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Texas Instruments LM5160ADNTT
- Part No.:
- LM5160ADNTT
- Manufacturer:
- Texas Instruments
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LM5160ADNTT.pdf
- Description:
- IC REG BCK FLYBACK ADJ 2A 12WSON
- Quantity:
- Payment:
- Shipping:
Inventory:493
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Product details
Overview
LM5160ADNTT 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 or non-isolated bias power in industrial PLCs, IGBT gate drives, and telecom secondary-side supplies.
For engineers reviewing the LM5160ADNTT datasheet, LM5160ADNTT pinout, LM5160ADNTT application, or LM5160ADNTT equivalent, key selection criteria include input voltage range (4.5–65 V), programmable switching frequency up to 1 MHz, external VCC bias capability (LM5160A variant), thermal shutdown with hysteresis, and Fly-Buck™-enabled multi-output isolation support.
Technical Context
The LM5160ADNTT implements adaptive constant on-time (COT) control where on-time varies inversely with VIN to maintain near-constant switching frequency across line and load. Its internal error amplifier regulates output via a ±1% precision 2-V reference at FB, with no external compensation required.
Peak current limiting uses VIN- and VFB-dependent forced off-time for short-circuit protection without foldback. The FPWM pin selects forced PWM (CCM) for Fly-Buck™ or DCM for light-load efficiency, while EN/UVLO provides independently adjustable input undervoltage threshold (1.24 V typ.) and hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 65 V - supports direct connection to 24-V industrial, 48-V telecom, and PoE+ rails without pre-regulation. |
| Max Output Current | 2 A - sustains full-load operation with integrated 0.29 Ω high-side and 0.13 Ω low-side MOSFETs. |
| Feedback Reference | 2.0 V ±1% - enables accurate output regulation over –40°C to +125°C junction temperature range. |
| Switching Frequency | Up to 1 MHz - resistor-programmable via RON pin; maintains stability across input and load variations. |
| VCC Bias Capability | External 9–13 V bias supported - reduces IC power dissipation and improves efficiency at high VIN (LM5160A only). |
| Thermal Shutdown | 175°C with 20°C hysteresis - ensures robust operation under sustained overload or poor PCB thermal design. |
| Soft-Start Control | Capacitor-programmable via SS pin - limits inrush current and output overshoot during startup. |
Pinout & Package
LM5160ADNTT is housed in a thermally enhanced 12-pin WSON package (4.0 mm × 4.0 mm) with exposed thermal pad connected to AGND for improved power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND | Analog Ground | Reference node for internal control circuits; must be low-impedance connection to system ground plane. |
| PGND | Power Ground | Return path for synchronous rectifier FET; separate from AGND to minimize noise coupling into control loop. |
| VIN | Main Input Supply | Primary power input (4.5–65 V); supplies internal bias regulator and high-voltage switch drivers. |
| EN/UVLO | Enable / UVLO Input | Logic-enable pin with precision 1.24 V threshold; enables independent adjustment of input undervoltage lockout and hysteresis. |
| RON | On-Time Programming | Resistor-to-VIN sets adaptive on-time; determines switching frequency and transient response characteristics. |
| SS | Soft-Start | Capacitor-to-AGND controls output ramp rate and limits startup inrush; clamps VSS–VFB to 135 mV. |
| FPWM | Forced PWM Mode Select | Connect to VCC for CCM (Fly-Buck™, multi-output); connect to AGND for DCM (light-load efficiency). |
| FB | Feedback Input | Monitors output voltage via resistive divider; compares to 2.0 V reference for regulation. |
| VCC | Bias Regulator Bypass | Bypass capacitor node for internal 7.5 V LDO; accepts external 9–13 V bias in LM5160A to reduce losses at high VIN. |
| BST | Bootstrap Capacitor | Connects BST–SW capacitor to drive high-side FET gate above VIN; requires low-ESR ceramic capacitor. |
| SW | Switch Node | Drain of high-side FET and source of low-side FET; connects to coupled inductor in Fly-Buck™ topology. |
| EP | Exposed Thermal Pad | Internally connected to AGND; must be soldered to PCB ground plane for thermal performance and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Constant On-Time Control | Eliminates need for external loop compensation while delivering fast transient response and stable operation across wide VIN and load ranges. |
| Integrated High- and Low-Side MOSFETs | Reduces BOM count and layout complexity; eliminates requirement for external Schottky diode in buck configuration. |
| FPWM-Selectable Conduction Mode | Enables CCM for isolated Fly-Buck™ outputs or DCM for >90% efficiency at light loads without audible noise. |
| Prebiased Start-Up | Allows reliable startup into precharged output capacitors without output voltage reversal or latch-up. |
| Inherent Protection Suite | Includes peak current limiting, input UVLO with hysteresis, VCC/BST UVLO, and thermal shutdown with 20°C hysteresis for field reliability. |
Applications
| Industrial PLC Power Supply | IGBT Gate Drive Bias |
|---|---|
Use Scenario: Provides isolated 15-V and –5-V bias rails for half-bridge IGBT drivers in motor control inverters operating from 48-V DC bus. IC Role / Device Role / Timing Role: Fly-Buck™ controller generating dual-polarity, galvanically isolated outputs using single coupled inductor and minimal external components. Use Value: Eliminates need for separate isolated DC/DC modules; achieves <1% cross-regulation error between outputs at full load. | Use Scenario: Powers digital I/O and analog sensor interfaces in programmable logic controllers with 24-V field supply input. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 5-V or 3.3-V rail with high PSRR and low output ripple for noise-sensitive logic and ADC references. Use Value: Sustains 2-A continuous output with <50 mVpp ripple at 500 kHz; meets IEC 61000-4-5 surge immunity when combined with proper input filtering. |
| Telecom Secondary-Side Bias | E-Meter PLC Interface Supply |
Use Scenario: Generates isolated 3.3-V and 12-V auxiliary rails on secondary side of telecom offline flyback converters for management MCU and interface ICs. IC Role / Device Role / Timing Role: Secondary-side synchronous buck controller accepting rectified flyback output as VIN; operates down to 4.5 V input after bulk capacitor discharge. Use Value: Maintains regulation during brownout events; achieves >85% efficiency at 100 mA load with DCM mode enabled. | Use Scenario: Supplies isolated 5-V rail for PLC modem ICs in electricity meters connected to AC mains via transformer-coupled interface. IC Role / Device Role / Timing Role: Fly-Buck™ converter referenced to primary-side ground, delivering isolated 5-V output with <2 kV RMS reinforced insulation per IEC 61000-4-5. Use Value: Meets EN 50470-3 metering standard for creepage/clearance; supports 10-year lifetime at 85°C ambient with derated thermal design. |
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 | Higher 100-V input rating; identical pinout and Fly-Buck™ capability; 1.5-A max output current. | Preferred for 72-V industrial or 96-V battery systems; not suitable for 2-A continuous loads. | Select LM5161DNTT only when input exceeds 65 V; verify thermal margin at full load due to lower current rating. |
| LM5017MMX/NOPB | 75-V input, 600-mA output; SOIC-8 package; no FPWM pin; fixed 1-MHz frequency; no external VCC bias. | Targeted at low-power isolated bias; lacks CCM/DCM selectability and Fly-Buck™ optimization features. | Choose LM5017MMX/NOPB for cost-sensitive, space-constrained designs requiring <600 mA; avoid for multi-output or high-current Fly-Buck™. |
Compared with LM5160ADNTT, LM5161DNTT extends input voltage range but sacrifices output current headroom, while LM5017MMX/NOPB trades integration and flexibility for smaller footprint and lower cost in sub-600-mA applications.
Availability
LM5160ADNTT is available at Aetrix Electronics and suitable for industrial programmable logic controllers, IGBT gate drive bias supplies, and telecom secondary-side bias applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM5160ADNTT 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 power management technologies, with decades of expertise in high-reliability power conversion ICs.
The LM5160A product line delivers wide-input, synchronous buck/Fly-Buck™ controllers optimized for industrial automation, telecom infrastructure, and smart metering-where high-voltage resilience, isolation capability, and thermal robustness are critical.
FAQ
What is the maximum input voltage rating for the LM5160ADNTT?
The LM5160ADNTT supports an absolute maximum input voltage of 70 V, with recommended continuous operation from 4.5 V to 65 V. This allows direct connection to 48-V telecom, 60-V battery, and 24-V industrial rails without pre-regulation. Operation beyond 65 V requires verification of thermal derating and transient margin per TI's SNVSA03E datasheet Section 6.1.
Does the LM5160ADNTT support isolated Fly-Buck™ topology?
Yes, the LM5160ADNTT explicitly supports Fly-Buck™ operation via its FPWM pin and adaptive COT architecture. When FPWM is tied to VCC, it forces continuous conduction mode (CCM), enabling stable multi-output isolation using a coupled inductor. The device's integrated high- and low-side switches, precise 2-V reference, and VIN-compensated on-time ensure tight cross-regulation in isolated configurations.
How does the external VCC bias capability differ between LM5160 and LM5160A?
The LM5160ADNTT (LM5160A variant) allows an external 9–13 V supply to be connected directly to the VCC pin, bypassing the internal start-up regulator. This reduces power dissipation and improves efficiency at high input voltages (e.g., >40 V). The base LM5160 lacks this feature and relies solely on internal VCC generation from VIN, resulting in higher quiescent loss under the same conditions.
What is the purpose of the RON pin on the LM5160ADNTT?
The RON pin on the LM5160ADNTT programs the adaptive on-time by connecting a resistor between RON and VIN. This resistor sets the switching frequency (up to 1 MHz) and influences transient response-lower resistance yields shorter on-times and higher frequency. The relationship is defined in TI's SNVSA03E datasheet Equation 1 and is critical for optimizing efficiency and stability across input voltage range.
Can the LM5160ADNTT operate with prebiased outputs during startup?
Yes, the LM5160ADNTT supports prebiased start-up, allowing safe turn-on into an already charged output capacitor without causing reverse current flow or output voltage overshoot. This behavior is enabled by internal circuitry that disables the low-side FET during initial soft-start ramp, preventing energy backfeed. It is confirmed in Section 7.3.1 of the SNVSA03E datasheet and validated in typical application circuits.
LM5160ADNTT 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)
LM5160ADNTT FAQ
1.How can I place an order for LM5160ADNTT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5160ADNTT 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 LM5160ADNTT reliable?
The price and inventory of LM5160ADNTT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5160ADNTT is usually 5 days.
3.What payment methods are accepted for LM5160ADNTT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5160ADNTT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5160ADNTT?
LM5160ADNTT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5160ADNTT 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 LM5160ADNTT?
For technical support, including LM5160ADNTT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5160ADNTT requirements.
6.How does Aetrix verify that LM5160ADNTT is sourced from the original manufacturer or authorized distributors?
All LM5160ADNTT 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 LM5160ADNTT meets industry standards.
7.What is the process for return or replacement of LM5160ADNTT?
All LM5160ADNTT units undergo pre-shipment inspection (PSI). If there is an issue with LM5160ADNTT, 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 LM5160ADNTT part is unused and in its original packaging.
Return procedure for LM5160ADNTT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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