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Texas Instruments LMR12007YMKX
- Part No.:
- LMR12007YMKX
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LMR12007YMKX.pdf
- Description:
- IC REG BUCK ADJ 750MA SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,122
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Product details
Overview
LMR12007YMKX 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 using external resistive feedback. It integrates a 350mΩ NMOS power switch and supports local point-of-load regulation in space-constrained battery-powered devices.
For engineers reviewing the LMR12007YMKX datasheet, LMR12007YMKX pinout, LMR12007YMKX application, or LMR12007YMKX equivalent, key selection criteria include its 550kHz switching frequency (Y variant), 30nA shutdown current, internal 1.25V ±2% reference, thermal shutdown protection, and bootstrap-based gate drive architecture requiring external BOOST capacitor and catch diode.
Technical Context
The LMR12007YMKX employs current-mode PWM control with internal compensation and fixed 550kHz oscillator frequency. Its control loop uses an error amplifier comparing FB voltage against a 1.25V internal reference, combined with pulse-by-pulse current limiting and corrective ramp modulation for stability across load and line variations.
It features integrated soft-start (200µs reference ramp), undervoltage lockout (2.74V rising threshold, 440mV hysteresis), output overvoltage protection (10% above VREF), and thermal shutdown activation at 165°C junction temperature. The BOOST pin supplies gate drive via external bootstrap capacitor, requiring VBOOST–VSW between 1.6V and 5.5V for proper NMOS switch operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 550kHz - Enables use of compact 4.7µH inductors and ceramic capacitors; reduces solution footprint vs lower-frequency regulators. |
| Input Voltage Range | 3.0V to 18V - Supports wide-input applications including 5V/12V rails and battery systems with variable discharge profiles. |
| Output Voltage Range | 1.25V to 16V - Adjustable via external resistor divider on FB pin; minimum 1.25V set by internal 1.25V ±2% reference. |
| Max Output Current | 750mA - Delivered continuously under thermal limits; peak switch current limit is 1.0A min (1.5A typ). |
| Quiescent Current | 2.5mA (active), 30nA (shutdown) - Enables ultra-low-power standby in portable and USB-powered devices. |
| Internal Switch RDS(ON) | 350mΩ (typ) - Reduces conduction loss at 750mA load; contributes to >90% efficiency at mid-load with optimized layout. |
| Feedback Reference | 1.25V ±2% - High-accuracy reference enables tight output regulation; FB bias current ≤250nA minimizes divider error. |
Pinout & Package
LMR12007YMKX is housed in a 6-pin Thin SOT-23 package (TI package code DDC), measuring 2.9mm × 1.6mm × 0.9mm with gull-wing leads. Thermal resistance θJA is 118°C/W on a 4-layer 3″×3″ PCB with 2oz copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BOOST | Bootstrap supply node | Drives NMOS gate during high-side conduction; requires external 0.01µF ceramic capacitor to SW to maintain ≥1.6V gate overdrive. |
| 2 - GND | Signal and power ground | Reference for FB divider and internal circuits; bottom resistor of feedback network must connect here for accurate regulation. |
| 3 - FB | Feedback input | High-impedance node (≤250nA bias) sensing output voltage via resistor divider; trace must be short and noise-isolated. |
| 4 - EN | Enable control input | Logic-high (>1.8V) enables regulation; logic-low (<0.4V) disables IC with 30nA shutdown current; must not float or exceed VIN + 0.3V. |
| 5 - VIN | Main input supply | Accepts 3V–18V; requires local 10µF ceramic bypass capacitor placed near pin to suppress switching transients. |
| 6 - SW | Power switch output | Connects to inductor, catch diode cathode, and BOOST capacitor; carries high di/dt; must be routed short and wide. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 550kHz switching | Enables consistent EMI profile and predictable filter design; supports small 4.7µH inductors without compromising transient response. |
| Internal soft-start | 200µs reference ramp limits inrush current during startup, preventing input rail sag and output overshoot in sensitive systems. |
| Current-mode PWM control | Provides inherent cycle-by-cycle current limiting, fast load-transient response, and simplified loop compensation without external components. |
| Thermal shutdown & OVP | Protects against sustained overload or fault conditions: shuts down at 165°C junction temp and disables switch if FB exceeds 1.375V (10% over VREF). |
| Ultra-low shutdown current | 30nA quiescent draw in disable state meets stringent battery-life requirements for always-on IoT sensors and wearables. |
Applications
| USB-Powered Devices | Battery-Powered Portable Electronics |
|---|---|
Use Scenario: Powering microcontrollers, sensors, and USB peripherals from 5V USB source with tight board area constraints. IC Role / Device Role / Timing Role: Primary step-down regulator converting 5V USB input to 3.3V or 1.8V core voltage with minimal external components. Use Value: 550kHz switching allows 4.7µH inductor and 10µF ceramic output cap, reducing total solution size to <100 mm² while maintaining >88% efficiency at 500mA. |
Use Scenario: Core power supply for handheld medical monitors or wireless sensor nodes operating from single-cell Li-ion (3.0–4.2V) or dual-cell alkaline (2.4–3.6V). IC Role / Device Role / Timing Role: Efficient buck converter delivering stable 1.25V–3.3V output across full battery discharge curve with low quiescent current. Use Value: 30nA shutdown current extends shelf life; 3.0V minimum input enables operation down to end-of-discharge; internal compensation eliminates tuning effort. |
| Notebook Subsystem Regulation | Digital Set-Top Box Power Rails |
Use Scenario: Local point-of-load regulation for display interface ICs or audio codecs requiring clean, low-noise 1.2V or 1.5V supply. IC Role / Device Role / Timing Role: Secondary regulator deriving precise low-voltage rail from main 5V or 12V system bus. Use Value: 1.25V ±2% internal reference and low FB bias current ensure ±1% output accuracy; soft-start prevents brownout during hot-plug events. |
Use Scenario: Powering digital demodulator, MPEG decoder, or HDMI transmitter ICs in consumer STB designs with 12V input. IC Role / Device Role / Timing Role: Compact, cost-effective 3.3V/750mA supply replacing larger discrete solutions or higher-pin-count controllers. Use Value: Thin SOT-23 package fits dense layouts; 1.6MHz alternative (LMR12007X) available for even smaller magnetics when needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR12007XMKX | 1.6MHz switching frequency, same package and pinout; higher FSW enables smaller inductors but increases switching loss at high VIN. | Better suited for ultra-compact designs where 12V→3.3V conversion must fit within <60 mm² PCB area. | Select LMR12007XMKX when board space is more critical than efficiency at light loads; verify thermal performance at full 750mA with 1.6MHz operation. |
| TPS62231DRVR | 3MHz FSW, 600mA max output, 2.05V–6.5V input range; includes power-good flag and different enable threshold (0.95V). | Targeted at low-input, high-FSW applications like single-cell Li-ion systems; lacks BOOST pin architecture. | Choose TPS62231DRVR only for 2.05V–6.5V input systems needing PG signal; not drop-in compatible due to different pin functions and input range limitations. |
Compared with LMR12007YMKX, the LMR12007XMKX offers higher frequency for smaller passives but trades off light-load efficiency, while the TPS62231DRVR supports lower input voltages and adds power-good signaling but cannot replace LMR12007YMKX in 12V or wide-input applications.
Availability
LMR12007YMKX is available at Aetrix Electronics and suitable for USB-powered devices, battery-powered portable electronics, notebook subsystem regulation, and digital set-top box power rails requiring stable component supply, long-term lifecycle support, and consistent parametric performance.
Supply support for LMR12007YMKX 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-efficiency DC-DC conversion.
The LMR12007YMKX belongs to TI's LMR series of monolithic buck regulators designed for space-constrained, high-density point-of-load applications demanding low quiescent current, fast transient response, and minimal external component count.
FAQ
What is the switching frequency of the LMR12007YMKX?
The LMR12007YMKX 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 EMI behavior and supporting compact 4.7µH inductors and ceramic capacitors. It differs from the 1.6MHz LMR12007XMKX variant, which shares the same package and pinout but targets even smaller form factors.
Does the LMR12007YMKX require an external catch diode?
Yes, the LMR12007YMKX requires an external Schottky catch diode (e.g., MBRM110L) connected between SW and GND. Unlike synchronous buck regulators, it uses an internal NMOS switch and relies on this external diode to provide the freewheeling path during the switch-off period. Diode selection must consider forward voltage (≤0.7V recommended), reverse breakdown (>VINMAX), and RMS current rating.
How is the output voltage set on the LMR12007YMKX?
The output voltage of the LMR12007YMKX is set using a resistive divider from VOUT to FB to GND, based on the internal 1.25V reference. The formula is VOUT = 1.25V × (1 + R1/R2), where R2 is typically 10kΩ connected from FB to GND. For example, R1 = 2kΩ yields VOUT = 1.5V. The FB pin draws ≤250nA, so divider current should be ≥100× that (e.g., 100µA) to minimize regulation error.
What is the purpose of the BOOST pin on the LMR12007YMKX?
The BOOST pin on the LMR12007YMKX supplies gate drive voltage to the internal NMOS switch via an external bootstrap capacitor connected between BOOST and SW. During switch-off, the capacitor charges from VIN (or VOUT); during switch-on, it provides ~VIN-level gate voltage relative to SW, ensuring full enhancement of the 350mΩ NMOS. Proper BOOST–SW voltage (1.6V–5.5V) is essential for reliable 750mA operation.
Can the LMR12007YMKX operate with input voltage below 3.0V?
No, the LMR12007YMKX has a specified minimum input voltage of 3.0V per its operating ratings, and undervoltage lockout activates below 2.74V (rising) with 440mV hysteresis. Attempting operation below 3.0V risks failure to start or unstable regulation. For sub-3V applications, consider alternatives like the TPS62231 (2.05V min) or TPS6206x series, which are not pin-compatible with the LMR12007YMKX.
LMR12007YMKX 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
LMR12007YMKX FAQ
1.How can I place an order for LMR12007YMKX through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR12007YMKX 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 LMR12007YMKX reliable?
The price and inventory of LMR12007YMKX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR12007YMKX is usually 5 days.
3.What payment methods are accepted for LMR12007YMKX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR12007YMKX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR12007YMKX?
LMR12007YMKX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR12007YMKX 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 LMR12007YMKX?
For technical support, including LMR12007YMKX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR12007YMKX requirements.
6.How does Aetrix verify that LMR12007YMKX is sourced from the original manufacturer or authorized distributors?
All LMR12007YMKX 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 LMR12007YMKX meets industry standards.
7.What is the process for return or replacement of LMR12007YMKX?
All LMR12007YMKX units undergo pre-shipment inspection (PSI). If there is an issue with LMR12007YMKX, 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 LMR12007YMKX part is unused and in its original packaging.
Return procedure for LMR12007YMKX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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