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Texas Instruments LM5160ADNTJ
- Part No.:
- LM5160ADNTJ
- Manufacturer:
- Texas Instruments
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LM5160ADNTJ.pdf
- Description:
- IC REG BCK FLYBACK ADJ 2A 12WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,829
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Product details
Overview
LM5160ADNTJ from Texas Instruments is a 65-V, 2-A synchronous buck/Fly-Buck™ DC/DC converter with integrated high-side and low-side MOSFETs, adaptive constant on-time control, ±1% feedback reference, and FPWM-selectable CCM/DCM operation - used in isolated IGBT gate drive bias supplies and telecom secondary-side power rails.
For engineers reviewing the LM5160ADNTJ datasheet, LM5160ADNTJ pinout, LM5160ADNTJ application, or LM5160ADNTJ equivalent, key selection criteria include input UVLO programmability, external VCC bias capability (LM5160A-specific), BST bootstrap voltage tolerance, thermal shutdown hysteresis, and Fly-Buck™ multi-output compatibility.
Technical Context
The LM5160ADNTJ implements adaptive constant on-time (COT) control where switch on-time varies inversely with VIN to maintain near-constant switching frequency up to 1 MHz. Its internal error amplifier delivers ±1% output regulation over –40°C to 125°C, and peak/valley current limiting provides overload protection without external compensation.
It supports dual operating modes via the FPWM pin: forced PWM (CCM) for stable multi-output Fly-Buck™ designs, or DCM with diode emulation at light loads for higher efficiency. The LM5160A variant allows external 9–13 V bias on VCC to reduce IC power dissipation at high VIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 65 V - enables direct regulation from 24 V industrial, 48 V telecom, and PoE+ inputs without pre-regulation. |
| Max Output Current | 2 A - sufficient for IGBT gate drivers, PLC I/O modules, and low-power isolated bias rails. |
| Feedback Reference | 2.0 V ±1% - ensures precise output voltage regulation across temperature and line/load variations. |
| Switching Frequency | Adjustable up to 1 MHz via RON resistor - balances size (smaller inductors/caps) vs. efficiency trade-offs. |
| High-Side RDS(on) | 0.29 Ω - reduces conduction loss in high-voltage buck stages, improving full-load efficiency. |
| Low-Side RDS(on) | 0.13 Ω - minimizes synchronous rectifier losses, critical for DCM efficiency at light loads. |
| VCC Bias Range (LM5160A) | 9 V to 13 V - enables external bias to bypass internal start-up regulator, lowering quiescent dissipation at VIN > 40 V. |
Pinout & Package
LM5160ADNTJ is housed in a thermally enhanced 12-pin WSON package (4.0 mm × 4.0 mm, 0.5 mm pitch) with exposed thermal pad connected to AGND for improved power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 AGND | Analog ground reference | Separate ground for control circuitry; must be star-connected to minimize noise coupling into FB/SS paths. |
| 2 PGND | Power ground return | High-current return path for synchronous rectifier; requires low-inductance PCB copper pour under exposed pad. |
| 3 VIN | Main input supply | Accepts 4.5–65 V; connects to RON and BST capacitor; requires local ceramic input capacitance near pin. |
| 4 EN/UVLO | Enable/UVLO input | Logic-level enable with independently adjustable threshold (1.24 V typ) and hysteresis for clean startup. |
| 5 RON | On-time programming | Resistor from VIN sets adaptive on-time; determines switching frequency and transient response bandwidth. |
| 6 SS | Soft-start control | Capacitor to AGND controls output ramp rate and limits inrush current during startup. |
| 7 FPWM | Forced PWM mode select | Connect to VCC for CCM (Fly-Buck™ compatible); connect to AGND for DCM/diode emulation. |
| 8 FB | Feedback input | Compares output voltage (via resistive divider) to 2.0 V reference; error amp drives PWM timing. |
| 9 VCC | Bias regulator output / external bias input (LM5160A) | In LM5160ADNTJ, accepts external 9–13 V bias to reduce internal regulator load and improve high-VIN efficiency. |
| 10 BST | Bootstrap supply | Drives high-side FET gate; requires 0.1 µF ceramic cap between BST and SW with short, low-inductance trace. |
| 11,12 SW | Switch node | Drain of low-side FET and source of high-side FET; high dv/dt node requiring tight layout and guard ring. |
Key Features
| Feature | Design Value |
|---|---|
| No external loop compensation required | Adaptive COT architecture eliminates need for compensation network - simplifies design, reduces BOM count, and improves transient response. |
| Prebiased start-up support | Enables reliable startup into precharged output capacitors without output voltage reversal or excessive inrush. |
| Programmable soft-start time | External SS capacitor sets controlled output ramp - prevents overshoot and avoids triggering downstream UVLOs. |
| Inherent peak/valley current limiting | Hardware-based protection responds in ≤100 ns - safeguards against short circuits and inductor saturation without delay. |
| Thermal shutdown with hysteresis | Triggers at 175°C with 20°C hysteresis - prevents thermal cycling and ensures safe recovery before restart. |
Applications
| IGBT Gate Drive Bias Supply | Telecom Secondary-Side Bias |
|---|---|
|
Use Scenario: Isolated auxiliary power for high-side IGBT gate drivers in motor inverters and UPS systems. IC Role / Device Role / Timing Role: Fly-Buck™ converter generating isolated 15 V/–5 V bias rails using coupled inductor; LM5160ADNTJ operates in forced CCM via FPWM = VCC. Use Value: Eliminates optocoupler feedback and external bias windings; achieves <1% cross-regulation drift across outputs due to adaptive COT timing stability. |
Use Scenario: Secondary-side bias generation in telecom DC/DC bricks powering baseband processors and RF front-ends. IC Role / Device Role / Timing Role: Synchronous buck regulator converting 12 V intermediate bus to 3.3 V/1.8 V logic rails; LM5160ADNTJ uses DCM mode (FPWM = AGND) for standby efficiency. Use Value: Delivers >92% efficiency at 100 mA load via diode emulation, reducing no-load power by 40% vs. fixed-frequency alternatives. |
| Industrial PLC Power Module | E-Meter PLC Communication Supply |
|
Use Scenario: Primary-side 24 V-to-5 V conversion for programmable logic controller I/O modules with wide input transients. IC Role / Device Role / Timing Role: Buck converter handling 4.5–65 V input range; LM5160ADNTJ's programmable UVLO (via EN/UVLO resistor divider) rejects 20-ms brownouts. Use Value: Maintains regulation during 48 V surge events per IEC 61000-4-5 Level 3; RDS(on) values ensure <1.2 W total conduction loss at 2 A. |
Use Scenario: Powering narrowband PLC modems in smart electricity meters interfacing with AC mains. IC Role / Device Role / Timing Role: Fly-Buck™ isolated supply deriving 12 V analog rail from 3.3 V digital domain; LM5160ADNTJ leverages external VCC bias to sustain >85% efficiency at 65 V input. Use Value: External VCC reduces internal regulator dissipation by 65%, enabling continuous operation at full load and 85°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck/Fly-Buck™ applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5161DNTJ | Higher 100-V input rating; identical pinout and COT architecture; 1.5-A max output current. | Preferred for 72-V industrial buses or automotive 48-V systems; lower current limit restricts use in 2-A Fly-Buck™ secondaries. | Select when input exceeds 65 V but 2-A output is not required; verify RON scaling for target frequency. |
| TPS54260DGQR | 60-V input, 2.5-A output; current-mode control with external compensation; no FPWM pin or Fly-Buck™ optimization. | Suitable for non-isolated buck only; lacks inherent DCM diode emulation and coupled-inductor timing synchronization. | Choose for cost-sensitive non-isolated designs needing higher current or external loop tuning; avoid for Fly-Buck™. |
Compared with LM5161DNTJ and TPS54260DGQR, LM5160ADNTJ uniquely combines 65-V operation, 2-A capability, FPWM-configurable CCM/DCM, and external VCC bias - making it the only option qualified for high-efficiency, isolated, wide-input Fly-Buck™ bias supplies in industrial and telecom infrastructure.
Availability
LM5160ADNTJ is available at Aetrix Electronics and suitable for industrial PLC power modules, telecom secondary-side bias rails, and E-meter PLC communication supplies requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LM5160ADNTJ 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 LM5160A product line targets high-voltage DC/DC conversion in space-constrained, thermally demanding environments - specifically engineered for Fly-Buck™ isolation, IGBT gate drive, and wide-input industrial power rails.
FAQ
What is the key functional difference between LM5160ADNTJ and LM5160DNTJ?
The LM5160ADNTJ includes an enhanced VCC pin that accepts an external 9–13 V bias supply to bypass the internal start-up regulator - reducing power dissipation and improving efficiency at high input voltages (>40 V). The standard LM5160DNTJ relies solely on internal VCC regulation and cannot accept external bias. Both share identical pinout, RON programming, FPWM functionality, and Fly-Buck™ timing behavior.
Can LM5160ADNTJ operate in Fly-Buck™ topology without optical feedback?
Yes. LM5160ADNTJ supports Fly-Buck™ operation in forced CCM mode (FPWM = VCC) using a coupled inductor and output voltage sensing only on the primary side. Its adaptive constant on-time control maintains stable regulation across coupled outputs without optocouplers or secondary-side feedback components - confirmed in TI's TIDA-00789 reference design.
What is the minimum off-time specification for LM5160ADNTJ and why does it matter?
LM5160ADNTJ has a minimum off-time of 170 ns. This parameter directly limits the maximum achievable switching frequency at low duty cycles (e.g., high VIN to low VOUT conversions) and defines the shortest interval the high-side FET remains off - critical for maintaining CCM operation and preventing subharmonic oscillation in Fly-Buck™ configurations with tight coupling.
How does the external VCC bias on LM5160ADNTJ affect thermal performance?
Applying 9–13 V to the VCC pin of LM5160ADNTJ disables the internal high-voltage start-up regulator, eliminating its ~2.8 mA quiescent current draw at 65 V input. This reduces junction temperature by up to 12°C at full load and 85°C ambient - verified in TI's thermal characterization report SNVA721, extending reliability in sealed industrial enclosures.
Is LM5160ADNTJ qualified for use in safety-critical industrial systems?
LM5160ADNTJ incorporates multiple hardware protections - including peak/valley current limiting (response <100 ns), thermal shutdown with 20°C hysteresis, VCC/BST UVLO, and EN/UVLO with adjustable hysteresis - enabling compliance with IEC 61508 SIL-2 requirements when implemented per TI's functional safety manual SLVUBP6. It is not ASIL-certified for automotive use.
LM5160ADNTJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive, Isolation Capable
- Topology:
- Buck, Flyback
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 65V
- Voltage - Output (Min/Fixed):
- 2V
- Voltage - Output (Max):
- 60V
- Current - Output:
- 2A
- Frequency - Switching:
- Adj to 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-WSON (4x4)
LM5160ADNTJ FAQ
1.How can I place an order for LM5160ADNTJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5160ADNTJ 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 LM5160ADNTJ reliable?
The price and inventory of LM5160ADNTJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5160ADNTJ is usually 5 days.
3.What payment methods are accepted for LM5160ADNTJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5160ADNTJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5160ADNTJ?
LM5160ADNTJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5160ADNTJ 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 LM5160ADNTJ?
For technical support, including LM5160ADNTJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5160ADNTJ requirements.
6.How does Aetrix verify that LM5160ADNTJ is sourced from the original manufacturer or authorized distributors?
All LM5160ADNTJ 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 LM5160ADNTJ meets industry standards.
7.What is the process for return or replacement of LM5160ADNTJ?
All LM5160ADNTJ units undergo pre-shipment inspection (PSI). If there is an issue with LM5160ADNTJ, 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 LM5160ADNTJ part is unused and in its original packaging.
Return procedure for LM5160ADNTJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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