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Texas Instruments LM5166XDRCR
- Part No.:
- LM5166XDRCR
- Manufacturer:
- Texas Instruments
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
LM5166XDRCR.pdf
- Description:
- IC REG BUCK 5V 500MA 10VSON
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM5166XDRCR from Texas Instruments is a 3-V to 65-V input, 500-mA synchronous buck converter with fixed 5-V output, integrated 1-Ω P-channel high-side and 0.5-Ω N-channel low-side MOSFETs, 9.7-µA no-load quiescent current, and 10-pin VSON (3 mm × 3 mm) package. It delivers regulated 5-V power in industrial automation sensors, automotive body electronics, and high-voltage LDO replacements where wide VIN range and ultra-low IQ are critical.
For engineers reviewing the LM5166XDRCR datasheet, LM5166XDRCR pinout, LM5166XDRCR application, or LM5166XDRCR equivalent, key selection factors include its 100% duty-cycle capability for low-dropout operation, selectable COT/PFM control modes, programmable current limit (200/300/500 mA), open-drain PGOOD indicator, and EN/UVLO with hysteresis - all verified across –40°C to 150°C junction temperature.
Technical Context
The LM5166XDRCR uses a constant-on-time (COT) or pulse-frequency-modulation (PFM) control architecture with no loop compensation required. Its integrated high-side P-FET enables 100% duty cycle, eliminating bootstrap capacitor needs and supporting ultra-low dropout at high VIN-to-VOUT ratios.
Internal 1.223-V ±1.2% reference feeds a precision FB comparator; PGOOD monitors regulation status via an open-drain NFET; ILIM pin selects peak current limit (500 mA nominal); RT pin configures switching frequency up to 600 kHz or selects PFM mode; SS pin supports internal 900-µs or external soft-start.
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 rails and automotive battery systems without pre-regulation. |
| Output Voltage | Fixed 5 V ±2% - internally trimmed; eliminates external feedback resistors and reduces BOM count. |
| Max Output Current | 500 mA - sustained DC load capability with thermal shutdown protection at 170°C. |
| No-Load Quiescent Current | 9.7 µA - enables >10-year battery life in always-on IoT sensor nodes powered by coin cells or energy harvesters. |
| Switching Frequency | Up to 600 kHz - allows use of compact 4.7–150 µH inductors; adjustable via RT resistor or disabled for PFM operation. |
| Package | 10-pin VSON (3 mm × 3 mm, 0.5-mm pitch) - thermally enhanced exposed pad; RθJA = 49.1°C/W enables high-power-density layouts. |
| Operating Junction Temp | –40°C to 150°C - qualified for under-hood automotive, factory floor, and outdoor industrial environments. |
Pinout & Package
LM5166XDRCR uses a 10-pin VSON (DRC) package with 3 mm × 3 mm footprint and 0.5-mm pin pitch. The exposed thermal pad must be soldered to PCB ground for optimal thermal performance (RθJB = 26.6°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switching node | Drain connection of internal P-FET and N-FET; connects directly to buck inductor; requires low-inductance layout. |
| 2 VIN | Input supply rail | Primary power input for high-side FET and internal bias LDO; must connect to local 2.2-µF ceramic capacitor with minimal trace length. |
| 3 ILIM | Current limit programming | GND-referenced resistor sets peak current limit to 200/300/500 mA; determines inductor saturation margin and short-circuit response. |
| 4 SS | Soft-start timing | Open = 900-µs internal ramp; capacitor to GND extends soft-start; resistor to GND disables soft-start for immediate enable. |
| 5 RT | Mode select & on-time programming | GND = PFM mode; resistor to GND sets COT frequency (e.g., 100 kΩ ≈ 200 kHz); enables optimization of efficiency vs EMI. |
| 6 PGOOD | Power-good flag | Open-drain NFET output; pulled high externally (10–100 kΩ) to indicate VOUT regulation within ±5% of 5 V. |
| 7 EN | Enable / UVLO input | Active-high logic input; 1.22 V threshold with 76-mV hysteresis ensures clean startup/shutdown during brownout conditions. |
| 8 VOUT | Fixed 5-V output tap | Internally connected to feedback divider; provides direct access to regulated 5-V rail for local bypassing or sequencing. |
| 9 HYS | UVLO hysteresis programming | Drain of internal NFET; external resistor divider between HYS–EN–GND sets custom input UVLO thresholds and hysteresis. |
| 10 GND | Power and signal ground | Common return for all circuits; must be tied to thermal pad and low-impedance system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated P-FET + N-FET | Eliminates external diode and gate-drive components; 1-Ω high-side + 0.5-Ω low-side MOSFETs enable >90% efficiency at 100 mA with 24-V input. |
| Diode emulation & pulse skipping | Enables ultra-high light-load efficiency (>80% at 0.1 mA) in PFM mode without audible switching noise or output voltage ripple increase. |
| No loop compensation required | Reduces design time and bill-of-materials: no external compensation network needed for stable operation across full line/load/temperature range. |
| 100% duty cycle support | Permits dropout as low as 100 mV at 500 mA; enables reliable 5-V output from 5.5-V input sources such as partially discharged batteries. |
| EN/UVLO with programmable hysteresis | HYS pin allows custom UVLO thresholds (e.g., 24-V nominal rail with 21-V turn-on/19-V turn-off) for robust system-level power sequencing. |
Applications
| Factory Automation Sensor Node | Automotive Body Control Module |
|---|---|
Use Scenario: Powering 4–20 mA loop transmitters and IO-Link devices in harsh industrial environments with 24-V DC supply rails subject to surges and brownouts. IC Role / Device Role / Timing Role: Primary 5-V bias regulator delivering 300–500 mA to microcontroller, ADC, and analog front-end; handles 65-V transients per IEC 61000-4-5 Level 4. Use Value: 9.7-µA IQ extends battery backup runtime; 150°C junction rating ensures reliability near motors and drives; PGOOD enables safe firmware boot sequence. |
Use Scenario: Replacing discrete LDOs in door modules, seat controllers, and lighting ECUs powered from 12-V vehicle battery with cold-crank (4.5 V) and load-dump (65 V) events. IC Role / Device Role / Timing Role: Main 5-V domain regulator for MCU, CAN transceiver, and LED drivers; withstands automotive ISO 7637-2 pulses without external TVS. Use Value: 100% duty cycle maintains 5-V output during cold-crank; EN/UVLO hysteresis prevents reset oscillation; VSON package fits tight space constraints. |
| High-Voltage LDO Replacement | Low-Power IoT Edge Node |
Use Scenario: Substituting inefficient linear regulators in 36-V or 48-V telecom and PoE-powered equipment requiring clean 5-V for management ASICs and PHYs. IC Role / Device Role / Timing Role: Efficient step-down converter replacing 7805-style LDOs; operates at 200–600 kHz to avoid AM radio band interference. Use Value: >85% efficiency at full load cuts thermal dissipation by >80% vs LDO; meets EN55022 Class B EMI limits with simple input filter. |
Use Scenario: Powering wireless sensor nodes (BLE/Zigbee) harvesting energy from solar, thermal, or RF sources with intermittent 3–65-V input profiles. IC Role / Device Role / Timing Role: Ultra-low-IQ buck regulator enabling multi-year operation on microampere-scale harvested power; PFM mode minimizes switching losses at sub-mA loads. Use Value: 9.7-µA sleep current dominates system budget; SS pin allows synchronization to wake-up events; small VSON footprint saves PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5165XDRCT | Pin-to-pin compatible; identical 3–65 V input, 500 mA, 5-V fixed output; same VSON-10 package; differs only in tape-and-reel packaging (DRCT vs DRCR). | No functional difference; DRCT is 250-unit reel variant; DRCR is 3000-unit reel variant - both electrically and thermally identical. | Select LM5165XDRCT only if smaller reel size aligns with prototyping or low-volume production requirements. |
| TPS54202HDDCR | Lower input range (4.5–17 V), higher IQ (22 µA), 2-A output; uses different control scheme (current-mode PWM) requiring external compensation; SOIC-8 package. | Suitable for 12-V systems only; cannot replace LM5166XDRCR in 24/48-V or cold-crank automotive applications due to VIN limitation and lack of 100% duty cycle. | Choose TPS54202HDDCR only for cost-sensitive 12-V designs needing >500 mA; not a drop-in replacement for wide-VIN or ultra-low-IQ use cases. |
Compared with LM5165XDRCT, LM5166XDRCR offers identical electrical performance but targets high-volume production with larger reels; versus TPS54202HDDCR, it provides 3× wider input range, 2.3× lower quiescent current, and 100% duty cycle - making it uniquely suited for industrial and automotive step-down from unregulated rails.
Availability
LM5166XDRCR is available at Aetrix Electronics and suitable for factory automation sensors, automotive body electronics, and high-voltage LDO replacement applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LM5166XDRCR 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 automotive and industrial qualification expertise.
The LM5166 family was designed specifically for wide-input-voltage, ultra-low-quiescent-current DC-DC conversion in space-constrained, thermally demanding applications such as industrial sensors and automotive ECUs.
FAQ
What is the maximum input voltage rating for the LM5166XDRCR?
The LM5166XDRCR 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 automotive load-dump transients without external clamping. Operation at 65 V is fully characterized across temperature and load, with validated thermal performance in the VSON package.
Does the LM5166XDRCR require external compensation components?
No, the LM5166XDRCR does not require external compensation components. Its constant-on-time (COT) and pulse-frequency-modulation (PFM) control architectures are inherently stable across the full operating range - from 3 V to 65 V input, 0–500 mA load, and –40°C to 150°C junction temperature - eliminating the need for compensation networks and reducing design complexity.
How is the current limit configured on the LM5166XDRCR?
The LM5166XDRCR uses the ILIM pin to configure peak current limit: connecting a resistor from ILIM to GND selects 200 mA, 300 mA, or 500 mA. For the standard 500-mA configuration, ILIM is left open. This resistor-based selection optimizes inductor sizing and short-circuit response without changing the IC's internal circuitry or requiring firmware updates.
Can the LM5166XDRCR operate with 100% duty cycle?
Yes, the LM5166XDRCR supports true 100% duty cycle operation using its integrated P-channel high-side MOSFET. This enables dropout voltages as low as 100 mV at 500 mA, allowing stable 5-V output even when input falls to 5.1 V - critical for cold-crank scenarios in automotive applications and brownout resilience in industrial systems.
What is the purpose of the HYS pin on the LM5166XDRCR?
The HYS pin on the LM5166XDRCR is the drain terminal of an internal NFET used to program custom input UVLO thresholds and hysteresis. By adding external resistors between HYS, EN, and GND, designers can set precise turn-on/turn-off voltages (e.g., 24-V nominal rail with 21-V ON / 19-V OFF), enabling robust power sequencing and immunity to supply noise.
LM5166XDRCR 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):
- 5V
- 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)
LM5166XDRCR FAQ
1.How can I place an order for LM5166XDRCR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5166XDRCR 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 LM5166XDRCR reliable?
The price and inventory of LM5166XDRCR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5166XDRCR is usually 5 days.
3.What payment methods are accepted for LM5166XDRCR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5166XDRCR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5166XDRCR?
LM5166XDRCR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5166XDRCR 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 LM5166XDRCR?
For technical support, including LM5166XDRCR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5166XDRCR requirements.
6.How does Aetrix verify that LM5166XDRCR is sourced from the original manufacturer or authorized distributors?
All LM5166XDRCR 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 LM5166XDRCR meets industry standards.
7.What is the process for return or replacement of LM5166XDRCR?
All LM5166XDRCR units undergo pre-shipment inspection (PSI). If there is an issue with LM5166XDRCR, 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 LM5166XDRCR part is unused and in its original packaging.
Return procedure for LM5166XDRCR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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