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Texas Instruments LM5160DNTT
- Part No.:
- LM5160DNTT
- Manufacturer:
- Texas Instruments
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LM5160DNTT.pdf
- Description:
- IC REG BCK FLYBACK ADJ 2A 12WSON
- Quantity:
- Payment:
- Shipping:
Inventory:760
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Product details
Overview
LM5160DNTT 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. It delivers isolated bias for IGBT gate drives and telecom secondary-side supplies in industrial PLCs and E-meter PLC systems.
For engineers reviewing the LM5160DNTT datasheet, LM5160DNTT pinout, LM5160DNTT application, or LM5160DNTT equivalent, key selection considerations include its 4.5–65 V input range, 12-pin WSON package with thermal pad, programmable soft-start, external VCC bias support (LM5160A variant), and Fly-Buck™-enabled forced PWM mode.
Technical Context
The LM5160DNTT implements adaptive constant on-time (COT) control where switch on-time inversely scales with VIN, enabling stable frequency across line/load variations without loop compensation. Its internal error amplifier maintains ±1% output regulation over –40°C to 125°C, and peak/valley current limiting provides robust overload protection.
FPWM pin logic selects between discontinuous conduction mode (DCM) at light load for efficiency or forced continuous conduction mode (CCM) for multi-output Fly-Buck™ operation. The device integrates 0.29 Ω high-side and 0.13 Ω low-side MOSFETs, eliminating need for external Schottky diodes and supporting up to 2 A load current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 65 V - supports direct connection to 24 V industrial rails, 48 V telecom/PoE, and 60 V automotive transients. |
| Max Output Current | 2 A - sufficient for IGBT gate drive bias, PLC I/O power, and dual-output Fly-Buck™ isolated supplies. |
| Feedback Reference | 2.0 V ±1% - enables precise output voltage setting via resistor divider; stable over full temperature range. |
| Switching Frequency | Up to 1 MHz - adjustable via RON resistor; maintains near-constant frequency under line/load variation. |
| High-Side RDS(on) | 0.29 Ω - reduces conduction loss at full load; enables high efficiency in buck and Fly-Buck™ topologies. |
| Low-Side RDS(on) | 0.13 Ω - minimizes synchronous rectifier loss; eliminates need for external Schottky diode. |
| Soft-Start Control | Capacitor-programmable - limits inrush current and output overshoot during startup. |
Pinout & Package
LM5160DNTT is housed in a 12-pin WSON package (4.00 mm × 4.00 mm) with exposed thermal pad for enhanced thermal performance. The package supports surface-mount assembly and requires PCB ground plane connection to the EP pad for optimal power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 AGND | Analog Ground | Reference node for internal control circuits; must be separated from PGND and connected to quiet analog ground plane. |
| 2 PGND | Power Ground | Return path for high-current synchronous rectifier FET; connects to power ground plane with low-inductance routing. |
| 3 VIN | Main Input Supply | Accepts 4.5–65 V; requires local ceramic input capacitor; feeds internal bias regulator and high-voltage switches. |
| 4 EN/UVLO | Enable / UVLO Input | Programmable threshold (1.24 V typ); enables device above UVLO and disables below shutdown threshold (0.35 V typ). |
| 5 RON | On-Time Programming | Resistor from VIN sets adaptive on-time; determines switching frequency and transient response characteristics. |
| 6 SS | Soft-Start | Capacitor to AGND controls ramp rate of FB voltage; prevents output overshoot and limits inrush current. |
| 7 FPWM | Forced PWM Mode Select | Logic-high (VCC) enables CCM for Fly-Buck™; logic-low (AGND) enables DCM for light-load efficiency. |
| 8 FB | Feedback Input | Compares output voltage (via resistor divider) to 2.0 V reference; regulates output with ±1% accuracy. |
| 9 VCC | Bias Regulator Bypass | Bypass capacitor stabilizes internal 7.5 V bias rail; LM5160A allows external 9–13 V supply to reduce IC dissipation. |
| 10 BST | Bootstrap Capacitor | Connects to SW via 0.1 µF ceramic; provides gate drive voltage for high-side N-channel MOSFET. |
| 11–12 SW | Switch Node | Drain of high-side FET and source of low-side FET; high dv/dt node requiring tight layout and minimal trace area. |
| EP | Exposed Thermal Pad | Must be soldered to AGND plane; primary thermal path for junction-to-board heat transfer (RθJB = 11.1 °C/W). |
Key Features
| Feature | Design Value |
|---|---|
| No external loop compensation required | Adaptive constant on-time control eliminates need for compensation network, reducing BOM count and design iteration time. |
| Integrated high- and low-side MOSFETs | 0.29 Ω HS + 0.13 Ω LS FETs enable compact, efficient buck/Fly-Buck™ designs without external diodes or drivers. |
| Prebiased start-up capability | Allows reliable startup into precharged output capacitors-critical for hot-swap and redundant power systems. |
| Selectably forced PWM operation | FPWM pin enables CCM across full load range, supporting coupled-inductor isolation and multi-rail synchronization. |
| Inherent protection suite | Includes peak current limiting, input UVLO with hysteresis, VCC/BST UVLO, and thermal shutdown with 20°C hysteresis. |
Applications
| Industrial PLC Power Supply | IGBT Gate Drive Bias |
|---|---|
|
Use Scenario: Provides isolated 15-V/200-mA auxiliary supply for digital I/O modules and CPU backplane in programmable logic controllers operating from 24-V DC bus. IC Role / Device Role / Timing Role: Primary buck controller in Fly-Buck™ topology using coupled inductor; regulates main 5-V rail while generating isolated 15-V output. Use Value: Eliminates need for separate isolated DC/DC module; achieves >85% efficiency at full load with single IC and one transformer. |
Use Scenario: Generates tightly regulated ±15-V gate drive bias for 600-V IGBTs in motor drives and inverters powered from 48-V intermediate bus. IC Role / Device Role / Timing Role: Synchronous buck controller operating in forced CCM (FPWM = VCC) to maintain stable frequency and minimize coupling noise into gate signals. Use Value: Delivers low-noise, fast-transient gate bias with <1% output drift over temperature-enabling reliable IGBT switching up to 20 kHz. |
| Telecom Secondary-Side Bias | E-Meter PLC Interface Supply |
|
Use Scenario: Supplies isolated 3.3-V/500-mA bias for Ethernet PHY and microcontroller on secondary side of telecom power system using 48-V primary input. IC Role / Device Role / Timing Role: Fly-Buck™ converter with primary-side regulation; uses FPWM to enforce CCM and suppress common-mode noise coupling into data lines. Use Value: Meets EN55022 Class B conducted emissions without additional filtering; supports IEEE 802.3af PoE compatibility. |
Use Scenario: Powers narrowband PLC modem and isolation barrier in smart electricity meters connected to AC mains via bridge rectifier and bulk capacitor (60–70 V DC). IC Role / Device Role / Timing Role: High-input-voltage buck regulator operating from unregulated rectified line; withstands 65-V transients and sustains 2-A peak loads during burst transmission. Use Value: Enables direct connection to rectified AC without pre-regulator; maintains regulation during brownouts down to 4.5 V input. |
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 |
|---|---|---|---|
| LM5161DNTT | Wider 4.5–100 V input range; same 2-A rating and pinout; higher VIN max enables direct 96-V battery or 3-phase rectified input use. | Supports higher-voltage industrial and solar MPPT inputs where LM5160DNTT's 65-V limit is insufficient. | Choose LM5161DNTT when input may exceed 65 V; otherwise LM5160DNTT offers identical functionality at lower cost. |
| LM5017MRX/NOPB | 65-V input, 600-mA output; SO-8 package; no integrated low-side FET (requires external diode); lacks FPWM and Fly-Buck™ optimization. | Suitable only for low-power non-isolated buck; cannot replace LM5160DNTT in Fly-Buck™ or >1-A applications. | Select LM5017MRX/NOPB only for cost-sensitive, low-current, non-isolated designs where size and isolation are not required. |
Compared with LM5161DNTT, LM5160DNTT trades 35-V input headroom for tighter thermal performance and lower system cost in 65-V-limited applications; compared with LM5017MRX/NOPB, it delivers 3.3× higher current, integrated synchronous rectification, and true Fly-Buck™ capability-making it the only viable option for isolated 2-A bias generation.
Availability
LM5160DNTT is available at Aetrix Electronics and suitable for industrial PLC power supplies, IGBT gate drive bias systems, and telecom secondary-side bias applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM5160DNTT 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 with over 90 years of engineering excellence.
The LM5160DNTT belongs to TI's wide-input-voltage DC/DC converter product line, designed specifically for robust, high-efficiency power conversion in harsh environments-targeting industrial automation, energy infrastructure, and isolated bias generation.
FAQ
What is the maximum input voltage rating for the LM5160DNTT?
The LM5160DNTT has an absolute maximum input voltage rating of 70 V and a recommended operating maximum of 65 V. Operation beyond 65 V risks exceeding safe junction temperature and violating recommended conditions-even if within absolute maximum ratings. For designs requiring >65 V input, consider the LM5161DNTT, which supports up to 100 V.
Does the LM5160DNTT support Fly-Buck™ topology out of the box?
Yes, the LM5160DNTT natively supports Fly-Buck™ operation through its FPWM pin and adaptive constant on-time control. When FPWM is tied to VCC, the device operates in forced CCM-essential for stable coupled-inductor behavior and predictable cross-regulation. The LM5160DNTT datasheet includes verified Fly-Buck™ reference designs with efficiency and noise performance data.
Can the LM5160DNTT be used with an external VCC bias supply?
No-the LM5160DNTT does not support external VCC bias. Only the LM5160A variant (e.g., LM5160ADNTT) allows connection of a 9–13 V external supply to the VCC pin to reduce internal power dissipation at high input voltages. The LM5160DNTT relies solely on its internal bias regulator; using external VCC on this part may damage the IC.
What is the purpose of the RON pin on the LM5160DNTT?
The RON pin on the LM5160DNTT programs the adaptive on-time duration by connecting a resistor between RON and VIN. This resistor sets the switching frequency (up to 1 MHz) and directly influences transient response speed and minimum off-time behavior. Typical values range from 100 kΩ to 200 kΩ depending on desired frequency and input voltage range.
How does thermal management work on the LM5160DNTT?
The LM5160DNTT uses its exposed thermal pad (EP) as the primary heat path, with a junction-to-board thermal resistance (RθJB) of 11.1 °C/W. To maintain safe operation at 2 A, the EP must be soldered to a solid AGND copper plane covering ≥120 mm². The device includes thermal shutdown at 175°C with 20°C hysteresis, and derating begins above 125°C junction temperature.
LM5160DNTT 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)
LM5160DNTT FAQ
1.How can I place an order for LM5160DNTT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5160DNTT 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 LM5160DNTT reliable?
The price and inventory of LM5160DNTT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5160DNTT is usually 5 days.
3.What payment methods are accepted for LM5160DNTT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5160DNTT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5160DNTT?
LM5160DNTT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5160DNTT 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 LM5160DNTT?
For technical support, including LM5160DNTT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5160DNTT requirements.
6.How does Aetrix verify that LM5160DNTT is sourced from the original manufacturer or authorized distributors?
All LM5160DNTT 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 LM5160DNTT meets industry standards.
7.What is the process for return or replacement of LM5160DNTT?
All LM5160DNTT units undergo pre-shipment inspection (PSI). If there is an issue with LM5160DNTT, 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 LM5160DNTT part is unused and in its original packaging.
Return procedure for LM5160DNTT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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