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Texas Instruments LMR14006XDDCT
- Part No.:
- LMR14006XDDCT
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LMR14006XDDCT.pdf
- Description:
- IC REG BUCK ADJ 600MA SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:1,099
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Product details
Overview
LMR14006XDDCT from Texas Instruments is a 40 V input, 600 mA synchronous buck DC/DC regulator in TSOT-6L package, featuring 1.1 MHz fixed switching frequency, 0.765 V feedback reference, and ultra-low 28 µA quiescent current in sleep mode-designed for battery-powered industrial and automotive power conditioning.
For engineers reviewing the LMR14006XDDCT datasheet, LMR14006XDDCT pinout, LMR14006XDDCT application, or LMR14006XDDCT equivalent, key selection criteria include its high-duty-cycle capability (96% max), integrated bootstrap diode, internal soft-start, thermal shutdown (170°C), and compatibility with ceramic output capacitors in space-constrained designs.
Technical Context
The LMR14006XDDCT implements constant-frequency peak current-mode control with internal compensation, enabling stable regulation using minimal external components. Its architecture integrates a high-side MOSFET with 600 mΩ RDS(on), boot capacitor biasing via CB/SW pins, and cycle-by-cycle overcurrent protection clamping the COMP node.
Sleep mode activates when inductor peak current falls ≤80 mA while output remains in regulation-reducing switching losses and sustaining 28 µA IQ. The device supports high duty cycles up to 96% by monitoring CB-to-SW voltage and refreshing the bootstrap capacitor during low-side conduction, even under light-load dropout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 40 V - supports wide-input industrial and automotive rails without pre-regulation. |
| Output Current | Up to 600 mA - sufficient for powering microcontrollers, sensors, and interface ICs in compact systems. |
| Switching Frequency | 1.1 MHz (X version) - enables use of small 3.3–10 µH inductors and 10 µF ceramic output capacitors. |
| Feedback Reference | 0.765 V ±1.5% - sets precise output voltage via resistor divider (e.g., 5 V with R1=54.9 kΩ, R2=10 kΩ). |
| Quiescent Current | 28 µA in sleep mode - extends battery runtime in always-on or low-duty-cycle portable equipment. |
| Shutdown Current | 1 µA - minimizes leakage during system standby or deep-sleep states. |
| Thermal Shutdown | 170°C trip, 160°C hysteresis - protects against sustained overload or poor PCB thermal design. |
Pinout & Package
LMR14006XDDCT is housed in a thermally enhanced TSOT-6L package (2.9 mm × 1.6 mm, 0.95 mm height) with exposed pad for improved heat dissipation and 102°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB (Pin 1) | Bootstrap bias supply | Connects external 100 nF ceramic capacitor to SW; supplies gate drive voltage for internal high-side MOSFET. |
| GND (Pin 2) | Power ground | Main return path for input, output, and internal circuitry; must be low-impedance connection to PCB ground plane. |
| FB (Pin 3) | Feedback input | Monitors output voltage via resistor divider; regulates VOUT = 0.765 V × (1 + R1/R2); high-impedance input (≤100 nA bias current). |
| /SHDN (Pin 4) | Enable/disable control | High-voltage tolerant (0–40 V); internal pull-up; logic-high ≥1.25 V enables operation; pulled low disables regulator into 1 µA shutdown. |
| VIN (Pin 5) | Main power input | Supplies internal bias and high-side MOSFET drain; accepts 4–40 V; requires local 2.2 µF/50 V ceramic input capacitor. |
| SW (Pin 6) | Switch node | Connects to inductor, Schottky diode cathode, and CB capacitor; carries high dv/dt switching waveform; critical for EMI layout. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boot recharge diode | Eliminates external bootstrap diode, reducing BOM count and board area in TSOT-6L footprint. |
| Internal soft-start | Prevents inrush current at startup by gradually ramping COMP node voltage; avoids output overshoot and input rail sag. |
| Overvoltage transient protection (OVTP) | Disables high-side switch if FB exceeds 108% of 0.765 V (≈0.826 V), limiting output overshoot during load unload transients. |
| Pulse-by-pulse current limit | Clamps COMP node to limit peak switch current at 1200 mA, protecting MOSFET during short-circuit or overload. |
| UVLO with adjustable threshold | Fixed 4 V rising / 3 V falling UVLO on VIN; /SHDN pin can be used with resistor divider to set custom input undervoltage lockout. |
Applications
| Industrial Distributed Power | Automotive Body Control |
|---|---|
|
Use Scenario: Powering PLC I/O modules, sensor transmitters, and fieldbus interfaces from 24 V DC rails with variable load profiles. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 3.3 V or 5 V to MCU, CAN transceivers, and analog front-ends. Use Value: 40 V max input withstands load-dump transients; 28 µA sleep current enables always-on monitoring without draining backup batteries. |
Use Scenario: Supplying infotainment subsystems, door modules, and lighting controllers in 12 V vehicle architectures. IC Role / Device Role / Timing Role: Point-of-load converter stepping down battery voltage to 5 V for USB peripherals and microcontrollers. Use Value: 1.1 MHz switching avoids AM radio band interference; TSOT-6L package fits tight fuse-box or junction-box layouts. |
| Battery-Powered Test Equipment | Portable Medical Monitors |
|
Use Scenario: Power management in handheld multimeters, oscilloscope probes, and calibration tools operating from Li-ion or AA cells. IC Role / Device Role / Timing Role: Main DC/DC regulator maintaining stable 3.3 V rail across battery discharge (4–40 V input range). Use Value: 1 µA shutdown current preserves shelf life; internal compensation eliminates tuning effort for rapid prototyping. |
Use Scenario: Providing clean, low-noise power to ADCs, op-amps, and wireless radios in wearable ECG or SpO₂ devices. IC Role / Device Role / Timing Role: Efficient step-down converter generating 3.3 V from single-cell LiPo (3.0–4.2 V) or dual-cell alkaline (3–6 V) sources. Use Value: Sleep mode reduces average current draw below 30 µA at light loads, extending clinical-grade battery runtime beyond 72 hours. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR14006YDDCT | 2.1 MHz switching frequency vs. 1.1 MHz; identical pinout, package, and electrical specs except fSW and DMAX (97%). | Better suited for ultra-compact designs requiring smallest possible inductors/capacitors; higher EMI filtering demand. | Select Y version when board space is constrained and 2.1 MHz noise can be managed; X version preferred for lower EMI sensitivity. |
| MP2451DT-LF-Z | 36 V max input, 0.6 A, 2 MHz, but lacks sleep mode (IQ = 120 µA) and adjustable UVLO; uses different pinout (SOT-23-6). | Lower cost alternative where ultra-low quiescent current is not required; no direct PCB replacement due to pin mismatch. | Consider only for non-battery applications; requires layout revision and revalidation of compensation network. |
Compared with LMR14006YDDCT, the LMR14006XDDCT trades higher-frequency efficiency for lower EMI and relaxed component stress; versus MP2451DT-LF-Z, it delivers superior battery longevity and design flexibility via sleep mode and high-voltage enable, despite higher unit cost.
Availability
LMR14006XDDCT is available at Aetrix Electronics and suitable for industrial distributed power systems, automotive body electronics, and battery-powered test equipment requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for LMR14006XDDCT 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 expertise in high-reliability DC/DC conversion.
The LMR14006XDDCT belongs to TI's SIMPLE SWITCHER® family-engineered specifically for ease-of-use, minimal external component count, and robust operation in harsh industrial and automotive environments.
FAQ
What is the maximum duty cycle supported by the LMR14006XDDCT?
The LMR14006XDDCT supports a maximum duty cycle of 96%, enabled by its bootstrap UVLO circuit and internal refresh FET. This allows operation down to VOUT ≈ VIN × 0.96, making it suitable for high-input-to-output-ratio applications like 24 V to 22 V pre-regulation. Duty cycle is limited by CB-to-SW voltage monitoring-not by oscillator timing.
Does the LMR14006XDDCT require an external bootstrap diode?
No, the LMR14006XDDCT integrates the bootstrap recharge diode internally. Only a 100 nF ceramic capacitor between CB and SW pins is required to sustain gate drive for the high-side MOSFET. This eliminates one external component, reduces solution size, and improves reliability compared to discrete bootstrap implementations.
How does sleep mode activate and deactivate in the LMR14006XDDCT?
Sleep mode activates automatically when the inductor's peak current falls ≤80 mA and the output voltage remains within regulation. It deactivates when load increases enough to cause peak current to exceed the threshold for two consecutive cycles. The LMR14006XDDCT draws just 28 µA in this state-critical for battery longevity in intermittent-use devices.
Can the LMR14006XDDCT be used with ceramic output capacitors only?
Yes, the LMR14006XDDCT is fully compatible with ceramic output capacitors-including low-ESR types-as confirmed by TI's application circuits and stability analysis. Its internal compensation and current-mode control ensure phase margin >45° with 10 µF X5R/X7R ceramics, eliminating need for tantalum or aluminum electrolytics in most designs.
What is the purpose of the /SHDN pin's high-voltage tolerance on the LMR14006XDDCT?
With 0–40 V absolute maximum rating and internal pull-up, the /SHDN pin allows direct interfacing to higher-voltage system rails (e.g., 24 V PLC backplane or automotive battery) without level-shifting. Pulling it below 1.2 V disables the regulator into 1 µA shutdown-enabling centralized power sequencing in multi-rail systems using simple resistive dividers or open-drain drivers.
LMR14006XDDCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- 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):
- 0.765V
- Voltage - Output (Max):
- 38.4V
- Current - Output:
- 600mA
- Frequency - Switching:
- 1.1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
LMR14006XDDCT FAQ
1.How can I place an order for LMR14006XDDCT through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR14006XDDCT 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 LMR14006XDDCT reliable?
The price and inventory of LMR14006XDDCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR14006XDDCT is usually 5 days.
3.What payment methods are accepted for LMR14006XDDCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR14006XDDCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR14006XDDCT?
LMR14006XDDCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR14006XDDCT 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 LMR14006XDDCT?
For technical support, including LMR14006XDDCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR14006XDDCT requirements.
6.How does Aetrix verify that LMR14006XDDCT is sourced from the original manufacturer or authorized distributors?
All LMR14006XDDCT 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 LMR14006XDDCT meets industry standards.
7.What is the process for return or replacement of LMR14006XDDCT?
All LMR14006XDDCT units undergo pre-shipment inspection (PSI). If there is an issue with LMR14006XDDCT, 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 LMR14006XDDCT part is unused and in its original packaging.
Return procedure for LMR14006XDDCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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