SI3404-A-GM

Si3404 Data Sheet Fully-Integrated IEEE 802.3 Type 1-Compliant POE PD Interface and High-Efficiency Switching Regulator with Compact Footprint The Si3404 integrates the power management and control functions required in a Power-over-Ethernet (PoE) powered device (PD) application. These devices convert the high voltage supplied over the 10/100/1000BASE-T Ethernet connection to a regulated, low-voltage output supply. The optimized architecture of this device minimizes the solution footprint and external BOM cost and enables the use of low-cost external components while maintaining high performance. The Si3404 integrates a transient surge suppressor. The switching power FET and associated functions are also integrated. The integrated, current mode controlled switching regulator supports isolated or non-isolated flyback and buck converter topologies. The switching frequency for the regulator is tunable with a simple external resistor value to help avoid unwanted harmonics for better emissions control. This device fully supports the IEEE 802.3at specification for Type 1, single-event classification. Standard external resistors provide the proper IEEE 802.3 signatures for the detection function and programming of the classification mode, and internal startup circuits ensure well-controlled soft-start initial operation of both the hotswap switch and the voltage regulator. The Si3404 is available in a low-profile, 20-pin, 4 x 4 mm QFN package. KEY FEATURES • Type 1 (PoE) power • IEEE 802.3at Type 1 compliance • Current mode dc-dc converter • Tunable switching frequency • Transformer bias winding support • Auxiliary adapter capability • Integrated hotswap FET and switching FET • 120 V Absolute Max voltage performance • Extended –40 to +85 °C temperature • Compact ROHS-compliant 4 mm x 4 mm QFN Package APPLICATIONS • Voice over IP telephones • Wireless access points • Security and surveillance IP cameras • Point-of-sale terminals • Internet appliances • Network devices 1 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com Rev. 1.1 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 26, 2021 1 Si3404 Data Sheet • Ordering Guide 1. Ordering Guide Table 1.1. Si3404 Ordering Guide Ordering Part Number Si3404-A-GM 2 Package 4 x 4 mm 20-QFN Pb-free, RoHS-compliant Temperature Range (Ambient) Applications –40 to 85 °C Extended All Purposes Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com Rev. 1.1 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 26, 2021 2 Table of Contents 1. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2. System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.1 Block Diagram . . . . . . . . . . . . . . . . . . . . . 4 2.2 Power over Ethernet (PoE) Line-Side Interface 2.2.1 Surge Protection . . . . . . . . . 2.2.2 Telephony Protection . . . . . . . 2.2.3 Detection and Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.3 Hotswap Switch . . . . . . . . 4 4 4 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.4 HSSW State Machine . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.5 DC-DC Converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5.1 Average Current Sensing, Overcurrent, Low-Current Detection, and Output Short Protection . . 7 . 7 2.6 Tunable Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.7 Regulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.8 External Wall Adapter Support . . . . . . . . . . . . . . . . . . . . . . . . . 8 . . . . 3. Application Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . .11 5. Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.1 Detailed Pin Descriptions 6. Packaging . . . . . . . . . . . . . . . . . . . . . . . . 15 . .16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 6.1 Package Outline: Si3404 . . . . . . . . . . . . . . . . . . . . . . . . . .19 6.2 Land Pattern: Si3404 . . . . . . . . . . . . . . . . . . . . . . . . . . .21 7. Si3404 Top Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 8. Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com Rev. 1.1 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 26, 2021 3 3 . Si3404 Data Sheet • System Overview 2. System Overview The following Block Diagrams will give the designer a sense for the internal arrangement of functional blocks, plus their relationships to external pins. The Block Diagrams are followed by a description of the features of these integrated circuits. 2.1 Block Diagram RFREQ RDET VT15 VDD AUX WINDING SUPPORT VPOS IBIAS DETECTION TVS 100V 250kHz OSCs fixed: 250kHz adjustable: 100...500kHz PoE CONTROLLER THERMAL PROTECTION VPOS-1.32V FBH VSS+1.32V FBL Start 250kHz CLASS 5V REGULATOR THERMAL PROTECTION EROUT CURRENT MODE PWM CONTROLLER DC/DC SW SWO VSS HOT-SWAP CONTROLLER IAVG ISNS HSO HSSW VNEG RCL Figure 2.1. Si3404 Block Diagram 2.2 Power over Ethernet (PoE) Line-Side Interface The PoE line interface consists of external diode bridges, internal surge protection, and protocol interface support for detection and classification. The chip features active protection against surge transients and accidentally applied telephony voltages. 2.2.1 Surge Protection The surge protection circuit is activated if the VPOS-VNEG voltage exceeds VPROT and the hotswap switch is off (dc-dc is not powered). If the hotswap switch is on, the surge power is sunk in the dc-dc’s input capacitance. The internal surge protection can be overridden with an external TVS if higher than specified surge conditions need be tolerated. The external surge device must be connected in parallel to the internal one; therefore, the designer must ensure that the external surge protection will activate prior to the internal surge protection. 2.2.2 Telephony Protection The Si3404 provides protection against telephony ringing voltage. The telephony ringing is much longer than the surge pulse but it has less energy, therefore, the Si3404 has a switch parallel with the supply (between VPOS and VNEG). When the protection circuit is activated, it turns ON the protection switch; the ringing energy then dissipates on this switch and ringing generator resistance (> 400 Ω). 4 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com Rev. 1.1 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 26, 2021 4 Si3404 Data Sheet • System Overview 2.2.3 Detection and Classification When the Si3404 is connected via Ethernet cable to a PSE-enabled Ethernet switch, it has to provide a characteristic resistance (~25 kΩ) to the PSE in a given voltage range (2.7–10.1 V). This is called detection. After the PSE detects the PD, the PSE increases the voltage above the classification threshold 14.5 V. Then, the PD provides the classification current to inform the PSE about its required power class (Class 1, 2, 3, or 4). Type 1 PSEs cannot provide enough power for a Class 4 PD. Type 2 PSEs have additional voltage steps before switching on the PD. After an initial classification voltage pulse, the Type 2 PSE reduces the voltage below the mark threshold level (10 V) then raises it up again to the Class event range. Last, before switching ON the dc-dc, it reduces the voltage again. The Si3404 is a Type 1 PD. The following figure represents the typical turning ON procedure of the PD, which includes detection, classification and PD turn ON. Voltage 57 V 37 V IEEE 802.3af startup 37 V - 57 V (af) 20.5 V 14.5 V 10.1 V 2.7 V Time Reset Detection Classification PD turned ON Figure 2.2. Powered Device Voltages 2.3 Hotswap Switch The hotswap switch is a high voltage switch which separates the PoE inerface from the dc-dc converter domain. The internal hotswap switch (HSSW) is turned on (conducting) when the PoE interface voltage goes above VUVLO_R. It provides limited inrush current until the dc-dc side capacitor is charged. The hotswap switch turns off (open) if voltage on the HSSW switch is greater than VHSSW_OFF. In overload, the hotswap switch goes into current-limiting mode with a current limit of IOVL. It will turn back ON after TWAITHSSW elapses and the dc-dc input capacitor is recharged, meaning the HSO-VNEG voltage is less than VHSSW_ON. 5 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com Rev. 1.1 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 26, 2021 5 Si3404 Data Sheet • System Overview 2.4 HSSW State Machine The HSSW operates as simple 4-state state machine: 2 S3 S2 ON 3 INRUSH 1 170 mA S4 S1 5 5 4 OFF OVERLOAD 10 mA 5 Figure 2.3. Hotswap Switch 4-State Machine Transitions 1. UVLO released. 2. Input capacitor charged; PWM starts with Soft-Start protection. 3. Overcurrent detected; going to Overload state. 4. Overcurrent not present; going back to ON state. 5. Turning OFF the PD. OFF State HSSW turn-on is controlled by UVLO, the undervoltage lockout feature. When UVLO is engaged, the HSSW is OFF. In this state, the HSSW is in idle mode, VNEG and HSO pins are disconnected. In normal operation, a complete detect/classification procedure precedes the HSSW turn-on, and the control of this sequence is implemented in the state machine logic of the chip. INRUSH State After the controller enables the HSSW, the block starts operation in the INRUSH state. In this state the switch itself is not directly turned on, but operating in a closed-loop current limit mode to avoid high current peaks during the charging of the input capacitor of the dc-dc converter. If the VHSSW voltage drops below 380 mV (meaning the bypass cap is 99% charged), the HSSW will change state to ON. ON State In ON state, the HSSW switch is completely turned on. The HSSW circuit continuously monitors VHSSW. HSSW will change to OVERLOAD state if VHSSW voltage increases over 3.5 V. OVERLOAD State In OVERLOAD state the HSSW operates in closed-loop low current limit mode. If the VHSSW voltage drops below 380 mV again, and the HSSW has been in the OVERLOAD state for at least TWAITHSSW, the HSSW will change back to the ON state. 6 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com Rev. 1.1 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 26, 2021 6 Si3404 Data Sheet • System Overview 2.5 DC-DC Converter The dc-dc converter is current-controlled for easier compensation and more robust protection of circuit magnetics. The controller has the following features: • High- and low-side error amplifier (supports Buck and Flyback topologies). • 681 Ω) 0 — 4 mA Class 1 (RCLASS = 140 Ω @ 1%) 9 — 12 mA Class 2 (RCLASS = 75 Ω @ 1%) 17 — 20 mA Class 3 (RCLASS = 48.7 Ω @ 1%) 26 — 30 mA PoE PROTOCOL Detection VDET Classification VRESET VCLASS IPortCLASS V Power On and UVLO VUVLO_R Hotswap closed and converter on 34 37 40 V VUVLO_F Hotswap open and converter off 30 32 34 V 3.5 4.5 6 V VUVLO_HYST Thermal Characteristics Tshd Thermal shutdown — 160 — °C THYST Thermal shutdown hysteresis — 20 — °C TVS protection activation voltage (VPOS-VNEG) 100 — — V Iinrush Inrush current 100 170 200 mA IMAXHSSW Maximum continuous operating current — — 600 mA VHSSW_ON Switch ON voltage — 380 — mV VHSSW_OFF Switch OFF voltage, HSSW goes to overload cycle — 3.5 — V IOVL Switch current limit in OVERLOAD State — 10.5 — mA TWAITHSSW Wait time in OVERLOAD 80 96 116 ms RONHSSW Internal hotswap drain-source resistance while ON 0.65 1.5 2.9 Ω On-Chip Transient Voltage Suppression/Protection VPROT Hotswap Switch DC-DC 13 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com Rev. 1.1 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 26, 2021 13 Si3404 Data Sheet • Electrical Specifications Symbol Parameter (Condition) Min Typ Max Unit ISWOPEAK Peak current limit of internal FET (SWO pin) 2.1 — 2.7 A FOSCINT Using internal Oscillator 215 250 290 kHz Using external Oscillator, RFREQ = 215 kΩ 75 95 115 kHz Using external Oscillator, RFREQ = 39 kΩ 420 470 520 kHz DUC Output duty cycle of PWM — — 75 % VFBREF FBH (referenced to VPOS) and FBL (referenced to VSS) reference voltage 1.28 1.32 1.36 V VEROUT Operating voltage range of error input 1 — 4 V — 1 — ms FOSCEXT THICCUP Output short protection if EROUT is max VISNS_OVC Overcurrent limit voltage on ISNS (ref. to VSS) –305 –270 –255 mV TSOFTSTART Startup time1 — 15 — ms RONDCDC Internal dc-dc switching FET drainsource resistance while ON — 0.9 1.2 Ω Regulators VT15 Override internal regulator with transformer winding 12.5 — 16.5 V VDD 5 V regulated output 4.9 5.2 5.5 V VDDILIM dc current limit of VDD 9.7 11.2 — mA CREG Filter capacitor on VDD 82 100 220 nF PINTMAX dc-dc max power internal FET — 0.5 0.9 W IPortOP Operating current (VPORT 57 V; 250 kHz) — 3 5 mA — 46.8 — C°/W Power Dissipation Package Thermal Characteristics θJA-EFF QFN202 Note: 1. Depends on output load. 2. Assumes 4-Layer PCB with adequate layout. 14 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com Rev. 1.1 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 26, 2021 14 Si3404 Data Sheet • Pin Descriptions NC VSS SWO NC VT15 5. Pin Descriptions 20 19 18 17 16 ISNS 1 15 NC FBH 2 14 NC VNEG (ePad) EROUT 3 13 VPOS 6 7 8 9 10 RCL RFREQ 11 NC HSO VDD 5 NC 12 NC RDET FBL 4 Figure 5.1. Si3404 Pinout Table 5.1. Pin Descriptions Si3404 Pins Name Ref Dir. Vrange 1 ISNS VSS I –0.5 to 0 2 FBH VPOS I 0–5.5 High side (VPOS referred) dc-dc feedback (Buck converter) 3 EROUT VSS IO 0–5.5 Error amplifier current output, compensation impedance input 4 FBL VSS I 0–5.5 Low side (VSS referenced) dc-dc feedback (Flyback converter) 5 VDD VSS O 0–5.5 5 V regulator output 6 RDET VPOS IO 0–100 Detection resistor 8 HSO VNEG IO 0–100 Hotswap switch output 9 RCL VNEG IO 0–5.5 Classification resistor 10 RFREQ VPOS IO 0–5.5 Oscillator frequency tuning resistor, tie to VPOS to select default frequency 13 VPOS — IO 0–100 Rectified high-voltage supply positive rail 16 VT15 VSS I 0–16.5 dc-dc transformer auxiliary winding input 18 SWO VSS O 0–120 Internal dc-dc switch output (NMOS drain) 19 VSS — IO 0 dc-dc converter primary ground ePad VNEG — IO 0 Rectified high voltage supply ground 7, 11, 12, 14, 15, 17, 20 NC — — — Connect to VNEG for better thermal performance 15 Description Chip current sense resistor input Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com Rev. 1.1 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 26, 2021 15 Si3404 Data Sheet • Pin Descriptions 5.1 Detailed Pin Descriptions Table 5.2. Circuit Equivalent and Description of Die Pads Pin Name Detailed Description Circuit Detail VSS ISNS Average current sense resistor input. The resistor value will set the maximum allowed current for the application. The overcurrent threshold voltage VISNS_OVC. Note that this pin voltage goes below VSS. ISNS VPOS FBH High side dc-dc feedback input. Need to be tied to VPOS when not used. See VFBREF. FBH VDD dc-dc converter error output; current out, voltage sense. Loop compensating impedance should be connected here. EROUT EROUT IEROUT = (VFBH – VFBREF) x 50 μA or IEROUT = (VFBL – VFBREF) x 50 μA VSS VDD FBL Low side dc-dc feedback input. Need to be tied to VSS when not used. See VFBREF FBL VSS VDD VDD Regulated 5 V relative to VSS. There is no foldback characteristic, reaching VDDILIM the output voltage decreases. The regulator needs CREG external capacitance. VSS 16 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com Rev. 1.1 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 26, 2021 16 Si3404 Data Sheet • Pin Descriptions Pin Name Detailed Description Circuit Detail ICLASS RCL Classification resistor input. For class 0 this pin can be left floating. Pin is active only at time of classification. RCL + - REXT VNEG VPOS Used for adjusting the oscillator frequency. RFREQ The frequency is inversely proportional to the value of the connected resistor. REXT + - RFREQ IFREQ VPOS VPOS, VNEG Main chip input power. Note that VNEG (the ePad on the bottom of the chip) also provides thermal relief. VNEG HSO HSO Hotswap Switch Output. The switch shorts the VNEG and HSO pins, and includes several other functions. See hotswap switch section for details. 120V VNEG VPOS RDET The user has to tie the RDET resistor between this pin and VPOS. During detection, a high voltage switch pulls down RDET to VNEG. After detection, the reference block uses RDET as absolute chip current reference, forcing –750 mV relative to VPOS, creating 30 µA for the internal blocks. 120V RDET RDET 120V VNEG 17 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com Rev. 1.1 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 26, 2021 17 Si3404 Data Sheet • Pin Descriptions Pin Name Detailed Description Circuit Detail VPOS VT15 VT15 VT15 is input for an optional 15 V supply generated by an auxiliary transformer bias winding. If the bias winding voltage is lower than VT15_MIN, the internal 15 V coarse regulator will provide the current for the 11 V regulator. V11 is not available on the Si3404 but is included to show internal connections. 6V V11 6V 6V VSS SWO SWO dc-dc converter switching transistor drain output, Vmax = 120 V. VSS VPOS VSS dc-dc converter ground. 120V ESD CLAMP VSS 18 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com Rev. 1.1 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 26, 2021 18 Si3404 Data Sheet • Packaging 6. Packaging 6.1 Package Outline: Si3404 The figure below illustrates the package details for the Si3404. The table lists the values for the dimensions shown in the illustration. Figure 6.1. 20-Pin, QFN Package 19 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com Rev. 1.1 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 26, 2021 19 Si3404 Data Sheet • Packaging Table 6.1. Package Diagram Dimensions Dimension Min Nom Max A 0.80 0.85 0.90 A1 0.00 0.02 0.05 b 0.18 0.25 0.30 D D2 4.00 BSC. 2.55 2.60 e 0.50 BSC. E 4.00 BSC. 2.65 E2 2.50 2.60 2.70 L 0.30 0.40 0.50 aaa — — 0.10 bbb — — 0.10 ccc — — 0.08 ddd — — 0.10 eee — — 0.10 Note: 1. All dimensions shown are in millimeters (mm) unless otherwise noted. 2. Dimensioning and Tolerancing per ANSI Y14.5M-1994. 3. This drawing conforms to the JEDEC Solid State Outline MO-220, Variation VGGD-8. 4. Recommended card reflow profile is per the JEDEC/IPC J-STD-020 specification for Small Body Components. 20 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com Rev. 1.1 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 26, 2021 20 Si3404 Data Sheet • Packaging 6.2 Land Pattern: Si3404 The figure below illustrates the land pattern details for the Si3404. The table lists the values for the dimensions shown in the illustration. Figure 6.2. 20-Pin, QFN Land Pattern 21 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com Rev. 1.1 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 26, 2021 21 Si3404 Data Sheet • Packaging Table 6.2. Land Pattern Dimensions Dimension Min Max C1 3.90 4.00 C2 3.90 4.00 E 0.50 BSC X1 0.20 0.30 X2 2.55 2.65 Y1 0.65 0.75 Y2 2.55 2.65 Note: General 1. All dimensions shown are in millimeters (mm) unless otherwise noted. 2. This land pattern design is based on the IPC-7351 guidelines. Solder Mask Design 1. All metal pads are to be non-solder mask defined (NSMD). Clearance between the solder mask and the metal pad is to be 60 µm minimum, all the way around the pad. Stencil Design 1. A stainless steel, laser-cut and electro-polished stencil with trapezoidal walls should be used to assure good solder paste release. 2. The stencil thickness should be 0.125 mm (5 mils). 3. The ratio of stencil aperture to land pad size should be 1:1 for all perimeter pads. 4. A 2x2 array of 1.10 mm x 1.10 mm openings on 1.30 mm pitch should be used for the center ground pad. Card Assembly 1. A No-Clean, Type-3 solder paste is recommended. 2. The recommended card reflow profile is per the JEDEC/IPC J-STD-020 specification for Small Body Components. 22 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com Rev. 1.1 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 26, 2021 22 Si3404 Data Sheet • Si3404 Top Marking 7. Si3404 Top Marking Figure 7.1. Si3404 Top Marking Table 7.1. Si3404 Top Marking Explanation Mark Method: Laser Pin 1 Mark: Circle = 0.50 mm Diameter (Lower-Left Corner) Font Size: 0.6 Point (24 mils) Line 1 Mark Format: Device Part Number Si3404 Line 2 Mark Format: TTTTTT Trace code from the Assembly Purchase Order form Line 3 Mark Format: YY = Year Assembly Year WW = Work Week Assembly Week 23 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com Rev. 1.1 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 26, 2021 23 Si3404 Data Sheet • Revision History 8. Revision History Revision 1.1 October, 2021 • Updated Figure 2.4 Si3404 DC-DC Converter Block Diagram on page 7. • Updated Table 6.2 Land Pattern Dimensions on page 22. • Updated Solder Mask Design spec. Revision 1.0 July, 2018 • Updated Figure 2.2 Powered Device Voltages on page 5. • Removed Type 2 signaling from diagram. • Updated Figure 2.3 Hotswap Switch 4-State Machine on page 6. • Clearer state transition diagram and improved transition descriptions. • Updated 2.5.1 Average Current Sensing, Overcurrent, Low-Current Detection, and Output Short Protection. • Added information on output short protection. • Updated Table 4.1 Absolute Maximum Ratings1 on page 11. • Added min and max current for VPOS. • Added note about internal surge protection. • Updated Table 4.2 Recommended Operating Conditions on page 12. • Added VPOS to IAVG spec; changed IPEAK to IMAX, and removed SWO and VSS from specification. • Updated Table 4.3 Electrical Characteristics on page 13. • Updated VDET spec to include low threshold and high threshold specs. • Updated classification reset max voltage (VRESET) based on final characterization data. • Updated classification voltage VCLASS based on final characterization data. • Added max and min VUVLO_R, VUVLO_F, and VUVLO_HYST max and min voltages. • Removed IOVL max and min current. • Added min and max frequency to FOSCINT based on final characterization data. • Removed “TBD” from DUC spec. • Added max and min VFBREF voltage. • Added THICCUP typical spec. • Added max and min VISNS_OVC voltage. • Updated TSOFTSTART time based on application data and added note about dependence on output load. • Updated min VT15 based on characterization data. • Updated VDD min, typ, and max based on final characterization data. • Added VDDILIM max voltage. • Added min and max CREG capacitance. • Updated PINTMAX based on final characterization data. • Removed PMAX spec. • Updated IPORTOP max current based on final characterization data. • Updated Table 5.1 Pin Descriptions on page 15. • Updated Vrange. • Updated Table 5.2 Circuit Equivalent and Description of Die Pads on page 16. • Added detail to VT15 pin description. 24 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com Rev. 1.1 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 26, 2021 24 Si3404 Data Sheet • Revision History Revision 0.5 February, 2018 • Updated 2. System Overview and 3. Application Examples. • Added theory of operation and application content. • Updated Table 4.1 Absolute Maximum Ratings1 on page 11, Table 4.2 Recommended Operating Conditions on page 12, and Table 4.3 Electrical Characteristics on page 13. • Clarified multiple parameters. • Added 5.1 Detailed Pin Descriptions. • Added 6. Packaging including outline and land pattern. Revision 0.1 March, 2017 • Initial release. 25 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com Rev. 1.1 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 26, 2021 25 Connecting Everyone and Everything, All the Time Portfolio Quality Support & Resources www.skyworksinc.com www.skyworksinc.com/quality www.skyworksinc.com/support Copyright © 2021 Skyworks Solutions, Inc. All Rights Reserved. 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