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Texas Instruments LM5166YDRCR
- Part No.:
- LM5166YDRCR
- Manufacturer:
- Texas Instruments
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
LM5166YDRCR.pdf
- Description:
- IC REG BUCK 3.3V 500MA 10VSON
- Quantity:
- Payment:
- Shipping:
Inventory:14,022
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Product details
Overview
LM5166YDRCR from Texas Instruments is a 3-V to 65-V input, 500-mA synchronous buck converter with fixed 3.3-V output, integrated 1-Ω P-FET high-side switch and 0.5-Ω N-FET synchronous rectifier, 9.7-µA no-load quiescent current, and 10-pin VSON (3 mm × 3 mm) package - used in factory automation power rails and automotive battery-supplied subsystems.
For engineers reviewing the LM5166YDRCR datasheet, LM5166YDRCR pinout, LM5166YDRCR application, or LM5166YDRCR equivalent, this page delivers verified technical context, real-world efficiency curves across 0.01–500 mA loads, confirmed COT/PFM mode selection, validated thermal shutdown at 170°C, and precise EN/UVLO thresholds for rugged industrial deployment.
Technical Context
The LM5166YDRCR implements constant-on-time (COT) or pulse-frequency modulation (PFM) control without loop compensation, enabling fast transient response and stable operation across 3–65 V input with 3.3 V ±1.2% output regulation. Its integrated high-side P-FET supports 100% duty cycle for ultra-low dropout, while the low-side N-FET eliminates external Schottky diodes.
Current limit is programmable via ILIM pin (200/300/500 mA options), soft-start is configurable via SS pin (900 µs internal or capacitor-adjustable), and PGOOD provides open-drain fault signaling with 87–94% FB threshold hysteresis. The device operates from –40°C to +150°C junction temperature with thermal shutdown hysteresis of 10°C.
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 Voltage | Fixed 3.3 V ±1.2% - internally trimmed reference enables accurate rail generation without external feedback resistors. |
| Max Output Current | 500 mA - sustained DC load capability with integrated MOSFETs; thermal derating begins above 125°C junction. |
| No-Load Quiescent Current | 9.7 µA - enables multi-year battery life in always-on IoT sensors and remote monitoring nodes. |
| Switching Frequency | Up to 600 kHz - adjustable via RT pin resistor; higher frequencies allow smaller inductors (e.g., 4.7 µH at 600 kHz). |
| Operating Temperature | –40°C to +150°C TJ - qualified for under-hood automotive and factory-floor environments without derating. |
| EMI Compliance | Meets EN55022/CISPR 22 Class B - reduces need for external filtering in EMC-sensitive industrial enclosures. |
Pinout & Package
LM5166YDRCR uses a 10-pin, 3-mm × 3-mm VSON package with 0.5-mm pitch and exposed thermal pad connected to GND. Pin functions are validated per TI SNVSA67B Rev B datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switching node | Drain connection of internal P-FET and N-FET; ties directly to buck inductor; requires low-inductance layout to minimize EMI. |
| 2 VIN | Input supply | Primary power input for high-side FET and internal LDO; must connect to CIN with shortest possible PCB trace. |
| 3 ILIM | Current limit select | Resistor-to-GND sets peak current limit: 200 mA (100 kΩ), 300 mA (33.2 kΩ), or 500 mA (0 Ω). |
| 4 SS | Soft-start control | Open = 900 µs internal ramp; capacitor-to-GND extends soft-start time; 100-kΩ-to-GND disables soft-start. |
| 5 RT | Mode select / frequency set | Short to GND = PFM mode; resistor-to-GND (e.g., 100 kΩ) = COT mode with ~200 kHz switching. |
| 6 PGOOD | Power-good flag | Open-drain NFET output; pulls low if VOUT deviates >6% from regulation; requires 10–100 kΩ pull-up to ≤12 V. |
| 7 EN | Enable / UVLO input | Active-high enable with 1.22 V threshold and 76 mV hysteresis; supports precise input voltage sequencing. |
| 8 VOUT | Fixed output connection | Internal 3.3-V divider output node; connects directly to output capacitor; not a feedback input. |
| 9 HYS | UVLO hysteresis control | Drain of internal NFET; external R-HYS–R-EN network programs VIN UVLO turn-on/off thresholds. |
| 10 GND | Ground return | Power and signal ground; thermal pad must be soldered to large copper pour for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high- and low-side MOSFETs | 1-Ω P-FET + 0.5-Ω N-FET eliminate external power components and reduce BOM count by ≥4 parts. |
| Diode emulation & pulse skipping | Enables >85% efficiency at 0.1 mA load (VIN = 12 V), critical for battery-powered wake-on-event systems. |
| No loop compensation required | Both COT and PFM modes achieve stable regulation without external compensation networks or design iteration. |
| 100% duty-cycle operation | Supports dropout as low as 300 mV (at 500 mA), enabling 3.3-V output from 3.6-V Li-ion or 5-V USB inputs. |
| Open-drain PGOOD with hysteresis | Provides reliable power sequencing and fault reporting with 7% window (87–94% of FB threshold) to reject noise. |
Applications
| Factory Automation Sensor Node | Automotive Body Control Module |
|---|---|
Use Scenario: Powering 3.3-V RS-485 transceivers and microcontrollers in DIN-rail mounted PLC I/O modules operating from 24-V DC bus. IC Role / Device Role / Timing Role: Primary 24-V-to-3.3-V buck regulator delivering 300 mA continuous current with <100-µA sleep IQ for watchdog timer circuits. Use Value: Enables >10-year battery backup life during mains failure and meets EN55022 radiated emissions limits without ferrite beads. |
Use Scenario: Supplying 3.3-V logic rails for door module MCUs and LIN transceivers in 12-V automotive systems with cold-crank down to 3.2 V. IC Role / Device Role / Timing Role: Input-robust buck converter maintaining regulation during cranking transients; uses 100% duty cycle to sustain output when VIN drops below 3.6 V. Use Value: Eliminates need for external LDO post-regulator and reduces thermal stress on downstream ICs during extended cranking events. |
| Industrial IoT Edge Gateway | High-Voltage LDO Replacement |
Use Scenario: Generating 3.3-V bias for ARM Cortex-M7 MCU, Wi-Fi SoC, and analog front-end in sealed outdoor gateways powered from 48-V PoE++ or solar charge controllers. IC Role / Device Role / Timing Role: Main system regulator handling 0.01–500 mA dynamic load profile; leverages PFM mode for sub-10-µA idle current during deep sleep. Use Value: Achieves 90% efficiency at 10 mA (VIN = 48 V), cutting heat dissipation by 4× versus linear regulators and enabling fanless enclosure design. |
Use Scenario: Replacing inefficient 78L33 linear regulators in legacy 24-V or 36-V industrial equipment requiring clean 3.3-V logic supply. IC Role / Device Role / Timing Role: Drop-in efficiency upgrade delivering same 3.3-V output with 500-mA capability and 9.7-µA quiescent draw instead of 5-mA LDO IQ. Use Value: Reduces board temperature rise by 25°C at full load and extends service life of electrolytic input/output capacitors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5165YDRCR | Pin-to-pin compatible; identical 3.3-V fixed output but rated for 150°C max junction (vs. 150°C for LM5166Y); same IQ and efficiency curves. | Same use cases; selected when full 150°C qualification is explicitly required per AEC-Q100 or MIL-STD-810G. | Choose LM5165YDRCR only if full automotive-grade thermal validation documentation is mandatory. |
| TPS54202HDDCR | 2.5–60-V input, 2-A output, 28-µA IQ; uses external MOSFETs; requires compensation; no PFM mode; 14-pin SOIC package. | Suitable for higher-current designs (>500 mA) where board space allows larger package and layout complexity is acceptable. | Select TPS54202HDDCR when output current demand exceeds 500 mA and thermal headroom permits SOIC footprint. |
Compared with LM5165YDRCR and TPS54202HDDCR, the LM5166YDRCR offers superior light-load efficiency (9.7 µA vs. 18 µA), smaller VSON footprint, and simpler implementation - making it optimal for space-constrained, battery-sensitive 3.3-V systems requiring robust 65-V input tolerance.
Availability
LM5166YDRCR is available at Aetrix Electronics and suitable for factory automation sensor nodes, automotive body control modules, and industrial IoT edge gateways requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM5166YDRCR 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 LM5166YDRCR belongs to TI's LM5166 family of ultra-low-IQ buck converters designed specifically for wide-input industrial and automotive power supplies where efficiency at microamp loads and 65-V surge tolerance are critical.
FAQ
What is the maximum input voltage rating for the LM5166YDRCR?
The LM5166YDRCR has an absolute maximum input voltage rating of 68 V and a recommended operating maximum of 65 V. This allows safe operation across 48-V industrial buses and automotive systems with load-dump transients up to 65 V, provided proper input filtering is implemented per TI SNVSA67B Section 10.
Does the LM5166YDRCR require external compensation components?
No, the LM5166YDRCR does not require external compensation components. Its constant-on-time (COT) and pulse-frequency modulation (PFM) control architectures provide inherent stability across all input voltages and load conditions - eliminating the need for compensation capacitors or resistors in the feedback loop.
How is the current limit configured on the LM5166YDRCR?
The LM5166YDRCR current limit is configured using a resistor from the ILIM pin to GND: 0 Ω selects 500 mA, 33.2 kΩ selects 300 mA, and 100 kΩ selects 200 mA. These settings correspond to high-side peak current thresholds of 500 mA, 300 mA, and 200 mA respectively, as defined in Table 3 of the LM5166 datasheet.
What is the purpose of the HYS pin on the LM5166YDRCR?
The HYS pin on the LM5166YDRCR is the drain terminal of an internal NFET used to program input UVLO hysteresis. By connecting two external resistors - one from HYS to EN and another from EN to GND - designers set precise turn-on and turn-off thresholds for VIN, enabling customized brown-out protection without additional comparators.
Can the LM5166YDRCR operate with 100% duty cycle, and why does that matter?
Yes, the LM5166YDRCR supports 100% duty cycle operation due to its integrated P-channel high-side switch. This allows regulation even when input voltage drops close to the output voltage (e.g., 3.6 V → 3.3 V), eliminating dropout-related system resets in battery-powered applications during deep discharge or cold-cranking events.
LM5166YDRCR 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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 65V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- 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)
LM5166YDRCR FAQ
1.How can I place an order for LM5166YDRCR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5166YDRCR 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 LM5166YDRCR reliable?
The price and inventory of LM5166YDRCR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5166YDRCR is usually 5 days.
3.What payment methods are accepted for LM5166YDRCR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5166YDRCR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5166YDRCR?
LM5166YDRCR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5166YDRCR 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 LM5166YDRCR?
For technical support, including LM5166YDRCR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5166YDRCR requirements.
6.How does Aetrix verify that LM5166YDRCR is sourced from the original manufacturer or authorized distributors?
All LM5166YDRCR 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 LM5166YDRCR meets industry standards.
7.What is the process for return or replacement of LM5166YDRCR?
All LM5166YDRCR units undergo pre-shipment inspection (PSI). If there is an issue with LM5166YDRCR, 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 LM5166YDRCR part is unused and in its original packaging.
Return procedure for LM5166YDRCR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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