SIP12117DMP-T1-GE4

SiP12117 www.vishay.com Vishay Siliconix 3 A Current Mode Constant On-Time Synchronous Buck Regulator FEATURES • 4.5 V to 15 V input voltage SiP • Adjustable output voltage down to 0.6 V 12 • 3 A continuous output current 11 7 • Integrated compensation • 600 kHz switching frequency • Ultrafast transient response • < 5 μA typical shutdown current DESCRIPTION • Cycle by cycle current limit The SiP12117 is a high frequency current-mode constant on-time (CM-COT) synchronous buck regulator with integrated high side and low side power MOSFETs. Its power stage is capable of supplying up to 3 A continuous current at 600 kHz switching frequency. This regulator produces an adjustable output voltage down to 0.6 V from 4.5 V to 15 V input rail to accommodate a variety of applications, including consumer electronics, computing, telecom, and industrial. • Power good function SiP12117’s CM-COT architecture delivers ultrafast transient response and low ripple over the full load range with minimum output capacitance and no ESR requirements. The device features a built in soft start of 2.9 ms and integrated compensation. • LCD TV The device also includes cycle-by-cycle current limit, over temperature protection (OTP) and input under voltage lockout (UVLO). The SiP12117 is available in lead (Pb)-free 3 mm x 3 mm DFN10-33C lead package with thermal pad. • Fixed soft start: 2.9 ms, typ. • Material categorization: for definitions of compliance please see www.vishay.com/doc?99912 APPLICATIONS • Graphics cards • Set-top-box • Notebook computers • HDD / SSD       TYPICAL APPLICATION CIRCUIT AND PACKAGE OPTIONS Enable Power good Input PGOOD 4.5 V to 15 V EN VOUT VIN VCC BOOT LX SiP12117 FB PGND Fig. 1 - Typical Application Circuit for SiP12117 S20-0484-Rev. C, 29-Jun-2020 Document Number: 62973 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?91000 SiP12117 www.vishay.com Vishay Siliconix PIN CONFIGURATION EN 10 PGOOD 9 BOOT 8 1 FB AGND pad 2 VCC 3 VIN LX 7 4 PGND LX 6 5 PGND Fig. 2 - SiP12117 Pin Configuration (Bottom View) PIN CONFIGURATION PIN NUMBER NAME FUNCTION 1 FB Feedback voltage 0.6 V (typ.) input. Use a resistor divider between VOUT and thermal pad to set the output voltage 2 VCC Internal regulator output 3 VIN Input supply voltage for power MOS and regulator. VIN = 4.5 V to 15 V 4, 5 PGND 6, 7 LX Power ground Switching node, inductor connection point 8 BOOT Bootstrap pin - connect a capacitor of at least 100 nF from BOOT to LX to develop the floating supply for the high side gate driver 9 PGOOD Power good output. Open drain 10 EN Pad AGND Enable input. Pull enable above 1.5 V to enable and below 0.4 V to disable the part. Do not float this pin Analog ground. The pad also improves thermal performance ORDERING INFORMATION PART NUMBER SiP12117DMP-T1-GE4 PACKAGE MARKING (LINE 1: P/N) DFN10 3 x 3 2117 SiP12117DB Reference board MARKING P/N FYWLL Format: Line 1: Dot Line 2: P/N Line 3: Siliconix logo + ESD dymbol Line 4: Factory code + year code + work week code + LOT code S20-0484-Rev. C, 29-Jun-2020 Document Number: 62973 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 SiP12117 www.vishay.com Vishay Siliconix ABSOLUTE MAXIMUM RATINGS ELECTRICAL PARAMETER CONDITIONS LIMIT VIN Reference to PGND -0.3 to 16 VCC Reference to AGND -0.3 to 6 LX Reference to PGND -1 to 16 LX (AC) 100 ns -2 to 17 10 ns -6 to 17 BOOT Reference to PGND -0.3 to VIN + VCC All logic input and output (EN, FB, PGOOD) Reference to AGND -0.3 to VCC + 0.3 UNIT V TEMPERATURE Junction temperature -40 to +150 Storage temperature -65 to +150 °C POWER DISSIPATION Junction-to-ambient thermal impedance (RthJA) 36.3 °C/W 2 kV ESD PROTECTION Electronic discharge protection HBM  Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. RECOMMENDED OPERATING RANGE (all voltages referenced to GND = 0 V) ELECTRICAL PARAMETER MINIMUM TYPICAL MAXIMUM VIN 4.5 - 15 VOUT 0.6 - 5.5 UNIT V TEMPERATURE Recommended ambient temperature -40 to +85 Operating junction temperature -40 to +125 S20-0484-Rev. C, 29-Jun-2020 °C Document Number: 62973 3 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 SiP12117 www.vishay.com Vishay Siliconix ELECTRICAL SPECIFICATIONS (test condition unless otherwise specified) PARAMETER SYMBOL TEST CONDITION VIN = 12 V, TA = -40 °C to +85 °C LIMITS MIN. TYP. MAX. UNIT POWER SUPPLY Input voltage VIN 4.5 - 15 VCC voltage VCC - 5 - Input current IVIN_NOLOAD - 1.5 - mA μA TA = 25 °C, non-switching, no load V Shutdown current IVIN_SHDN EN = 0 V - 5 10 VIN UVLO threshold VIN_UVLO Rising edge - 2.8 - V VIN UVLO hysteresis VIN_UVLO_HYS - 550 - mV CONTROLLER AND TIMING Feedback voltage VFB VFB input bias current IFB On-time (600 kHz) tON Soft start timing TA = 25 °C 588 600 612 TA = -40 °C to +85 °C 585 600 615 - - 100 nA - 138 - ns - 2.9 5 ms - 85 140 - 55 105 Inductor valley current, TA = 25 °C 3.6 4.25 5.1 Rising temperature - 145 - Hysteresis - 35 - VIN = 12 V, (VOUT = 1 V) (1) mV POWER MOSFETs High side on resistance RON_HS Low side on resistance RON_LS VGS = 5 V m FAULT PROTECTIONS Over current limit IOCP Over temperature protection (1) A °C POWER GOOD Power good output threshold VFB_RISING_VTH_OV Rising (% VOUT) - 95 - VFB_FALLING_VTH_UV Falling (% VOUT) - -10 - % Power good pull low resistance RON_PGOOD - 28 50  Power good delay time tDLY_PGOOD - 8 - μs Logic high level VEN_H 1.5 - - Logic low level VEN_L - - 0.4 ENABLE THRESHOLD V Note (1) Not tested, guaranteed by design S20-0484-Rev. C, 29-Jun-2020 Document Number: 62973 4 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 SiP12117 www.vishay.com Vishay Siliconix FUNCTIONAL BLOCK DIAGRAM VCC 2 PGOOD 9 EN 3 10 Regulator VIN BOOT 8 OTP 0.6 V reference BOOT UVLO Soft start + + OTA - 1 VFB + - Control logic section ON-time generator LX Anti-xcond control 6, 7 VCC PWM comparator Isense I-V converter ZCD PGND 4, 5 OCP PAD Isense Current mirror Fig. 3 - SiP12117 Functional Block Diagram S20-0484-Rev. C, 29-Jun-2020 Document Number: 62973 5 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 SiP12117 www.vishay.com Vishay Siliconix ELECTRICAL CHARACTERISTICS  (VIN = 12 V, VOUT = 1 V, L = 1.5 μH, C = 3 x 22 μF (ceramic), unless noted otherwise) 100 90 VOUT 50 mV/div 5 VOUT 80 1 VOUT Efficiency (%) 70 60 ICOIL 1 A/div 50 40 30 LX 10 V/div 20 10 0 0 0.5 1.0 1.5 2.0 2.5 3.0 IOUT (A) Fig. 4 - Efficiency vs. IOUT Fig. 7 - Steady-State, IOUT = 3 A, Time = 2 μs/div 1000 900 VOUT 50 mV/div Switching Frequency (kHz) 800 1 VOUT 700 600 500 5 VOUT ICOIL 1 A/div 400 300 200 LX 10 V/div 100 0 0 0.5 1.0 1.5 IOUT (A) 2.0 2.5 3.0 Fig. 8 - Steady-State, IOUT = 0 A, Time = 2 μs/div Fig. 5 - Frequency Variation vs. IOUT 1.0 0.8 Load Regulation (%) 0.6 0.4 5 VOUT 0.2 0 1 VOUT -0.2 -0.4 -0.6 -0.8 -1.0 0 0.5 1.0 1.5 IOUT (A) 2.0 2.5 3.0 Fig. 6 - Load Regulation vs. IOUT S20-0484-Rev. C, 29-Jun-2020 Document Number: 62973 6 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 SiP12117 www.vishay.com VOUT 50 mV/div ICOIL 2 A/div Vishay Siliconix VOUT 50 mV/div ICOIL 2 A/div LX 10 V/dIv LX 10 V/div Fig. 9 - Load Step Undershoot Response, IOUT = 0 A to 1.5 A, Time = 10 μs/div VOUT 100 mV/div ICOIL 2 A/div Fig. 12 - Load Step Overshoot Response, IOUT = 1.5 A to 0 A, Time = 10 μs/div VOUT 100 mV/div ICOIL 2 A/div LX 10 V/div LX 10 V/div Fig. 10 - Load Step Undershoot Response, IOUT = 0 A to 3 A, Time = 10 μs/div Fig. 13 - Load Step Overshoot Response, IOUT = 3 A to 0 A, Time = 10 μs/div EN 5 V/div EN 5 V/div VOUT 500 mV/div VOUT 500 mV/div ICOIL 1 A/div ICOIL 1 A/div LX 10 V/div LX 10 V/div Fig. 11 - Start-Up, IOUT = 0 A, Time = 1 μs/div S20-0484-Rev. C, 29-Jun-2020 Fig. 14 - Shut-Down, IOUT = 0 A, Time = 200 ms/div Document Number: 62973 7 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 SiP12117 www.vishay.com Vishay Siliconix EN 5 V/div EN 5 V/div VOUT 500 mV/div VOUT 500 mV/div ICOIL 2 A/div ICOIL 2 A/div LX 10 V/div LX 10 V/div Fig. 15 - Load Step Undershoot Response IOUT = 0 A to 3 A, Time = 1 ms/div VOUT 500 mV/div ICOIL 2 A/div LX 10 V/div Fig. 16 - Over Current Protection, IVALLEY = 4 A, Time = 100 μs/div S20-0484-Rev. C, 29-Jun-2020 Fig. 17 - Shut-Down, IOUT = 3 A, Time = 50 μs/div VOUT 500 mV/div ICOIL 2 A/div LX 10 V/div Fig. 18 - Over Current Protection, IVALLEY = 4 A, Time = 20 μs/div Document Number: 62973 8 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 SiP12117 www.vishay.com Vishay Siliconix OPERATIONAL DESCRIPTION Device Overview PWM Control Mechanism SiP12117 is a high efficiency monolithic synchronous buck regulator capable of delivering up to 3 A continuous current. The device has fixed switching frequency of 600 kHz. The control scheme is based on current - mode constant-on-time architecture, which delivers fast transient response and minimizes external components. Thanks to the internal current ramp information, no high ESR output bulk or virtual ESR network is required for the loop stability. SiP12117 has a full set of protection features: SiP12117 employs a state-of-the-art current - mode COT (CM-COT) control mechanism. During steady-state operation, output voltage is compared with internal reference (0.6 V typ.) and the amplified error signal (Vcomp) is generated. In the meantime, inductor valley current is sensed, and its slope (Isense) is converted into a voltage signal (Vcurrent) to be compared with Vcomp. Once Vcurrent is lower than Vcomp, a single shot on-time is generated for a fixed time set by an internal RON. • Cycle by cycle over current protection Light Load Operation • Over temperature protection with hysteresis To further improve efficiency at light-load condition, SiP12117 provides a set of innovative implementations to eliminate LS recirculating current and switching losses. The internal Zero Crossing Detector (ZCD) monitors LX node voltage to determine when inductor current starts to flow negatively. In light load operation as soon as inductor valley current crosses zero, the device first deploys diode emulation mode by turning off LS FET. If load further decreases, switching frequency is further reduced proportional to load condition to save switching losses while keeping output ripple within tolerance. The switching frequency is set by the control loop to maintain regulation. At zero load this frequency can go as low as hundreds of Hz. The device also features a dedicated enable pin for easy power sequencing and an open drain power good output. The device is available in 3 x 3 DFN10 package with an exposed power pad to deliver high power density with ease of use. Power Stage SiP12117 integrates a high performance power stage with an 85 m n-channel high side MOSFET and a 55 m n-channel low side MOSFET. The MOSFETs are optimized to achieve up to 95 % efficiency at 600 kHz switching frequency. Fig. 19 illustrates the basic block diagram for CM-COT architecture and fig. 20 demonstrates the basic operational principle: The power input voltage (VIN) can go up to 15 V and down as low as 4.5 V for power conversion. VOUT RON Bandgap Vref HG + OTA VIN VIN Vcomp HG Current mirror + Isense I-AMP - On-time generator + Control logic & MOSFET driver LG Vcurrent PWM comperator LS FET LG Fig. 19 - CM-COT Block Diagram Vcurrent Vcomp Fixed on-time PWM Fig. 20 - CM-COT Operational Principle S20-0484-Rev. C, 29-Jun-2020 Document Number: 62973 9 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 SiP12117 www.vishay.com Vishay Siliconix OUTPUT MONITORING AND PROTECTION FEATURES Output Over Current Protection (OCP) SiP12117 has cycle by cycle over current limit control. The inductor valley current is monitored during LS FET turn-on period through RDS(on) sensing. After a pre-defined blanking time, the valley current is compared with internal threshold (4.25 A typ.) to determine the threshold for OCP. If the monitored current is higher than the internal threshold, HS turn-on pulse is skipped and LS FET is kept on until the valley current returns below OCP limit. OCP is enabled immediately after VIN passes UVLO level and enable is high. In the figure below we see the ripple current riding on the DC load current. The valley current is calculated by taking one half the ripple current minus the DC load current. For example if IOUT = 3 A and ripple current = 1.2 A, IVALLEY = 3 A - 0.6 A = 2.4 A. The typical DC full load current would be 4.85 A which is calculated by 4.25 A (OCP typ.) + 0.6 A. Here we see changing the ripple current (inductor value) can change the maximum DC load current value. OCPthreshold Iload Iinductor GH Skipped GH pulse Fig. 21 - Over Current Protection Illustration Negative Current Protection Design Procedure Similar to the output over current protection, the negative current protection is realized by monitoring the current across the LS FET. When the valley point of the inductor current reaches -2.5 A for first cycles, both HS and LS FETs are off. The design process of the SiP12117 is quite straight forward. Only few passive components such as output capacitors and Inductor need to be selected. Over Temperature Protection (OTP) The following paragraph describes the selection procedure for these peripheral components for a given operating conditions. SiP12117 has internal thermal monitor block that turns off both HS and LS FETs when junction temperature is above 145 °C (typ.). A hysteresis of 35 °C is implemented, so when junction temperature drops below 110 °C, the device restarts by initiating soft-start sequence again. In the next example the following definitions apply: Soft Start There are two values of load current to evaluate - continuous load current and peak load current. SiP12117 has a built in soft-start function of ~2.9 ms. Once VIN is above UVLO level (2.8 V typ.), VOUT will ramp up slowly, rising monotonically to the programmed output voltage. Pre-bias Startup In case of pre-bias startup, the output is monitored through the FB pin. If the sensed voltage on FB is higher than the internal reference ramp value, control logic prevents HS and LS FET from switching to avoid a negative output voltage spike due to LS FET turn on.   VIN max.: the highest specified input voltage VIN min.: The minimum effective input voltage subject to voltage drops due to connectors, fuses, switches, and PCB traces. Continuous load current relates to thermal stress considerations which drive the selection of the inductor and input capacitors. Peak load current determines instantaneous component stresses and filtering requirements such as inductor saturation, output capacitors, and design of the current limit circuit. The following specifications are used in this design: • VIN = 12 V ± 10 % • VOUT = 1.2 V ± 1 % S20-0484-Rev. C, 29-Jun-2020 Document Number: 62973 10 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 SiP12117 www.vishay.com Vishay Siliconix Inductor Selection In order to determine the inductance, the ripple current must first be defined. Cost, PCB size, output ripple, and efficiency are all used in the selection process. Low inductor values result in smaller size and allow faster transient performance but create higher ripple current which can reduce efficiency. Higher inductor values will reduce the ripple current, and transient response. Efficiency especially at higher load currents will also be compromised due to the higher DCR (within a given case size). The ripple current also sets the boundary for power-save operation. The switching regulator will typically enter power-save mode when the load current decreases to 1/2 of the ripple current. For example, if ripple current is 1 A then power-save operation will typically start at loads approaching 0.5 A. Alternatively, if ripple current is set at 40 % of maximum load current, then power-save will start for loads less than ~20 % of maximum current. A smaller value of 1.5 μH is selected which is a standard value. This will increase the maximum ripple current by 25 %. Note that the inductor must be rated for the maximum DC load current plus 1/2 of the ripple current. The actual ripple current using the chosen 1 μH inductor comes out to be. Δi = (13.2 V - 1.2 V) x 151 ns 1.5 μH = 1.2 A Output Capacitance Calculation This table provides a simple easy guide for setting up the board. If excessive jitter is noticed then reducing the inductor to the next standard value may be needed. The output capacitance is usually chosen to meet transient requirements. A worst-case load release, from maximum load to no load at the exact moment when inductor current is at the peak, determines the required capacitance. If the load release is instantaneous (load changes from maximum to zero in < 1/fsw μs), the output capacitor must absorb all the inductor's stored energy. This will approximately cause a peak voltage on the capacitor according to the following equation. L x (IOUT + 1 x IRIPPLE max.)2 2 COUT min. = (VPEAK)2 - (VOUT)2 SiP12117 CONFIGURATION LOOK UP TABLE Assuming a peak voltage VPEAK of 1.3 V (100 mV rise upon load release), and a 3 A load release, the required capacitance is shown by the next equation. Setting the ripple current 20 % to 50 % of the maximum load current provides an optimal trade-off of the areas mentioned above. VIN (V) VOUT (V) INDUCTOR (μH) RFB_TOP () RFB_BOTTOM () 12 1 1.5 4.53K 6.81K 12 3.3 3.3 4.53K 1K 12 5 3.3 4.53K 619R 5 1 1.5 4.53K 6.81K 5 3.3 1.5 4.53K 1K  The equation for determining inductance is shown next. Example In this example, the inductor ripple current is set equal to 30 % of the maximum load current. Thus ripple current will be 30 % x 3 A or 0.9 A. To find the minimum inductance needed, use the VIN and tON values that correspond to VIN max.. L = (VIN - VOUT) x tON Δi 1.5 μH x (3 A + 0.5 x (1.2 A)2 COUT min. = (1.3 V)2 - (1.2 V)2 = 77.8 μF If the load release is relatively slow, the output capacitance can be reduced. Using MLCC ceramic capacitors we will use 3 x 22 μF or 66 μF as the total output capacitance. Switching Frequency Variations The switching frequency variation in COT can be mainly attributed to the increase in conduction losses as the load increases. Since the on time is constant the controller must account for losses and maintain output regulation by reducing the off time. Hence the fsw tends to increase with load. Plugging numbers into the above equation we get L = (13.2 V - 1.2 V) x 151 x 10-9 s 0.9 A = 2 μH   S20-0484-Rev. C, 29-Jun-2020 Document Number: 62973 11 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 SiP12117 www.vishay.com Vishay Siliconix LAYOUT CONSIDERATIONS The SiP12117 offers the designer a small part count, 3 A buck regulator solution. If the below layout recommendations are followed, the same layout can be used to cover a wide range of output currents and voltages without any changes to the board design and only minor changes to the component values in the schematic. The reference design has a majority of the components placed on the top layer. This allows for easy assembly and straightforward layout. Fig. 22 outlines the pointers for the layout considerations and the explanations follow. 9 7 2 VIN 8 0V 10 LX 1 6 5 3 4 11 VOUT 5 Fig. 22 - Reference Design Pointers 1. Place input ceramic capacitors close to the voltage input pins with a small 10 nF / 100 nF placed as close as the design rules will allow. This will help reduce the size of the input high frequency current loop and consequently reduce the high frequency ripple noise seen at the input and the LX node. S20-0484-Rev. C, 29-Jun-2020 2. Place the setup and control passive devices logically around the IC with the intention of placing a quiet ground plane beneath them on a secondary layer. 3. It is advisable to use ceramic capacitors at the output to reduce impedance. Place these as close to the IC PGND and output voltage node as design will allow. Place a small 10 nF / 100 nF ceramic capacitor closest to the IC and inductor loop. 4. The loop between LX, VOUT and the IC PGND should be as compact as possible. This will lower series resistance and also make the current loop smaller enabling the high frequency response of the output capacitors to take effect. 5. The output impedance should be small when high current is required; use high current traces, multiple layers can be used with many vias if the design allows. 6. Use many vias when multiple layers are involved. This will have the effect of lowering the resistance between layers and reducing the via inductance of the PCB nets. 7. The quiet AGND should be connected to the PGND plane near to the input GND at one connection only of at least 1 mm width. 8. PGND can be used on internal layers if the resistance of the PCB is to be small; this will also help remove heat. Use extra vias if needed but be mindful to allow a path between the vias. 9. A quiet plane should be employed for the AGND, this is placed under the small signal passives. This can be placed on multiple layers if needed for heat removal. 10. The LX copper can also be used on a single or multiple layers, use a number of vias to stitch the layers. 11. The copper area beneath the inductor has been removed (on all layers) in this design to reduce the inductive coupling that occurs between the inductor and the GND trace. No other voltage planes should be placed under this area. Document Number: 62973 12 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 SiP12117 www.vishay.com Vishay Siliconix PCB LAYOUT Fig. 23 - Top Layer Fig. 25 - Inner Layer 1 Fig. 24 - Inner Layer 2 Fig. 26 - Bottom Layer S20-0484-Rev. C, 29-Jun-2020 Document Number: 62973 13 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 SiP12117 www.vishay.com Vishay Siliconix SCHEMATIC U1 SiP12117 P1 1 2 R1 4.53 kΩ VIN 3 VIN BOOT Terminal EN 10 0V 1 2 P4 Header 2 PGD9 1 2 R6 0V Header 2 10 kΩ 0V C1 C2 C3 10 μF 10 μF 10 nF R5 1 kΩ LX EN LX 5V2 V CC C4 7 LX 100 nF L1 VOUT 3.3 μH C9 6 R3 4.53 kΩ C6 C7 C8 PGD 4 GND 5 GND GND P1 P3 8 BS R2 BS 1 20 Ω C5 VFB 1 VFB Omit R4 1 kΩ 10 nF 22 μF 22 μF P2 P5 1 2 1 2 Terminal Header 2 1 μF P6 1 2 0V Header 2 BILL OF MATERIAL (VIN = 12 V, VOUT = 3.3 V, FSW = 600 kHz) ITEM PCB FOOTPRINT QTY REFERENCE VALUE VOLTAGE PART NUMBER MANUFACTURER 1 2 C1, C2 1210 10 μF 35 V C1210C106M6PACTU Kemet 2 2 C3, C6 0402 10 nF 50 V GRM155R71H103KA88D Murata 3 1 C4 0603 1 μF 10 V C0402C105M8PACTU Kemet 4 1 C5 0402 100 nF 35 V CGA2B3X7R1V104K050BB Vishay 5 2 C7, C8 0805 22 μF 10 V CL21A226MPQNNNE Samsung 6 1 R2 0402 20R - CRCW040220R0FKED Vishay 7 1 R3 0402 4K53 - CRCW04024K53FKED Vishay 8 1 R4 0402 1K - CRCW0402249KFKED Vishay 9 1 L1 IHLP2525 3μ3 - IHLP2020BZER3R3M01 Vishay 10 1 U1 DFN10-3x3 - - SiP12117 Vishay 11 1 R1 0402 4K53 - CRCW04024K53FKED Vishay 12 1 R5 0402 1K - CRCW0402249KFKED Vishay 13 1 R6 0402 10K - CRCW040210K0FKED Vishay 14 4 P3, P4, P5, P6 HDR1x2 - - 90120-0126 Vishay 15 2 P1, P2 TERM2 - - 282834-2 TE Connectivity S20-0484-Rev. C, 29-Jun-2020 Document Number: 62973 14 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 SiP12117 www.vishay.com Vishay Siliconix PRODUCT SUMMARY Part number SiP12117 Description 3 A, 4.5 V to 15 V input, current mode constant on-time, synchronous buck regulator Input voltage min. (V) 4.5 Input voltage max. (V) 15 Output voltage min. (V) 0.6 Output voltage max. (V) 5.5 Continuous current (A) Switch frequency min. (kHz) 3 600 Switch frequency max. (kHz) 600 Pre-bias operation (yes / no) Yes Internal bias reg. (yes / no) Compensation No Integrated Enable (yes / no) Yes PGOOD (yes / no) Yes Overcurrent protection Protection Light load mode Peak efficiency (%) Package type Package size (W, L, H) (mm) Fixed OCP, OTP, UVLO Powersave 95 DFN10-33C 3 x 3 x 0.9 Status code 2 Product type microBUCK (step down regulator) Applications Computing, consumer, networking 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.vishay.com/ppg?69273. S20-0484-Rev. C, 29-Jun-2020 Document Number: 62973 15 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 Package Information Vishay Siliconix DFN-10 LEAD (3 X 3) D e Terminal Tip 3 D/2 3 NXb 0.10 M C A B 5 0.15 C E2 NXL Exposed Pad Index Area D/2 E/2 D2 0.15 5 BOTTOM VIEW // 0.10 E/2 ÉÉÉÉ ÉÉÉÉ ÉÉÉÉ ÉÉÉÉ 2x Index Area D/2 E/2 C E 2x TOP VIEW C A 4 NX 0.08 SEATING PLANE C A1 A3 SIDE VIEW MILLIMETERS NOTES: 1. All dimensions are in millimeters and inches. 2. N is the total number of terminals. 3. 4. 5. Dimension b applies to metallized terminal and is measured between 0.15 and 0.30 mm from terminal tip. Coplanarity applies to the exposed heat sink slug as well as the terminal. The pin #1 identifier may be either a mold or marked feature, it must be located within the zone iindicated. INCHES Dim Min Nom Max Min Nom Max A 0.80 0.90 1.00 0.031 0.035 0.039 A1 0.00 0.02 0.05 0.000 0.001 0.002 A3 b D D2 E E2 e L 0.20 BSC 0.18 0.23 0.008 BSC 0.30 0.007 2.48 0.087 3.00 BSC 2.20 2.38 1.64 0.40 0.094 0.098 0.118 BSC 1.74 0.059 0.50 BSC 0.30 0.012 0.118 BSC 3.00 BSC 1.49 0.009 0.065 0.069 0.020 BSC 0.50 0.012 0.016 0.020 *Use millimeters as the primary measurement. ECN: S-42134—Rev. A, 29-Nov-04 DWG: 5943 Document Number: 73181 29-Nov-04 www.vishay.com 1 Legal Disclaimer Notice www.vishay.com Vishay Disclaimer ALL PRODUCT, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE TO IMPROVE RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE. Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively, “Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained in any datasheet or in any other disclosure relating to any product. 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ALL RIGHTS RESERVED Revision: 09-Jul-2021 1 Document Number: 91000