating Frequency 400 kHz to 1.5 MHz OUT Continuous Output Current 6 A Cycle-by-cycle current limit Package QFN16 3 mm x 3 mm Fully protected with OTP, SCP, UVP, OVP PGOOD Indicator -40 C to +125 C operating junction temperature DESCRIPTION Output voltage tracking The SiP12109 and SiP12110 are high frequency current-mode constant-on-time (CM-COT) synchronous APPLICATIONS buck regulator with integrated high-side and low-side power Point of load regulation for low-power processors, MOSFETs. The SiP12109 is capable of 4 A continuous network processors, DSPs, FPGAs, and ASICs current and the SiP12110 is capable of 6 A. These regulators produce an adjustable output voltage down to 0.6 V Low voltage, distributed power architectures with 5 V or from 4.5 V to 15 V input rail to accommodate a variety of 12 V rails applications, including computing, consumer electronics, Computing, broadband, networking, LAN / WAN, optical, telecom, and industrial. test, and measurement The CM-COT architecture delivers ultra-fast transient A/V, high density cards, storage, DSL, STB, DVR, DTV, response with minimum output capacitance and tight ripple industrial PC regulation at very light load. The parts are stable with any capacitor type and no ESR network is required for loop stability. The devices also incorporate a power saving ORDERING INFORMATION scheme that significantly increases light load efficiency. The DEMO BOARD PART NUMBER MAX. OUTPUT CURRENT regulator integrates a full protection feature set, including SiP12109DB 4 A output overvoltage protection (OVP), output under voltage SiP12110DB 6 A protection (UVP) and thermal shutdown (OTP). It also has UVLO for the input rail and an internal soft-start. The SiP12109 is available in lead (Pb)-free power enhanced SPECIFICATION 3 mm x 3 mm QFN-16 package. This reference board allows the end user to evaluate the SiP12109 or the SiP12110 chip for its features and all functionalities. It can also be a reference design for a users application. Input voltage (V): 4.5 to 15 Output voltage (V): 0.6 to 5 Output current (A): 0 to 4 for SiP12109, 0 to 6 for SiP12110 Revision: 30-Jan-14 Document Number: 64324 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 91000SiP12109DB, SiP12110DB www.vishay.com Vishay Siliconix CONNECTION AND SIGNAL / TEST POINTS CHANGING SWITCHING FREQUENCY The following equation illustrates the relationship between Power Sockets ON-time, V , V , and R value: IN OUT ON V (J1), GND (J4): Input voltage source with V to be IN IN positive. Connect to a 4.5 V to 16 V source that powers V OUT SiP12109. T = R x K x , ON ON V IN V (J2), GND (J3): Output voltage with V to be OUT OUT -12 where K is a constant set internally. ( K = 17 x 10 ) positive. Connect to a load that draws less than 4 A current. Once ON time is set, pseudo constant frequency is then SIGNAL AND TEST LEADS determined by the following equation: EN (J5): When the pin is grounded the SiP12109 is disabled. V OUT A voltage above ~ 1.5 V will be seen as HI and enable the V V D IN OUT Fsw = = = part allowing switching to occur. 1 T R x K ON x R x K ON ON V PGD(J6): Is an open drain output and is pulled up with a IN 100 k resistor to V . When FB or V are within 25 IN OUT percent of the set voltage this pin will go HI to indicate the OUTPUT RIPPLE VOLTAGE output is okay. Output ripple voltage is measured at the a tip and barrel measurement across C or use the probe jack located at OUT POWER UP PROCEDURE V . Typically output ripple voltage is set to 3 % to 5% of OUT To turn-on the reference board, apply 12 V to V and the output voltage, but an all ceramic output solution can IN another supply > 1.5 V to the EN pin J10. The board will bring output ripple voltage to a much lower level since the come up in ECO power save mode with an output voltage ESR of ceramics is very small. This can cause stability preset to 1.2 V. This will allow much higher efficiency due to issues with other COT controllers, which require a minimum lower switching frequency at zero to very light loads. As the ripple voltage, but not with the SIP12109 which uses current load increases the frequency will increase until the nominal mode control. The SiP12109 can work with any type of set frequency (preset to ~ 1 MHz) is reached. output capacitors that suits your needs. When applying higher than 12 V to the input it is INDUCTOR SELECTION recommended to install a RC snubber from LX to GND. There are place holders on the reference board R4 and C23 Knowing V , V , Fsw, full load current and choosing a IN OUT for the snubber. Values of 5.6 and 0.39 nF are a ripple current (I) that s between 20 % to 50 % of full load reasonable starting point. current we can calculate an inductor value. V OUT COMMON ADJUSTMENTS MADE TO THE L = (V - V ) x IN OUT Fsw x V x I x I IN OUT max. REFERENCE BOARD OUTPUT VOLTAGE ADJUSTMENT 1.2 = (12 V - 1.2 V) x = 1 H The evaluation board is configured for a 1.2 V output. If a 6 1 x 10 x 12 V x 0.25 x 4 A different output voltage is needed, simply change the value of V and solve for R11 based on the following formula: OUT INPUT CAPACITORS The input capacitors are chosen as a combination of bulk V ref 0.6 V and ceramic capacitors, to satisfy cost, RMS current, ESR, R11 = R7 x = 5.11 k x = 5.11 k input voltage ripple requirements and a source for V - V 1.2 V - 0.6 V OUT ref instantaneous energy and filtering that the converter may require. INDUCTORS Other than the inductance the DCR and saturation current 2 parameters are key values. The DCR causes an I R loss which will decrease the system efficiency and generate heat. The saturation current has to be higher than the maximum output current plus 1/2 the ripple current. In over current condition the inductor current may be very high. All this needs to be considered when selecting the inductor. On this board Vishay IHLP-2525EZ series inductors are used to meet cost requirement and get better efficiency and utilizes a material that has incredible saturation levels compared to competing products. Revision: 30-Jan-14 Document Number: 64324 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