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Texas Instruments LM5166DRCR
- Part No.:
- LM5166DRCR
- Manufacturer:
- Texas Instruments
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
LM5166DRCR.pdf
- Description:
- IC REG BUCK ADJ 500MA 10VSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,859
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Product details
Overview
LM5166DRCR from Texas Instruments is a 3-V to 65-V input, 500-mA synchronous buck converter with ultra-low 9.7-µA no-load quiescent current, integrated 1-Ω P-channel high-side and 0.5-Ω N-channel low-side MOSFETs, and selectable COT or PFM operation - used in factory automation power rails and automotive battery-supplied subsystems.
For engineers reviewing the LM5166DRCR datasheet, LM5166DRCR pinout, LM5166DRCR application, or LM5166DRCR equivalent, this page delivers verified specifications, validated pin functions, confirmed thermal performance up to 150°C junction, and real-world efficiency curves across 0.01–500 mA loads at VIN = 8 V to 65 V.
Technical Context
The LM5166DRCR implements constant-on-time (COT) or pulse-frequency modulation (PFM) control without loop compensation, enabling fast transient response and stable operation across wide input (3–65 V) and output load (0–500 mA) ranges. Its integrated high-side P-FET supports 100% duty cycle for ultra-low dropout, while the synchronous NFET eliminates external Schottky diodes.
Key functional blocks include a 1.223-V ±1.2% internal reference, programmable peak current limit (200/300/500 mA), open-drain PGOOD with 7% hysteresis, precision enable/UVLO with 76-mV hysteresis, and thermally protected shutdown at 170°C with 10°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 65 V - supports direct connection to 24-V/48-V industrial buses and automotive batteries without pre-regulation. |
| Output Current | Up to 500 mA - sufficient for powering microcontrollers, sensors, and interface ICs in space-constrained designs. |
| No-Load IQ | 9.7 µA - enables multi-year battery life in always-on IoT and remote monitoring applications. |
| Switching Frequency | Up to 600 kHz - allows compact magnetics and reduces solution footprint vs lower-frequency converters. |
| Thermal Range | –40°C to +150°C junction - qualified for under-hood automotive and high-temperature industrial environments. |
| Package | 10-pin VSON (3 mm × 3 mm, 0.5-mm pitch) - exposes thermal pad for efficient PCB heat dissipation (RθJB = 26.6°C/W). |
| EMI Compliance | Meets EN55022/CISPR 22 Class B - reduces need for external filtering in EMC-sensitive deployments. |
Pinout & Package
LM5166DRCR uses a 10-pin VSON package (3 mm × 3 mm, 0.5-mm pitch) with exposed thermal pad connected to GND. The package supports reflow soldering and provides low thermal resistance to PCB (RθJB = 26.6°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switching node | Internal drain connection of both P-FET (high-side) and N-FET (low-side); connects directly to buck inductor. |
| 2 VIN | Input supply rail | Primary power input for high-side FET and internal LDO bias; requires short, low-inductance path to CIN. |
| 3 ILIM | Current limit programming | Resistor-to-GND sets peak current limit to 200/300/500 mA - optimizes inductor selection per load requirement. |
| 4 SS | Soft-start control | Capacitor-to-GND extends soft-start beyond 900 µs; floating enables internal 900-µs ramp; resistor disables soft-start. |
| 5 RT | Mode select & on-time programming | Resistor-to-GND sets COT frequency; shorted to GND selects PFM mode - no compensation required. |
| 6 PGOOD | Power-good indicator | Open-drain NFET output asserting low when VOUT deviates >7% from regulation - used for sequencing and fault reporting. |
| 7 EN | Enable / UVLO input | Logic-level enable with 1.22-V threshold and 76-mV hysteresis - ensures clean startup across input voltage transients. |
| 8 FB | Feedback input | Connects to external resistor divider for adjustable output; internal 1.223-V reference enables 3.3-V/5-V fixed options via internal dividers. |
| 9 HYS | UVLO hysteresis control | Drain of internal NFET; external R-divider from HYS to EN/GND programs custom UVLO thresholds and hysteresis. |
| 10 GND | Ground return | Power and signal ground; thermal pad must be soldered to PCB GND plane for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated P-FET + N-FET | 1-Ω high-side + 0.5-Ω low-side MOSFETs eliminate external diode and reduce BOM count by ≥3 components. |
| 100% Duty Cycle Operation | Enables dropout as low as VOUT − VIN ≈ 0 V - critical for high-voltage-to-low-voltage conversion (e.g., 65 V → 5 V). |
| Diode Emulation + Pulse Skipping | Delivers >90% efficiency at 100 µA load - extends battery runtime in sensor nodes and wake-on-event systems. |
| No Loop Compensation Required | Both COT and PFM modes stabilize inherently - removes 2–4 external compensation components and design iteration time. |
| Adjustable Soft Start | Configurable via capacitor (≥900 µs), resistor (disabled), or internal default (900 µs) - prevents inrush current in cascaded supplies. |
| EN/UVLO with Programmable Hysteresis | HYS pin enables custom UVLO thresholds (e.g., 24 V ±1 V) - avoids brownout resets in fluctuating industrial power rails. |
Applications
| Factory Automation Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Powers PLC I/O modules and fieldbus transceivers from unregulated 24-V DC rails subject to load dump and cold-crank conditions. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 5-V/3.3-V bias to microcontrollers and CAN transceivers. Use Value: 65-V max input withstands 40-V load dump pulses; 150°C junction rating survives engine bay ambient temperatures. |
Use Scenario: Supplies infotainment sub-systems and door module ECUs from 12-V battery with stop-start cycling. IC Role / Device Role / Timing Role: High-efficiency buck converter operating in PFM mode during vehicle sleep state. Use Value: 9.7-µA IQ enables <10 µA system standby current - meets ISO 16750-2 quiescent current requirements. |
| High-Voltage LDO Replacement | Low-Power Industrial Sensor Node |
|
Use Scenario: Replaces inefficient linear regulators in 48-V telecom or industrial equipment where heat dissipation is constrained. IC Role / Device Role / Timing Role: Efficient switching alternative to 78xx-style LDOs, reducing thermal load by >80% at 500-mA output. Use Value: 90%+ efficiency at full load cuts power loss from 2.5 W (LDO) to <0.3 W - eliminates heatsink requirement. |
Use Scenario: Powers wireless sensor transmitters (BLE/Zigbee) in battery-operated condition monitoring devices. IC Role / Device Role / Timing Role: Primary power stage enabling multi-year operation on two AA cells or coin-cell backup. Use Value: Diode emulation in light-load DCM achieves >85% efficiency at 100-µA load - doubles usable battery capacity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5165DRCR | Pin-to-pin compatible; identical 3–65 V input, but rated for 150 mA only and lacks PGOOD output. | Suitable for ultra-low-power sensor nodes where PGOOD sequencing is unnecessary and load ≤150 mA. | Select LM5165DRCR only if output current demand is ≤150 mA and power-good signaling is not required. |
| TPS54202HDDCR | 2.5–17-V input range; 2-A output; requires external compensation; no 100% duty cycle support. | Better suited for mid-range industrial supplies where input is regulated ≤17 V and higher current is needed. | Choose TPS54202HDDCR when input voltage is ≤17 V and >500 mA output is required - not a drop-in replacement. |
Compared with LM5165DRCR and TPS54202HDDCR, LM5166DRCR uniquely combines 65-V input tolerance, 500-mA output, PGOOD signaling, and 100% duty cycle in a 3-mm² package - making it the only option for high-input, medium-current, thermally demanding applications.
Availability
LM5166DRCR is available at Aetrix Electronics and suitable for factory automation power supplies, automotive body control modules, and high-voltage LDO replacements requiring stable component supply across extended temperature and input voltage ranges.
Supply support for LM5166DRCR 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 company headquartered in Dallas, Texas, designing analog and embedded processing solutions for industrial, automotive, and communications markets.
The LM5166DRCR belongs to TI's high-voltage DC/DC converter product line, engineered specifically for reliable operation in harsh environments - including automotive under-hood, industrial control cabinets, and railway infrastructure - where wide input range and thermal robustness are mandatory.
FAQ
What is the maximum input voltage rating for LM5166DRCR?
The LM5166DRCR has an absolute maximum input voltage rating of 68 V and a recommended operating maximum of 65 V. This allows direct connection to 48-V industrial buses and withstands automotive load-dump transients up to 65 V without derating. Operation above 65 V violates recommended conditions and may impact reliability.
Does LM5166DRCR support adjustable output voltage?
Yes, the LM5166DRCR supports adjustable output voltage via the FB pin using an external resistor divider. Its internal 1.223-V ±1.2% reference enables precise regulation from ~1.25 V to 65 V. Fixed 3.3-V (LM5166Y) and 5-V (LM5166X) variants exist, but LM5166DRCR itself is the adjustable version.
How does the ILIM pin configure current limiting on LM5166DRCR?
The ILIM pin on LM5166DRCR sets peak current limit by connecting a resistor to GND: 100 kΩ yields 500 mA, 150 kΩ yields 300 mA, and 220 kΩ yields 200 mA. This adjusts inductor saturation margin and overcurrent protection threshold - critical for optimizing efficiency and reliability across varying load profiles.
Can LM5166DRCR operate with 100% duty cycle, and why does that matter?
Yes, LM5166DRCR's integrated P-channel high-side switch enables true 100% duty cycle operation. This eliminates minimum dropout voltage - allowing regulation even when VIN approaches VOUT (e.g., 5.5 V → 5 V). It replaces bulky pre-regulators in high-ratio step-down applications like 65-V to 5-V conversion.
What thermal performance can be expected from LM5166DRCR in a standard 2-layer PCB layout?
In a standard 2-layer PCB with 1-in² 2-oz copper GND pour under the exposed thermal pad, LM5166DRCR achieves RθJB = 26.6°C/W. At 500-mA load and 24-V input, typical power dissipation is ~0.35 W, resulting in ~9°C rise above ambient - well within its –40°C to +150°C junction range.
LM5166DRCR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 65V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 65V
- Current - Output:
- 500mA
- Frequency - Switching:
- 50kHz ~ 600kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-VSON (3x3)
LM5166DRCR FAQ
1.How can I place an order for LM5166DRCR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5166DRCR 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 LM5166DRCR reliable?
The price and inventory of LM5166DRCR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5166DRCR is usually 5 days.
3.What payment methods are accepted for LM5166DRCR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5166DRCR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5166DRCR?
LM5166DRCR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5166DRCR 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 LM5166DRCR?
For technical support, including LM5166DRCR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5166DRCR requirements.
6.How does Aetrix verify that LM5166DRCR is sourced from the original manufacturer or authorized distributors?
All LM5166DRCR 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 LM5166DRCR meets industry standards.
7.What is the process for return or replacement of LM5166DRCR?
All LM5166DRCR units undergo pre-shipment inspection (PSI). If there is an issue with LM5166DRCR, 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 LM5166DRCR part is unused and in its original packaging.
Return procedure for LM5166DRCR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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