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Texas Instruments LMR12007XMK
- Part No.:
- LMR12007XMK
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LMR12007XMK.pdf
- Description:
- IC REG BUCK ADJ 750MA SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,954
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Product details
Overview
LMR12007XMK 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 1.6MHz fixed switching frequency, 3.0V–18V input range, and 1.25V–16V adjustable output voltage-designed for space-constrained point-of-load regulation in battery-powered and USB-powered devices.
For engineers reviewing the LMR12007XMK datasheet, LMR12007XMK pinout, LMR12007XMK application, or LMR12007XMK equivalent, key selection criteria include its 350mΩ internal NMOS switch RDS(ON), 30nA shutdown current, 1.25V ±2% internal reference, thermal shutdown protection, and compatibility with ceramic output capacitors for high-frequency transient response.
Technical Context
The LMR12007XMK employs current-mode PWM control with internal compensation and a fixed 1.6MHz oscillator, enabling stable regulation without external loop components. Its bootstrap gate-drive architecture (BOOST–SW ≥ 1.6V) supports efficient operation across wide input/output combinations using a single external Schottky catch diode and small-surface-mount inductors.
It integrates undervoltage lockout (2.74V rising threshold), cycle-by-cycle current limiting (1.5A typical), soft-start (200µs ramp), and output overvoltage protection (10% above VFB). The 6-pin Thin SOT-23 (DDC) package features thermally enhanced GND pad and requires careful PCB layout for BOOST/SW node routing and FB trace isolation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.6MHz - enables use of ≤4.7µH inductors and 0805/1206 ceramic capacitors, minimizing solution footprint. |
| Input Voltage Range | 3.0V to 18V - supports single-cell Li-ion, 5V/12V rails, and industrial input sources without pre-regulation. |
| Output Current | 750mA - sufficient for core logic, microcontrollers, and interface ICs in portable and embedded systems. |
| RDS(ON) | 350mΩ - reduces conduction loss at full load; enables >90% efficiency at 5V→3.3V/500mA. |
| Feedback Reference | 1.25V ±2% - sets output via resistor divider; allows precise 1.25V–16V adjustment with <0.01%/V line regulation. |
| Shutdown Current | 30nA - preserves battery life in always-on or low-power sleep modes. |
| Thermal Shutdown | 165°C junction - protects against sustained overload or poor heatsinking; resumes at ~150°C. |
Pinout & Package
Package: 6-pin Thin SOT-23 (Package Number DDC, R-PDSO-G6), 1.6mm × 2.9mm × 0.8mm, thermally enhanced GND pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BOOST | Bootstrap supply node | Drives NMOS gate; requires 0.01µF ceramic capacitor to SW; must maintain ≥1.6V above SW for reliable switching. |
| 2 - GND | Signal and power ground | Reference for FB divider and internal circuits; bottom resistor of feedback network must connect here for accuracy. |
| 3 - FB | Voltage feedback input | High-impedance node (250nA bias); connects to resistor divider; sensitive to noise-must be routed short and away from SW/VIN. |
| 4 - EN | Enable control input | Logic-high (>1.8V) enables regulation; floating or >VIN+0.3V risks damage; logic-low disables with 30nA quiescent draw. |
| 5 - VIN | Main input supply | Accepts 3V–18V; requires local 10µF X5R/X7R ceramic bypass capacitor close to pin with low-ESL layout. |
| 6 - SW | Internal switch output | Connects to inductor, catch diode anode, and BOOST capacitor; carries high di/dt-requires tight loop with GND and CIN. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 1.6MHz switching | Enables compact 4.7µH inductors and eliminates audible noise; avoids EMI bands common in 500kHz–1MHz designs. |
| Internal 350mΩ NMOS switch | Eliminates external MOSFET and driver; reduces BOM count and layout complexity while maintaining 750mA capability. |
| Current-mode PWM control | Provides inherent cycle-by-cycle current limiting, fast transient response, and stable operation without external compensation. |
| Integrated soft-start | Ramps internal reference from 0V to 1.25V over ~200µs-limits inrush current into output capacitance during power-up. |
| Thermal shutdown + OVP | Shuts down at 165°C junction; disables switch if FB exceeds 1.375V (10% above 1.25V), protecting downstream loads. |
Applications
| USB Powered Devices | Battery Powered Devices |
|---|---|
|
Use Scenario: Powering USB peripherals (e.g., USB-C audio adapters, HID controllers) from 5V bus with strict size constraints. IC Role / Device Role / Timing Role: Primary DC-DC converter regulating 3.3V or 1.8V rail from 5V USB input. Use Value: 1.6MHz operation allows 4.7µH inductor and 10µF ceramic output cap-fits sub-100mm² PCB area. |
Use Scenario: Core power supply for wearable sensors or Bluetooth LE modules operating from single-cell Li-ion (3.0–4.2V). IC Role / Device Role / Timing Role: Step-down regulator delivering 1.8V/750mA to MCU and RF transceiver. Use Value: 30nA shutdown current extends battery runtime in deep-sleep modes; 3.0V minimum VIN supports full discharge. |
| Notebook Computers | DSL Modems |
|
Use Scenario: Local 1.2V or 1.5V supply for I/O controller or display interface in thin-client notebooks. IC Role / Device Role / Timing Role: Point-of-load regulator converting 5V or 12V system rail to low-voltage logic rail. Use Value: Thin SOT-23 package fits dense motherboard layouts; 1.25V reference enables accurate DDR termination voltage. |
Use Scenario: Powering ADSL line drivers and PHY ICs in residential DSL modems with 12V input. IC Role / Device Role / Timing Role: Secondary regulator generating 3.3V for digital baseband and 1.2V for analog front-end. Use Value: 18V max VIN accommodates unregulated 12V supplies with ripple; thermal shutdown prevents latch-up under surge conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR12007YMK | 550kHz switching frequency, higher maximum duty cycle (96%), lower boost current demand. | Better suited for higher VIN/VOUT ratios (e.g., 12V→5V) where lower frequency improves efficiency and reduces EMI filtering cost. | Select LMR12007YMK when board space allows larger inductors/caps and EMI compliance favors sub-1MHz operation. |
| TPS62231DRVR | 3MHz switching, 600mA output, 2.05V–6.5V input, integrated synchronous rectification. | Requires no external catch diode; optimized for 3.3V/5V input rails only-not suitable for 12V/18V industrial inputs. | Choose TPS62231DRVR only for compact 3.3V-input applications where synchronous efficiency outweighs input voltage limitation. |
Compared with LMR12007XMK, the LMR12007YMK trades higher frequency for improved light-load efficiency and relaxed EMI filtering, while the TPS62231DRVR offers synchronous integration but sacrifices input voltage range and output current capability-making LMR12007XMK optimal for 3–18V, 750mA, space-constrained designs requiring external diode flexibility.
Availability
LMR12007XMK is available at Aetrix Electronics and suitable for USB powered devices, battery powered devices, notebook computers, DSL modems, and set-top boxes requiring stable component supply and long-term production continuity.
Supply support for LMR12007XMK 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 LMR12007XMK belongs to TI's LMR family of monolithic buck regulators-designed specifically for ultra-compact, high-frequency point-of-load applications where thermal performance, low quiescent current, and minimal external components are critical.
FAQ
What is the switching frequency of the LMR12007XMK?
The LMR12007XMK has a fixed internal switching frequency of 1.6MHz. This value is factory-trimmed and not user-adjustable. It enables use of small 4.7µH inductors and ceramic capacitors, reducing solution size versus lower-frequency alternatives like the LMR12007YMK (550kHz). Efficiency remains above 90% at 5V→3.3V/500mA due to optimized gate drive and low RDS(ON).
Does the LMR12007XMK require an external catch diode?
Yes, the LMR12007XMK requires an external Schottky catch diode (e.g., MBRM110L) connected between SW and GND. Unlike synchronous buck converters, it uses an internal NMOS switch and external diode for freewheeling. The diode must handle peak currents up to 1.5A and have low forward voltage (≤0.4V) to maintain efficiency-especially critical at high duty cycles.
How is the output voltage set on the LMR12007XMK?
The LMR12007XMK output voltage is set by a resistor divider from VOUT to FB to GND. Using R2 = 10kΩ to GND, R1 = (VOUT − 1.25V) × R2 / 1.25V. For example, 3.3V output requires R1 ≈ 16.4kΩ. The FB pin has 250nA bias current, so total divider current should exceed 100× this (≥25µA) to minimize error-typically achieved with 10kΩ–100kΩ values.
What is the purpose of the BOOST pin on the LMR12007XMK?
The BOOST pin on the LMR12007XMK supplies gate drive voltage to the internal NMOS switch via a bootstrap capacitor (0.01µF ceramic) connected between BOOST and SW. During SW low-time, BOOST charges to VIN minus diode drop; during SW high-time, BOOST rises to ~2×VIN, ensuring sufficient VGS. Maintaining BOOST–SW ≥ 2.5V (max 5.5V) is essential for full 750mA output capability and low RDS(ON) performance.
Can the LMR12007XMK operate with input voltage below 3.0V?
No, the LMR12007XMK has a guaranteed minimum operating input voltage of 3.0V per its Absolute Maximum and Operating Ratings. Undervoltage lockout activates below 2.74V (rising) and releases only above 2.3V (falling) with hysteresis. Attempting operation below 3.0V may result in unstable regulation, dropout, or failure to start-especially with BOOST capacitor charging limitations at low VIN.
LMR12007XMK 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:
- 1.6MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
LMR12007XMK FAQ
1.How can I place an order for LMR12007XMK through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR12007XMK 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 LMR12007XMK reliable?
The price and inventory of LMR12007XMK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR12007XMK is usually 5 days.
3.What payment methods are accepted for LMR12007XMK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR12007XMK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR12007XMK?
LMR12007XMK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR12007XMK 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 LMR12007XMK?
For technical support, including LMR12007XMK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR12007XMK requirements.
6.How does Aetrix verify that LMR12007XMK is sourced from the original manufacturer or authorized distributors?
All LMR12007XMK 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 LMR12007XMK meets industry standards.
7.What is the process for return or replacement of LMR12007XMK?
All LMR12007XMK units undergo pre-shipment inspection (PSI). If there is an issue with LMR12007XMK, 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 LMR12007XMK part is unused and in its original packaging.
Return procedure for LMR12007XMK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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