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Texas Instruments LMR14020SDDA
- Part No.:
- LMR14020SDDA
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMR14020SDDA.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:916
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Product details
Overview
LMR14020SDDA from Texas Instruments is a 40V input, 2A synchronous step-down DC-DC converter with integrated 90mΩ high-side MOSFET, 40µA quiescent current, 2.2MHz switching capability, and internal compensation - designed for automotive battery regulation and industrial power supplies where compact size and ultra-low standby power are critical.
For engineers reviewing the LMR14020SDDA datasheet, LMR14020SDDA pinout, LMR14020SDDA application, or LMR14020SDDA equivalent, key selection criteria include input voltage range (4–40V), output current capability (2A continuous), minimum on-time (75ns), thermal shutdown threshold (170°C), and RT/SYNC pin dual-mode frequency control (200kHz–2.5MHz resistor-programmed or 250kHz–2.3MHz synchronized).
Technical Context
The LMR14020SDDA implements fixed-frequency peak current mode control with sleep-mode operation at light load to maintain high efficiency. It uses internal slope compensation to prevent sub-harmonic oscillation above 50% duty cycle and features a precision 0.75V feedback reference with ±1.2% tolerance over temperature.
Its bootstrap circuit enables up to ~97% effective duty cycle in dropout conditions, while cycle-by-cycle current limiting (2.5–3.8A typical), output overvoltage protection (109% VREF trip), and thermal shutdown (170°C) provide robust fault handling without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 40V - supports direct connection to automotive batteries (12V/24V systems) and industrial rails without pre-regulation. |
| Output Current | 2A continuous - sufficient for powering microcontrollers, sensors, and communication ICs in embedded systems. |
| Quiescent Current | 40µA - enables multi-year battery life in always-on monitoring applications such as telematics or remote sensors. |
| Switching Frequency | 2.2MHz - allows use of small 2.2µH inductors and 10–22µF ceramic output capacitors for space-constrained PCB layouts. |
| High-Side RDS(on) | 90mΩ (typical) - reduces conduction loss and thermal stress at full load, enabling operation without heatsink in moderate airflow. |
| Feedback Reference | 0.750V ±1.2% - ensures accurate output voltage regulation across –40°C to +125°C junction temperature range. |
| Min. On-Time | 75ns - supports high step-down ratios (e.g., 36V→3.3V) at 2.2MHz without pulse-skipping instability. |
Pinout & Package
LMR14020SDDA is housed in an 8-pin HSOIC package (DDA) with exposed thermal pad (4.9mm × 6mm), optimized for thermal dissipation via PCB copper area connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap supply node | Drives high-side MOSFET gate; requires 0.1µF X7R/X5R ceramic capacitor to SW for stable 5V gate drive under all duty cycles. |
| VIN | Main power input | Accepts 4–40V unregulated input; must be decoupled with low-ESR ceramic capacitor placed within 3mm of pin. |
| EN | Enable control input | Precision enable with 1.2V threshold and hysteresis; supports system-level UVLO using external resistor divider. |
| RT/SYNC | Frequency programming/sync input | Dual-function pin: resistor-to-GND sets fSW (200kHz–2.5MHz); external clock (250kHz–2.3MHz) overrides for EMI reduction. |
| FB | Feedback sensing input | Monitors output via resistor divider; internal 0.75V reference enables adjustable VOUT from 0.8V to 28V. |
| SS | Soft-start timing node | 3µA internal current charges external capacitor to control output ramp time and limit inrush current. |
| GND | Power and signal ground | Common return path; connects to thermal pad for primary heat transfer to PCB ground plane. |
| SW | Power switch node | Connects to inductor; carries high di/dt switching current - requires short, wide trace and Kelvin return to minimize noise. |
Key Features
| Feature | Design Value |
|---|---|
| Internal compensation | Eliminates need for external loop compensation components - reduces BOM count and design iteration time. |
| Frequency synchronization | Enables EMI reduction by locking switching edges to system clock - avoids beat frequencies in multi-rail power systems. |
| Thermal shutdown with hysteresis | Shuts down at 170°C junction temperature and restarts only after cooling by ≥12°C - prevents thermal runaway during overload. |
| Adjustable soft-start | External capacitor sets controlled VOUT ramp rate - prevents inrush into large capacitive loads or downstream LDOs. |
| Low shutdown current | 1µA max shutdown current - preserves battery energy during system sleep modes in portable and automotive applications. |
Applications
| Automotive Battery Regulation | Industrial Power Supplies |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery to 5V/3.3V for infotainment MCU, CAN transceiver, and sensor clusters. IC Role / Device Role / Timing Role: Primary buck regulator delivering 2A continuous power with 40µA quiescent current to meet ISO 16750-2 cold-cranking and sleep-mode requirements. Use Value: Maintains system operation during engine start (VIN dip to 4V) and extends battery life in parked state via ultra-low IQ. | Use Scenario: Powering PLC I/O modules, fieldbus gateways, and industrial HMIs from 24V DC rails with high reliability. IC Role / Device Role / Timing Role: Compact, thermally robust DC-DC stage replacing discrete buck controllers and external MOSFETs. Use Value: Achieves >90% efficiency at 1A load with 2.2MHz switching - eliminates need for heatsinks and reduces board area by 40% vs. lower-frequency alternatives. |
| Telecom/Datacom Systems | Battery-Powered Systems |
Use Scenario: Generating intermediate 5V rail from 48V backplane in PoE-powered switches and base station radios. IC Role / Device Role / Timing Role: High-input-voltage buck converter supporting wide VIN range and synchronized switching to suppress conducted EMI. Use Value: RT/SYNC pin enables alignment with system clock - reducing spectral peaks in FCC Class B emissions testing. | Use Scenario: Powering wireless sensor nodes, asset trackers, and portable medical devices from single Li-ion or 2xAA cells. IC Role / Device Role / Timing Role: Efficient step-down regulator operating from 4V–40V input, supporting both battery and adapter inputs. Use Value: 40µA IQ and 1µA shutdown current extend operational lifetime to >5 years in low-duty-cycle IoT deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR14030SDDA | 3.5A output current, same 4–40V input, identical pinout and package | Higher current headroom for future-proofing or transient-heavy loads (e.g., motor drivers) | Select when >2A peak load or higher thermal margin is required; drop-in replacement with no layout change. |
| TPS54240DGQ | 3.5A, 4–40V input, but uses external MOSFETs and requires full loop compensation | Greater flexibility in MOSFET selection and efficiency optimization at cost of design complexity and component count | Choose when custom FET selection, higher efficiency at specific loads, or discrete control is needed - not pin-compatible. |
Compared with LMR14020SDDA, LMR14030SDDA offers higher current capacity in identical footprint for seamless scalability, while TPS54240DGQ trades integration for design flexibility - requiring external FETs and compensation but enabling tailored performance in demanding industrial environments.
Availability
LMR14020SDDA 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 consistent parametric performance across production batches.
Supply support for LMR14020SDDA 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 technologies, with decades of experience in automotive-grade and industrial-reliability IC design.
The LMR14020SDDA belongs to TI's SIMPLE SWITCHER® family - engineered for ease-of-use in rugged DC-DC conversion applications, emphasizing integrated functionality, thermal robustness, and minimal external component count for rapid power system deployment.
FAQ
What is the maximum input voltage rating for the LMR14020SDDA?
The LMR14020SDDA has an absolute maximum input voltage rating of 44V on the VIN pin, with recommended operating range from 4V to 40V. Exceeding 44V risks permanent damage per the Absolute Maximum Ratings table. The device is specifically designed for automotive and industrial applications where input transients up to 40V occur regularly, such as cold-crank events or 24V system surges.
Does the LMR14020SDDA require external compensation components?
No, the LMR14020SDDA features fully internal compensation - eliminating the need for external Type-II or Type-III compensation networks. This simplifies design, reduces bill-of-materials count, and ensures stable operation across all supported output capacitor types (including ceramic, polymer, and electrolytic), as confirmed in Section 6.3.1 and Table 5.5 of the official datasheet.
How does the LMR14020SDDA achieve ultra-low quiescent current?
The LMR14020SDDA achieves 40µA typical quiescent current through dedicated sleep-mode circuitry that disables switching and gate drive while maintaining regulation via periodic wake-up bursts. In shutdown mode, it draws just 1µA - verified in Section 5.5 Electrical Characteristics under ISHDN test condition - making it ideal for battery-backed systems where standby power is critical.
Can the LMR14020SDDA synchronize to an external clock, and what are the valid frequency ranges?
Yes, the LMR14020SDDA supports synchronization via its RT/SYNC pin across 250kHz to 2.3MHz, with defined logic thresholds (VSYNC_HI ≥ 1.7V, VSYNC_LO ≤ 0.5V) and minimum pulse width (30ns). When synchronized, the internal oscillator locks to the falling edge of the external clock - enabling precise EMI management in multi-converter systems without modifying the LMR14020SDDA's core architecture.
What thermal performance can be expected from the LMR14020SDDA in the DDA package?
In the 8-pin HSOIC DDA package with properly designed PCB thermal land (≥4 cm² copper connected to thermal pad), the LMR14020SDDA achieves a junction-to-ambient thermal resistance (RθJA) of 43.2°C/W. At 2A load and 12V input, this enables reliable operation up to +125°C ambient without forced airflow - validated in Section 5.4 Thermal Information and Figure 5-1 efficiency curves.
LMR14020SDDA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
LMR14020SDDA FAQ
1.How can I place an order for LMR14020SDDA through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR14020SDDA 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 LMR14020SDDA reliable?
The price and inventory of LMR14020SDDA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR14020SDDA is usually 5 days.
3.What payment methods are accepted for LMR14020SDDA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR14020SDDA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR14020SDDA?
LMR14020SDDA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR14020SDDA 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 LMR14020SDDA?
For technical support, including LMR14020SDDA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR14020SDDA requirements.
6.How does Aetrix verify that LMR14020SDDA is sourced from the original manufacturer or authorized distributors?
All LMR14020SDDA 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 LMR14020SDDA meets industry standards.
7.What is the process for return or replacement of LMR14020SDDA?
All LMR14020SDDA units undergo pre-shipment inspection (PSI). If there is an issue with LMR14020SDDA, 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 LMR14020SDDA part is unused and in its original packaging.
Return procedure for LMR14020SDDA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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