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Texas Instruments LMR14030SDDA
- Part No.:
- LMR14030SDDA
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMR14030SDDA.pdf
- Description:
- IC REG BUCK ADJ 3.5A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:3,793
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Product details
Overview
LMR14030SDDA from Texas Instruments is a 40V input, 3.5A 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 low-noise operation are critical.
For engineers reviewing the LMR14030SDDA datasheet, LMR14030SDDA pinout, LMR14030SDDA application, or LMR14030SDDA equivalent, key selection criteria include input voltage range (4–40V), light-load efficiency in sleep mode, RT/SYNC frequency programmability (200kHz–2.5MHz), precision enable threshold (1.2V), and thermal shutdown at 170°C.
Technical Context
The LMR14030SDDA implements fixed-frequency peak current mode control with slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its internal error amplifier drives PWM logic with clamped COMP voltage during sleep mode, enabling ultra-low 40µA IQ while maintaining regulation via periodic burst-mode recovery.
It supports dual operating modes: resistor-programmed timing (RT pin) from 200kHz to 2.5MHz, and external clock synchronization (250kHz–2.3MHz) with PLL lock-in time of 100µs. The BOOT-to-SW bootstrap circuit enables up to 97% effective duty cycle, with automatic low-side switch activation to recharge BOOT when voltage drops below 3.2V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 40V - supports direct connection to automotive batteries (12V/24V/36V systems) and industrial unregulated rails without pre-regulation. |
| Output Current | 3.5A continuous - delivers full rated load with thermal derating per RθJA = 43.2°C/W in HSOIC-8 package. |
| Quiescent Current | 40µA - enables >1-year battery life in always-on monitoring systems with VIN ≥ 4V. |
| Switching Frequency | 2.2MHz - allows use of <1µH inductors and 10µF ceramic output capacitors for space-constrained PCB layouts. |
| High-Side RDS(on) | 90mΩ typical - reduces conduction loss at 3.5A to <1.1W, supporting >90% efficiency at 12V→5V/2A. |
| Feedback Reference | 0.750V ±1.2% - sets output voltage via resistor divider; enables precise 3.3V, 5V, or custom outputs with <1% total error. |
| Min On-Time | 75ns - supports high VIN-to-VOUT ratios (e.g., 36V→3.3V) without pulse-skipping at 2.2MHz. |
| Shutdown Current | 1µA - ensures negligible battery drain during system standby or deep-sleep states. |
Pinout & Package
LMR14030SDDA uses an 8-pin HSOIC package (DDA) with exposed thermal pad (4.9mm × 6mm), optimized for high-power density and thermal dissipation in industrial and automotive environments.
| 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; requires local high-frequency bypass capacitor (e.g., 10µF ceramic + 100nF) placed within 3mm of pin. |
| EN | Enable control | Precision 1.2V threshold with 3.6µA hysteresis current; supports adjustable UVLO using external resistor divider. |
| RT/SYNC | Frequency control | Configurable as resistor-set oscillator (200kHz–2.5MHz) or high-impedance sync input (250kHz–2.3MHz) with 30ns minimum pulse width. |
| FB | Voltage feedback | Senses output via resistor divider; internal 0.75V reference enables accurate VOUT setting with minimal FB current error. |
| SS | Soft-start ramp | 3µA internal current charges external CSS capacitor; controls output voltage rise time to limit inrush current. |
| GND | Power ground | System return path; must be connected to PCB ground plane with low-inductance layout. |
| SW | Power switch node | Drives external inductor; connects internally to high-side MOSFET drain; requires tight loop with BOOT and GND. |
| Thermal Pad | Heat dissipation | Exposed copper pad on bottom; must be soldered to solid ground plane for RθJC(bot) = 7.8°C/W thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Compensation | Eliminates need for external Type-II/III compensation network - reduces BOM count and design iteration time by >70%. |
| Sleep Mode Operation | Drops switching activity at light loads while maintaining regulation via controlled burst-mode recovery - sustains >85% efficiency down to 1mA output. |
| Frequency Synchronization | Enables noise-sensitive systems (e.g., ADCs, RF receivers) to avoid beat frequencies by locking to master clock - supports jitter-free multi-rail power sequencing. |
| Overvoltage Protection | Triggers immediate high-side FET shutdown at 109% VREF (≈0.82V) - limits output overshoot to <2% during load dump or fast unload transients. |
| Thermal Shutdown | Activates at 170°C junction temperature with 12°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
| Adjustable UVLO | EN pin hysteresis current enables user-defined input undervoltage lockout thresholds - supports battery voltage monitoring and graceful system shutdown. |
Applications
| Automotive Battery Regulation | Industrial Power Supplies |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery to stable 5V/3.3V for infotainment ECUs and ADAS sensors under cold-crank (4.5V) and load-dump (40V) conditions. IC Role / Device Role / Timing Role: Primary buck regulator with wide VIN range, low IQ sleep mode, and robust protection against transients. Use Value: Maintains system uptime during engine start-stop cycles and eliminates need for external TVS or pre-regulator stages. | Use Scenario: Providing isolated 12V/15V rails for PLC I/O modules and motor controllers in factory automation equipment powered from 24V/48V DC bus. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with programmable frequency to avoid EMI interference with communication buses (CAN, RS-485). Use Value: Enables compact 1" × 1" power stage with <15°C temperature rise at full load, reducing thermal management complexity. |
| Telecom and Datacom Systems | Battery Powered Systems |
Use Scenario: Generating intermediate 5V rail from 48V backplane in optical line terminals and base station radios with strict EMI requirements. IC Role / Device Role / Timing Role: Synchronized buck converter operating at 2.2MHz to shift switching noise above sensitive RF bands. Use Value: Achieves >92% efficiency at 2A while meeting CISPR-32 Class B conducted emissions without shielding. | Use Scenario: Powering portable medical monitors and handheld test equipment from single-cell Li-ion (3.0–4.2V) or two-cell packs (6–8.4V) with long shelf life. IC Role / Device Role / Timing Role: Ultra-low-IQ buck converter with 1µA shutdown and precision enable for system-level power gating. Use Value: Extends battery runtime by >30% versus comparable 100µA-Q devices and enables reliable wake-up from 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 |
|---|---|---|---|
| LMR14020SDDA | 2A output current, identical pinout and feature set - shares same HSOIC-8 package and 4–40V input range. | Lower current rating suits sensor nodes and low-power microcontrollers where 3.5A headroom is unnecessary. | Select when thermal budget or cost sensitivity outweighs need for 3.5A margin; no PCB changes required. |
| LMR14050SDDA | 5A output current, same package footprint and control architecture - differs only in RDS(on) (65mΩ vs 90mΩ) and current limit (7.5A vs 5.5A). | Required for higher-power FPGA or DSP cores needing >3.5A at 1.2V/1.8V with tighter voltage tolerance. | Choose for future-proofing or higher-current derivatives; pin-compatible but requires validation of thermal layout at 5A. |
Compared with LMR14020SDDA and LMR14050SDDA, the LMR14030SDDA offers optimal balance of current capability, thermal performance, and board area - delivering 3.5A with 43.2°C/W junction-to-ambient resistance in the same 4.9mm × 6mm HSOIC package used across the family.
Availability
LMR14030SDDA 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 traceable sourcing.
Supply support for LMR14030SDDA 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 and embedded processing technologies, with over 50 years of power management innovation and broad automotive qualification expertise.
The LMR14030SDDA belongs to TI's SIMPLE SWITCHER® DC-DC converter product line - engineered specifically for rugged, easy-to-use buck regulation in harsh environments where reliability, wide input range, and low quiescent current are mandatory.
FAQ
What is the maximum input voltage rating for the LMR14030SDDA?
The LMR14030SDDA has an absolute maximum input voltage rating of 44V on the VIN pin, with recommended operating range from 4V to 40V. This allows safe operation across automotive battery transients including ISO 7637-2 Pulse 5a (load dump up to 40V) and cold-crank conditions down to 4.5V. Exceeding 44V may cause permanent damage per datasheet Section 5.1.
Does the LMR14030SDDA require external compensation components?
No, the LMR14030SDDA 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 capacitors (including low-ESR ceramics), as confirmed in Section 6.3.1 and Figure 6-2 of the official datasheet.
How does the LMR14030SDDA achieve ultra-low quiescent current?
The LMR14030SDDA achieves 40µA typical quiescent current through dedicated sleep-mode circuitry that disables switching activity while maintaining regulation via periodic burst-mode recovery. In shutdown, it draws only 1µA - verified in Section 5.5 Electrical Characteristics under ISHDN test condition with VEN = 0V and TA = 25°C.
Can the LMR14030SDDA synchronize to an external clock, and what are the valid frequency ranges?
Yes, the LMR14030SDDA supports external clock synchronization on the RT/SYNC pin across 250kHz to 2.3MHz, with defined thresholds (VSYNC_HI ≥ 1.7V, VSYNC_LO ≤ 0.5V) and minimum pulse width (30ns). This is documented in Section 5.6 Switching Characteristics and Figure 6-5 of the datasheet, enabling EMI-sensitive multi-rail systems to eliminate beat frequencies.
What thermal protection mechanisms are built into the LMR14030SDDA?
The LMR14030SDDA integrates thermal shutdown at 170°C junction temperature with 12°C hysteresis, cycle-by-cycle current limiting, output overvoltage protection (OVP), and input undervoltage lockout (UVLO). These protections are detailed in Sections 6.3.9–6.3.11 and Table 5-5, ensuring robust operation under overload, short-circuit, or poor heatsinking conditions.
Is the LMR14030SDDA pin-compatible with other members of the LMR140xx family?
Yes, the LMR14030SDDA shares identical HSOIC-8 (DDA) pinout and footprint with LMR14020SDDA and LMR14050SDDA - enabling drop-in replacement across 2A, 3.5A, and 5A variants. This compatibility is explicitly stated in Section 6.1 Overview and confirmed in Package Drawing SLVSAG9B.
LMR14030SDDA 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:
- 3.5A
- 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
LMR14030SDDA FAQ
1.How can I place an order for LMR14030SDDA through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR14030SDDA 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 LMR14030SDDA reliable?
The price and inventory of LMR14030SDDA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR14030SDDA is usually 5 days.
3.What payment methods are accepted for LMR14030SDDA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR14030SDDA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR14030SDDA?
LMR14030SDDA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR14030SDDA 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 LMR14030SDDA?
For technical support, including LMR14030SDDA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR14030SDDA requirements.
6.How does Aetrix verify that LMR14030SDDA is sourced from the original manufacturer or authorized distributors?
All LMR14030SDDA 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 LMR14030SDDA meets industry standards.
7.What is the process for return or replacement of LMR14030SDDA?
All LMR14030SDDA units undergo pre-shipment inspection (PSI). If there is an issue with LMR14030SDDA, 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 LMR14030SDDA part is unused and in its original packaging.
Return procedure for LMR14030SDDA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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