Controladores de MOSFET de potencia
Productos (714)
TPS1HB08BQPWPRQ1 - 40V 8mΩ Smart High-Side Switch | TI
The Texas Instruments TPS1HB08BQPWPRQ1 is a 40-V, 8-mΩ, single-channel smart high-side switch intended for 12-V automotive systems, delivered in a 16-pin HTSSOP (PWP) package with PowerPAD exposed thermal pad. It is qualified to AEC-Q100 grade 1 and integrates a low-Rdson N-channel MOSFET with on-resistance of 8 mΩ typical, supporting continuous load currents up to 70 A per the DigiKey listing, with an operating voltage range of 4 V to 18 V nominal and absolute maximum of 40 V. A high-side switch is a power-distribution topology that places the switching element between the supply rail and the load, allowing the load to be tied to chassis ground and providing inherent short-to-ground protection. Smart high-side switches extend this with on-die diagnostics and protection. In the system hierarchy, the TPS1HB08BQPWPRQ1 sits inside the power-management subsystem (load driver -> high-side switch -> power distribution IC -> automotive PMIC), enabling ECU designers to replace discrete MOSFETs, fuses, and sense resistors with a single AEC-Q100 qualified device. Key features include an adjustable current limit (6.4 A to 70 A depending on variant), integrated thermal shutdown, reverse-battery and load-dump protection, open-load detection in on and off states, short-to-ground and short-to-battery diagnostics, and a current-sense analog feedback output. The exposed thermal pad and 8 mΩ on-resistance minimize conduction loss and junction-temperature rise at heavy loads. The device operates across -40°C to +125°C ambient, satisfying under-hood automotive requirements. Architecturally, the TPS1HB08-Q1 combines a vertical N-channel power MOSFET with charge pump, gate driver, current-sense mirror, and an SPI-compatible or PWM-friendly control interface. The charge pump maintains gate enhancement at low VIN, while the analog CSN pin provides a ground-referenced current proportional to load current for closed-loop monitoring and fault detection. Typical applications include automotive body electronics such as headlight LED drivers, HVAC blower and fan control, seat and mirror actuators, infotainment power rails, and front-camera heater supplies. It is also used in zone-architect 12-V domain controllers where each high-current rail requires independent protection and diagnostics. When designing with this device, allocate sufficient PCB copper area to the PowerPAD to keep junction temperature below 150°C under worst-case VIN and ILOAD, and bypass VIN with at least 100 nF plus 10 µF ceramic placed within 5 mm of the pin. Use the CSN sense resistor value to set the analog current-limit threshold for your load. This page synthesizes distributor pricing, drop-in alternatives, and practical thermal/diagnostic notes that complement the manufacturer datasheet for AEC-Q100 design reviews.
TPS2001CDGKR - 2A USB Power Switch, 72mΩ, 5V VSSOP-8 | TI
The Texas Instruments TPS2001CDGKR is a single-channel, current-limited USB power-distribution switch housed in an 8-pin VSSOP (DGK) package. It delivers up to 2 A continuous load current from a 4.5 V to 5.5 V input rail, with a 72 mΩ (typical) N-channel MOSFET high-side switch that minimizes voltage drop and power dissipation in USB and other hot-plug applications. A power-distribution switch (also called a USB power switch or load switch) is a smart high-side MOSFET combined with protection circuitry. It sits between a system power rail and a downstream port, providing controlled turn-on, fault isolation, and current limiting. Within the broader taxonomy, a load switch sits beneath hot-swap controllers and above discrete MOSFETs in the power-management hierarchy, typically integrating an N-channel MOSFET, charge pump, current sense amplifier, and fault logic into one IC. Key features of the TPS2001CDGKR include a fixed 2 A current-limit threshold with ±20% accuracy, fast 2 µs short-circuit response, true reverse-current blocking when disabled, an output discharge resistor for safe USB VBUS decay, and an active-high enable input for power sequencing. The device asserts an active-low fault flag (OC) whenever the output exceeds the current-limit threshold or experiences a reverse-voltage condition, simplifying host monitoring in compliant USB ports. The device uses an internal charge pump to drive the gate of the N-channel MOSFET, achieving low Rds(on) without requiring an external bootstrap supply. Built-in thermal protection shuts down the switch when junction temperature rises excessively, and auto-restart resumes operation once the fault clears. The 8-VSSOP (DGK) footprint (3.0 mm body width) is compatible with industry-standard pinouts, allowing direct layout reuse across the TPS20xxC family. Typical applications include USB 2.0/3.0 downstream ports on motherboards and hubs, charging ports for tablets and smartphones, set-top boxes, and any 5 V rail requiring inrush and short-circuit protection. The combination of high current limit, low on-resistance, and true reverse blocking makes it a strong fit for hot-plug VBUS distribution where back-feeding from peripherals must be prevented. When designing with the TPS2001CDGKR, observe input-capacitor placement guidelines and ensure the trace between IN and GND pins is short and wide to handle inrush transients. Decoupling with a 1 µF ceramic between IN and GND is strongly recommended to keep the device stable during load steps. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
TPS2041BQDBVRQ1 - Automotive 0.5A USB Power Switch SOT-23-5 | TI
The Texas Instruments TPS2041BQDBVRQ1 is an automotive-qualified, single-channel, current-limited USB power-distribution switch housed in a 5-pin SOT-23 (DBV) package. It delivers a continuous load current of 500 mA from a 2.7 V to 5.5 V input rail, with an on-resistance of 105 mΩ (typical) and a factory-trimmed current limit of approximately 1 A. The TPS2041BQDBVRQ1 is the AEC-Q100 qualified variant of the TPS2041B, engineered for harsh automotive power-distribution environments. A USB power-distribution switch is a high-side load switch that sits between a 5 V bus and a downstream USB port or peripheral. It protects the host system from short circuits and over-current events by combining an N-channel MOSFET pass element with built-in current-limit, thermal shutdown, and undervoltage lockout. When the host asserts the active-low enable input, the switch closes to deliver current; when disabled, it presents a high-impedance path to block back-feeding. Key features include an accurate current limit at approximately 1 A, an integrated 105 mΩ N-channel MOSFET, thermal and short-circuit protection, an active-low logic enable input, and a flag output that asserts on fault. The SOT-23-5 footprint keeps board area minimal, making the part suitable for compact infotainment, telematics, and body-electronics modules where PCB real estate is constrained. The TPS2041BQDBVRQ1 uses an N-channel MOSFET pass element driven by an internal charge pump to achieve true low-RDS(on) high-side switching. This architecture minimizes I²R conduction loss on the 5 V rail and keeps thermal rise modest at the 500 mA continuous rating. The fixed current limit prevents the upstream automotive bus from sagging during load transients, while the thermal-shutdown circuit latches the switch off on excessive junction temperature. Typical applications include USB port power switching in automotive head units, body control modules, and rear-seat infotainment hubs. The device is also used to switch individual loads downstream of an LDO, providing fault isolation between branches. The wide input range (2.7 V to 5.5 V) tolerates cold-crank and load-dump conditions typical of 12 V automotive systems after regulation. When designing with this device, ensure the input supply is well-decoupled with at least 1 µF of ceramic capacitance placed close to IN. Avoid continuous operation above 500 mA and verify thermal performance against the SOT-23-5 θJA. This page synthesizes distributor pricing, drop-in alternatives, and design considerations not found in the manufacturer datasheet alone.
TPS2054 - Quad 0.5A USB Power Switch 80mOhm | Texas Instruments
The Texas Instruments TPS2054 is a quad-channel power-distribution switch integrating four N-channel MOSFET high-side switches in a single 16-pin SOIC package. Each channel supports 500 mA continuous current with a 0.9 A current limit, operating from a 2.7 V to 5.5 V input range with 80 mOhm maximum on-resistance (5 V input) and active-high enable inputs. A power-distribution switch is a type of load switch within the power management IC hierarchy that sits between a supply rail and its load, providing controlled turn-on, fault protection, and status reporting. USB power switches specifically guard downstream ports against overcurrent and short-circuit faults, preventing host rail collapse in systems that distribute 5 V power to multiple peripheral ports. Key features include 500 mA continuous current per channel for USB compliance, 135 mOhm typical high-side MOSFET resistance, short-circuit and thermal protection, and an overcurrent logic output (nFAULT) that signals fault conditions to the host controller. The device offers logic-level enable inputs, a 2.5 ms typical output rise time that limits inrush current during hot-plug events, and undervoltage lockout for predictable startup behavior. Internally, each switch uses a charge-pumped N-channel MOSFET gate drive with precision current-sense circuitry. When load current exceeds the 0.9 A limit, the device enters constant-current mode; sustained faults trigger thermal shutdown per channel. The open-drain overcurrent output allows direct connection to a microcontroller GPIO with a pull-up resistor. Typical applications include USB hub port power control, self-powered and bus-powered USB peripherals, multi-port charging accessories, hot-plug power switching in embedded systems, and industrial power-rail partitioning requiring per-channel fault isolation. Design tip: the controlled 2.5 ms rise time removes the need for external soft-start circuitry, but ensure PCB traces per channel are rated for 0.9 A fault current and place the input/output bypass capacitors close to the device pins for stable current-limit behavior.
TPS2054AD - Quad 500mA USB Power Distribution Switch | TI
The Texas Instruments TPS2054AD is a quad-channel current-limited power-distribution switch integrating four 80 mOhm N-channel MOSFET high-side switches, delivering 500 mA continuous current per channel (0.9 A minimum current limit) from a 2.7 V to 5.5 V input range in a 16-pin SOIC (D) package. A power-distribution switch, also called a high-side load switch or USB power switch, is a power management IC that sits between a supply rail and a load, turning the load on and off with a logic-level enable signal while protecting the upstream supply from faults. Within the power management hierarchy, it belongs to the power-distribution switch and load-driver class, complementing voltage regulators and hot-swap controllers in multi-port systems. Key features include independent enable inputs (CMOS- and TTL-compatible, active-high) for each channel pair, a per-channel current limit with independent thermal and short-circuit protection, and a shared fault-report logic output that flags overcurrent conditions to a host controller. A 2.5 ms typical output rise time limits inrush current when switching heavy capacitive loads, and undervoltage lockout keeps the outputs off until the input rail is valid. Architecturally, each N-channel MOSFET switch is driven by an internal charge-pump gate driver, which keeps on-resistance low at only 80 mOhm and minimizes voltage drop at full 500 mA load. Response to short circuits is fast, protecting the input rail from brownout during fault events. Typical applications include USB host and hub port power switching, hot-plug power distribution in set-top boxes and peripherals, and multi-rail power sequencing in industrial systems where heavy capacitive loads and short circuits are likely. A key design consideration: at 5.5 V input and full load on all four channels, estimate conduction loss as 4 x I^2 x RDS(on) = 4 x 0.25 x 0.08 = 80 mW (estimated), which the SOIC-16 package dissipates without a heatsink, but PCB copper around pins still aids thermal relief. This page adds value beyond the manufacturer datasheet by synthesizing distributor pricing, drop-in same-brand alternatives (TPS2054BD, TPS2054DG4), and practical design notes for power-distribution switching designs.
TPS2062CDGNR - Dual 1A USB Power Switch | Texas Instruments
The Texas Instruments TPS2062CDGNR is a dual-channel, current-limited, power-distribution switch designed for USB and other hot-swap applications where heavy capacitive loads and short-circuits may be encountered. It integrates two 70-mΩ high-side N-channel MOSFET switches with independent enable inputs, providing a compact and robust power-switching solution in an 8-pin HVSSOP (DGK) package with exposed thermal pad. The device operates over an input voltage range of 2.7V to 5.5V and supports a continuous load current of 1A per channel, with a fixed current-limit threshold of 1.5A (typical) and an accurate ±20% current-limit tolerance. A power-distribution switch is a type of load switch that provides controlled power delivery to downstream circuits, offering protection against overcurrent, short-circuit, and over-temperature conditions. It sits between the power source and the load, acting as a smart switch that can be enabled or disabled via a control signal. In the system hierarchy, a power-distribution switch is a subset of power management ICs, which also include voltage regulators, DC-DC converters, and battery management devices. The TPS2062C family is specifically optimized for USB ports, where it ensures safe power delivery and protects the host controller from fault conditions. Key features of the TPS2062CDGNR include a fast overcurrent response time of 2 µs (typical), which quickly limits fault current to protect upstream components. The device also provides reverse current blocking, output discharge function, soft-start to reduce inrush current, and under-voltage lockout (UVLO) to ensure proper operation during power-up. Built-in over-temperature protection and short-circuit protection further enhance system reliability. The active-low enable inputs allow for simple logic control, and the 70-mΩ on-resistance minimizes power loss and voltage drop across the switch. Technically, the TPS2062CDGNR uses a constant-current limiting scheme that maintains a safe output current during overload conditions, preventing damage to the switch and the load. The output discharge function actively pulls the output to ground when the switch is disabled, ensuring no residual voltage remains on the load. The soft-start feature limits inrush current when driving capacitive loads, which is critical for USB applications where downstream capacitors can be large. The device is specified for operation over the industrial temperature range of -40°C to +125°C, making it suitable for a wide range of environments. Typical applications include USB ports on computers, hubs, and peripherals, as well as general-purpose power switching in consumer electronics, industrial equipment, and set-top boxes. The dual-channel configuration allows two independent loads to be controlled from a single device, saving board space and cost. The TPS2062CDGNR is also ideal for powering downstream devices in systems that require hot-swap capability, such as docking stations and battery chargers. When designing with this device, ensure that the input and output capacitors are placed close to the pins to minimize parasitic inductance and maintain stable operation. The exposed thermal pad should be soldered to a large copper area on the PCB to enhance heat dissipation, especially when operating at high currents. Additionally, the enable pins should be driven with proper logic levels to avoid unintended switching.
TPS2062DR - Dual 1A USB Power Switch | Texas Instruments
The Texas Instruments TPS2062DR is a dual-channel, current-limited power distribution switch designed for USB and general-purpose power management applications. It integrates two 70-mΩ high-side N-channel MOSFETs, each capable of delivering up to 1 A continuous current, with an input voltage range of 2.7 V to 5.5 V. The device is housed in an 8-pin SOIC (D) package and features an active-low enable input, making it suitable for power sequencing and hot-swap applications. A power distribution switch is a semiconductor device that controls and protects power delivery to downstream loads. It typically includes a high-side MOSFET, current sensing, and protection features such as overcurrent, thermal shutdown, and undervoltage lockout. In a system hierarchy, the TPS2062DR sits between the main power rail and peripheral devices, acting as a smart switch that can be turned on/off via a logic signal while providing fault protection. Key features of the TPS2062DR include a 70-mΩ high-side MOSFET, 1-A continuous current per channel, accurate current limit (1.1 A min, 2.1 A max), thermal and short-circuit protection, undervoltage lockout, deglitched fault report (OC), and a typical rise time of 0.6 ms. The active-low enable input allows for straightforward control from microcontrollers or logic gates. The device operates over a junction temperature range of -40°C to 125°C, making it suitable for industrial and automotive environments. Technically, the TPS2062DR uses a current-limited architecture that ensures safe operation under overload conditions. The accurate current limit prevents excessive current draw, protecting both the switch and the load. The deglitched fault report (OC) provides a clean signal to the host controller, avoiding false triggers from transient currents. The undervoltage lockout ensures the switch remains off until the input voltage is stable, preventing erratic behavior during power-up. Typical applications include USB port power switching, hot-swap power distribution, and power management in consumer electronics, industrial equipment, and networking devices. The dual-channel configuration allows independent control of two loads, making it ideal for applications requiring multiple power domains. When designing with the TPS2062DR, ensure adequate input and output capacitance to maintain stability and minimize voltage transients. Place the device close to the load to reduce parasitic inductance and improve fault response. The active-low enable pin should be pulled up or driven by a logic signal; do not leave it floating.
TPS2115APW - 1.25A, 5.5V Power Mux w/ Status | Texas Instruments
The Texas Instruments TPS2115APW is a 2.8-V to 5.5-V, 84-mΩ, 1.25-A autoswitching power multiplexer (power mux) housed in an 8-pin TSSOP (PW) package. It accepts two input supplies (IN1 and IN2) and delivers a regulated output to a common load with sub-ohm (84 mΩ typical) N-channel MOSFET pass elements per channel. The device features manual and automatic switchover modes, a STATUS output flag, and cross-conduction blocking logic to prevent momentary shorting between the two sources during transitions. A power mux is a category of power-management IC that arbitrates between two or more DC input sources (battery, wall adapter, USB, auxiliary rail) and routes one of them to the load. Within the broader taxonomy, power muxes sit below load switches and above simple ideal-diode OR-ing controllers, combining the low-loss benefits of MOSFET pass elements with intelligent source-selection logic. The TPS2115A family specifically targets systems requiring seamless transitions between a primary and backup supply without brown-outs on the load. Key features of the TPS2115APW include 84 mΩ typical on-resistance per channel, low 0.5 µA standby current, programmable current limiting, inrush current control, thermal shutdown protection, and a wide 2.8 V to 5.5 V operating range on both input rails. The integrated STATUS pin reflects which source is currently active, enabling host-side telemetry in multi-rail systems. Architecturally, the TPS2115APW uses back-to-back N-channel MOSFETs per channel driven by charge-pumped gate drivers. The body-diode reverse-blocking design prevents unintended current flow from a higher-voltage rail into a lower-voltage rail. The control logic implements break-before-make switching with user-programmable switchover thresholds and switching speed. Typical applications include battery-backed-up portable electronics, USB/wall-adapter power switching in handheld terminals, multi-rail industrial sensor nodes, redundancy power OR-ing in 5V systems, and any application requiring glitch-free transitions between two DC sources. When designing with the TPS2115APW, consider that the TSSOP-8 package has a thermal resistance of approximately 150 °C/W; continuous 1.25 A operation at high VIN requires adequate copper pour. The MS pin (mode select) and ILIM pin (current limit) require external component selection to balance inrush vs steady-state behavior. Cross-conduction blocking eliminates the need for external back-to-back FETs, simplifying BOM. This page synthesizes distributor pricing, drop-in alternatives within the TSSOP-8 footprint, and design guidance not found in the manufacturer datasheet alone - giving procurement and design engineers a one-stop reference for source-selection decisions.
TPS2121RUX - 22V 4.5A Priority Power MUX | Texas Instruments
The Texas Instruments TPS2121RUX is a 2.7-V to 22-V, 56-mΩ, 4.5-A priority power multiplexer (power MUX) with seamless switchover, housed in a 12-pin VQFN-HR (RUX) package measuring 2.0 mm × 2.5 mm. It manages two input power sources (IN1 and IN2) and selects one to power a single output (OUT) according to a user-defined priority scheme. The device supports up to 4.5 A continuous load current with an internal 56-mΩ (typical) Rds(on) MOSFET per channel, with adjustable current limit set by an external resistor. A power multiplexer is a load-sharing/redundancy switch that allows a system to draw power from one of two sources with priority logic, automatic switchover, and in-rush control. The TPS2121 belongs to the ORing controller / power MUX / load-switch product hierarchy, sitting between discrete MOSFET ORing designs (anode-to-cathode diodes or ideal-diode controllers) and full PMIC solutions. It integrates dual back-to-back N-channel MOSFETs, priority arbitration, adjustable current limit, soft-start, and seamless fast switchover (< 5 µs) inside a tiny QFN footprint, eliminating dozens of discrete components. Key features include 2.7-V to 22-V operating input range, 56-mΩ per-channel Rds(on), 4.5-A continuous current capability, adjustable current limit (ILIM), seamless switchover within 5 µs, and a logic-controlled priority mode (PR1 = High → IN1 priority; PR1 = Low → IN2 priority). The VQFN-HR-12 (RUX) package has an exposed thermal pad (PowerPAD) for low thermal resistance, supporting up to ~2 W continuous dissipation on a modest PCB copper pour. The device operates over -40 °C to +125 °C junction temperature and is characterized for industrial-grade environments. The architecture uses TI's priority-based power-path control: the device continuously compares IN1 and IN2 voltages against an internal reference (2.5 V typical on PR1) and switches to the higher-priority source when it is valid. During switchover, internal break-before-make control prevents cross-conduction; the output is held up by output capacitance during the brief (~5 µs) transition. The current-limit and soft-start blocks protect against in-rush spikes when a freshly-selected source is brought online. Typical applications include redundant power rails in industrial PLCs and factory automation, backup battery switching in portable medical and IoT devices, USB-C PD source multiplexing, multi-battery Point-of-Sale (POS) terminals, and automatic transfer of AC adapters versus battery in notebook docking stations. The compact 2 mm × 2.5 mm footprint makes it ideal for space-constrained designs that previously required a discrete ORing controller plus two MOSFETs. When designing with the TPS2121, place input and output ceramic capacitors as close as possible to the IC pins (10 µF minimum on IN1, IN2, and OUT recommended) to minimize voltage droop during switchover. Use the PR1 resistor divider to set the VIN1 priority threshold, set ILIM with an external resistor (RILIM = K / ILIM), and provide adequate copper area on the PowerPAD for thermal dissipation. Avoid parallel connection of multiple TPS2121 units - one device per system is standard. This page synthesizes distributor pricing, drop-in alternatives, prioritized selection guidance, and practical PCB layout notes that go beyond a typical manufacturer datasheet summary.
TPS22919-Q1 - 5.5V 1.5A Load Switch SC-70-6 | Texas Instruments
The Texas Instruments TPS22919-Q1 is a self-protected, single-channel load switch with controlled slew rate that integrates an N-channel MOSFET operating from 1.6 V to 5.5 V input, supporting up to 1.5 A of continuous current in a 6-pin SC-70 (DCK) package. The device offers a 90 mOhm typical on-resistance and AEC-Q100 Grade 1 automotive qualification. A load switch is a power management IC that acts as an electronic switch between a power rail and its load, enabling or disabling power delivery under logic control. Load switches sit within the power distribution and protection hierarchy of a system, complementing voltage regulators, e-fuses, and hot-swap controllers. They are used to sequence rails, reduce leakage in standby, and isolate faults downstream. Key differentiating features of the TPS22919-Q1 include controlled output slew rate for inrush-current limiting during turn-on, adjustable quick output discharge (QOD) that pulls the output low when the switch is off, and integrated self-protection including short-circuit current limiting. According to TI, the device is qualified for automotive applications under AEC-Q100 device temperature grade 1. The internal N-channel MOSFET pass element gives a low, well-controlled on-resistance of 90 mOhm, which limits voltage drop: at 1 A the drop is roughly 90 mV, dissipating about 90 mW. The controlled slew rate soft-starts capacitive loads, avoiding the large inrush spikes that can sag upstream rails or trip protection circuits. The QOD function is adjustable via an external resistor, letting designers trade discharge speed against pull-down current. Typical applications include automotive camera and sensor modules, infotainment power distribution, peripheral-rail switching in ADAS domains, and portable or industrial designs needing fault-isolated power gating. The wide 1.6 V to 5.5 V input range covers 1.8 V, 3.3 V, and 5 V rails in one footprint. For design, account for the Rds(on) power loss at high current, ensure the ON-pin logic threshold matches the controlling GPIO, and size the QOD resistor for the required discharge time. Do not rely on the switch to regulate voltage - it only gates the rail. This page synthesizes distributor availability data, drop-in alternatives, and practical design guidance not found in the manufacturer datasheet.
TPS22970YZPR - 3.6V 4A 4.7mΩ Load Switch | Texas Instruments
The Texas Instruments TPS22970YZPR is a small, space-saving N-channel high-side load switch rated for 3.6 V operation, 4 A pulsed switch current, and 4.7 mΩ typical on-resistance, packaged in an 8-ball DSBGA (WCSP, YZP) chip-scale package. It integrates an N-channel MOSFET biased by a charge pump, an on/off logic input, and an optional output discharge resistor for controlled turn-off behavior. What is a load switch? A load switch is a power-management device that uses an internal MOSFET to connect or disconnect a downstream circuit (a "rail" or "load") from an upstream power source. Unlike a DC-DC converter, a load switch does not regulate voltage — its role is gating, inrush control, sequencing, isolation, and reverse-current blocking. Load switches belong to the broader category of power distribution switches (PDswitches), which sit hierarchically below discrete MOSFETs but above simple pass-gate FETs because they integrate control, protection, and timing into a single IC. Key features of the TPS22970YZPR include a wide input voltage range of 0.65 V to 3.6 V (compatible with 1-cell Li-ion rails as well as 1.0 V/1.2 V/1.8 V/2.5 V/3.3 V logic rails), continuous current up to 2 A and pulsed current up to 4 A, 4.7 mΩ RON that minimizes conduction loss, controlled turn-on to limit inrush current, and an internal discharge path that pulls the output to ground when the switch is disabled. The device operates over -40°C to +105°C and ships on a 0.9 mm pitch WCSP footprint measuring roughly 1.50 mm × 1.50 mm. Architecturally, the integrated charge pump generates a VGS boost above VIN so the NMOS can fully enhance even at very low input voltages — a non-trivial achievement because a standard NMOS would otherwise struggle to pass sub-1 V rails cleanly. This makes the part especially attractive for ultra-low-voltage core rails in mobile and battery-powered designs. Typical applications include power gating in smartphones, wearables, SSDs and solid-state storage modules, portable medical devices, and IoT sensor nodes where the load switch isolates a sleeping sub-system from a battery to extend standby life. The output discharge resistor is particularly useful in multi-rail systems where residual charge on a disabled rail could otherwise leak through the body diode of a downstream load. When designing with this device, pay close attention to the PCB footprint: the WCSP-8 (DSBGA) package requires NSMD pads with precise solder-mask openings and reflow profile matched to JEDEC J-STD-020. Avoid placing vias directly under the balls and follow TI's WCSP layout recommendations. This page synthesizes distributor pricing from DigiKey and Mouser, drop-in alternatives from TI's load-switch family, and practical design notes not found in the manufacturer datasheet.
TPS22990DMLR - 10A, 5.5V, 3.9mOhm Load Switch | TI
The Texas Instruments TPS22990DMLR is a single-channel N-channel high-side load switch delivering up to 10 A continuous current with a 3.9 mOhm typical on-resistance, operating over an input voltage range of 0.6 V to 5.5 V in a 10-pin WSON (3x2 mm) package (DML, WSON-10 with exposed pad). A load switch is a power distribution IC that sits between a supply rail and its load, using an internal MOSFET pass element to connect, disconnect, and protect the rail. In the power-management hierarchy, load switches are siblings of hot-swap controllers and eFuses within power distribution ICs, and they are commonly paired with DC-DC converters and LDO regulators to sequence and gate individual rails. Key features of the TPS22990 include the ultra-low 3.9 mOhm on-resistance, which minimizes voltage drop and conduction power loss at high load currents; controlled and adjustable turn-on slew rate via an external CT capacitor, which suppresses inrush current and bus voltage sag; and an integrated power-good (PG) indicator for rail monitoring and sequencing. An optional quick output discharge (QOD) function actively pulls the output low when the switch is off. Architecturally, the device integrates an N-channel MOSFET pass element with gate-drive circuitry powered from a VBIAS supply, allowing the switch to operate down to 0.6 V input while supporting modern low-voltage rails. The adjustable rise time lets designers trade startup time against inrush current for a given output capacitance. Typical applications include server and notebook point-of-load power gating, SSD and storage rail switching, multi-rail power sequencing in SoC and FPGA systems, and battery-powered equipment where low voltage drop is critical. A key design consideration: at 10 A, even 3.9 mOhm dissipates roughly 0.39 W, so PCB copper area under the exposed pad is essential for thermal management. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
TPS22990NDMLR - 10A, 5.5V, 3.9mOhm Load Switch | TI
The Texas Instruments TPS22990NDMLR is a 5.5 V, 10 A, 3.9 mOhm single-channel N-channel high-side load switch housed in a 10-pin WSON (3x2 mm) package, featuring an adjustable controlled turn-on, integrated power-good (PG) indicator, and quick output discharge (QOD) function. A load switch is a power distribution switch, a type of power management IC that sits between a supply rail and its load to gate power on and off, control inrush current, and isolate faults. In the system hierarchy, it belongs to the family of high-side switches used in power trees alongside hot-swap controllers, e-fuses, and DC-DC converters, enabling fine-grained power sequencing and rail management. Key differentiating features include an ultra-low 3.9 mOhm on-resistance, which minimizes both the voltage drop across the switch and conduction power loss at the full 10 A continuous current, and a wide 0.6 V to 5.5 V input voltage range that spans modern sub-1 V core rails up to standard 5 V rails. The adjustable slew rate (soft-start), set via an external capacitor, suppresses inrush current during turn-on, while the integrated PG output simplifies power-rail sequencing and monitoring without external supervisory circuitry. The N-channel MOSFET architecture avoids the body-diode conduction and rds(on) penalties of older P-channel designs at high current. Internal control logic drives the gate with a controlled ramp defined by the CT pin capacitor, and the QOD option actively discharges the output when the switch is disabled, preventing floating rails in multi-rail systems. ESD protection on the pins adds robustness during assembly and handling. Typical applications include SSD and storage power distribution, FPGA and processor core-rail sequencing, networking cards, battery-powered portable systems, and server backplane point-of-load switching, all of which benefit from low-loss high-current switching with controlled turn-on. Design consideration: at 10 A, conduction loss is approximately I2 x R, so PCB copper pour on the IN and OUT pins is essential for thermal management. This page synthesizes distributor pricing, same-family drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
TPS22991IBNRAAR - 5.5V 2.7A Load Switch UQFN-HR | Texas Instruments
The Texas Instruments TPS22991IBNRAAR is a 5.5V, 2.7A, 28 mOhm single-channel load switch with controlled slew rate, housed in a 4-pin UQFN-HR (RAA) package measuring just 0.85 mm x 0.75 mm with 0.4 mm pitch. The device integrates an N-channel MOSFET that operates over a 1.0V to 5.5V input voltage range and is characterized for operation from -55C to +125C, covering extreme-temperature and wide-temperature industrial designs. A load switch is a type of power management IC (power distribution switch) that gates a voltage rail on and off under logic control, protecting downstream circuitry from inrush current and enabling power sequencing. Within the power-management hierarchy, the TPS22991I family sits between a voltage regulator and a simple discrete MOSFET switch: it provides controlled turn-on without regulation of the rail voltage itself. Key features include a low on-resistance of 28 mOhm, which minimizes voltage drop and conduction loss at multi-ampere loads, and a controlled slew rate that limits inrush current when charging large bulk capacitance. The ON/OFF control input interfaces directly with low-voltage GPIO signals, allowing the switch to be driven by microcontrollers and processors operating well below the main rail voltage. Low shutdown leakage makes the device suitable for battery-powered designs where off-state quiescent draw must be minimized. Technically, the integrated N-channel pass element is driven by an internal charge-pump-free gate-drive scheme referenced to the input pin, with slew-rate control implemented through a controlled gate-drive ramp. This gives a predictable, monotonic output voltage ramp that avoids the sharp turn-on transients typical of uncontrolled discrete MOSFET switching. Typical applications include power-rail gating for battery-powered portable electronics, module power sequencing in processors and FPGAs, and load switching in industrial sensors operating over extended temperature ranges. The tiny 0.85 mm x 0.75 mm footprint suits densely packed wearables and IoT modules. Design consideration: verify the device pinout carefully. Unlike most single-channel load switches that use an IN-OUT-GND-EN ordering, the TPS22991I pinout is documented as special in TI's E2E forum, so confirm pin assignments against the manufacturer datasheet before layout. This page synthesizes distributor availability, 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.
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.
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.
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.