TPS2370PWG4 - IEEE 802.3af PoE PD Power Interface Switch | TI
部品番号: TPS2370PWG4 ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.55 | $25.50 |
| 100 | $2.18 | $218.00 |
| 500 | $1.93 | $965.00 |
| 1,000 | $1.71 | $1,710.00 |
| 2,500 | $1.52 | $3,800.00 |
TPS2370PWG4 概要
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.
ドロップイン代替品: TPS2370PWG4 — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: TPS2370PWG4 （同一形状・フットプリント） — 相違点: Operating Temperature Range, Package, Function, Inrush Current Limiting, Standards Compliance.
クイック比較ツール — 並列比較する代替部品を選択:
TPS2370PW
✅ ドロップイン✓ 在庫あり
$1.49 / 個
データシートを見る →TPS2370PWR
✅ ドロップイン✓ 在庫あり
$1.5 / 個
データシートを見る →TPS2370PWPR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
TPS2370PWG4 最大定格＆電気的特性
| 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 |
| 熱シャットダウン | Yes (internal) |
| 動作温度範囲 | 0 C to +70 C |
| パッケージ | 8-TSSOP (PW) 4.40 mm body width |
| 実装タイプ | 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 ピン構成
| ピン 1 | GND — Ground |
| ピン 2 | VDD — 48 V PoE input supply |
| ピン 3 | CTL — Control pin for inrush current limit programming |
| ピン 4 | PG — Power Good (open drain) |
| ピン 5 | PG_OFF — Power Good off flag (open drain) |
| ピン 6 | RTN — Return / drain of internal pass FET |
| ピン 7 | VBAT — Auxiliary supply input |
| ピン 8 | AUX — Auxiliary drive output |
主な用途
TPS2370PWG4 の用途: 6 件s: 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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: TPS2370PWG4 — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | 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 |
主な差別化要因
- Integrated 0.3 ohm pass FET （vs Discreet hot-swap controller + external N-FET pair)
- Tightest internal detection signature （vs Older TPS237x designs)
- PG and PG_OFF dual signaling （vs TPS23750/1 single PG-only designs)
設計ノート
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.
コンプライアンス情報
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.
