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Texas Instruments LM5160DNTJ
- Part No.:
- LM5160DNTJ
- Manufacturer:
- Texas Instruments
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LM5160DNTJ.pdf
- Description:
- IC REG BCK FLYBACK ADJ 2A 12WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,573
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Product details
Overview
LM5160DNTJ 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 industrial PLCs, IGBT gate drive bias, and telecom isolated bias supplies.
For engineers reviewing the LM5160DNTJ datasheet, LM5160DNTJ pinout, LM5160DNTJ application, or LM5160DNTJ equivalent, key selection criteria include input voltage range (4.5–65 V), load current capability (2 A), programmable switching frequency (up to 1 MHz), thermal shutdown with hysteresis (175°C/20°C), and Fly-Buck™-enabled FPWM logic configuration.
Technical Context
The LM5160DNTJ implements adaptive constant on-time (COT) control where switch on-time varies inversely with VIN, enabling stable regulation across wide input ranges without external loop compensation. Its internal error amplifier maintains ±1% output voltage accuracy over –40°C to 125°C, and peak/valley current limiting provides robust overload protection.
FPWM pin logic selects forced PWM (CCM) for multi-output Fly-Buck™ operation or DCM for light-load efficiency; VCC UVLO (4.1 V threshold, 185 mV hysteresis) and EN/UVLO (1.24 V threshold, 47 mV hysteresis) ensure reliable startup and fault recovery. The device supports external VCC bias only in LM5160A variants - LM5160DNTJ uses internal VCC regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 65 V - enables direct operation from 24-V industrial rails, 48-V telecom/PoE, and unregulated HV sources without pre-regulation. |
| Max Output Current | 2 A - delivers full-rated load with integrated 0.29 Ω high-side and 0.13 Ω low-side MOSFETs, eliminating external Schottky diode. |
| Feedback Reference | 2.0 V ±1% - ensures precise output regulation across temperature; sets output via resistor divider on FB pin. |
| Switching Frequency | Up to 1 MHz - adjustable via RON resistor; maintains near-constant frequency vs. VIN/load due to adaptive COT architecture. |
| Thermal Shutdown | 175°C activation with 20°C hysteresis - prevents latch-up during sustained overload and enables safe auto-recovery. |
| Soft-Start Time | Programmable via SS-to-AGND capacitor - controls output ramp rate to limit inrush current and overshoot during startup. |
| Current Limit Threshold | 2.5 A typical high-side ILIM - provides fast overcurrent protection with 100 ns response time and VIN/VFB-dependent off-timer. |
Pinout & Package
LM5160DNTJ is housed in a 12-pin WSON package (4.0 mm × 4.0 mm) with exposed thermal pad, optimized for high-voltage power conversion and thermal performance (RθJA = 33.4°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 AGND | Analog ground reference | Return path for internal control circuits; must be connected to quiet analog ground plane, separate from PGND at single point. |
| 2 PGND | Power ground return | Source connection of low-side FET; carries high di/dt switching current - requires low-inductance PCB copper pour. |
| 3 VIN | Main input supply | Accepts 4.5–65 V; connects to bulk input capacitor and RON programming resistor; powers internal bias regulator. |
| 4 EN/UVLO | Enable & input UVLO input | Logic-enable pin with precision 1.24 V threshold and adjustable hysteresis; controls startup/shutdown sequencing. |
| 5 RON | On-time programming | Resistor from VIN sets adaptive on-time; determines switching frequency - e.g., 100 kΩ yields ~428 ns at VIN = 24 V. |
| 6 SS | Soft-start control | Capacitor to AGND sets output rise time; clamps error amp during startup to prevent overshoot and inrush. |
| 7 FPWM | Forced PWM mode select | Connect to VCC for CCM (Fly-Buck™ compatible); connect to AGND for DCM (diode emulation at light load). |
| 8 FB | Output voltage feedback | High-impedance input (100 nA bias) compares output to 2.0 V reference; sets VOUT via RFB1/RFB2 divider. |
| 9 VCC | Bias regulator bypass | Internal 7.5 V regulator output; bypassed with 1-µF ceramic capacitor; not externally biased in LM5160DNTJ variant. |
| 10 BST | Bootstrap supply | Connects bootstrap capacitor between BST and SW to generate gate drive voltage for high-side N-FET. |
| 11–12 SW | Switch node | Drain of high-side FET / source of low-side FET; high dv/dt node requiring minimized loop area and guard ring. |
| EP (Exposed Pad) | Thermal & ground connection | Must be soldered to AGND plane for thermal dissipation and EMI reduction; improves RθJCbot to 1.9°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive constant on-time control | Eliminates need for external compensation network; achieves fast transient response (<10 µs) while maintaining stable regulation across 4.5–65 V input. |
| Integrated dual MOSFETs | 0.29 Ω high-side + 0.13 Ω low-side RDS(on) reduces conduction loss and board space; removes requirement for external Schottky diode in buck mode. |
| Selectably forced PWM (FPWM) | Enables CCM operation down to no-load - essential for stable multi-output Fly-Buck™ designs using coupled inductors. |
| Prebiased start-up support | Allows output capacitor to be precharged before enable; prevents reverse current flow into FB divider during hot-plug scenarios. |
| Inherent protection suite | Includes peak current limiting (2.5 A), VCC UVLO (4.1 V), EN/UVLO with hysteresis, and thermal shutdown (175°C/20°C) - no external components needed. |
Applications
| Industrial PLC Power Supply | IGBT Gate Drive Bias |
|---|---|
|
Use Scenario: Provides isolated 15-V/200-mA auxiliary rail from 24-V DC bus in programmable logic controller backplane. IC Role / Device Role / Timing Role: Primary buck controller generating gate drive bias; operates in CCM via FPWM = VCC for stable output under dynamic load steps. Use Value: Delivers 2 A peak current headroom for multiple IGBT drivers; adaptive COT ensures <5% output deviation during 1-A load transients. |
Use Scenario: Generates ±15-V isolated bias for high-side IGBT gate drivers in motor inverters using Fly-Buck™ topology with coupled inductor. IC Role / Device Role / Timing Role: Fly-Buck™ primary-side controller; FPWM pin held at VCC to enforce CCM for predictable coupling and reduced output ripple. Use Value: Enables compact, transformerless isolation with <1% cross-regulation between primary and secondary outputs at 300 kHz. |
| Telecom Primary-Side Bias | E-Meter PLC Interface Supply |
|
Use Scenario: Powers microcontroller and signal conditioning circuitry from 48-V telecom line in remote terminal units. IC Role / Device Role / Timing Role: Buck converter operating at 500 kHz (RON = 100 kΩ); uses DCM mode (FPWM = AGND) for >92% efficiency at 100-mA load. Use Value: Maintains >85% efficiency from 10 mA to 2 A; wide VIN range eliminates need for upstream pre-regulator in legacy 48-V systems. |
Use Scenario: Supplies isolated 3.3-V/150-mA rail for PLC modem IC in smart electricity meters connected to AC mains via bridge rectifier. IC Role / Device Role / Timing Role: Fly-Buck™ controller with 65-V max rating tolerating rectified 310-V DC peaks; thermal shutdown protects against sustained overloads. Use Value: Supports direct connection to unfiltered rectified line; 175°C thermal cutoff prevents failure during surge events or meter tampering. |
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 | Wider 4.5–100-V input range; identical pinout and FPWM functionality; higher RDS(on) (0.35 Ω HS / 0.18 Ω LS). | Supports 96-V battery systems and PoE++; less efficient at 24–48 V due to higher conduction loss. | Select LM5161DNTJ only when input exceeds 65 V; otherwise LM5160DNTJ offers better efficiency and thermal margin at 24–65 V. |
| LM5017MRX/NOPB | 65-V input, 600-mA output; SO-8 package; no FPWM pin; fixed-frequency current-mode control. | Limited to low-power Fly-Buck™; lacks CCM-enabling FPWM and soft-start programmability. | Choose LM5017MRX/NOPB for cost-sensitive, low-current (<600 mA) isolated bias; LM5160DNTJ required for 2-A loads or CCM-critical Fly-Buck™. |
Compared with LM5161DNTJ, LM5160DNTJ delivers lower conduction loss and better thermal performance at 24–65 V inputs; versus LM5017MRX/NOPB, it provides 3.3× higher current, FPWM-controlled CCM, and programmable soft-start - critical for robust industrial and telecom power design.
Availability
LM5160DNTJ is available at Aetrix Electronics and suitable for industrial PLCs, IGBT gate drive bias supplies, telecom primary-side bias, and smart meter PLC interface power requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM5160DNTJ 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 ICs, with decades of expertise in high-reliability power conversion solutions.
The LM5160DNTJ belongs to TI's wide-input synchronous buck/Fly-Buck™ converter family, designed specifically for industrial automation, telecom infrastructure, and energy metering applications demanding high-voltage tolerance, integrated FETs, and isolated bias generation.
FAQ
What is the maximum input voltage rating for the LM5160DNTJ?
The LM5160DNTJ has an absolute maximum input voltage rating of 70 V and a recommended operating range of 4.5 V to 65 V. It is rated for continuous operation up to 65 V, making it suitable for 24-V and 48-V industrial and telecom systems. Exceeding 65 V may trigger internal protection but is not guaranteed for sustained use.
Does the LM5160DNTJ support Fly-Buck™ topology, and how is it configured?
Yes, the LM5160DNTJ supports Fly-Buck™ isolated DC/DC conversion. Configuration requires connecting the FPWM pin to VCC to enforce continuous conduction mode (CCM), using a coupled inductor, and referencing secondary outputs to the primary-side AGND. The device's adaptive COT control and integrated FETs simplify implementation without external diodes or compensation.
What is the function of the RON pin on the LM5160DNTJ?
The RON pin on the LM5160DNTJ programs the adaptive on-time duration by setting a resistor between RON and VIN. This resistor determines the switching frequency - for example, a 100-kΩ resistor yields ~428 ns on-time at 24 V input, resulting in ~500 kHz operation. The inverse VIN dependence maintains near-constant frequency across input variations.
Can the LM5160DNTJ operate with a prebiased output during startup?
Yes, the LM5160DNTJ supports prebiased start-up. When the output is already charged before enable, the internal error amplifier and soft-start circuit prevent reverse current flow into the feedback divider. This avoids output voltage collapse or oscillation during hot-plug conditions common in modular industrial power systems.
How does thermal protection work on the LM5160DNTJ?
The LM5160DNTJ features thermal shutdown with activation at 175°C junction temperature and 20°C hysteresis. When triggered, the device halts switching and enters a safe state until junction temperature falls below 155°C, then automatically resumes operation. This protects against sustained overloads, poor heatsinking, or ambient temperature excursions without requiring external circuitry.
LM5160DNTJ 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)
LM5160DNTJ FAQ
1.How can I place an order for LM5160DNTJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5160DNTJ 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 LM5160DNTJ reliable?
The price and inventory of LM5160DNTJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5160DNTJ is usually 5 days.
3.What payment methods are accepted for LM5160DNTJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5160DNTJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5160DNTJ?
LM5160DNTJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5160DNTJ 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 LM5160DNTJ?
For technical support, including LM5160DNTJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5160DNTJ requirements.
6.How does Aetrix verify that LM5160DNTJ is sourced from the original manufacturer or authorized distributors?
All LM5160DNTJ 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 LM5160DNTJ meets industry standards.
7.What is the process for return or replacement of LM5160DNTJ?
All LM5160DNTJ units undergo pre-shipment inspection (PSI). If there is an issue with LM5160DNTJ, 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 LM5160DNTJ part is unused and in its original packaging.
Return procedure for LM5160DNTJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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