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Texas Instruments TPS23770PWPR
- Part No.:
- TPS23770PWPR
- Manufacturer:
- Texas Instruments
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS23770PWPR.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,740
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Product details
Overview
TPS23770PWPR from Texas Instruments is an integrated IEEE 802.3af Power over Ethernet (PoE) Powered Device (PD) interface and primary-side DC/DC PWM controller in a TSSOP-20 PowerPAD™ package. It features a 100 V, 0.6 Ω internal pass MOSFET, fixed 140 mA inrush limit, legacy UVLO thresholds (34.1 V rise / 30.5 V fall), and supports flyback, forward, and nonsynchronous buck topologies for PoE-PD applications including VoIP phones and security cameras.
For engineers reviewing the TPS23770PWPR datasheet, TPS23770PWPR pinout, TPS23770PWPR application, or TPS23770PWPR equivalent, key selection considerations include its legacy-compatible undervoltage lockout behavior, integrated PoE detection/classification circuitry, primary-side current-mode DC/DC control with programmable frequency (90–565 kHz), and thermal shutdown at 140°C - all critical for robust, standards-compliant PoE front-end design.
Technical Context
The TPS23770PWPR implements full IEEE 802.3af PoE functionality - detection (24.9 kΩ signature), classification (via RCLASS resistor), legacy UVLO (34.1 V turn-on / 30.5 V turn-off), and 140 mA inrush limiting - alongside a current-mode PWM controller with 50% duty cycle limit, leading-edge blanking, and true voltage-output error amplifier (1.50 V FB reference). Its internal 5 V VBIAS and 10 V AUX regulators power control circuitry and gate drive.
It supports isolated and non-isolated topologies via flexible external MOSFET control, uses SEN/SENP for high-side sensing in buck configurations, and enables optocoupler feedback via MODE pin configuration. The device integrates sequencing between PoE handshaking and DC/DC startup, with hiccup-mode fault protection triggered by overcurrent (0.765 V RSP–RSN threshold) or thermal events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| UVLO Threshold (Rising) | 34.1 V - Enables operation only after PoE PSE applies sufficient voltage, compatible with legacy systems. |
| UVLO Threshold (Falling) | 30.5 V - Maintains operation during brief input dips, preventing nuisance shutdowns in noisy PoE environments. |
| Internal Pass MOSFET RDS(on) | 0.6 Ω - Reduces conduction loss and heat generation in the PoE input stage without external FET. |
| FB Regulation Voltage | 1.50 V ±30 mV - Sets precise output voltage in feedback loop; used with external resistive divider for stable DC/DC regulation. |
| Switching Frequency Range | 90–565 kHz - Programmable via FREQ pin resistor; allows optimization of magnetics size, efficiency, and EMI performance. |
| Thermal Shutdown Temp | 140°C - Protects against sustained overload or poor heatsinking; 17°C hysteresis ensures reliable recovery. |
| Operating Ambient Temp | –40°C to +85°C - Qualified for industrial and outdoor PoE endpoints such as wireless access points and IP cameras. |
Pinout & Package
TSSOP-20 PowerPAD™ package with exposed thermal pad (internally connected to VSS) for enhanced thermal dissipation; 0.65 mm pitch, 6.5 mm × 4.4 mm body size.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TMR | Soft-start & hiccup timer control | Capacitor to RTN sets soft-start ramp time and fault restart interval; pull to RTN disables converter. |
| FB | Error amplifier inverting input | Connected to voltage divider from output; regulates DC/DC output to 1.50 V reference when in closed loop. |
| COMP | Error amplifier output / PWM comparator input | Interface point for loop compensation; drives external optocoupler when MODE = VBIAS. |
| SEN | Level translator negative sense input | Enables high-side sensing in buck converters; regulated 1.5 V below SENP for accurate feedback referencing. |
| NC | No connect | Unused pin; no internal connection; must remain unconnected. |
| SENP | Level translator positive reference input | Connected to output rail in buck designs; enables sensing above RTN without level-shifting components. |
| VDD | PoE input supply | Accepts 0–67 V PoE input; powers internal logic and bias circuits after detection/classification. |
| DET | PoE detection signature | With 24.9 kΩ to VDD, forms valid 25 kΩ Class 0 signature for PSE detection phase. |
| CLASS | PoE classification current source | Sinks current through external RCLASS resistor (e.g., 255 Ω for Class 4) to signal power class to PSE. |
| VSS | PoE ground reference | Common return for PoE circuitry; internally connects to PowerPAD for thermal conduction. |
| FREQ | Oscillator frequency programming | Resistor to RTN (30–300 kΩ) sets switching frequency; enables reuse of existing magnetics across designs. |
| BL | Current-sense blanking selector | Configures blanking delay (open = min, RTN = +70 ns, VBIAS = +105 ns) to suppress gate-drive transients. |
| VBIAS | 5 V internal bias regulator output | Powers internal circuitry and optocoupler LED; requires 0.08–1.5 µF bypass capacitor to RTN. |
| MODE | Error amplifier enable/disable | Tie to RTN to enable internal error amp; tie to VBIAS to disable and allow direct optocoupler-to-COMP interface. |
| AUX | 10 V gate driver supply | Provides gate drive voltage; accepts up to 16 V input; requires ≥0.8 µF low-ESR capacitor to COM. |
| GATE | MOSFET gate driver output | Drives external N-channel MOSFET; 0.05 V low-state and 11.9 V high-state swing at 5 mA load. |
| COM | Gate driver return | Separate analog return for GATE driver; must be tied to RSN and RTN on PCB to minimize noise coupling. |
| RSN | Current-sense reference / quiet ground | Low-noise analog ground for RSP; must be tied to RTN and COM for accurate peak-current sensing. |
| RSP | Current-sense positive input | Connects to high side of sense resistor; triggers current limit when RSP–RSN exceeds 0.50 V (typ). |
| RTN | PoE output return / converter input rail | Switched negative output from PoE section; serves as DC/DC input negative rail and system ground reference. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 802.3af PoE PD interface | Eliminates need for discrete detection, classification, and inrush circuits - reduces BOM count and layout area. |
| Legacy UVLO thresholds (34.1 V / 30.5 V) | Ensures compatibility with older PSEs that do not support standard 39.3 V / 30.5 V thresholds, extending field deployment options. |
| Programmable switching frequency (90–565 kHz) | Allows optimization of transformer size, core losses, and EMI filtering without changing IC - accelerates design iteration. |
| SEN/SENP level translator | Enables direct high-side output voltage sensing in buck converters without external op-amps or isolated supplies. |
| Hiccup-mode overcurrent protection | Shuts down converter on repeated overcurrent faults (e.g., short-circuit), then auto-restarts - prevents thermal runaway. |
| PowerPAD™ thermal package | Reduces junction-to-board thermal resistance to 1.4°C/W, enabling higher power density in compact PoE endpoint designs. |
Applications
| VoIP Phones | Wireless Access Points |
|---|---|
Use Scenario: Powered via Category 5 Ethernet cable from centralized PoE switch in enterprise office networks. IC Role / Device Role: Primary PoE PD interface and DC/DC controller converting 48 V PoE input to regulated 3.3 V/5 V rails. Use Value: Enables single-cable deployment with no local AC adapter; legacy UVLO ensures interoperability with installed base of midspan PSEs. | Use Scenario: Outdoor or ceiling-mounted 802.11n/ac access point requiring reliable remote power and thermal resilience. IC Role / Device Role: Handles PoE detection/classification and generates isolated 12 V for RF front-end and 3.3 V for SoC via flyback topology. Use Value: Integrated 100 V pass FET withstands PoE surge transients; PowerPAD™ package sustains operation at 85°C ambient. |
| IP Security Cameras | Networked Digital Signage |
Use Scenario: High-resolution PTZ camera with IR illumination and video streaming, deployed in retail or transportation infrastructure. IC Role / Device Role: Provides PoE-PD front end and buck-derived 12 V for motor control and 5 V for image sensor processing. Use Value: Current-mode control with blanking (BL-selectable) rejects EMI from stepper drivers; 140 mA inrush limit avoids PSE tripping during cold start. | Use Scenario: Large-format display powered over Ethernet in digital advertising or corporate lobbies, requiring stable long-duration operation. IC Role / Device Role: Delivers continuous 24 V output from PoE input using forward converter topology with synchronous rectification. Use Value: Thermal shutdown (140°C) and hiccup protection prevent field failures under sustained load; MODE pin enables optocoupler feedback for tight output regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PoE PD controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS23750PWPR | Standard UVLO (39.3 V rise / 30.5 V fall); otherwise functionally identical pinout and feature set. | Designed for new deployments with IEEE-compliant PSEs; lacks legacy UVLO compatibility. | Select TPS23750PWPR for greenfield installations where PSE supports 39.3 V turn-on; verify PSE revision before substitution. |
| LT4275AIMSE#TRPBF | Linear Technology (Analog Devices) IEEE 802.3at/af PD interface with integrated DC/DC controller; different pinout, no internal pass FET, supports higher power classes. | Targets 802.3at (PoE+) up to 30 W; requires external MOSFET; offers enhanced surge protection and I²C monitoring. | Choose LT4275 for PoE+ applications or where programmable current limit and telemetry are required; redesign needed due to non-pin-compatible layout. |
Compared with TPS23770PWPR, TPS23750PWPR offers standard 802.3af UVLO but no legacy support, while LT4275AIMSE#TRPBF provides PoE+ capability and telemetry at the cost of external FET requirement and board redesign - making TPS23770PWPR optimal for cost-sensitive, legacy-PSE-compatible PoE-PD designs.
Availability
TPS23770PWPR is available at Aetrix Electronics and suitable for VoIP phones, IP security cameras, and wireless access points requiring stable component supply, industrial temperature operation (–40°C to +85°C), and IEEE 802.3af compliance with legacy PSE interoperability.
Supply support for TPS23770PWPR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader delivering analog and embedded processing solutions, with deep expertise in power management and connectivity ICs.
The TPS237xx product line delivers integrated PoE-PD front ends with DC/DC controllers, designed specifically for space-constrained, thermally demanding Ethernet-powered endpoints in enterprise, industrial, and surveillance applications.
FAQ
What is the key functional difference between TPS23770PWPR and TPS23750PWPR?
The TPS23770PWPR features legacy undervoltage lockout (UVLO) thresholds (34.1 V turn-on / 30.5 V turn-off), whereas the TPS23750PWPR uses standard IEEE 802.3af UVLO (39.3 V / 30.5 V). All other electrical characteristics, pinout, and packaging are identical. This makes TPS23770PWPR suitable for interoperability with older midspan PSEs that do not meet the full 39.3 V specification, while TPS23750PWPR targets newer, fully compliant infrastructure. Both share the same TSSOP-20 PowerPAD™ footprint and require identical external components.
How does the BL pin affect current-sense timing in TPS23770PWPR?
The BL pin on the TPS23770PWPR selects blanking duration for the current-sense comparator to suppress false triggering from gate-drive and diode-recovery transients. With BL open, blanking is minimized (baseline delay); tying BL to RTN adds ~70 ns, and tying BL to VBIAS adds ~105 ns. This adjustment is critical in topologies with high parasitic ringing (e.g., flyback with fast diodes) and directly impacts stability and fault immunity. The TPS23770PWPR datasheet specifies these values under recommended operating conditions and confirms they hold across –40°C to +125°C junction temperature.
Can TPS23770PWPR support isolated DC/DC topologies, and what pins enable this?
Yes, the TPS23770PWPR supports isolated topologies including flyback and forward converters. Isolation is enabled via the COMP and MODE pins: when MODE is tied to VBIAS, the internal error amplifier is disabled, allowing an external optocoupler to inject feedback directly into the COMP node. The FB pin is then tied to RTN. This configuration decouples regulation from the primary side and permits secondary-side voltage sensing. The TPS23770PWPR's current-mode architecture and 50% duty cycle limit further enhance stability in isolated designs, as confirmed in TI's SLVS590B datasheet Figure 40 and Section 8.3.3.
What thermal management provisions does TPS23770PWPR include, and how is the PowerPAD™ used?
The TPS23770PWPR incorporates thermal shutdown at 140°C with 17°C hysteresis and relies on its PowerPAD™ - an exposed copper pad on the underside of the TSSOP-20 package - for thermal conduction. The PowerPAD™ is internally connected to VSS and must be soldered to a large PCB copper pour (preferably multi-layer with thermal vias) to achieve the specified θJP = 1.4°C/W. TI's recommended layout (SLMA002) shows minimum 250 mm² pad area with ≥8 thermal vias (0.3 mm diameter) to inner ground planes. This thermal path is essential to sustain 1.2 W maximum power dissipation at 85°C ambient, as documented in the Dissipation Ratings Table of the TPS23770PWPR datasheet.
Does TPS23770PWPR require external components for PoE detection and classification, and if so, which ones?
Yes, the TPS23770PWPR requires two external passive components for full IEEE 802.3af compliance: a 24.9 kΩ ±1% resistor (RDET) between DET and VDD to establish the valid 25 kΩ detection signature, and a precision resistor (RCLASS) between CLASS and VSS to set the device's power class (e.g., 255 Ω for Class 4). These values are explicitly specified in the TPS23770PWPR datasheet's Electrical Characteristics tables and Figure 1. No additional active components are needed - the detection current, classification current, and UVLO functions are fully integrated, reducing total solution size versus discrete implementations.
TPS23770PWPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Controller (PD), DC/DC
- Number of Channels:
- 1
- Power - Max:
- 12.95 W
- Internal Switch(s):
- Both
- Auxiliary Sense:
- No
- Standards:
- 802.3af (PoE)
- Voltage - Supply:
- 0V ~ 67V
- Current - Supply:
- 1mA
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
TPS23770PWPR FAQ
1.How can I place an order for TPS23770PWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS23770PWPR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TPS23770PWPR reliable?
The price and inventory of TPS23770PWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS23770PWPR is usually 5 days.
3.What payment methods are accepted for TPS23770PWPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS23770PWPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS23770PWPR?
TPS23770PWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS23770PWPR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TPS23770PWPR?
For technical support, including TPS23770PWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS23770PWPR requirements.
6.How does Aetrix verify that TPS23770PWPR is sourced from the original manufacturer or authorized distributors?
All TPS23770PWPR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TPS23770PWPR meets industry standards.
7.What is the process for return or replacement of TPS23770PWPR?
All TPS23770PWPR units undergo pre-shipment inspection (PSI). If there is an issue with TPS23770PWPR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TPS23770PWPR part is unused and in its original packaging.
Return procedure for TPS23770PWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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