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Texas Instruments LMR14050SDDA
- Part No.:
- LMR14050SDDA
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMR14050SDDA.pdf
- Description:
- IC REG BUCK ADJ 5A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:350
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Product details
Overview
LMR14050SDDA from Texas Instruments is a 40V input, 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 where low-noise, high-efficiency power conditioning from unregulated 12V/24V/36V sources is required.
For engineers reviewing the LMR14050SDDA datasheet, LMR14050SDDA pinout, LMR14050SDDA application, or LMR14050SDDA equivalent, key selection considerations include its 75ns minimum on-time for high VIN/VOUT ratios, precision enable with adjustable UVLO, RT/SYNC frequency programming and synchronization (250kHz–2.3MHz), thermal shutdown at 170°C, and HSOIC-8 PowerPAD™ package for industrial and automotive thermal reliability.
Technical Context
The LMR14050SDDA implements fixed-frequency peak current mode control with sleep-mode operation at light load to maintain >85% efficiency down to 1mA output. Its internal error amplifier drives PWM logic with slope compensation to prevent subharmonic oscillation above 50% duty cycle, while the BOOT-SW bootstrap circuit enables up to 97% effective duty cycle during dropout.
It supports dual operating modes: resistor-programmed switching frequency (200kHz–2.5MHz via RT/SYNC pin) or external clock synchronization (250kHz–2.3MHz), with PLL lock-in time under 100µs. Protection includes cycle-by-cycle current limiting (7.9A typical), output overvoltage protection (109% VREF trip), and thermal shutdown with 12°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 40V - supports direct connection to automotive batteries (12V/24V) and industrial rails without pre-regulation. |
| Output Current | 5A continuous - delivers full rated load in ambient up to +125°C with proper PCB thermal design using PowerPAD™. |
| Quiescent Current | 40µA - enables >10-year battery life in always-on automotive modules (e.g., telematics, CAN gateways). |
| Switching Frequency | Up to 2.2MHz - allows use of <10µH inductors and compact 0805/1206 ceramic capacitors for space-constrained layouts. |
| High-Side RDS(on) | 90mΩ typical - reduces conduction loss at 5A, enabling >92% efficiency at 12V→5V/3A (fSW=500kHz). |
| Feedback Reference | 0.750V ±1.2% - sets output voltage via resistor divider; enables precise 3.3V, 5V, or custom rails with <±1% regulation over line/load/temp. |
| Min. On-Time | 75ns - supports 12V→1.2V conversion at 2.2MHz (D ≈ 10%), critical for high-step-down POL applications. |
| Shutdown Current | 1µA - ensures negligible drain during vehicle ignition-off states, meeting OEM quiescent current budgets. |
Pinout & Package
LMR14050SDDA uses an 8-pin HSOIC package with exposed thermal pad (DDA), measuring 4.9mm × 6mm. The PowerPAD™ thermal pad must be soldered to a dedicated PCB ground plane for optimal thermal performance (RθJA = 43.2°C/W, RθJC(bot) = 7.8°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap supply | Connects 0.1µF X7R ceramic capacitor to SW; provides gate drive for high-side MOSFET during high-duty-cycle operation. |
| VIN | Main power input | Accepts 4V–40V; requires local high-frequency bypass (e.g., 10µF X5R + 100nF C0G) placed within 3mm of pin. |
| EN | Enable control | Logic-compatible input (1.2V threshold); internal 1µA pull-up enables floating operation; supports UVLO adjustment via resistor divider. |
| RT/SYNC | Freq. programming/sync | Configures fSW via resistor to GND (200kHz–2.5MHz) or accepts external clock (250kHz–2.3MHz) with 30ns min pulse width. |
| FB | Voltage feedback | Senses output via resistor divider; 0.75V reference enables accurate regulation; avoid routing near noise sources. |
| SS | Soft-start control | Internal 3µA current source charges external capacitor; sets monotonic VOUT ramp time (e.g., 100nF → ~25ms). |
| GND | Power & signal ground | Common return for VIN, FB, SS, EN; must connect directly to thermal pad and minimize impedance to reduce noise. |
| SW | Power switch node | Drives external inductor; high dv/dt node requiring tight layout, short trace, and guard ring to minimize EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Internal compensation | Eliminates need for external Type-II/III compensation network-reduces BOM count by ≥4 components and simplifies loop stability across all output caps. |
| Frequency synchronization | Enables deterministic EMI reduction by locking switching edges to system clock-critical for automotive EMC compliance (CISPR 25 Class 5). |
| Precision enable with UVLO hysteresis | Allows programmable system-level brown-out protection (e.g., 9V–10.5V window) using two resistors-ensures clean power sequencing in multi-rail ECUs. |
| Thermal shutdown with hysteresis | Shuts down at 170°C junction temperature and restarts at 158°C-prevents thermal runaway during overload or poor heatsinking without external monitoring. |
| Output overvoltage protection | Trips at 109% of VREF (≈0.82V) to clamp VOUT during load dump or feedback fault-protects downstream 3.3V logic from destructive overvoltage. |
| Low IQ sleep mode | Maintains regulation at microamp loads by reducing fSW dynamically-preserves battery capacity in infotainment standby and ADAS sensor wake-on-CAN modes. |
Applications
| Automotive Battery Regulation | Industrial Power Supplies |
|---|---|
Use Scenario: Powering infotainment head units from 12V vehicle battery with wide input transients (load dump up to 40V, cold crank down to 3.5V). IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 5V/3.3V rails; handles input surges via 40V absolute max rating and UVLO hysteresis. Use Value: 40µA IQ extends parking-mode runtime; 90mΩ RDS(on) minimizes heat in sealed enclosures; PowerPAD™ enables conduction cooling without heatsinks. | Use Scenario: Providing isolated 24V-to-5V/3.3V conversion for PLC I/O modules operating in 85°C factory environments. IC Role / Device Role / Timing Role: Main point-of-load regulator; operates continuously at 5A with thermal shutdown safeguarding against dust-clogged vents. Use Value: Internal compensation ensures stable regulation across -40°C to +125°C; 2.2MHz option shrinks filter size for DIN-rail mounted compact designs. |
| Telecom and Datacom Systems | Battery Powered Systems |
Use Scenario: Generating intermediate 12V rail from 48V backplane in optical line terminals with strict EMI limits. IC Role / Device Role / Timing Role: Synchronized buck converter locked to system clock to shift noise away from sensitive RF bands. Use Value: RT/SYNC pin enables deterministic spectral shaping; 75ns min on-time supports 48V→12V conversion at 1MHz for low-profile board stacking. | Use Scenario: Powering portable medical monitors with Li-ion battery (3.0–4.2V) and requirement for >5-year shelf life. IC Role / Device Role / Timing Role: Always-on system regulator; enters 1µA shutdown when host MCU asserts EN low. Use Value: Ultra-low shutdown current prevents battery depletion during storage; soft-start prevents inrush into large display capacitors. |
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 | 3A output current, identical pinout/package, same 40µA IQ and 2.2MHz capability. | Lower current rating suits cost-sensitive 3.3V/2A applications like automotive body controllers. | Select when full 5A capability is unnecessary-reduces thermal margin requirements and BOM cost. |
| TPS54560RGTT | 60V input, 5A, but 115mΩ RDS(on), 100µA IQ, no internal compensation (requires external RC network). | Better suited for 48V industrial systems; higher IQ and external compensation increase design complexity. | Choose only if >40V input range is mandatory; otherwise LMR14050SDDA offers superior efficiency and ease-of-use. |
Compared with LMR14030SDDA, the LMR14050SDDA delivers 67% higher output current in the same footprint; versus TPS54560RGTT, it achieves lower system-level component count and better light-load efficiency due to internal compensation and 40µA IQ-making it optimal for automotive and thermally constrained designs.
Availability
LMR14050SDDA is available at Aetrix Electronics and suitable for automotive battery regulation, industrial power supplies, telecom/datacom systems, and battery powered systems requiring stable component supply, long-term lifecycle support, and AEC-Q100 alignment.
Supply support for LMR14050SDDA 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-grade reliability validation.
The LMR14050SDDA belongs to TI's SIMPLE SWITCHER® power converter family-designed specifically for robust, easy-to-deploy DC-DC regulation in harsh environments including automotive, industrial, and telecom infrastructure.
FAQ
What is the maximum input voltage the LMR14050SDDA can withstand?
The LMR14050SDDA has an absolute maximum input voltage rating of 44V on the VIN pin, with recommended operation up to 40V. This allows safe operation during automotive load-dump events (SAE J1113-11 compliant) and industrial 36V rail transients. Exceeding 44V risks permanent damage per the Absolute Maximum Ratings table.
Does the LMR14050SDDA require external compensation components?
No, the LMR14050SDDA features fully internal compensation-no external Type-II or Type-III compensation network is needed. This eliminates four to six passive components, reduces layout sensitivity, and guarantees stability across common output capacitor types (ceramic, polymer, electrolytic), significantly accelerating design completion.
How does the LMR14050SDDA achieve ultra-low 40µA quiescent current?
The LMR14050SDDA achieves 40µA IQ through optimized bias circuitry and sleep-mode operation: when load current drops below ~300mA peak, it disables switching and clamps the internal error amplifier output, drawing only 40µA from VIN. This is verified across –40°C to +125°C and enables multi-year battery life in always-on automotive modules.
Can the LMR14050SDDA synchronize to an external clock, and what are the timing requirements?
Yes, the LMR14050SDDA supports synchronization via its RT/SYNC pin across 250kHz–2.3MHz. Required clock specs: high level ≥1.7V, low level ≤0.5V, minimum pulse width ≥30ns, and falling-edge triggered. An external 50Ω termination and AC coupling capacitor are recommended for low-impedance sources to ensure reliable lock-in within 100µs.
What thermal management is required for full 5A operation of the LMR14050SDDA?
For continuous 5A output at +125°C ambient, the LMR14050SDDA requires the exposed thermal pad (Pin 9) to be soldered to a ≥250mm² internal or external copper ground plane with ≥4 thermal vias (0.3mm diameter, filled). This achieves RθJA ≈ 43°C/W; without this, junction temperature exceeds 150°C, triggering thermal shutdown.
LMR14050SDDA 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:
- 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
LMR14050SDDA FAQ
1.How can I place an order for LMR14050SDDA through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR14050SDDA 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 LMR14050SDDA reliable?
The price and inventory of LMR14050SDDA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR14050SDDA is usually 5 days.
3.What payment methods are accepted for LMR14050SDDA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR14050SDDA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR14050SDDA?
LMR14050SDDA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR14050SDDA 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 LMR14050SDDA?
For technical support, including LMR14050SDDA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR14050SDDA requirements.
6.How does Aetrix verify that LMR14050SDDA is sourced from the original manufacturer or authorized distributors?
All LMR14050SDDA 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 LMR14050SDDA meets industry standards.
7.What is the process for return or replacement of LMR14050SDDA?
All LMR14050SDDA units undergo pre-shipment inspection (PSI). If there is an issue with LMR14050SDDA, 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 LMR14050SDDA part is unused and in its original packaging.
Return procedure for LMR14050SDDA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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