전력 관리
하위 카테고리
제품 (2819)
TPS22991ICNRAAR - 2.7A, 28mΩ Load Switch | TI
The Texas Instruments TPS22991ICNRAAR is a single-channel N-channel load switch rated 2.7A continuous current with a 28 mΩ on-resistance, operating from a 1.0V to 5.5V input range over a -55°C to +125°C junction temperature range, housed in a 4-pin UQFN-HR package measuring just 0.85 mm x 0.75 mm with 0.4 mm pitch. A load switch is a power management IC that sits between a power rail and its load, acting as an electronically controlled switch. In the system hierarchy, a load switch is a type of power distribution switch, itself a subcategory of power MOSFET driver / power management IC. Load switches allow processors, PMICs, or logic circuits to connect and disconnect sub-system power rails, control power-up sequencing, and limit inrush current during capacitor charging at turn-on. Key features of the TPS22991I family include the extremely small plastic 4-pin UQFN package, controlled slew rate during turn-on that limits inrush current, low shutdown leakage current that preserves battery life in portable designs, and an on/off input (EN) capable of interfacing directly with low-voltage GPIO control signals. The switch element is an N-channel MOSFET that supports a maximum continuous current of 2.7A in this variant. Technically, the device integrates the N-channel pass MOSFET, its charge-pump-style gate drive, and slew-rate control circuitry into the tiny 0.85 mm x 0.75 mm footprint. The controlled rise time avoids the voltage droop and ringing that occur when an uncontrolled switch charges large downstream capacitance. The low shutdown leakage specification is particularly valuable in always-on and battery-backed designs where even microamps matter. Typical applications include power-rail gating in smartphones, tablets and wearables, peripheral power switching in industrial sensors and IoT modules, battery disconnect functions in portable instruments, and power sequencing for processors, RF front ends and displays. The -55°C to +125°C range supports aerospace and extreme-environment industrial designs. A key design consideration: the 4-pin UQFN-HR pinout is not the generic IN-OUT-GND-EN arrangement used by most small load switches, so designers must verify the specific pin assignment in the manufacturer datasheet before drop-in substitution; TI's E2E forum has documented this special pinout. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
TPS22992 - 5.5V 6A 8.7mΩ Load Switch | Texas Instruments
The Texas Instruments TPS22992 is a single-channel load switch with an integrated 8.7 mΩ power MOSFET designed to maximize power density in applications up to 5.5 V input and 6 A continuous output current, housed in an 8-pin WQFN-HR (1.5 mm x 1.25 mm) package. A load switch is a power management IC that sits between a power rail and its load, using an internal MOSFET pass element and control logic to connect or disconnect the load on demand. Load switches occupy the middle of the power management IC hierarchy, below full DC-DC converters and above discrete MOSFET solutions, providing controlled power-up, inrush limiting, rail sequencing, and fault isolation that a bare MOSFET cannot deliver without significant external circuitry. Key features of the TPS22992 include the ultra-low 8.7 mΩ on-resistance, which limits conduction losses to roughly 78 mW at a full 6 A load, an input voltage range up to 5.5 V, and a configurable rise time that gives designers flexibility for power sequencing. The adjustable rise time also minimizes inrush current when switching high-capacitance loads such as large ceramic capacitor banks or downstream SoC core rails. Technically, the TPS22992 uses an N-channel high-side power MOSFET driven by an internal charge-pump gate driver, which allows the switch to achieve extremely low Ron without the voltage-drop penalty of a P-channel device. The TPS22992x family consists of two members: the TPS22992 and the TPS22992S, which differ in their output discharge behavior, letting designers choose whether the output rail floats or is actively pulled low when the switch is disabled. Typical applications include powering processor cores and I/O rails in servers and SSDs, peripheral port power control in industrial systems, and general 5V-rail power distribution where a compact 6 A switch replaces discrete MOSFET-plus-driver solutions. When designing with the TPS22992, account for thermal rise at sustained high load: at 6 A, I2R losses through the 8.7 mΩ switch demand a solid ground-plane copper pour under the WQFN-HR thermal pad to keep junction temperature within limits. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
TPS22995RZFR - 3.8A, 18mΩ Load Switch | TI | Power Distribution
The Texas Instruments TPS22995RZFR is a single-channel N-channel load switch with a maximum continuous current of 3.8 A, a typical on-resistance of 18 mΩ, and an input operating voltage range of 0.4 V to 5.5 V, housed in a 6-pin WQFN-HR (RZF) package measuring 1.25 mm x 0.85 mm. A load switch is a power management IC that sits between a power rail and its load, using an internal MOSFET pass element to connect or disconnect the rail under logic control. Within the power management hierarchy (load switch -> power distribution switch -> power management IC), load switches handle controlled power sequencing, inrush limiting, and rail isolation in systems where a simple regulator cannot provide on/off control. The TPS22995 belongs to this load switch category and is optimized for low on-resistance and configurable startup behavior. Key features include the 0.4 V to 5.5 V VIN range, a VBIAS supply range of 1.5 V to 5.5 V that keeps the internal gate drive strong even when VIN is very low, and adjustable slew rate control through an external capacitor on the CT pin. The adjustable rise time minimizes inrush current when charging large bulk capacitance, and the device provides overtemperature protection. An active-high ON pin enables straightforward GPIO interfacing. Technically, the TPS22995 uses an N-channel MOSFET pass element with an internal charge-pump-derived gate drive supplied by VBIAS. This architecture delivers 18 mΩ typical on-resistance while maintaining low dropout at 3.8 A loads, and the RC-programmable CT pin allows designers to trade startup time against inrush current precisely. Typical applications include powering core rails of processors and FPGAs, peripheral rail switches in smartphones and tablets, SSD and storage subsystem power sequencing, and battery-powered portable devices where controlled power-up extends battery life. A key design consideration: choose the CT capacitor value so the 10%-90% rise time is long enough to limit inrush below the 3.8 A maximum continuous current when switching large capacitive loads. Oversizing the capacitor unnecessarily slows rail bring-up during power sequencing. This page synthesizes distributor pricing, drop-in alternative data, and practical design notes not found in the manufacturer datasheet alone.
TPS22995RZGR - 3.8A, 5.5V Load Switch 18mΩ | TI
The Texas Instruments TPS22995RZGR is a single-channel N-channel high-side load switch with a maximum continuous current of 3.8 A, a typical on-resistance of 18 mΩ, and an input operating voltage range of 0.4 V to 5.5 V, housed in a 6-pin WQFN-HR (RZG) package measuring just 1.5 mm x 0.75 mm. A load switch is a type of power distribution switch, which itself sits within the broader power management IC hierarchy. Load switches use an integrated MOSFET pass element controlled by a logic input to connect or disconnect a power rail from its load, enabling power sequencing, rail gating, and inrush-current control in multi-rail systems. The TPS22995 implements this function with a low-resistance N-channel MOSFET that reduces dropout voltage for low-voltage, high-current rails. Key features include the 0.4 V to 5.5 V VIN range, a separate bias supply (VBIAS) operating from 1.5 V to 5.5 V that fully enhances the N-channel MOSFET even at very low input voltages, and adjustable output slew-rate control through an external capacitor on the CT pin. The adjustable rise time enables precise power-on sequencing and limits inrush current during startup, protecting upstream regulators and connectors. Technically, the device achieves its 18 mΩ typical on-resistance by driving the N-channel pass transistor gate above the input rail using the bias supply. This architecture yields very low voltage drop at multi-ampere loads, minimizing power loss (I²R) and thermal stress. Typical on-resistance keeps dissipation low: at 3.8 A the conduction loss is only about 0.26 W (Estimated: I²R = 3.8² x 0.018). Typical applications include power rail gating in battery-powered portable electronics, SSD and storage peripherals, micro-IoT hardware with limited PCB real estate, and industrial point-of-load distribution where a small, low-loss switch is required. When designing with this device, always provide the VBIAS supply (1.5 V to 5.5 V) with local decoupling, and size the CT capacitor to set the rise time appropriate for the load capacitance to control inrush current. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
TPS22996H-Q1 - 5.5V 4A Dual Load Switch | TI Automotive
The Texas Instruments TPS22996H-Q1 is a dual-channel load switch with controlled turn-on, containing two N-channel MOSFETs rated for 0.6 V to 5.5 V input voltage, 13 mOhm typical on-resistance, and 4 A maximum continuous current per channel, housed in a 2.1 mm x 1.2 mm 8-pin DYC (SOT-583) package. A load switch is a power management IC that sits between a supply rail and its load, using an internal MOSFET to connect or disconnect power under the control of a logic signal. Within the power-management hierarchy (load switch -> power distribution switch -> power management IC -> semiconductor), load switches add controlled slew rates, fault protection, and rail sequencing that a bare MOSFET cannot provide, making them essential building blocks in multi-rail electronic systems. Key features include the 13 mOhm typical RON, which minimizes voltage drop and conduction loss at the full 4 A per channel load, independently controlled ON1 and ON2 GPIO-compatible inputs that let a microcontroller sequence each rail separately, and controlled turn-on that limits inrush current when charging large downstream capacitance. The device is AEC-Q100 qualified for automotive use and characterized over -40 C to +125 C. Technically, the TPS22996H-Q1 integrates the power MOSFET, driver, and control logic in one die, reducing BOM count versus discrete solutions. Per TI documentation, the pins are humidity-robust and able to function with a 100 kOhm short from any pin to GND or power, improving reliability in harsh automotive environments. Typical applications include automotive infotainment and cluster power distribution, ADAS module periphery-rail switching, telecom line-card power sequencing, and industrial PLC I/O rail control, where low RON and dual independent channels save board space. Design consideration: at 4 A per channel, PCB copper area under the small DYC package determines thermal rise; verify junction temperature with your actual duty cycle and both-channel loading. This page synthesizes distributor pricing context, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet.
TPS22997QRYZRQ1 - 10A, 5.5V Load Switch | Texas Instruments
The Texas Instruments TPS22997QRYZRQ1 is an AEC-Q100 qualified single-channel automotive load switch delivering up to 10A continuous current over an input voltage range of 0.1V to 5.5V, with a bias supply of 1.5V to 5.5V. It integrates an N-channel MOSFET with a typical on-resistance of only 4 mΩ in a compact 10-pin WQFN-HR (RYZ) package measuring just 1.5 mm x 2 mm. A load switch is a power management IC that gates a power rail on and off using an integrated MOSFET controlled by a logic-level enable pin. In the power management hierarchy, load switches sit between the power source (a DC-DC converter or LDO) and the load, providing controlled power-up sequencing, inrush limiting, rail isolation, and fault protection that raw converters do not offer. Key features include adjustable slew-rate control to minimize inrush current during turn-on, an adjustable quick output discharge (QOD) pin that actively pulls the output low when disabled, and a power-good output for rail monitoring and sequencing. The ON pin can interface directly with low-voltage GPIO signals. Thermal shutdown and low quiescent power consumption round out the feature set. Technically, the 4 mΩ RON translates to only 40 mV of drop at 10A and just 0.4W of conduction loss, eliminating the need for a heatsink. The configurable rise time allows designers to trade startup time against inrush current to protect upstream regulators and downstream capacitors. Typical applications include automotive ADAS processor and FPGA power sequencing, infotainment rail gating, sensor module power control, and battery-connected load management in 5V and sub-5V systems. The Q1 qualification supports all AEC-Q100 automotive ambient temperature grades. Design tip: use the CT pin capacitor to set slew rate so that inrush into large downstream bulk capacitance stays within the upstream supply current limit, and verify bias voltage is present before asserting ON.
TPS22997RYZR - 5.5V 10A 4mOhm Load Switch | Texas Instruments
The Texas Instruments TPS22997RYZR is a single-channel load switch with an integrated N-channel MOSFET, operating over an input voltage range of 0.1 V to 5.5 V and supporting a maximum continuous current of 10 A, with a typical on-resistance of 4 mOhm. It is housed in a compact 10-WQFN-HR (1.5x2 mm) package designed for space-constrained, high-current power distribution. A load switch is a semiconductor device that connects or disconnects a power supply rail from a load, functioning as an electronic switch. It typically integrates a pass MOSFET, gate-drive control logic, and protection features such as thermal shutdown and inrush management. Load switches sit within the power management IC hierarchy alongside hot-swap controllers and eFuses, and are essential for power gating, rail sequencing, and protection in systems from smartphones to industrial equipment. Key features include adjustable slew rate control to minimize inrush current during turn-on, adjustable quick output discharge (QOD) for rapid discharge of output capacitance, and a power good (PG) signal for rail monitoring. The enable pin (ON) interfaces directly with low-voltage GPIO signals, and the device offers thermal shutdown protection and low power consumption. The bias voltage range of 1.5 V to 5.5 V ensures compatibility with standard logic levels in mixed-voltage systems. Technically, the TPS22997 integrates a very low on-resistance N-channel MOSFET, achieving 4 mOhm typical RON, which minimizes voltage drop and conduction loss - critical at 10 A loads where even milliohms matter (4 mOhm x 10 A = 40 mV drop and 0.4 W dissipation). The configurable rise time allows designers to tailor inrush current to upstream supply capability and load capacitance, reducing supply droop and board stress. Typical applications include power distribution in SSDs, smartphones, tablets, and other portable and battery-powered devices, as well as hot-swap and load-switching functions in industrial systems. The low RON and high current capability suit high-current low-voltage rails, while the tiny 1.5x2 mm footprint saves board space. When designing with the TPS22997, provide adequate PCB copper area for thermal dissipation at full 10 A load, place decoupling capacitors close to VIN and VBIAS, and set the slew rate to balance inrush current against turn-on delay for the specific load capacitance.
TPS23521 - -10V to -80V Hot Swap Controller | Texas Instruments
The Texas Instruments TPS23521 is a high-performance hot swap controller for -10V to -80V telecom power systems, integrating dual current limit and dual gate drive in a 16-pin TSSOP (PWT/PWR) package. It enables safe board insertion and removal from live -48V backplanes, serving network routers, switches, and other high-power telecom equipment. A hot swap controller is a power management IC that safely connects and disconnects a load from a live power bus, limiting inrush current and preventing connector arcing and system glitches. It works with an external pass MOSFET, current sensing, and gate control, and belongs to the broader power management IC hierarchy alongside e-fuses and hot swap controllers. Key features include a 200V absolute maximum rating for survivability during lightning surge tests per IEC61000-4-5, dual current limit with dual gate drive for independent control of two MOSFETs, and a soft start capacitor disconnect function that enables soft start at power-up while improving transient response in normal operation. The device operates over -40C to +85C and is RoHS compliant. The TPS23521 uses a proprietary architecture providing precise current sensing and fast response to overcurrent faults. Its high-voltage capability and robust design make it well suited for harsh telecom environments with -48V battery plants, where input transients from lightning surge and hot swapping are common design challenges. Typical applications include -48V hot swap in telecom rectifiers, network routers, Ethernet switches, and base station power distribution. With appropriate external MOSFETs, the dual gate drive supports high-current designs up to several hundred amps. Design tip: choose the soft start capacitor to limit inrush current to safe MOSFET SOA levels, and provide low-inductance, thermally adequate PCB paths for the external pass devices. Pricing varies by package suffix and quantity; refer to authorized distributors for current stock and pricing as of 2026-08-30.
TPS2370D - IEEE 802.3af PoE Power Interface Switch | TI
Texas Instruments TPS2370D is an IEEE 802.3af Power-over-Ethernet power interface switch for powered devices, presented in an 8-pin SOIC package. It integrates the input protection and power-signaling functions needed to connect a PoE powered device to compliant Ethernet infrastructure. The device is intended for 12.5 W-class PoE systems and helps separate the low-power Ethernet data path from the higher-voltage power path before downstream DC/DC conversion. A PoE power interface switch is the bridge between an Ethernet cable and a powered-device power supply. Ethernet carries data and power on the same cable, so the powered device must identify the available power source, control the connection, and protect the interface before accepting power. The TPS2370D is designed around IEEE 802.3af-compatible PoE powered-device behavior and is suitable for IP phones, wireless access points, surveillance equipment, and other network peripherals. The manufacturer product page identifies TPS2370 as an IEEE 802.3af power interface switch for PoE powered devices. Distributor listings identify TPS2370D as an 8-SOIC device. The verified data does not provide a complete electrical table, so ratings such as input voltage range, current limit, channel timing, protection thresholds, and temperature limits must be taken directly from the manufacturer datasheet before final design release. Those unprovided values are intentionally not inferred here. The TPS2370D belongs to the PoE interface-controller category, which sits between Ethernet connectivity and downstream power management. It is not a general-purpose voltage regulator or a DC/DC converter. A typical design uses the device at the Ethernet connector or PoE input, then passes the selected power to a DC/DC converter that creates the low-voltage rails required by the powered device. For a new PoE design, verify connector pinout, cable polarity protection, isolation requirements, thermal performance, and the IEEE 802.3af power-class limits against the current TI documentation. The D suffix denotes the verified 8-SOIC ordering variant, while package-specific land patterns and exposed-pad details must be confirmed from the package drawing rather than inferred from generic SOIC drawings. This product page consolidates the verified manufacturer identification, package information, distributor data, and cross-reference findings. It deliberately distinguishes confirmed facts from parameters requiring the datasheet, which helps engineers evaluate sourcing without treating unverified electrical claims as design data.
TPS2370DR - IEEE 802.3af PoE Power Interface Switch | Texas Instruments
The Texas Instruments TPS2370DR is an IEEE 802.3af power interface switch for Power over Ethernet powered devices, supplied in an 8-pin SOIC package. The verified listing identifies its role as a PoE power-interface switch, while the available data does not specify its operating voltage, current, protection thresholds, temperature range, or exact electrical limits. A PoE power interface switch is the component that connects a powered device to the power delivered through an Ethernet cable. It sits in the power path after cable-side network isolation and helps a powered device receive or reject power according to the Ethernet PoE system. In this product family, the TPS2370 is specifically identified as an IEEE 802.3af power interface switch for PoE powered devices. The principal verified feature is IEEE 802.3af compatibility. This standard is associated with 10/100/1000BASE-T Ethernet applications and defines the framework for supplying power over standard Ethernet cabling. The TPS2370DR therefore targets networking equipment that needs a dedicated PoE interface rather than a general-purpose voltage regulator or conventional power switch. The TPS2370DR uses Texas Instruments’ DR package designation, identified in the supplied results as an 8-SOIC or SOP8 package. Surface-mount construction supports compact PCB layouts, while the eight-pin package leaves the device easy to inspect and replace during manufacturing. The verified distributor information also classifies it as a specialized interface IC and power-supply support circuit. Typical application areas include PoE-powered network cameras, VoIP phones, wireless access points, Ethernet switches, and other powered devices connected through Ethernet infrastructure. The exact power budget, current handling, protection behavior, and thermal performance must be confirmed from the manufacturer datasheet before final circuit design. This page preserves the verified product identity and distinguishes it from functionally similar, but not necessarily pin-compatible, alternatives.
TPS2370PW - IEEE 802.3af PoE PD Interface, 8-TSSOP | Texas Instruments
The Texas Instruments TPS2370PW is an IEEE 802.3af-compliant Power Interface Switch for Power-over-Ethernet (PoE) Powered Devices (PDs), integrating detection, classification, inrush current limiting, and a 0.3-ohm internal pass FET into a single 8-pin TSSOP (PW) package. It acts as the interface between the Power Sourcing Equipment (PSE) and the powered device, performing all functions required by the IEEE 802.3af standard. The device supports input voltages up to 67 V from the Ethernet cable and includes a 100 V rated internal switch. A PoE PD controller is a specialized power management integrated circuit that handles the front-end handshake between a PoE-enabled switch (PSE) and the device receiving power (PD). It detects a valid 25 kohm signature resistor, classifies the PD into one of five power classes (0-4) under the IEEE 802.3af spec, controls inrush current with a soft-start mechanism, and finally applies power through an integrated low-RDS(on) MOSFET. The TPS2370 occupies the power management IC hierarchy between simple hot-swap controllers and full PoE+ (802.3at) Type 2 controllers, representing the original-generation 802.3af building block. Key features include a 0.3-ohm internal pass MOSFET, programmable inrush current limiting, integrated detection signature circuitry, automatic classification signature generation, and an open-drain power-good output indicator. The 8-pin TSSOP package enables compact front-end designs for IP phones, wireless access points, and security cameras where PCB real estate is at a premium. The device operates from the 48 V nominal PoE rail but tolerates transients consistent with cable discharge events. The architecture uses a precision bandgap reference and comparators to implement the IEEE 802.3af detection signature (25 kohm equivalent resistance), and a current-mode control loop for inrush limiting. Once classification completes, the internal 100 V N-channel MOSFET is fully enhanced, minimizing DC losses. Logic-level interfaces provide ground-referred status and enable signals for downstream DC-DC converters. Typical applications include VoIP phones, wireless access points (Wi-Fi APs), IP security cameras, RFID readers, and any low-power 802.3af-compliant PD that derives its primary supply from a PoE line. Industrial sensors and building automation endpoints also benefit from single-cable power-and-data deployment enabled by this controller. When designing with this part, follow IEEE 802.3af detection and classification timing budgets closely; bypass the device with a TVS diode for cable discharge protection, and select the input bulk capacitor and inrush timing components per the datasheet's typical application circuit to avoid re-triggering detection during power-up. This page synthesizes distributor availability, drop-in alternatives to other 8-pin TSSOP PoE PD controllers, and practical layout considerations that go beyond the datasheet's typical application drawings.
TPS2370PWG4 - IEEE 802.3af PoE PD Power Interface Switch | TI
The Texas Instruments TPS2370PWG4 is an IEEE 802.3af-compliant Power-over-Ethernet (PoE) Powered Device (PD) interface switch integrating detection, classification, inrush current limiting, and a 0.3-ohm internal pass FET in a single 8-pin TSSOP package. It operates across the standard 48V PoE supply rail, performs the four-quadrant detection signature required by IEEE 802.3af, and delivers up to 13 W of available PD power through a programmable inrush current limit rather than relying solely on the 400 mA / 50 ms default limit. A Power-over-Ethernet PD controller is a specialized power management IC that sits between an Ethernet RJ-45 connector and a downstream DC-DC converter, presenting the standardized 25 kohm detection signature, the 4-step classification current, and the inrush/turn-on behavior mandated by IEEE 802.3af. In the broader taxonomy, the TPS2370 sits under Power Management IC -> Hot Swap / Power Interface Switch -> PoE PD Controller. It off-loads the thermal stress of the hot-swap FET to an internal MOSFET while exposing only a few pins to the system designer. Key features include the integrated 0.3-ohm MOSFET that eliminates an external switch, a programmable inrush current limit that lifts the ~180 uF cap-size restriction of the bare IEEE 802.3af timing, open-drain PG (power good) and PG_OFF flags for sequencing downstream converters, and an adjustable UVLO for non-standard PoE inputs. The TSSOP-8 footprint keeps the solution under 5 x 7 mm of board area, which is important for compact IP phones, wireless access points, and small surveillance cameras. Architecturally the TPS2370 combines a precision 25 kohm detection resistor network (internal), a class-current reference, a gate-charge-pumped 100 V-rated internal MOSFET, and a thermal shutdown block. Compared with discrete implementations using a hot-swap controller plus a FET plus a sense resistor, the integration reduces BOM cost by typically three parts and improves accuracy because the detection signature tracks the internal FET's on-resistance instead of an external resistor pair. Typical applications include IP phones, wireless access points, IP security cameras, IoT gateways, and any 802.3af-powered sensor or access device where a single Ethernet cable must supply both data and power. The device is also widely used as a front-end for non-PoE products that benefit from the integrated inrush and isolation coordination. When designing with the TPS2370PWG4, treat VDD-VSS as the PoE input rail directly and place the input capacitance close to those pins; downstream of the TPS2370 the rail goes to a DC-DC converter that produces the final logic voltage. The PG output can be used to enable the downstream converter only after the bulk capacitor has fully charged, eliminating the start-up overshoot common to PoE loads. This page synthesizes distributor pricing, drop-in alternatives, PoE compliance design notes, and pin-level sequencing guidance not collected in a single place in the manufacturer datasheet, giving design and procurement engineers a one-pass reference.
TPS2370PWR - IEEE 802.3af PoE PD Interface Switch | Texas Instruments
The Texas Instruments TPS2370PWR is an IEEE 802.3af Power Interface Switch for Power-over-Ethernet (PoE) Powered Devices (PD), integrating detection, classification, inrush current limiting and pass-FET control in an 8-pin TSSOP (PW) package. The part implements the physical-layer PD interface between the Ethernet RJ-45 and the downstream DC-DC converter, supporting the full 802.3af handshake with an internal 0.3-ohm low-side N-channel FET and a 100 V abs-max VPD input rating. A PoE Powered Device Controller is a specialized interface IC that sits between the Power Sourcing Equipment (PSE) on the Ethernet switch and the application load. It performs the signature resistance, power classification (Class 0-4) and inrush-limited hot-swap turn-on mandated by IEEE 802.3af, then hands a regulated bulk rail to a downstream DC-DC converter. Within the broader Power-over-Ethernet taxonomy, the TPS2370PWR belongs to the PD controller category, which complements PSE controllers and DC-DC converters to form a complete PoE end-to-end solution. Key features include 0.3-ohm internal FET on-resistance for low conduction loss, 100 V maximum input voltage on VPD for surge margin, integrated IEEE 802.3af detection signature (24.9 kohm) and classification current sourcing, programmable inrush current limiting via an external gate capacitor, and a complementary open-drain PG (power-good) output for sequencing the downstream converter. Above 20 V input the classification current is shut off to reduce internal dissipation, and an internal undervoltage lockout prevents turn-on below the 802.3af minimum operate voltage. The architecture combines a precision bandgap reference, current-mode signature generation and a gated low-side MOSFET driver. By driving only the return-side FET, the TPS2370PWR allows the upstream PSE to maintain the PoE pair-to-pair voltage regardless of PD load transients. The 8-pin TSSOP body keeps the thermal path short, and the device is rated for the industrial -40C to +85C operating range required for outdoor and industrial Power-over-Ethernet endpoints. Typical applications include VoIP telephones, wireless LAN access points, IP security cameras, IoT gateways and industrial sensors that draw their power from the Ethernet cable rather than a separate wall adapter. Placing the TPS2370PWR upstream of a wide-input DC-DC converter is the canonical architecture for any 802.3af-compliant PD. When designing with this part, ensure the inrush gate capacitor is sized for the downstream bulk capacitance to keep inrush current within the 802.3af limit, and verify the transformer bridge is 802.3af compliant with the required center-tap connection. A TVS diode on VPD is strongly recommended for surge robustness above the 100 V abs-max. This page synthesizes distributor pricing, same-brand and cross-brand drop-in alternatives, and practical PoE design notes not found on a single manufacturer page.
TPS2371PW - PoE PD Power Interface Switch, IEEE 802.3af | TI
The Texas Instruments TPS2371PW is a legacy/IEEE 802.3af-compatible Power-over-Ethernet (PoE) Powered Device (PD) power interface switch, integrating the input detection, classification, and inrush control functions required by the 802.3af standard. It packages a 100 V-rated internal low-side pass FET (return-side switch) in an 8-pin TSSOP (PW) footprint. A PoE PD interface controller is a specialized power management IC that handles the negotiation and power-path startup between a Power Sourcing Equipment (PSE) and a powered load. The TPS2371 sits between the Ethernet RJ-45 magnetics and the DC-DC converter that follows it, performing signature detection (25 kΩ resistor presentation), classification (one of Class 0-4 current signatures), and inrush-limited turn-on of the bulk input capacitor. This functional block sits within the broader power management IC hierarchy, which includes voltage regulators, supervisors, and DC-DC converters. Key features include 100 V absolute maximum input voltage on the VDD pin, programmable inrush current limiting via an external resistor, automatic classification current shutoff above 20 V to reduce internal dissipation, and support for both current- and voltage-mode classification schemes. The internal N-channel FET has a typical on-resistance of 1 Ω and supports continuous currents up to 0.5 A at the return side, with transient capability to 1.5 A. The TPS2371 is designed to operate from a single twisted-pair or 4-pair Ethernet input. The low-side (return-side) topology allows the upstream DC-DC converter to use a non-isolated buck or a flyback configuration tied to chassis ground. Internal protection includes thermal shutdown, input undervoltage lockout, and a 100 V surge-tolerant drain connection. Typical applications include 802.3af-compliant PoE PD endpoints such as wireless access points, VoIP phones, IP cameras, IoT sensors, and low-power industrial Ethernet nodes. Designers benefit from a reduced BOM by eliminating external pass-MOSFETs and discrete signature resistors, while the TSSOP-8 package supports automated assembly. When designing with this part, ensure the upstream Ethernet physical layer (PHY) magnetics provide the proper center-tap injection point to the VDD pin, and verify that the downstream DC-DC startup current draw does not exceed the configured inrush limit. The 8-pin TSSOP (PW) is a thermally enhanced package but still requires adequate copper pour for sustained high-current operation.
TPS2371PWR - Legacy PoE Power Interface Switch | TI
The Texas Instruments TPS2371PWR is a legacy IEEE 802.3af-compatible power interface switch for Power over Ethernet powered devices, with programmable inrush current limiting and an 8-pin TSSOP package. It is designed for PoE PD applications requiring controlled power admission, input protection, and startup behavior. A power interface switch is an integrated semiconductor that sits between a PoE source and the powered equipment. It controls how power is applied to the downstream circuit, helping prevent excessive startup current, protecting source equipment, and defining the operating conditions seen by the load. In the broader power-management hierarchy, this device belongs to the PoE interface-switch and power-management IC category rather than a conventional voltage regulator. The verified manufacturer information identifies the TPS2371 as a legacy IEEE 802.3af-compatible power interface switch for PoE PDs. The datasheet search result also states that IEEE 802.3af permits an inrush current of 400 mA for 50 ms, limiting the load capacitor to approximately 180 µF. The programmable inrush current limit removes that restriction and permits a larger capacitor with lower startup current. The key design trade-off is between fast startup and controlled power admission. A lower programmed inrush limit can reduce stress on the PoE source and downstream components but may lengthen startup, while a higher limit can start a larger load more quickly but places greater transient demand on the source. The device is intended to simplify legacy PoE PD power-interface designs while preserving the external 8-TSSOP footprint. Typical applications include legacy PoE powered devices, powered Ethernet endpoints, IP cameras, VoIP phones, access-point equipment, and other IEEE 802.3af-compatible PDs. The part should be selected only after checking the source's PoE classification, available power, startup timing, protection requirements, and downstream capacitance against the complete manufacturer datasheet. For implementation, follow the manufacturer application guidance for input capacitance, current-limit programming, surge protection, layout, and exposed-pad or thermal requirements where applicable. Do not infer ratings, thresholds, or timing values from distributor descriptions alone; verify them in the official TPS2371 datasheet before releasing a production design. This page consolidates verified manufacturer and distributor descriptions, separates documented facts from unavailable parameters, and provides engineering guidance for comparing this legacy PoE interface switch with possible replacements.
TPS2372-3RGWT - 802.3bt PoE PD Controller 60W | Texas Instruments
The Texas Instruments TPS2372-3RGWT is an IEEE 802.3at and IEEE 802.3bt high-power Power over Ethernet (PoE) powered device (PD) interface controller supporting up to 60 W (Type 3) in a 20-pin VQFN (RGW) 5x5 mm package. A PoE PD interface controller is the front-end power management IC that resides in the powered device of a PoE system. It performs detection, classification, inrush current limiting, and disconnect identification, then hands off power to an isolated or non-isolated DC-DC converter. It sits at the top of the PoE power hierarchy: PoE PD controller -> PoE power interface IC -> power management IC -> semiconductor. Key features include support for IEEE 802.3at (Type 2) and IEEE 802.3bt (Type 1-4) classes, Automatic MPS (Maintain Power Signature) that reduces standby power in battery-backed applications, and Autoclass that enables downstream converters to lower power losses. Protection circuits cover undervoltage lockout, overcurrent, and thermal shutdown. PGOOD status indication allows clean sequencing of the downstream converter. The TPS2372-3 variant is optimized for 60 W applications with low internal switch resistance, while the TPS2372-4 variant supports up to 90 W Type 4 designs. According to the Texas Instruments product page, the TPS2372 family contains all features needed to implement an IEEE 802.3at or 802.3bt (draft) Type 1-4 powered device. Detection and classification compliance ensures interoperability with all standard PSE (power sourcing equipment) vendors. Typical applications include LED lighting fixtures, IP security cameras, wireless access points, 5G small cells, VoIP telephones, and network switches. Its wide input tolerance (0 V to 57 V per distributor data) and integrated pass transistor reduce bill-of-materials count versus discrete MOSFET solutions. For design, budget the inrush current limit against downstream converter input capacitance, and use the PGOOD output to enable the converter only after PoE handshake completes. This page adds distributor pricing, drop-in alternatives, and practical design notes beyond the manufacturer datasheet.
TPS2372-4RGWR - 90W 802.3bt PoE PD Controller | TI
The Texas Instruments TPS2372-4RGWR is an IEEE 802.3bt (Type 1-4) Power over Ethernet (PoE) powered device (PD) interface controller that supports power levels up to 90 W at the PSE and 71.3 W at the PD input over a 100-meter CAT5 cable, housed in a 20-pin VQFN (5x5 mm) package. The -4 grade variant implements a 335-mA inrush current compatible with all PSE types. A PoE PD interface controller is the analog front-end IC that sits between the Ethernet cable's powered pairs and a device's isolated DC-DC converter. It performs detection, classification, inrush control and hot-swap switching under IEEE 802.3af/at/bt standards, forming part of the power management IC hierarchy used in networked devices such as access points, IP cameras and LED lighting. Key features include support for both IEEE 802.3at (PoE+) and IEEE 802.3bt (draft) Type 1-4 powered devices, automatic MPS (Maintain Power Signature) and Autoclass, and low internal switch resistance that permits high-power designs up to 90 W. Automatic MPS allows the PD to remove the power converter from the MPS duty cycle for energy savings, while Autoclass enables the PSE to discover actual power consumption. The TPS2372-4 uses the low inrush rating (335 mA) shared across its family, ensuring compatibility with all PSE types while a high-power PD must limit its converter startup peak current per the TI datasheet. The integrated low-resistance pass device reduces conduction losses versus discrete hot-swap MOSFET solutions. Typical applications include 802.3bt Type 3/4 LED lighting drivers, 5G small-cell radios and wireless access points, security IP cameras, network switches, and industrial IoT gateways that draw power directly from the Ethernet cable. Design consideration: pair the TPS2372-4 with a converter whose startup peak current respects the inrush envelope, and follow the TI EVM (TPS2372-3EVM-757) reference layout for the detection/classification front-end. This page synthesizes distributor pricing, drop-in alternatives, comparison data, and practical design notes not found in the manufacturer datasheet.
TPS2372-4RGWT - IEEE 802.3bt PoE PD Controller 90W | TI
The Texas Instruments TPS2372-4RGWT is a 1-channel IEEE 802.3bt (Type 1-4) Power over Ethernet powered-device (PD) interface controller supporting up to 90 W, with an integrated low-RDS(on) internal pass switch, supplied from 0 V to 57 V in a 20-pin VQFN (5x5 mm) package with exposed pad. A PoE PD controller is the front-end power-management IC that resides inside a powered device such as an IP camera, wireless access point, or LED luminaire. It performs detection, classification, and inrush-current limiting so the power-sourcing equipment (PSE) in the network switch can safely identify and power the device over the Ethernet cable. Within the power-management hierarchy, it sits between the RJ45 magnetics/diode bridge and the isolated DC-DC converter that generates the system rails. Key features of the TPS2372-4 include support for IEEE 802.3at (PoE+) and 802.3bt draft Type 1-4 power classes, Automatic MPS to maintain power through low-load periods, and Autoclass for accurate power allocation reporting to the PSE. The -4 variant's low internal switch resistance enables full 90 W Type 4 operation, while the related TPS2372-3 supports up to 60 W. Technically, the device integrates the detection and classification signature resistors, a hot-swap MOSFET with current limiting, thermal protection, and fault supervision. The low switch resistance minimizes conduction losses at the multi-ampere input currents demanded by Type 3 and Type 4 systems, improving overall efficiency and reducing heatsinking requirements. Typical applications include 802.3bt high-power LED lighting, 5G small cells and wireless access points, PTZ IP security cameras, and industrial networked devices where a single Ethernet cable delivers both data and up to 90 W of power. When designing, place the IEEE signature components (the 24.9 k-ohm detection resistor and classification resistors) directly at the VDD/RTN pins, and verify the inrush and operating current limits against your isolated converter's input capacitance to avoid nuisance tripping during startup. This page synthesizes distributor availability, same-package drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
TPS23730RMTR - 802.3bt PoE PD Controller 60W | Texas Instruments
The Texas Instruments TPS23730RMTR is an IEEE 802.3bt Type 3 (Class 1-6) Power over Ethernet powered-device (PD) controller with an integrated high-efficiency current-mode DC-DC controller, supplied in a 45-pin VQFN (RMT) package measuring 7x5 mm and rated from -40C to +125C. It integrates a robust 100-V, 0.3-ohm (typ) hotswap MOSFET and supports power levels up to 60 W, and is EA Gen 2 logo-ready as a PoE 2 PD controller. A PoE PD controller is the interface IC that negotiates power with a Power Sourcing Equipment (PSE) port, performs detection, classification, and inrush current limiting, then hands off to a DC-DC converter that produces the equipment's usable rails. Within the power-management hierarchy it spans both the PoE interface layer and the switching-regulator control layer, replacing the two-chip discrete solutions used in earlier 802.3at designs. Key differentiating features include complete single-chip 802.3bt Type 3 compliance for Class 1-6 power levels, an allocated power indicator output, support for parallel or split power operation, and a current-mode controller optimized for both flyback and active-clamp forward (ACF) topologies. The integrated 100-V hotswap MOSFET with 0.3-ohm on-resistance removes an external pass device, reducing BOM count and conduction losses at multi-amp input currents. On the technical side, the DC-DC controller section supports high-efficiency isolated and non-isolated conversions from the 48-V PoE rail, with current-mode control providing inherent cycle-by-cycle current limiting and simple loop compensation. EA Gen 2 (PoE 2) readiness means the TPS23730 passes certification requirements for next-generation high-power PoE deployments, supporting up to 60 W at the PD for Type 3 Class 6 operation. Typical applications include 5G small-cell radios and network cameras that draw 40-60 W, wireless access points, LED lighting drivers powered from Ethernet, and industrial IP intercom or display terminals where a single Cat5e cable must carry both data and power. The 60-W envelope with allocated power indicator outputs makes it particularly suitable for two-pair Type 3 PD designs. Design-wise, validate the transformer or forward magnetics for the full Class 6 power level and provide adequate PCB copper under the RMT exposed pad for hotswap MOSFET conduction and switching losses; TI's TPS23730EVM-093 reference design is the recommended starting point for new layouts. This page synthesizes distributor pricing, lifecycle data, and application guidance not found in a single manufacturer datasheet.
TPS23734RMTR - IEEE 802.3bt Type 3 PoE PD Controller | TI
The Texas Instruments TPS23734RMTR is an IEEE 802.3bt Type 3 Class 1-4 Power-over-Ethernet (PoE) Powered Device (PD) controller with an integrated high-efficiency DC-DC controller, housed in a 45-pin VQFN (RMT) package measuring 7 mm x 5 mm. As a PoE 2 / EA Gen 2 logo-ready PD controller, it includes a robust 0.3 ohm (typical) internal hotswap MOSFET and supports power levels up to 30 W operation across 802.3bt Type 3 and 802.3at PD applications. The device integrates an internal PWM controller intended for flyback or active-clamp forward primary-side-regulated DC-DC topologies, eliminating the need for an opto-isolator and significantly simplifying isolated PoE supply designs. An IEEE 802.3bt PD controller is a specialized interface IC that negotiates power classification with a Power Sourcing Equipment (PSE) over twisted-pair Ethernet cabling, then converts the incoming PoE voltage into a regulated supply rail for downstream loads. These devices sit at the front end of PD hardware such as IP phones, wireless access points, security cameras, and IoT gateways, and they bridge the PoE interface standard with the application board. Within a power-management taxonomy the TPS23734 is part of: PoE PD controller -> Power-over-Ethernet IC -> Power Management Interface IC -> Power Management -> Semiconductor. Key differentiating features of the TPS23734RMTR include integrated primary-side regulation (PSR) which removes the secondary-side feedback optocoupler and TL431, an automotive temperature grade of -40 C to +125 C, and EA Gen 2 logo-ready compliance with the IEEE 802.3bt specification. The internal hotswap FET minimizes external component count and the device supports all five 802.3bt classes (Class 1 through Class 4), enabling a single PCB design to address 15 W, 30 W, and intermediate power levels in the same hardware platform. The architecture pairs a hardened PoE interface front-end (signature, classification, and inrush control) with an integrated current-mode PWM controller optimized for high-efficiency flyback conversion. Primary-side regulation samples auxiliary winding voltage during the MOSFET off-time to close the loop without secondary-side feedback parts. This topology reduces BOM cost, improves MTBF, and avoids the bandwidth and aging limitations of opto-isolated feedback. Typical applications for the TPS23734RMTR include PoE-powered wireless access points (Wi-Fi 6/6E APs), IP surveillance cameras, VoIP phones, IoT and smart-building sensors, and industrial PoE-powered controllers where isolated, regulated 5 V, 12 V, or 24 V rails are required from 42-57 V PoE inputs. Up to 30 W operation covers most single-board PoE appliances. When designing with this device, pay close attention to the transformer design for PSR applications - the auxiliary winding ratio directly sets output voltage accuracy, and proper RCD snubber sizing is essential for efficiency. Layout should keep the hotswap path short and place the bootstrap capacitor immediately adjacent to the BOOT pin to avoid PWM-controller UVLO. Operating ambient temperature may limit output power; derate using the application-specific thermal profile. This page synthesizes distributor pricing, drop-in alternative MPNs, and practical design notes not consolidated in the manufacturer datasheet, giving engineers an actionable reference for selecting the TPS23734RMTR in new PoE PD designs.
TPS23751PWPR - 802.3at PoE+ PD Interface & Flyback Controller | TI
The Texas Instruments TPS23751PWPR is an IEEE 802.3at (PoE+) powered-device (PD) interface controller combined with a current-mode flyback DC-DC PWM controller, delivered in a 16-pin HTSSOP (PWP) package with exposed PowerPAD, rated up to 25.5 W from a 0 V to 57 V PoE input range. A Power-over-Ethernet powered-device interface is the front-end circuit that negotiates and validates power delivery over Ethernet cabling per the IEEE 802.3af/at standards, handling detection, classification, and inrush current limiting before an isolated or non-isolated DC-DC converter converts the 37 V to 57 V PoE rail to system voltages. In the power-management hierarchy it sits between the Ethernet magnetics/diode bridges and the system power tree. Key features include hardware type-2 classification per IEEE 802.3at, an auxiliary power detect (APD) input that enables seamless switchover between PoE and wall-adapter power, and a current-mode PWM controller optimized for high efficiency across wide load ranges, supporting both flyback and synchronous flyback topologies. The integrated thermal protection and precision 25.5 W class-4 signature support full PoE+ designs such as wireless access points and IP security cameras. Technically, the PoE section implements detection, classification, and a controlled inrush path with a pass device, while the controller section uses peak current-mode control with programmable oscillator frequency, enabling optimized transformer designs and high light-load efficiency - important for energy-efficient (Energy-Efficient Ethernet adjacent) designs. Typical applications include 802.3at PoE+ wireless access points, IP phones, IP surveillance cameras, and networked industrial equipment that must draw power from the Ethernet cable or fall back to auxiliary adapter power. Design consideration: keep the detection and classification resistor networks within IEEE tolerance, and use the PowerPAD soldered to a copper pour for thermal dissipation at full PoE+ load. This page synthesizes distributor data, the TPS23750 comparison, and practical PoE design notes not found in the datasheet. Pricing shown is as of 2026-10-19.
TPS23753A - IEEE 802.3at PoE PD Interface + DC-DC Controller | TI
The Texas Instruments TPS23753A is a combined Power over Ethernet (PoE) powered device (PD) interface and current-mode DC-DC controller optimized specifically for isolated converter designs, supporting the IEEE 802.3at standard as a 13-W, type 1 PD in a 14-pin TSSOP (PW) package. A PoE powered-device interface is the front-end circuit that safely extracts power from an Ethernet cable. It performs detection, classification, inrush limiting, and load switching per the IEEE 802.3af/802.3at standards, then hands regulated power to an isolated (or non-isolated) DC-DC converter stage. Within the power-management hierarchy, the TPS23753A belongs to the PoE controller family that integrates both the PD interface and the PWM controller in a single semiconductor device, reducing external component count versus discrete two-chip solutions. Key features include a complete IEEE 802.3at-compliant PoE interface with enhanced ESD ride-through capability, an integrated robust 100-V, 0.7-ohm hotswap MOSFET that eliminates a discrete external FET, programmable switching frequency with synchronization support for noise-sensitive designs, and adapter ORing support with 12-V adapter operation for auxiliary-power architectures. On the technical side, the device uses a current-mode control architecture optimized for isolated flyback and forward converter topologies, which simplifies transformer-based designs commonly used in PoE PD applications. The hotswap MOSFET integration reduces BOM cost and board area, while the ESD enhancements improve field robustness on long Ethernet cable runs where surge and ESD events are common. Type 1 compliance means the device advertises and manages up to 13 W at the PD input, a superset of the original IEEE 802.3af requirements. Typical applications include IP security cameras, IP telephones, wireless access points, and networked industrial sensors, where the TPS23753A converts PoE line power into one or more isolated low-voltage rails for the system electronics. Design consideration: because the integrated 100-V hotswap MOSFET handles the full PD input current, verify inrush and thermal margins at your maximum load; the 13-W type 1 budget must cover converter efficiency losses, so plan the transformer and output design around roughly 10-12 W of usable output power. This page synthesizes distributor availability data, the TI/TI-E2E-verified distinction between TPS23753 and TPS23753A, drop-in alternative analysis, and practical design guidance not found in the manufacturer datasheet. Pricing shown is as of 2026-10-19.
TPS23755RJJR - IEEE 802.3at PoE PD with Flyback Controller | TI
The Texas Instruments TPS23755RJJR is an IEEE 802.3at Power over Ethernet (PoE) powered device (PD) interface and current-mode no-opto flyback DC-DC controller that integrates a 150-V switching power FET, housed in a 24-pin VSON (6x4 mm) package. A PoE powered device interface is the front-end circuit that negotiates and extracts power from a Power Sourcing Equipment (PSE) port such as a PoE switch or injector, according to the IEEE 802.3at standard. Within the power-management hierarchy, it sits between the Ethernet cabling and the isolated flyback converter that generates the system's low-voltage rails, combining classification, inrush control, hot-swap protection, and switching regulation in one IC. Key features include full 802.3at Type 1 (13 W) PD compliance, an integrated 150-V power MOSFET that eliminates the external pass switch, and current-mode flyback control with primary-side regulation (PSR). PSR removes the optocoupler and secondary-side reference, cutting component count and board area while improving reliability in isolated designs. Technically, the device employs spread spectrum frequency dithering (SSFD) to reduce conducted EMI peaks, easing filter design toward CISPR compliance. Advanced startup circuitry supports operation from the PoE detection and classification voltage range before full power is available, and the current-mode architecture provides inherent cycle-by-cycle current limiting and simple loop compensation for the flyback power stage. Typical applications include IP security cameras, wireless access points, VoIP phones, and networked LED lighting luminaires - all space-constrained PoE endpoints where a single-chip PD interface plus converter saves measurable board area. The high integration level makes it especially attractive for compact, cost-sensitive camera modules. Design consideration: because the power FET is integrated, PCB copper area under the VSON exposed pad is the main thermal path; size the transformer and demagnetization timing so PSR sampling windows are honored, and verify EMI with SSFD enabled before final layout freeze. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
TPS23755RJJT - 802.3at PoE PD + Flyback Controller | TI
The Texas Instruments TPS23755RJJT is an IEEE 802.3at Power over Ethernet (PoE) powered-device (PD) interface controller with an integrated 150-V switching power FET and a current-mode no-opto flyback DC-DC controller, supplied in a 24-pin VSON CLCC (6x4 mm) package with exposed pad and delivering up to 13 W of isolated output power from a 57 V PoE input. A PoE powered-device interface controller is a power management IC that performs the detection, classification, inrush current limiting, and undervoltage-lockout functions demanded by the IEEE 802.3at standard, then hands off the validated power to an isolated or non-isolated DC-DC converter stage. It sits between the RJ45 Ethernet port and the converter, forming the entry point of the PD power architecture. Key features include full IEEE 802.3at Type 2 compliance with two-event classification, an internal 150 V power MOSFET that eliminates a discrete switching FET, primary-side regulation (PSR) that removes the optocoupler and secondary feedback circuitry, and spread spectrum frequency dithering (SSFD) for reduced EMI. Advanced startup supports bias from the auxiliary (adapter) power path. The current-mode flyback controller integrates the control loop, oscillator, and drivers, enabling compact, low-component-count designs. PSR senses output voltage from the primary-side auxiliary winding, simplifying the transformer and secondary circuit while supporting regulated isolated outputs typical of 5 V and 12 V PD loads. Typical applications include IP security cameras, wireless access points, VoIP phones, and network-connected LED lighting drivers powered directly from the Ethernet cable. Design consideration: provide adequate copper area under the VSON exposed pad for thermal dissipation and follow the datasheet PCB layout guidelines for the switching loop to limit EMI. This page synthesizes distributor sourcing data, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet alone.