TPS2370PWG4 - IEEE 802.3af PoE PD Power Interface Switch | TI
MPN: TPS2370PWG4 ✓ فعالTPS2370PWG4 جائزہ
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.
کے لیے ڈراپ اِن متبادل TPS2370PWG4 — یکساں پیکیج، پن سے پن مطابقت پذیر۔ مختلف پیکیج والے پرزے جن کے لیے PCB دوبارہ کام درکار ہو، شامل نہیں ہیں۔
اس سیریز میں مختلف ورژن
اسی سیریز کے ماڈلز جو ڈراپ اِن مطابقت رکھتے ہیں TPS2370PWG4 (یکساں فارم فیکٹر اور فٹ پرنٹ) — میں مختلف Operating Temperature Range, Package, Function, Inrush Current Limiting, Standards Compliance.
TPS2370PW
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →TPS2370PWR
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →TPS2370PWPR
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
TPS2370PWG4 زیادہ سے زیادہ ریٹنگز اور برقی خصوصیات
| Standard Compliance | IEEE 802.3af |
| Topology / Function | PoE Powered Device (PD) interface switch and controller |
| Integrated Pass FET Rds(on) | 0.3 ohm |
| Nominal Input Voltage (PoE) | 48 V |
| Detection Signature Resistor | 25 kohm (integrated, four-quadrant) |
| Inrush Current Limit | Programmable (default 400 mA for 50 ms per IEEE 802.3af) |
| Power-Good (PG) Output | Open-drain, active-low after bulk charge complete |
| Power-Good Off (PG_OFF) Output | Open-drain status flag |
| Undervoltage Lockout (UVLO) | Adjustable via external resistor divider |
| تھرمل شٹ ڈاؤن | Yes (internal) |
| آپریٹنگ درجہ حرارت رینج | 0 C to +70 C |
| پیکیج | 8-TSSOP (PW) 4.40 mm body width |
| ماؤنٹنگ ٹائپ | Surface Mount |
| Terminal Finish | Nickel-palladium-gold |
| Max Seated Height | 1.2 mm |
| Lead Free / RoHS | Yes / Compliant (G4 suffix indicates Pb-free package) |
TPS2370PWG4 پن کنفیگریشن
| پن 1 | GND — Ground |
| پن 2 | VDD — 48 V PoE input supply |
| پن 3 | CTL — Control pin for inrush current limit programming |
| پن 4 | PG — Power Good (open drain) |
| پن 5 | PG_OFF — Power Good off flag (open drain) |
| پن 6 | RTN — Return / drain of internal pass FET |
| پن 7 | VBAT — Auxiliary supply input |
| پن 8 | AUX — Auxiliary drive output |
عام استعمالات
TPS2370PWG4 کے لیے موزوں ہے 6 ایپلیکیشنs: IP Desk Phones (VoIP), Wireless Access Points (Wi-Fi APs), IP Security Cameras / Surveillance, IoT Gateways and Smart-Sensor Hubs, PoE-Powered Thin Clients and POS Terminals, Industrial Sensors / Building Automation.
IP Desk Phones (VoIP)
The TPS2370PWG4's IEEE 802.3af compliance and integrated 0.3 ohm pass FET let an IP phone draw the full Class 0 budget (~12.95 W) over a single Cat-5 cable, eliminating a separate 48 V power brick. Designers sit the part between the magnetics and a 5 V / 12 V DC-DC, with the PG output sequencing the downstream converter on after bulk charge. Compared to a discrete hot-swap + FET solution, the TPS2370 saves three BOM parts and tightens the 25 kohm detection signature via internal precision resistors. In production IP-phone designs the 8-TSSOP footprint keeps the PoE front-end under roughly 5 x 7 mm, and the programmable inrush supports the larger 470 uF bulk caps common for audio-ringing energy storage.
تجویز کردہ
Wireless Access Points (Wi-Fi APs)
Enterprise Wi-Fi access points are routinely powered by 802.3af PoE to centralize cable runs, and the TPS2370PWG4 directly drives a 48 V-to-3.3 V or 5 V DC-DC chain from the RJ-45 input. The 0.3 ohm Rds(on) minimizes dissipation - at Class 0 power this yields roughly 0.6 W heating, easily sunk into the TSSOP-8 thermal pad on a 1 oz copper pour. PG sequencing prevents the radio's serializer/deserializer from enumerating until bulk-charge is complete, eliminating the brown-out seen when radio bring-up overlaps inrush. For APs with higher power budgets, the TPS2373 family offers PoE+ upgrade paths while retaining the same PoE detection topology.
تجویز کردہ
IP Security Cameras / Surveillance
The TPS2370PWG4 is widely used in IP camera front-ends where the camera must boot under 802.3af PoE only and survive accidental non-standard injectors. Its integrated detection resistor network and programmable inrush current limit provide robust hot-plug behavior in outdoor cabinets, and the part's PG output can hold off the heater/PTC thermostat circuit during capacitor charging. Powering the heater, IR illuminator and DSP directly from a single PoE cable simplifies installation by removing any 24 V AC wiring. The 0 C to +70 C commercial temperature rating suits most indoor IP-camera installations; outdoor housings should pair the TPS2370 with a heater and use industrial-grade downstream converters.
تجویز کردہ
IoT Gateways and Smart-Sensor Hubs
Industrial IoT gateways aggregate sensor traffic and are commonly powered by PoE to centralize cabling in building automation. The TPS2370PWG4 accepts the -48 V PoE supply, classifies cleanly into Class 1 or 2, then supplies a regulated 12 V rail for downstream non-isolated converters feeding the microcontroller and radio. Because the TPS2370 occupies only an 8-TSSOP footprint, designers can fit the PoE front-end plus the entire gateway electronics into a wall-plate housing. PG signaling lets the gateway firmware suppress sensor beacons during the bulk-charge sequence, avoiding spurious network registrations. For ultra-low-power IoT nodes, designers can power the whole node through a Class 1 (4 W) budget supported by the TPS2370PWG4.
تجویز کردہ
PoE-Powered Thin Clients and POS Terminals
Thin-client terminals and point-of-sale kiosks increasingly accept 802.3af PoE to centralize power in the closet, and the TPS2370PWG4 acts as the hot-swap front-end that handles detection, classification, and inrush. Its internal 0.3 ohm FET passes up to ~600 mA cleanly to a downstream 24 V or 12 V bus that supplies the terminal's processor and printer rails. PG_OFF can interrupt the convertor during hot-unplug events to prevent the terminal from corrupting files in mid-write. The TSSOP-8 footprint and lead-free NiPdAu finish simplify compliance audits for retail-IT hardware rollouts.
تجویز کردہ
Industrial Sensors / Building Automation
Building-automation sensors (CO2, occupancy, leak detectors) are routinely powered by 802.3af to avoid re-wiring, and the TPS2370PWG4 supplies a clean Class 0 budget that the sensor node distributes to a small DC-DC chain. Its adjustable UVLO lets designers gracefully power-down on PoE brown-out events before the sensor corrupts, and the PG pin holds the downstream regulator off until bulk voltage is stable. The 8-TSSOP footprint plus minimal external parts reduces bill-of-material cost, important for the very high unit volumes typical of office buildings. For hazardous-location or outdoor sensors, the part's nickel-palladium-gold finish ensures reliable operation in humid environments where standard tin terminations could creep.
تجویز کردہ
تجویز کردہ پروڈکٹس کا خلاصہ
کے لیے انجینئرنگ ریفرنس ڈیٹا TPS2370PWG4 — موازنہ، ڈیزائن رہنمائی، اور تعمیل کی معلومات۔
انتخاب کی گائیڈ
متبادلات کے ساتھ موازنہ
| پیرامیٹر | یہ پروڈکٹ | TPS2370PW | TPS2370PWR | TPS2370PWPR |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-TSSOP (PW) 4.40 mm | 8-TSSOP (PW) 4.40 mm - same | 8-TSSOP (PW) 4.40 mm - same | 8-TSSOP (PW) 4.40 mm - same |
| RoHS / Lead-Free | Pb-free G4 suffix | Non-Pb-free, Pb-bearing | Pb-free (PR suffix) | Pb-free |
| Integrated Pass FET Rds(on) | 0.3 ohm | 0.3 ohm | 0.3 ohm | 0.3 ohm |
| Standard Compliance | IEEE 802.3af | IEEE 802.3af | IEEE 802.3af | IEEE 802.3af |
| Detached Logic Output (PG / PG_OFF) | Open-drain PG and PG_OFF | Open-drain PG and PG_OFF | Open-drain PG and PG_OFF | Open-drain PG and PG_OFF |
| Programming of Inrush | Programmable via CTL | Programmable via CTL | Programmable via CTL | Programmable via CTL |
| Operating Temperature | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C |
اہم امتیازی خصوصیات
- Integrated 0.3 ohm pass FET (بمقابلہDiscreet hot-swap controller + external N-FET pair)
- Tightest internal detection signature (بمقابلہOlder TPS237x designs)
- PG and PG_OFF dual signaling (بمقابلہTPS23750/1 single PG-only designs)
ڈیزائن نوٹس
Place the 0.1 uF VDD-to-GND decoupling capacitor as close as possible to pins 1 and 2 of the TPS2370PWG4 (within 5 mm). Add a TVS diode such as SMAJ58CA across VDD-GND to clamp transients from the Ethernet magnetics. The TSSOP-8 pad should be on a 1 oz copper pour of at least 0.4 sq cm to keep the internal FET within thermal limits at the 12.95 W Class-0 ceiling; the package theta_JA is approximately 110 C/W on JEDEC JESD51 1-oz 2-layer board, limiting continuous current to about 400 mA without airflow.
Estimated: at Class-0 full power (12.95 W), the internal 0.3 ohm FET dissipates roughly Iout^2 x 0.3 ohm. With Iout = 350 mA, that is ~37 mW; the TSSOP-8 with a small copper pour easily absorbs this dissipation. During the 50 ms inrush (400 mA), peak dissipation is I^2 x R = (0.4)^2 x 0.3 = 48 mW, which is well within the thermal envelope. To support bulk caps larger than 180 uF (the IEEE 802.3af timing-based limit), reduce inrush via the CTL pin resistor to roughly 100 mA, letting a 470 uF bulk charge without tripping the upstream PSE.
Do not place an inrush resistor upstream of the TPS2370PWG4 - the device is designed to be the only hot-swap element, and any external resistance desensitizes detection. Avoid grounding pin 1 via a long trace; place a low-ESR ceramic bypass (0.1 uF plus 10 uF) within 2 mm. The 'G4' suffix parts may be sourced from distributors with legacy date codes, so verify the NiPdAu finish and Pb-free reflow profile before use in consumer RoHS regions.
تعمیل کی معلومات
RoHS compliant (G4 suffix indicates Pb-free NiPdAu finish per partstack.com terminal-finish data). Halogen-free per TI material declaration. Not AEC-Q100 qualified - choose TPS2370-Q1 / TPS2372-Q1 for automotive PoE applications.
