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Texas Instruments LMR12007YMK
- Part No.:
- LMR12007YMK
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LMR12007YMK.pdf
- Description:
- IC REG BUCK ADJ 750MA SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:544
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Product details
Overview
LMR12007YMK from Texas Instruments is a monolithic, current-mode PWM step-down DC-DC regulator in a 6-pin Thin SOT-23 package. It delivers up to 750mA output current with 550kHz fixed switching frequency, 3.0V–18V input range, and 1.25V–16V adjustable output voltage. It integrates a 350mΩ NMOS switch and internal soft-start for local point-of-load regulation in space-constrained USB-powered devices.
For engineers reviewing the LMR12007YMK datasheet, LMR12007YMK pinout, LMR12007YMK application, or LMR12007YMK equivalent, key selection criteria include its 550kHz switching frequency (Y variant), 30nA shutdown current, 1.25V ±2% internal reference, thermal shutdown protection, and compatibility with ceramic output capacitors for low-ripple, high-transient-response power delivery.
Technical Context
The LMR12007YMK employs current-mode PWM control with internal compensation and a fixed 550kHz oscillator, enabling stable regulation across 3V–18V input without external loop compensation. Its bootstrap gate-drive architecture (BOOST–SW ≥ 1.6V) supports efficient NMOS switching with on-time as low as 13ns, allowing operation down to 1.25V output.
It features cycle-by-cycle current limiting (1.5A typical), undervoltage lockout (2.74V rising threshold), output overvoltage protection (10% above VREF), and thermal shutdown at 165°C junction temperature-ensuring robust operation in battery-powered and embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 18V - supports wide-input industrial and automotive supply rails without pre-regulation. |
| Output Current | 750mA - sufficient for core logic, microcontrollers, and interface ICs in portable electronics. |
| Switching Frequency | 550kHz - enables use of compact 4.7µH inductors and small ceramic capacitors (e.g., 10µF X5R). |
| Feedback Reference | 1.25V ±2% - sets precise output voltage via external resistor divider (R1/R2); enables 1.25V–16V adjustment. |
| Shutdown Current | 30nA - minimizes battery drain in always-on or sleep-mode applications like set-top boxes and DSL modems. |
| Internal NMOS RDS(ON) | 350mΩ - reduces conduction loss and improves efficiency at mid-load (e.g., >85% at 500mA, 5V→3.3V). |
| Soft-Start Time | ~200µs - controls output ramp rate to limit inrush current into downstream capacitance. |
Pinout & Package
LMR12007YMK is housed in a 6-pin Thin SOT-23 package (Package Number DDC, R-PDSO-G6), measuring 2.9mm × 1.6mm × 0.9mm with gull-wing leads and Pin 1 marked by indentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST | Bootstrap voltage supply | Drives NMOS gate; requires 0.01µF ceramic capacitor between BOOST and SW to sustain ≥2.5V gate overdrive during high-duty cycles. |
| GND | Signal and power ground | Reference for FB divider and internal circuits; feedback resistor bottom must connect directly here to minimize regulation error. |
| FB | Voltage feedback input | High-impedance node (250nA bias) sensing resistor divider output; trace must be short and noise-isolated. |
| EN | Enable control input | Logic-high (>1.8V) enables regulation; floating or >VIN+0.3V risks damage; 30nA shutdown current achieved when pulled low. |
| VIN | Main input supply | Accepts 3V–18V; requires local 10µF X5R ceramic bypass capacitor placed adjacent to pin with low-ESL layout. |
| SW | Power switch node | Connects to inductor, catch diode cathode, and BOOST capacitor; high dv/dt node requiring tight loop area and ground plane clearance. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode PWM control | Enables fast transient response and inherent cycle-by-cycle current limiting without external sense resistors. |
| Internal soft-start | Ramps internal 1.25V reference over ~200µs to prevent output overshoot and reduce stress on input capacitors. |
| Thermal shutdown | Disables switching at 165°C junction temperature and resumes only after cooling to ~150°C-prevents permanent damage under overload or poor heatsinking. |
| Output overvoltage protection | Shuts off NMOS switch if FB voltage exceeds 1.375V (10% above 1.25V reference), protecting downstream loads from fault conditions. |
| WEBENCH® integration | Supports online design, BOM generation, and performance simulation directly from TI's design tool-reducing development time for custom buck designs. |
Applications
| USB Powered Devices | Battery Powered Devices |
|---|---|
Use Scenario: Powering USB-peripheral ICs (e.g., USB-to-UART bridges, HID controllers) from 5V bus with tight board area constraints. IC Role / Device Role / Timing Role: Primary DC-DC converter providing regulated 3.3V or 1.8V rail with minimal external components. Use Value: 30nA shutdown current extends battery life in intermittently active peripherals; 550kHz switching allows <3mm² total solution size. | Use Scenario: Supplying microcontroller cores and sensors in handheld medical monitors or wireless sensors operating from single-cell Li-ion or alkaline batteries. IC Role / Device Role / Timing Role: Efficient step-down regulator maintaining stable output across 3.0V–18V input swing (e.g., 4.2V fresh to 2.8V depleted + boost-derived rail). Use Value: 750mA capability supports burst-mode processing; 1.25V reference accuracy ensures consistent ADC reference and sensor biasing. |
| Set-Top Boxes | Notebook Computers |
Use Scenario: Generating auxiliary 1.2V or 1.5V rails for HDMI PHYs or memory interfaces in low-power STB platforms. IC Role / Device Role / Timing Role: Local point-of-load regulator minimizing voltage drop and noise coupling from main 12V or 5V system rail. Use Value: Internal compensation eliminates need for external compensation network; 550kHz frequency avoids AM radio band interference. | Use Scenario: Powering USB-C port controller, EC (Embedded Controller), or touchpad ASIC in ultrabook sub-systems where thermal headroom is limited. IC Role / Device Role / Timing Role: Secondary buck regulator delivering tightly regulated low-noise supply independent of main CPU VRM. Use Value: Thermal shutdown and current limiting protect against short-circuit faults on densely packed daughterboards; Thin SOT-23 footprint saves critical PCB real estate. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR12007XMK | 1.6MHz switching frequency, higher quiescent current (3.3mA vs 2.5mA), same package and pinout. | Better suited for ultra-compact designs needing smaller inductors (e.g., 4.7µH vs 10µH), but lower light-load efficiency due to higher switching loss. | Select LMR12007XMK when board area is more constrained than efficiency; verify thermal performance at full load due to higher fSW-related losses. |
| TPS62231DRVR | 3MHz switching, 600mA output, 2.05V–6.5V input, different pinout (5-pin SOT-23), no BOOST pin. | Designed for low-voltage, high-frequency applications (e.g., 3.3V→1.2V); lacks bootstrap architecture-requires external diode or synchronous rectification. | Choose TPS62231DRVR only for sub-6.5V input systems where 3MHz enables smallest passive size; not drop-in compatible due to pin count, function, and topology differences. |
Compared with LMR12007YMK, the LMR12007XMK offers higher frequency for smaller magnetics but trades off light-load efficiency and thermal margin, while the TPS62231DRVR targets lower-input, higher-frequency niches with fundamentally different architecture and no pin compatibility.
Availability
LMR12007YMK is available at Aetrix Electronics and suitable for USB powered devices, battery powered devices, and set-top boxes requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LMR12007YMK 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 company specializing in analog, embedded processing, and power management technologies, with leadership in high-efficiency DC-DC conversion and design ecosystem tools.
The LMR12007YMK belongs to TI's LMR series of monolithic buck regulators, designed specifically for space-constrained, high-efficiency point-of-load applications in consumer, computing, and industrial electronics where minimal external components and robust protection features are essential.
FAQ
What is the switching frequency of the LMR12007YMK?
The LMR12007YMK operates at a fixed 550kHz switching frequency, as designated by the "Y" suffix in its part number. This frequency is internally set and unadjustable, enabling consistent use of small surface-mount inductors (e.g., 10µH) and ceramic capacitors while balancing efficiency and EMI performance across its 3V–18V input range. The LMR12007YMK does not support external frequency synchronization or adjustment.
Does the LMR12007YMK require an external catch diode?
Yes, the LMR12007YMK requires an external Schottky catch diode (e.g., MBRM110L) connected between the SW pin and output rail. As a non-synchronous buck converter, it relies on this diode to provide a current path during the NMOS switch off-time. The diode must support ≥750mA average current and withstand VIN(max) reverse voltage; low forward voltage (≤0.4V) is critical to maintain high efficiency, especially at high duty cycles.
How is the output voltage set on the LMR12007YMK?
The output voltage of the LMR12007YMK is set using a resistor divider connected to the FB pin: VOUT = 1.25V × (1 + R1/R2). With R2 = 10kΩ (recommended), R1 is calculated as R1 = (VOUT − 1.25V) × 8kΩ. For example, for 3.3V output, R1 ≈ 16.4kΩ. The FB pin draws only 250nA bias current, so standard 1% tolerance resistors yield accurate regulation without trimming. Layout best practice places R2's ground connection directly at the GND pin.
What is the purpose of the BOOST pin on the LMR12007YMK?
The BOOST pin on the LMR12007YMK supplies gate drive voltage to the internal NMOS switch via a bootstrap capacitor (0.01µF ceramic) connected between BOOST and SW. During the switch off-time, VIN charges the capacitor through an internal diode; during on-time, BOOST rises to ~2×VIN, ensuring sufficient gate overdrive (≥2.5V above SW) for low RDS(ON) operation. Incorrect BOOST routing or undersized capacitor causes premature switch turn-off and regulation failure.
Can the LMR12007YMK operate with a 2.5V input supply?
No, the LMR12007YMK cannot reliably operate with a 2.5V input supply. Its undervoltage lockout (UVLO) rising threshold is 2.74V (typical), and minimum recommended input is 3.0V per datasheet operating ratings. At 2.5V, the device remains disabled or exhibits unstable startup behavior. For sub-3V inputs, consider alternative regulators such as the TPS6223x series or TI's LMR36015, which specify 2.7V minimum input.
LMR12007YMK 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):
- 3V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 16V
- Current - Output:
- 750mA
- Frequency - Switching:
- 550kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
LMR12007YMK FAQ
1.How can I place an order for LMR12007YMK through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR12007YMK 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 LMR12007YMK reliable?
The price and inventory of LMR12007YMK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR12007YMK is usually 5 days.
3.What payment methods are accepted for LMR12007YMK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR12007YMK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR12007YMK?
LMR12007YMK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR12007YMK 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 LMR12007YMK?
For technical support, including LMR12007YMK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR12007YMK requirements.
6.How does Aetrix verify that LMR12007YMK is sourced from the original manufacturer or authorized distributors?
All LMR12007YMK 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 LMR12007YMK meets industry standards.
7.What is the process for return or replacement of LMR12007YMK?
All LMR12007YMK units undergo pre-shipment inspection (PSI). If there is an issue with LMR12007YMK, 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 LMR12007YMK part is unused and in its original packaging.
Return procedure for LMR12007YMK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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