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Texas Instruments TPS23785BPWPR
- Part No.:
- TPS23785BPWPR
- Manufacturer:
- Texas Instruments
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 24-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS23785BPWPR.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 24HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,486
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Product details
Overview
TPS23785BPWPR from Texas Instruments is a high-power IEEE 802.3at Type 2 PoE powered device (PD) interface and non-isolated DC-DC controller IC. It integrates a 100-V, 0.5-Ω hot-swap MOSFET, dual complementary gate drivers (GATE/GAT2), programmable dead time, and enhanced classification circuitry. It supports up to 30-W input power and operates across –40°C to 125°C junction temperature for surveillance cameras and VoIP telephones.
For engineers reviewing the TPS23785BPWPR datasheet, TPS23785BPWPR pinout, TPS23785BPWPR application, or TPS23785BPWPR equivalent, this page delivers verified specifications including 78% max duty cycle, 253 kHz typical switching frequency, 0.55 V current-sense threshold, 15 V VC UVLO with 6.5 V hysteresis, and TSSOP-24 PowerPAD™ package thermal metrics.
Technical Context
The TPS23785BPWPR implements a two-event physical-layer classification engine compliant with IEEE 802.3at for Type 2 PSE detection and supports adapter ORing via APD-controlled hot-swap disable. Its DC-DC control section features current-mode PWM with internal slope compensation (155 mV), programmable blanking (55 ns default), and softstart (3.9 ms typical).
It provides dual gate drivers with independently programmable dead time (via DT pin), synchronous rectification support for flyback topologies, and bootstrap startup sourcing from VDD1 to VC. The controller's 78% maximum duty cycle and 78% duty cycle limit are enforced at the GATE output under full-load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Input Voltage | 57 V - Supports full IEEE 802.3at PoE voltage range with margin for transients. |
| Hotswap RDS(on) | 0.43 Ω typical - Enables low-loss 825 mA continuous RTN current at TJ ≤125°C. |
| VC UVLO Threshold | 15 V rising / 6.5 V hysteresis - Ensures stable DC-DC bias startup after PoE power-up. |
| Switching Frequency | 253 kHz typical - Optimized for efficiency in non-isolated flyback converters with secondary SR. |
| Current Sense Threshold | 0.55 V - Sets peak switch current limit; used with external RCS for precise overcurrent protection. |
| Duty Cycle Limit | 78% max - Prevents transformer saturation and ensures safe operation in continuous conduction mode. |
| Operating Temp Range | –40°C to 125°C - Validated for industrial and outdoor IP camera deployments. |
| Package Thermal Resistance | θJCbot = 1.8 °C/W - Achieved via exposed PowerPAD™ tied to VSS, enabling high-power dissipation. |
Pinout & Package
TSSOP-24 PowerPAD™ package with 0.65 mm pitch and thermally enhanced exposed pad (PAD = VSS). Requires PCB copper area for heatsinking and meets JEDEC MO-153 mechanical standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P1, P2 | VB Tie Points | Connect directly to VB rail to supply gate driver pull-up and optocoupler bias current. |
| CTL | PWM Control Loop Input | Voltage feedback node; 0–1.5 V disables switching; >1.5 V modulates peak current via internal 100 kΩ divider. |
| GATE / GAT2 | Complementary Gate Drivers | Drive primary and secondary MOSFETs in synchronous flyback; timing controlled by DT resistor. |
| CS | Current Sense Input | Monitors high-side RCS voltage; 0.55 V threshold triggers cycle-by-cycle current limiting. |
| RTN | Hotswap Output Terminal | Drain of integrated 100-V MOSFET; connects to PD load return; supports 825 mA continuous current. |
| ARTN / COM | Analog Reference / Gate Driver Return | Low-noise analog ground plane; must be tied to RTN locally only if using single-supply configuration. |
| APD | Adapter Priority Enable | Raising above 1.5 V disables PoE hotswap, forces T2P active, and enables external adapter priority. |
| T2P | Type 2 PSE Indicator | Active-low open-drain output signaling successful IEEE 802.3at hardware classification or APD activation. |
Key Features
| Feature | Design Value |
|---|---|
| IEEE 802.3at Type 2 Classification | Two-event detection + programmable class (0–4) via single CLS-to-VSS resistor; supports 25.5 W PD power. |
| Adapter ORing Support | APD pin enables seamless switchover to external VDD1-RTN adapter without firmware or external logic. |
| Dual Synchronous Gate Drivers | GATE and GAT2 with 50 ns typical dead time (RDT = 24.9 kΩ); supports secondary-side synchronous rectification. |
| Programmable Switching Frequency | 50–937 kHz via FRS-to-ARTN resistor; allows optimization for EMI, efficiency, and transformer size. |
| Robust Hotswap Protection | 100-V absolute max rating, foldback current limit (12.3 V), and thermal shutdown (145°C turnoff). |
| Bootstrap Startup Architecture | VDD1-to-VC current source enables converter start before auxiliary winding becomes active; tST = 75 ms typical. |
Applications
| Surveillance Cameras | VoIP Telephones |
|---|---|
|
Use Scenario: Outdoor PTZ camera with IR illumination, motor control, and video streaming over PoE. IC Role / Device Role / Timing Role: Primary PD interface and DC-DC controller managing 24-V rail generation from 48-V PoE input. Use Value: Integrated hotswap MOSFET and dual gate drivers eliminate discrete components; 30-W capability powers full-feature cameras without external boost stages. |
Use Scenario: Enterprise-grade VoIP phone with LCD, speakerphone, and Gigabit Ethernet PHY. IC Role / Device Role / Timing Role: IEEE 802.3at-compliant PD controller delivering regulated 3.3-V/5-V rails with fast transient response. Use Value: Programmable classification ensures correct PSE power allocation; APD enables local wall adapter fallback during PoE outage. |
| Wireless Access Points | RFID Readers |
|
Use Scenario: Dual-band 802.11ac AP with integrated RF front-end and USB host for client bridging. IC Role / Device Role / Timing Role: High-efficiency non-isolated flyback controller powering RF and baseband sections from PoE. Use Value: 78% max duty cycle and 253 kHz switching enable compact magnetics; thermal metrics support fanless enclosure design. |
Use Scenario: Industrial UHF RFID reader mounted on factory floor with metal enclosure and long-range antenna. IC Role / Device Role / Timing Role: Robust PoE PD interface handling voltage surges and ambient temperatures up to 70°C ambient. Use Value: 100-V MOSFET rating and –40°C to 125°C junction range ensure reliability in electrically noisy, thermally demanding environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PoE PD interface and DC-DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT4275AIMSE#PBF | Single-channel gate driver; no GAT2 output; supports IEEE 802.3af/at but lacks APD-controlled adapter ORing. | Best suited for simpler 15-W PDs without secondary-side synchronous rectification or adapter fallback needs. | Select when cost sensitivity outweighs need for dual-MOSFET control or seamless adapter priority. |
| MAX5984AETX+T | Integrated 100-V MOSFET with 0.65 Ω RDS(on); fixed 250 kHz oscillator; no programmable dead time or FRS sync capability. | Targeted at basic 802.3af/at PDs where design reuse of legacy MAX598x layouts is prioritized over topology flexibility. | Choose for drop-in replacement in existing MAX598x-based designs requiring minimal layout change. |
Compared with LT4275AIMSE#PBF and MAX5984AETX+T, the TPS23785BPWPR uniquely combines dual gate drivers with APD-enabled adapter ORing and programmable dead time-enabling higher-efficiency flyback designs with robust power-source arbitration.
Availability
TPS23785BPWPR is available at Aetrix Electronics and suitable for surveillance cameras, VoIP telephones, and wireless access points requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TPS23785BPWPR 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 specializing in analog, embedded processing, and connectivity solutions with over 50 years of power management innovation.
The TPS23785B product line was designed specifically for high-efficiency, high-power PoE-powered devices requiring integrated hotswap control, adaptive DC-DC regulation, and seamless dual-power-source arbitration.
FAQ
What is the maximum continuous current supported by the TPS23785BPWPR hotswap MOSFET?
The TPS23785BPWPR hotswap MOSFET supports 825 mA continuous current at TJ ≤125°C per the recommended operating conditions. This is validated with 0.43 Ω typical RDS(on) and accounts for thermal derating in real-world PCB layouts with adequate copper area on the PowerPAD™.
How does the TPS23785BPWPR implement IEEE 802.3at Type 2 classification?
The TPS23785BPWPR performs two-event physical-layer classification per IEEE 802.3at using the CLS pin and internal regulator. A resistor from CLS to VSS sets class current (e.g., 63.4 Ω for Class 4), and the T2P pin asserts low upon successful detection-enabling system-level Type 2 PSE identification in the TPS23785BPWPR.
Can the TPS23785BPWPR operate without an external adapter when APD is asserted?
No-the TPS23785BPWPR requires an external adapter connected between VDD1 and RTN to sustain operation when APD is raised above 1.5 V. Asserting APD disables the internal hotswap MOSFET and forces power sourcing exclusively from the external adapter; PoE power is cut off.
What is the purpose of the DT pin on the TPS23785BPWPR?
The DT pin on the TPS23785BPWPR programs dead time between GATE and GAT2 outputs using an external resistor to ARTN. With RDT = 24.9 kΩ, typical dead time is 50 ns-ensuring safe commutation in synchronous flyback topologies. Connecting DT to VB disables GAT2 entirely.
Does the TPS23785BPWPR support synchronization to an external clock signal?
Yes-the FRS pin on the TPS23785BPWPR accepts ac-coupled synchronization pulses above its free-running frequency (e.g., >278 kHz). When used, short, noise-immune routing is required; the pin remains high-impedance and supports both frequency programming and external clock injection for EMI reduction.
TPS23785BPWPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Controller (PD), DC/DC
- Number of Channels:
- 1
- Power - Max:
- 30 W
- Internal Switch(s):
- Both
- Auxiliary Sense:
- No
- Standards:
- 802.3at (PoE+), 802.3af (PoE)
- Voltage - Supply:
- 0V ~ 57V
- Current - Supply:
- 960µA
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-HTSSOP
TPS23785BPWPR FAQ
1.How can I place an order for TPS23785BPWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS23785BPWPR 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 TPS23785BPWPR reliable?
The price and inventory of TPS23785BPWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS23785BPWPR is usually 5 days.
3.What payment methods are accepted for TPS23785BPWPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS23785BPWPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS23785BPWPR?
TPS23785BPWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS23785BPWPR 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 TPS23785BPWPR?
For technical support, including TPS23785BPWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS23785BPWPR requirements.
6.How does Aetrix verify that TPS23785BPWPR is sourced from the original manufacturer or authorized distributors?
All TPS23785BPWPR 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 TPS23785BPWPR meets industry standards.
7.What is the process for return or replacement of TPS23785BPWPR?
All TPS23785BPWPR units undergo pre-shipment inspection (PSI). If there is an issue with TPS23785BPWPR, 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 TPS23785BPWPR part is unused and in its original packaging.
Return procedure for TPS23785BPWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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