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Texas Instruments LM5070SDX-80/NOPB
- Part No.:
- LM5070SDX-80/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LM5070SDX-80/NOPB.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 16WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,243
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Product details
Overview
LM5070SDX-80/NOPB from Texas Instruments is an IEEE 802.3af-compliant Powered Device (PD) interface and current-mode PWM controller IC with integrated 80V/400mA MOSFET, programmable 80% max duty cycle, slope compensation, and inrush current limiting for PoE-powered equipment. It enables single-chip PD implementation in isolated or non-isolated flyback/forward converters.
For engineers reviewing the LM5070SDX-80/NOPB datasheet, LM5070SDX-80/NOPB pinout, LM5070SDX-80/NOPB application, or LM5070SDX-80/NOPB equivalent, key selection criteria include IEEE 802.3af signature/classification compliance, 80V input rating, internal MOSFET RDS(ON) ≤ 2.2Ω, programmable inrush limit (75–390 mA), and thermal shutdown at 165°C.
Technical Context
The LM5070SDX-80/NOPB integrates a full IEEE 802.3af PD interface-including detection (25kΩ signature resistor support), classification (programmable 0–4 class via RCLASS), UVLO (2.00V threshold with 10µA hysteresis current), and inrush control (RCLP-programmable)-with a current-mode PWM controller featuring slope compensation, 200 kHz typical oscillator frequency (RT-set), and 800 mA peak gate drive on OUT.
Its architecture supports automatic power sequencing: the internal high-voltage startup regulator powers VCC to 7.8V before enabling SMPS operation; RTN voltage drop below 1.5V triggers soft-start; and COMP-based error amplification (1.25V reference) supports both isolated (optocoupler-compatible) and non-isolated feedback topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IEEE Compliance | Fully compliant with IEEE 802.3af PD interface requirements including detection, classification, and inrush timing. |
| Input Voltage Range | 1.8V to 75V VIN-to-VEE - supports wide-range PoE input including legacy PSEs and transient overvoltage conditions. |
| Internal MOSFET | 80V, 400mA rated, RDS(ON) ≤ 2.2Ω - eliminates external switch for low-power PD designs up to ~13W. |
| Duty Cycle Limit | 80% maximum with slope compensation - enables stable current-mode control in >50% duty applications like flyback converters. |
| Oscillator Frequency | 175–225 kHz (RT = 30.3kΩ) - sets switching frequency for EMI optimization and transformer sizing. |
| Inrush Current Limit | Programmable 75–390 mA via RCLP pin - ensures IEEE-mandated 75ms capacitor charge time while protecting legacy PSEs. |
| Thermal Protection | 165°C shutdown with 25°C hysteresis - prevents damage during sustained overload or poor heatsinking. |
Pinout & Package
TSSOP-16 package (Package Code PW), thermally enhanced with exposed pad bonded to VEE for low θJA = 125°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | High-side input | Accepts PoE line voltage (up to 75V); diode-OR'd with other inputs; powers internal HV regulator. |
| RSIG | Signature detection node | Connects 25kΩ resistor to VIN for IEEE 802.3af detection impedance (23.75–26.25kΩ). |
| RCLASS | Classification current sink | Sinks programmable current (0–44mA) to set IEEE class; open for Class 0 default. |
| UVLO | UVLO threshold input | 2.00V reference point; external resistor divider sets turn-on/off thresholds with 10µA hysteresis current. |
| RCLP | Inrush current programming | Resistor value sets initial charging current (75–390mA); open defaults to 390mA. |
| OUT | PWM gate driver output | 800mA peak sink capability drives external MOSFET gate or internal FET; cycle-by-cycle current limited. |
| CS | Current sense comparator input | 0.5V threshold triggers immediate OUT disable; 55ns leading-edge blanking suppresses noise. |
| FB | Error amplifier inverting input | 1.25V internal reference; connects to scaled output voltage for regulation in non-isolated designs. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 80V/400mA MOSFET | Reduces BOM count and layout area; eliminates need for external high-voltage switch in sub-13W PDs. |
| Programmable inrush current limit | Enables compatibility with legacy PSEs delivering <15W by scaling initial capacitor charge current without redesign. |
| Slope compensation (–80 suffix) | Stabilizes current-mode control above 50% duty cycle-critical for flyback converters operating near 80% duty. |
| Automatic power sequencing | Eliminates external timers or supervisors: VCC enable → RTN monitoring → soft-start → SMPS operation. |
| Thermal shutdown with hysteresis | Prevents latch-up during overload; 25°C hysteresis ensures reliable recovery without oscillation. |
Applications
| VoIP Phones | Wireless Access Points |
|---|---|
Use Scenario: Powered via Category 5 Ethernet cable in enterprise office environments with IEEE 802.3af PSEs. IC Role / Device Role / Timing Role: PD interface controller managing signature, classification, inrush, and DC-DC conversion for 5V/3.3V system rails. Use Value: Single-chip integration reduces footprint and cost versus discrete PD + controller solutions; 80% duty cycle supports efficient flyback design at full load. | Use Scenario: Outdoor or high-density Wi-Fi deployments requiring PoE power with thermal resilience. IC Role / Device Role / Timing Role: Primary PD controller enabling 12V/5V isolated outputs with remote enable/disable via UVLO pin. Use Value: Programmable UVLO hysteresis allows custom brown-out recovery; thermal shutdown protects against enclosure overheating in sealed enclosures. |
| IP Cameras | Thin Clients |
Use Scenario: Day/night security cameras drawing variable load (IR LEDs on/off) over PoE infrastructure. IC Role / Device Role / Timing Role: PD interface + current-mode PWM controller regulating isolated 12V rail with fast transient response. Use Value: Cycle-by-cycle current limiting (0.5V CS threshold) prevents false trips during IR LED surge currents; soft-start avoids PSE current-limit faults. | Use Scenario: Fanless desktop thin clients deployed in education or healthcare networks using PoE switches. IC Role / Device Role / Timing Role: Integrated PD controller powering non-isolated buck-derived 3.3V/1.8V rails with minimal external components. Use Value: Internal error amplifier (1.25V ref) and COMP pull-up simplify feedback; RDS(ON) ≤ 2.2Ω minimizes conduction loss at full load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Powered Device interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5071SDX/NOPB | Supports IEEE 802.3at (PoE+) with 30W capability; no integrated MOSFET; requires external 100V switch. | Targeted at higher-power PDs (>13W); lacks internal FET but adds auxiliary bias winding control. | Select LM5071SDX/NOPB when upgrading to PoE+ or needing >13W output; LM5070SDX-80/NOPB remains optimal for cost-sensitive 802.3af-only designs. |
| LT4275IMS#TRPBF | Linear Technology (now Analog Devices) IEEE 802.3af PD interface with integrated 100V/600mA MOSFET; 650kHz max frequency; no slope compensation. | Higher switching frequency enables smaller magnetics; lacks slope compensation limits stable duty cycle to ≤50%. | Choose LT4275IMS#TRPBF for compact designs prioritizing size over duty-cycle flexibility; LM5070SDX-80/NOPB preferred where 80% duty is needed for efficiency at low input voltage. |
Compared with LM5071SDX/NOPB and LT4275IMS#TRPBF, LM5070SDX-80/NOPB uniquely combines IEEE 802.3af compliance, integrated 80V MOSFET, and slope-compensated 80% duty cycle-enabling robust, low-component-count flyback converters for 13W-class PDs without external gate drivers or compensation networks.
Availability
LM5070SDX-80/NOPB is available at Aetrix Electronics and suitable for VoIP phones, wireless access points, IP cameras, and thin clients requiring stable component supply and long-term PoE interface continuity.
Supply support for LM5070SDX-80/NOPB 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, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The LM5070 product line delivers integrated Power over Ethernet PD controllers targeting cost-effective, space-constrained powered devices requiring full IEEE 802.3af compliance and self-contained DC-DC control.
FAQ
What is the maximum input voltage rating for the LM5070SDX-80/NOPB?
The LM5070SDX-80/NOPB supports a VIN-to-VEE operating range of 1.8V to 75V, with absolute maximum rating of 80V. This accommodates standard PoE voltages (44–57V), transients, and legacy PSEs. The internal 80V MOSFET and UVLO circuitry are designed to operate reliably within this envelope without external clamping.
Does the LM5070SDX-80/NOPB require an external MOSFET for PoE interface operation?
No, the LM5070SDX-80/NOPB integrates an 80V, 400mA MOSFET with RDS(ON) ≤ 2.2Ω, eliminating the need for an external switch in most IEEE 802.3af PD applications up to ~13W. External FETs are only required for higher-power PoE+ (802.3at) or ultra-low-loss designs.
How does the LM5070SDX-80/NOPB implement IEEE 802.3af signature detection?
The LM5070SDX-80/NOPB implements signature detection by enabling a 25kΩ resistor between VIN and RSIG when VIN exceeds 1.5V. This creates the required 23.75–26.25kΩ impedance window for PSE detection, with <10µA offset current and controlled capacitance to meet specification.
What is the purpose of the RCLP pin on the LM5070SDX-80/NOPB?
The RCLP pin on the LM5070SDX-80/NOPB programs the inrush current limit during PD startup-from 75mA to 390mA-by connecting an external resistor. This ensures compliance with IEEE 802.3af's 75ms capacitor charge requirement while protecting legacy PSEs incapable of delivering full 15W during startup.
Can the LM5070SDX-80/NOPB be used in isolated DC-DC converter topologies?
Yes, the LM5070SDX-80/NOPB supports both isolated and non-isolated topologies. Its COMP pin features an internal 5kΩ pull-up for optocoupler interfacing, and FB can be disabled (tied to ARTN) to bypass the internal error amplifier-enabling secondary-side regulation in flyback or forward converters.
LM5070SDX-80/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Controller (PD), DC/DC
- Number of Channels:
- 1
- Power - Max:
- -
- Internal Switch(s):
- Both
- Auxiliary Sense:
- No
- Standards:
- 802.3af (PoE)
- Voltage - Supply:
- 1.8V ~ 75V
- Current - Supply:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-WSON (5x5)
LM5070SDX-80/NOPB FAQ
1.How can I place an order for LM5070SDX-80/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5070SDX-80/NOPB 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 LM5070SDX-80/NOPB reliable?
The price and inventory of LM5070SDX-80/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5070SDX-80/NOPB is usually 5 days.
3.What payment methods are accepted for LM5070SDX-80/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5070SDX-80/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5070SDX-80/NOPB?
LM5070SDX-80/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5070SDX-80/NOPB 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 LM5070SDX-80/NOPB?
For technical support, including LM5070SDX-80/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5070SDX-80/NOPB requirements.
6.How does Aetrix verify that LM5070SDX-80/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5070SDX-80/NOPB 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 LM5070SDX-80/NOPB meets industry standards.
7.What is the process for return or replacement of LM5070SDX-80/NOPB?
All LM5070SDX-80/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5070SDX-80/NOPB, 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 LM5070SDX-80/NOPB part is unused and in its original packaging.
Return procedure for LM5070SDX-80/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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