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Texas Instruments LMR14020SDDAR
- Part No.:
- LMR14020SDDAR
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMR14020SDDAR.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:4,973
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Product details
Overview
LMR14020SDDAR from Texas Instruments is a 40V input, 2A synchronous step-down DC-DC converter with integrated 90mΩ high-side MOSFET, 40µA quiescent current, and 2.2MHz switching capability in an 8-pin HSOIC PowerPAD™ package. It delivers regulated power for automotive battery regulation, industrial supplies, and battery-powered systems requiring ultra-low sleep-mode IQ.
For engineers reviewing the LMR14020SDDAR datasheet, LMR14020SDDAR pinout, LMR14020SDDAR application, or LMR14020SDDAR equivalent, key selection criteria include input voltage range (4–40V), output current capability (2A continuous), minimum on-time (75ns), frequency synchronization support, and thermal shutdown threshold (170°C).
Technical Context
The LMR14020SDDAR implements fixed-frequency peak current mode control with internal compensation and sleep-mode operation at light load to maintain high efficiency. Its architecture integrates a bootstrap gate driver, precision 0.75V feedback reference, and cycle-by-cycle current limiting.
It supports dual-mode RT/SYNC pin operation: resistor-programmed frequency (200kHz–2.5MHz) or external clock synchronization (250kHz–2.3MHz). The device features adjustable UVLO via EN divider, programmable soft-start, and 97% maximum duty cycle enabled by BOOT capacitor recharge circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 40V - supports direct connection to automotive batteries (12V/24V/36V) and industrial unregulated rails without pre-regulation. |
| Output Current | 2A continuous - sufficient for powering microcontrollers, sensors, and communication ICs in embedded systems. |
| Quiescent Current | 40µA - enables >1-year battery life in always-on IoT nodes with 100mAh coin cell under light-load sleep mode. |
| Switching Frequency | Up to 2.2MHz - allows use of sub-10µH inductors and compact 0805/1206 ceramic capacitors for space-constrained PCB layouts. |
| High-Side RDS(on) | 90mΩ typical - reduces conduction loss at 2A load, enabling >90% efficiency at 12V→5V conversion. |
| Min. On-Time | 75ns - supports high VIN/VOUT ratios (e.g., 36V→3.3V) without pulse-skipping, ensuring stable regulation in dropout conditions. |
| Feedback Reference | 0.750V ±1.2% - enables precise output voltage setting (e.g., 3.3V ±1%) using standard 1% resistors. |
| Thermal Shutdown | 170°C junction - protects against sustained overload or poor heatsinking while allowing full 125°C continuous operation. |
Pinout & Package
Package: 8-pin HSOIC with exposed thermal pad (DDA), 4.9mm × 6mm footprint, designed for enhanced thermal dissipation via PCB ground plane connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap supply | Connects 0.1µF X7R ceramic capacitor to SW; provides gate drive voltage for high-side MOSFET during high-duty-cycle operation. |
| VIN | Main power input | Accepts 4–40V input; requires low-ESR bulk and high-frequency bypass capacitors placed adjacent to pin for stability. |
| EN | Enable control | Precision enable with 1.2V threshold and hysteresis; supports system-level UVLO programming via external resistor divider. |
| RT/SYNC | Frequency control | Dual-function pin: sets switching frequency via RT resistor (200kHz–2.5MHz) or accepts external sync clock (250kHz–2.3MHz). |
| FB | Feedback input | Monitors output voltage via resistor divider; internal 0.75V reference enables accurate VOUT regulation across temperature. |
| SS | Soft-start control | External capacitor sets ramp-up time; internal 3µA current source prevents inrush current during power-up. |
| GND | System ground | Reference for all analog and power circuits; must be connected to low-impedance PCB ground plane. |
| SW | Power switch node | Drives external inductor; connects internally to high-side MOSFET drain; requires tight layout to minimize EMI and ringing. |
| Thermal Pad | Heat dissipation path | Exposed copper pad beneath package; must be soldered to solid PCB ground plane for RθJA = 43.2°C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| Internal compensation | Eliminates need for external loop compensation components, reducing BOM count and design iteration time. |
| Frequency synchronization | Enables noise-sensitive applications (e.g., ADCs, RF modules) to avoid beat frequencies by locking to system clock. |
| 97% max duty cycle | Supports ultra-low dropout operation (e.g., 5.5V→5V) without external bootstrap diode or charge pump. |
| 1µA shutdown current | Extends shelf life and standby duration in battery-critical applications such as medical wearables and remote sensors. |
| OVP with 109% threshold | Clamps output overshoot during load transients or fault recovery, protecting downstream 3.3V/5V logic from overvoltage damage. |
| Cycle-by-cycle current limit | Provides immediate protection against short-circuit events without latch-up, enabling robust field operation. |
Applications
| Automotive Battery Regulation | Industrial Power Supplies |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery to stable 5V/3.3V for infotainment MCU and CAN transceivers under cold-crank (4.5V) and load-dump (40V) conditions. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, ripple-controlled power domain with UVLO hysteresis and thermal resilience. Use Value: Maintains system operation across automotive-grade voltage extremes while consuming only 40µA in sleep mode during ignition-off. | Use Scenario: Powering PLC I/O modules and sensor interfaces from 24V factory bus with strict EMI limits and long service life requirements. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with 2.2MHz operation to avoid AM radio band and simplify filtering. Use Value: Enables compact 12mm² solution size with >92% efficiency at 1A, reducing heat sink needs and board area cost. |
| Telecom/Datacom Systems | Battery-Powered Systems |
Use Scenario: Generating 3.3V from 48V intermediate bus in optical line cards where board space and thermal density are constrained. IC Role / Device Role / Timing Role: Synchronized buck converter locked to system clock to eliminate switching noise coupling into high-speed SerDes lanes. Use Value: Achieves <−65dBc conducted EMI at 100MHz with 2.2MHz sync, meeting EN55022 Class B without added shielding. | Use Scenario: Supplying ultra-low-power wireless sensor node (BLE/Matter) from single Li-ion cell (3.0–4.2V) or two alkaline cells (1.8–3.2V). IC Role / Device Role / Timing Role: Wide-input buck with 40µA IQ and 1µA shutdown, enabling multi-year operation on 200mAh battery. Use Value: Delivers 2A peak current for radio transmission bursts while maintaining <100nA average system current in deep sleep. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR14030SDDAR | 3.5A output current, same 4–40V input, identical pinout and package | Higher load capacity required for FPGA core rails or multi-rail PMIC front-end | Select when >2A continuous current or higher transient headroom is needed; drop-in upgrade with no layout change. |
| TPS54240DGQR | 3.5–40V input, 2A, 2.5MHz max fSW, but 100µA IQ and no SYNC capability | Cost-sensitive industrial designs where EMI synchronization is not required | Choose for lower BOM cost where 40µA IQ and clock sync are non-critical; requires revalidation of loop stability. |
Compared with LMR14020SDDAR, LMR14030SDDAR offers higher current headroom in identical footprint, while TPS54240DGQR trades ultra-low IQ and sync flexibility for lower unit cost-making each suitable for distinct power budget and system timing constraints.
Availability
LMR14020SDDAR is available at Aetrix Electronics and suitable for automotive battery regulation, industrial power supplies, and telecom/datacom systems requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned reliability.
Supply support for LMR14020SDDAR 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 delivering analog and embedded processing solutions, with over 90 years of innovation in power management ICs.
The LMR14020SDDAR belongs to TI's SIMPLE SWITCHER® family-designed specifically for ease-of-use, minimal external component count, and robust operation in harsh environments like automotive and industrial settings.
FAQ
What is the absolute maximum input voltage rating for the LMR14020SDDAR?
The LMR14020SDDAR has an absolute maximum VIN-to-GND rating of 44V, per its datasheet Absolute Maximum Ratings table. This exceeds its recommended 4–40V operating range and provides margin for transient spikes such as automotive load dump. Operation above 40V is not guaranteed for regulation or reliability, and prolonged exposure above 44V may cause permanent damage.
Does the LMR14020SDDAR support synchronization to an external clock signal?
Yes, the LMR14020SDDAR supports external clock synchronization via its RT/SYNC pin. When driven with a square wave between 250kHz and 2.3MHz, the internal PLL locks to the falling edge of the input clock. The pin automatically switches from resistor-programmed mode to sync mode when pulled above the PLL upper threshold (typically >1.7V), enabling deterministic switching in noise-sensitive systems.
What is the purpose of the BOOT pin on the LMR14020SDDAR, and what capacitor value is recommended?
On the LMR14020SDDAR, the BOOT pin supplies gate drive voltage to the integrated high-side MOSFET. A 0.1µF X7R or X5R ceramic capacitor must be placed between BOOT and SW pins. TI specifies this value to ensure sufficient charge storage for reliable high-side switching up to 97% duty cycle, especially during low-VIN dropout conditions.
How does the LMR14020SDDAR achieve 40µA quiescent current, and in which operating mode does this apply?
The LMR14020SDDAR achieves 40µA quiescent current in its sleep mode-activated automatically at light loads when peak inductor current falls below ~300mA. In this state, switching halts, the COMP voltage is clamped at 400mV, and only bias circuitry remains active. This mode directly enables multi-year battery life in always-on applications, as confirmed in Section 5.5 Electrical Characteristics.
Can the LMR14020SDDAR operate with an output voltage lower than 0.8V?
No, the LMR14020SDDAR is not specified to regulate output voltages below 0.8V. Its feedback reference is trimmed to 0.750V ±1.2%, and the datasheet's Recommended Operating Conditions list VOUT minimum as 0.8V. Attempting sub-0.8V operation risks instability, inaccurate regulation, or failure to maintain feedback loop control due to comparator offset limitations.
LMR14020SDDAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- 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):
- 4V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 28V
- Current - Output:
- 2A
- Frequency - Switching:
- 200kHz ~ 2.5MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LMR14020SDDAR FAQ
1.How can I place an order for LMR14020SDDAR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR14020SDDAR 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 LMR14020SDDAR reliable?
The price and inventory of LMR14020SDDAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR14020SDDAR is usually 5 days.
3.What payment methods are accepted for LMR14020SDDAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR14020SDDAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR14020SDDAR?
LMR14020SDDAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR14020SDDAR 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 LMR14020SDDAR?
For technical support, including LMR14020SDDAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR14020SDDAR requirements.
6.How does Aetrix verify that LMR14020SDDAR is sourced from the original manufacturer or authorized distributors?
All LMR14020SDDAR 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 LMR14020SDDAR meets industry standards.
7.What is the process for return or replacement of LMR14020SDDAR?
All LMR14020SDDAR units undergo pre-shipment inspection (PSI). If there is an issue with LMR14020SDDAR, 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 LMR14020SDDAR part is unused and in its original packaging.
Return procedure for LMR14020SDDAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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