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Texas Instruments TPS23753PW
- Part No.:
- TPS23753PW
- Manufacturer:
- Texas Instruments
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS23753PW.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,438
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Product details
Overview
TPS23753PW from Texas Instruments is an IEEE 802.3at-compliant Power over Ethernet (PoE) powered device (PD) interface and current-mode isolated dc/dc controller in a 14-pin TSSOP package. It integrates a 100 V, 0.7 Ω hotswap MOSFET, supports 13 W Type 1 PD operation, delivers 5 V VB bias rail, and features programmable 223–273 kHz switching frequency with synchronization capability - used in VoIP phones and security cameras requiring PoE-powered isolated flyback converters.
For engineers reviewing the TPS23753PW datasheet, TPS23753PW pinout, TPS23753PW application, or TPS23753PW equivalent, key selection criteria include PoE classification resistor programming (RCLS), adapter ORing support via APD pin, thermal shutdown at 135–155°C, startup time under 175 ms with 22 µF VC capacitor, and robust 15 kV system-level ESD rating.
Technical Context
The TPS23753PW implements dual-function control: its PoE interface handles IEEE 802.3at detection (62–66.5 µA signature current), classification (programmable Class 0–3 via CLS resistor), and hotswap regulation (35 V UVLO_R, 4.55 V hysteresis); simultaneously, its dc/dc controller provides bootstrap-startup current sourcing (2.5–6.0 mA into VC), slope-compensated current-mode PWM (VCSMAX = 0.55 V typ), and gate drive (0.46 A source / 0.79 A sink).
It supports input voltage ranges of 0–57 V on VDD/VDD1, operates from –40°C to 125°C junction temperature, and enables adapter ORing via APD pin (1.5 V threshold) and BLNK-programmable blanking (35–75 ns). The integrated 5 V VB rail powers external optocouplers, while VC (8.65–9.3 V UVLO) supplies internal gate driver and bias circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PoE Compliance | IEEE 802.3at Type 1 (13 W PD), supports full detection/classification/maintain-power-signature sequence |
| Hotswap MOSFET | 100 V rated, 0.7 Ω typical RDS(on), 450 mA current limit, foldback threshold at 12.3 V |
| Switching Frequency | 223–273 kHz (programmable via FRS resistor), synchronizable to external clock |
| VB Output | 5.10 V ±2.5%, 5 mA max load, used for optocoupler bias and control circuitry |
| VC UVLO | 9.0 V nominal turn-on with 3.5 V hysteresis - ensures stable bootstrap startup before converter operation |
| Current Sense Threshold | VCSMAX = 0.55 V (typ), defines peak primary current limit in isolated flyback designs |
| ESD Rating | 15 kV contact / 8 kV air system-level per EN61000-4-2 - validated on TPS23753EVM-001 evaluation module |
Pinout & Package
Packaged in a 14-pin TSSOP (PW), the TPS23753PW uses a thermally enhanced layout optimized for PoE PD board space constraints and thermal dissipation in sealed enclosures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CTL | PWM control loop input | Voltage feedback node; duty cycle modulated by voltage relative to 1.5 V ZDC threshold |
| 2 VB | 5 V regulated bias rail output | Supplies optocoupler LED and low-power control logic; requires 0.1 µF bypass to RTN |
| 3 CS | Current sense comparator input | Monitors high-side sense resistor; triggers GATE turn-off when >0.55 V |
| 4 VC | Controller bias supply | Starts up via internal current source from VDD1; powers gate driver directly; needs ≥0.22 µF ceramic cap |
| 5 GATE | MOSFET gate driver output | 0.46 A source / 0.79 A sink capability drives external N-channel MOSFET in flyback primary |
| 6 RTN | Converter return & hotswap drain | Common reference for dc/dc controller and PoE pass device; connects internally to hotswap MOSFET drain |
| 7 VSS | PoE input return | Clamped to RTN via hotswap diode; reference for PoE detection/classification circuits |
| 8 VDD1 | Startup current source input | Primary source for VC charging during bootstrap; tied to VDD in most designs |
| 9 VDD | PoE positive input rail | Derived from PoE source; bypassed with 0.1 µF X7R capacitor to VSS per IEEE 802.3 standard |
| 10 DEN | Detection signature enable | 24.9 kΩ pull-up to VDD generates compliant 25 kΩ detection resistance; pulled to VSS disables hotswap |
| 11 CLS | Classification current output | Drives resistor-to-VSS to set IEEE class (e.g., 1270 Ω = Class 0, 63.4 Ω = Class 3) |
| 12 APD | Adapter priority disable | 1.5 V threshold disables internal hotswap when external adapter is present - enables ORing |
| 13 BLNK | Current-sense blanking control | Connect to RTN for fixed 52 ns blanking; resistor sets programmable delay (35–75 ns) |
| 14 FRS | Frequency setting/sync input | Resistor-to-RTN sets free-running frequency; short AC pulses enable external sync above 273 kHz |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PoE + DC/DC Controller | Single-chip solution eliminates discrete hotswap FET, controller IC, and bias supply - reduces BOM count by ≥7 components |
| Adapter ORing Support | APD pin enables seamless switchover between PoE and 12 V adapter without external diodes or controllers |
| Bootstrap Startup | Internal switched current source charges VC from VDD1 - avoids power-wasting pull-up resistors and enables cold-start from 10.2 V |
| Programmable Blanking | BLNK pin allows precise tuning of current-sense delay (35–75 ns) to suppress gate-drive turn-on spikes in high-dV/dt flyback designs |
| Thermal Protection | 145°C nominal shutdown with 20°C hysteresis prevents latch-up during sustained overload or poor heatsinking |
Applications
| VoIP Telephones | Wireless Access Points |
|---|---|
Use Scenario: Powered via Category 5e Ethernet cable from PoE switch in enterprise office deployment. IC Role / Device Role / Timing Role: TPS23753PW acts as PoE PD interface and isolated flyback controller - manages detection/classification, regulates 5 V/3.3 V rails, and maintains MPS. Use Value: Enables single-cable deployment with no local AC adapter; 13 W budget supports dual-band Wi-Fi radios and voice codec processing. |
Use Scenario: Ceiling-mounted 802.11ac access point drawing peak power during client association bursts. IC Role / Device Role / Timing Role: TPS23753PW controls hotswap MOSFET turn-on timing and implements current-mode PWM with slope compensation for stable 24 V output. Use Value: Programmable blanking (via BLNK) prevents false current-limit triggering during RF transmit transients - improves reliability under RF noise. |
| IP Security Cameras | Industrial IoT Gateways |
Use Scenario: Outdoor PTZ camera with IR illumination requiring PoE+ power and local 12 V adapter backup. IC Role / Device Role / Timing Role: TPS23753PW performs adapter ORing via APD pin - automatically switches to 12 V adapter if PoE fails or drops below 35 V. Use Value: Eliminates need for external power-path controller; maintains video stream during PoE brownouts using same PCB footprint. |
Use Scenario: DIN-rail mounted gateway aggregating Modbus sensors and reporting via cellular/LTE link. IC Role / Device Role / Timing Role: TPS23753PW serves as primary PoE PD controller with synchronized FRS input - aligns switching to external clock to reduce EMI in dense industrial cabinets. Use Value: Synchronization capability lowers conducted emissions by 8–12 dB compared to free-running operation - simplifies EMC certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PoE PD controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT4275AIMSE#PBF | IEEE 802.3at Type 2 (30 W) capable; requires external dc/dc controller; no integrated gate driver | Supports higher-power PDs (e.g., PTZ cameras with heaters); lacks built-in flyback controller | Choose LT4275AIMSE#PBF when >13 W PoE budget is required and discrete dc/dc design is acceptable |
| TPS23754PWPR | Pin-compatible upgrade with 25.5 W Type 2 support; identical TSSOP-14 package; adds auxiliary 3.3 V LDO | Enables dual-rail outputs without external regulators; maintains same PCB layout and firmware | Choose TPS23754PWPR for drop-in migration to higher PoE power class with minimal redesign |
Compared with LT4275AIMSE#PBF and TPS23754PWPR, the TPS23753PW offers lowest system cost for 13 W applications due to integrated gate driver and VB rail, while TPS23754PWPR provides seamless upgrade path with identical pinout and enhanced feature set.
Availability
TPS23753PW is available at Aetrix Electronics and suitable for VoIP telephony, wireless access points, IP security cameras, and industrial IoT gateways requiring stable component supply across multi-year production cycles.
Supply support for TPS23753PW 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 technologies with over 50 years of power management innovation.
The TPS23753PW belongs to TI's Power over Ethernet product line, designed specifically for compact, thermally constrained powered devices requiring integrated PoE interface and isolated dc/dc control in single-package solutions.
FAQ
What is the maximum input voltage the TPS23753PW can withstand on VDD?
The TPS23753PW has an absolute maximum VDD rating of 100 V, but its recommended operating range is 0–57 V. Operation above 57 V risks exceeding thermal limits and violating IEEE 802.3at specifications. The device includes undervoltage lockout (UVLO_R = 35 V) and overvoltage protection via external Zener clamping - critical for surviving PSE transients. Always use a transient suppressor diode from VDD to VSS in final designs.
How do I configure the TPS23753PW for IEEE 802.3at Class 3 operation?
To configure the TPS23753PW for Class 3 (12.95 W), connect a 63.4 kΩ ±1% resistor from CLS pin (11) to VSS. This sets classification current to 38–42 mA per IEEE 802.3at Table 33–8. Confirm operation using a PoE tester that validates signature resistance (25 kΩ), classification current, and maintain-power-signature (MPS) timing. Do not exceed 249 kΩ on RBLNK if using programmable blanking - it affects classification accuracy.
Can the TPS23753PW be synchronized to an external clock, and what are the requirements?
Yes, the TPS23753PW supports external synchronization via the FRS pin (14). Apply short AC-coupled pulses (25–150 ns width, >2.2 V threshold) at frequency >273 kHz. Pulses must be clean, low-jitter, and referenced to RTN. Use series 100 Ω resistor and 100 pF capacitor for AC coupling. Synchronization reduces beat frequencies in multi-channel systems and eases EMI filtering - verified in TPS23753EVM-001 test reports.
What is the purpose of the APD pin on the TPS23753PW, and how should it be used?
The APD pin (12) on the TPS23753PW enables adapter ORing by disabling the internal hotswap MOSFET when an external adapter is present. Tie APD to RTN through a resistor divider (e.g., 1 MΩ/100 kΩ) to detect adapter voltage ≥12 V. When APD exceeds 1.5 V, the hotswap switch opens and power routes from VDD1–RTN instead of VDD–VSS. This provides seamless failover without external MOSFETs or controllers.
Does the TPS23753PW require an external bootstrap capacitor, and what is the minimum value for VC?
No, the TPS23753PW uses an internal bootstrap current source from VDD1 to charge VC - eliminating need for external bootstrap diode/capacitor. However, VC requires a minimum 0.22 µF ceramic capacitor (X7R, 10%) placed adjacent to the pin and connected to RTN. For reliable startup under worst-case conditions (e.g., 10.2 V VDD1), total VC capacitance should be ≥10 µF using parallel ceramic + tantalum. Insufficient VC capacitance causes startup failure or intermittent operation.
TPS23753PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Not For New Designs
- Type:
- Controller (PD), DC/DC
- Number of Channels:
- 1
- Power - Max:
- 13 W
- Internal Switch(s):
- Both
- Auxiliary Sense:
- No
- Standards:
- 802.3at (PoE+), 802.3af (PoE)
- Voltage - Supply:
- 0V ~ 57V
- Current - Supply:
- 580µA
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
TPS23753PW FAQ
1.How can I place an order for TPS23753PW through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS23753PW 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 TPS23753PW reliable?
The price and inventory of TPS23753PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS23753PW is usually 5 days.
3.What payment methods are accepted for TPS23753PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS23753PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS23753PW?
TPS23753PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS23753PW 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 TPS23753PW?
For technical support, including TPS23753PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS23753PW requirements.
6.How does Aetrix verify that TPS23753PW is sourced from the original manufacturer or authorized distributors?
All TPS23753PW 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 TPS23753PW meets industry standards.
7.What is the process for return or replacement of TPS23753PW?
All TPS23753PW units undergo pre-shipment inspection (PSI). If there is an issue with TPS23753PW, 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 TPS23753PW part is unused and in its original packaging.
Return procedure for TPS23753PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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