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Texas Instruments LM2734ZMKX
- Part No.:
- LM2734ZMKX
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2734ZMKX.pdf
- Description:
- IC REG BUCK ADJ 1A SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,910
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Product details
Overview
LM2734ZMKX from Texas Instruments (formerly National Semiconductor) is a monolithic 3 MHz PWM step-down DC-DC regulator in a 6-pin Thin SOT-23 (TSOT-6) package, delivering up to 1 A output current with internal 300 mΩ NMOS switch, 0.8 V ±2% reference, and 30 nA shutdown current. It operates from 3 V to 20 V input and supports adjustable output voltages from 0.8 V to 18 V - ideal for space-constrained point-of-load regulation in DSL modems and USB-powered devices.
For engineers reviewing the LM2734ZMKX datasheet, LM2734ZMKX pinout, LM2734ZMKX application, or LM2734ZMKX equivalent, key selection considerations include its fixed 3 MHz switching frequency, current-mode control architecture, internal soft-start, thermal shutdown, and compatibility with ceramic output capacitors for low-ESR, high-frequency transient response.
Technical Context
The LM2734ZMKX implements constant-frequency current-mode PWM control with internal compensation, enabling stable regulation across wide load and line variations without external loop components. Its 13 ns minimum on-time supports high duty-cycle operation down to 0.8 V output even at 20 V input.
It integrates a bootstrap-driven NMOS power switch, undervoltage lockout (2.74 V rising threshold), cycle-by-cycle current limit (1.7 A typical), and output overvoltage protection triggered at FB = 1.1 × VFB. The BOOST pin requires external capacitor and diode for gate drive, with recommended VBOOST–VSW between 2.5 V and 5.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | Fixed 3 MHz - enables use of sub-3 mm × 3 mm inductors and chip-scale ceramic capacitors, minimizing PCB footprint. |
| Input Voltage Range | 3.0 V to 20 V - supports wide-input industrial, USB, and automotive-supplied systems without pre-regulation. |
| Output Voltage Range | 0.8 V to 18 V (adjustable via resistor divider) - accommodates core logic, I/O, and analog rail requirements. |
| Max Output Current | 1 A continuous - delivered using integrated 300 mΩ NMOS switch (TSOT-6 package), reducing BOM count and layout complexity. |
| Feedback Reference | 0.800 V ±2% - enables precise output regulation; used with external resistive divider to set VOUT. |
| Shutdown Current | 30 nA - ensures ultra-low power loss during system sleep modes, critical for battery-backed applications. |
| Operating Junction Temp | −40°C to +125°C - qualified for industrial and automotive environments; thermal shutdown activates at 165°C. |
Pinout & Package
LM2734ZMKX is packaged in a 6-pin Thin SOT-23 (TSOT-6, NS Package Number MK06A), with exposed die attach pad (DAP) internally connected to GND for enhanced thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BOOST | Bootstrap supply node | Drives NMOS gate via external capacitor; must be ≥2.5 V above SW for full switch enhancement and efficiency. |
| 2 - GND | Signal and power ground | Reference for feedback network and internal circuitry; bottom resistor of FB divider must connect here for accuracy. |
| 3 - FB | Feedback input | High-impedance (250 nA max bias) node monitoring output via resistor divider; sets regulated VOUT = 0.8 V × (1 + R1/R2). |
| 4 - EN | Enable control input | Logic-high (>1.8 V) enables regulation; logic-low (<0.4 V) enters 30 nA shutdown; must not float or exceed VIN + 0.3 V. |
| 5 - VIN | Main input supply | Accepts 3–20 V; requires local 10 µF ceramic bypass capacitor near pin to suppress switching transients. |
| 6 - SW | Switch node output | Connects to inductor, catch diode cathode, and BOOST capacitor; swings between ~0 V (off) and VIN − IOUT×RDS(ON) (on). |
| DAP | Die Attach Pad | Internally tied to GND; must be soldered to PCB ground plane with ≥4 thermal vias for thermal management (θJA = 118°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Internal NMOS Switch | 300 mΩ RDS(ON) in TSOT-6 package - eliminates external MOSFET, reduces component count, and improves power density. |
| Current-Mode Control | Enables inherent cycle-by-cycle current limiting and fast transient response without external compensation components. |
| Internal Soft-Start | 200 µs reference ramp - limits inrush current during startup, preventing input voltage droop and output overshoot. |
| Output Overvoltage Protection | Shuts off SW when FB exceeds 1.1 × 0.8 V - protects downstream loads from fault-induced overvoltage events. |
| Thermal Shutdown | Activates at 165°C junction temperature and releases at ~150°C - prevents permanent damage under sustained overload or poor heatsinking. |
Applications
| DSL Modems | USB-Powered Devices |
|---|---|
|
Use Scenario: Powering PHY, DSP, and interface ICs in compact DSL modem designs with limited board area and strict EMI limits. IC Role / Device Role / Timing Role: Primary point-of-load regulator converting 5 V USB or 12 V adapter input to 3.3 V/1.8 V rails. Use Value: 3 MHz switching avoids AM radio band interference; small inductor/capacitor size enables <100 mm² solution area. |
Use Scenario: Regulating 5 V USB input to 3.3 V or 1.2 V for microcontrollers, sensors, and USB peripherals in portable equipment. IC Role / Device Role / Timing Role: Efficient buck converter with ultra-low shutdown current preserving battery life during idle states. Use Value: 30 nA shutdown current extends runtime in battery-backed USB hubs and dongles; internal soft-start prevents bus reset. |
| Local Point-of-Load Regulation | Automotive Infotainment |
|
Use Scenario: Delivering clean, tightly regulated power to FPGAs, ASICs, or DDR memory in embedded controllers where remote supplies are noisy. IC Role / Device Role / Timing Role: Local DC-DC converter placed adjacent to load to minimize IR drop and improve PSRR. Use Value: Current-mode control provides >60 dB PSRR at 100 kHz; 0.8 V reference enables accurate core voltage scaling. |
Use Scenario: Supplying 5 V or 3.3 V rails for display controllers, audio codecs, and CAN transceivers in automotive head units. IC Role / Device Role / Timing Role: Industrial-grade buck regulator supporting −40°C to +125°C operation with AEC-Q100-compliant variants available. Use Value: Wide 3–20 V input range tolerates cold-crank (6.5 V) and load-dump (20 V) conditions; thermal shutdown ensures reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC-DC regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 2.25–6.5 V input, 3 MHz, 0.6 V reference, 0.95 A max, WSON-6 package (0.9 mm height) | Better suited for low-input systems (e.g., single-cell Li-ion); lacks UVLO hysteresis and OVP | Select when input is ≤6.5 V and board height is constrained; verify external compensation needed for stability. |
| MP2101DJ-LF-Z | 2.5–6 V input, 1.5 MHz, 0.8 V reference, 1 A, TSOT23-6, no internal soft-start or OVP | Limited input range; lower frequency increases inductor size; missing safety features | Consider only for cost-sensitive, non-safety-critical 5 V–3.3 V conversion; add external soft-start if required. |
Compared with LM2734ZMKX, TPS62231DRYR offers tighter input range and lower profile but omits overvoltage protection and UVLO hysteresis, while MP2101DJ-LF-Z trades switching frequency and protection features for lower cost - making LM2734ZMKX preferable for wide-input, safety-aware designs.
Availability
LM2734ZMKX is available at Aetrix Electronics and suitable for DSL modems, USB-powered devices, and local point-of-load regulation requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2734ZMKX 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 acquired National Semiconductor in 2011 and maintains its legacy power management portfolio with full datasheet, simulation, and design tool support.
The LM2734Z series was designed for high-density, high-frequency DC-DC conversion in space-constrained industrial and consumer applications - emphasizing minimal external components, fast transient response, and robust protection features.
FAQ
What is the maximum input voltage rating for the LM2734ZMKX?
The LM2734ZMKX has an absolute maximum input voltage rating of 24 V, but its specified operating input range is 3 V to 20 V. Operation beyond 20 V may cause premature UVLO exit or overstress internal circuitry; sustained use above 20 V voids guaranteed performance and reliability. Always refer to the Absolute Maximum Ratings table in the official TI datasheet for LM2734ZMKX.
Does the LM2734ZMKX require external compensation components?
No, the LM2734ZMKX uses internal compensation optimized for current-mode control, eliminating the need for external Type-II or Type-III compensation networks. This simplifies design and reduces bill-of-materials count. However, proper PCB layout - especially short FB trace routing and solid GND connections - remains essential to maintain loop stability and noise immunity for LM2734ZMKX.
Can the LM2734ZMKX operate with ceramic output capacitors only?
Yes, the LM2734ZMKX is fully compatible with ceramic output capacitors, including X7R and X5R MLCCs. Its current-mode architecture and internal compensation are designed for low-ESR capacitors, enabling excellent transient response and reduced output ripple. A minimum of 10 µF is recommended, and increasing capacitance improves load-step response without compromising stability for LM2734ZMKX.
What is the purpose of the BOOST pin on the LM2734ZMKX?
The BOOST pin on the LM2734ZMKX supplies gate drive voltage to the internal NMOS switch via an external bootstrap capacitor and diode. It must be maintained 2.5 V to 5.5 V above the SW pin voltage to ensure full enhancement of the 300 mΩ switch. Incorrect BOOST voltage results in increased conduction losses and reduced efficiency - a critical design consideration for reliable LM2734ZMKX operation.
Is the LM2734ZMKX pin-compatible with the LM2734ZQ automotive variant?
No, LM2734ZMKX (TSOT-6, standard grade) and LM2734ZQMKX (TSOT-6, AEC-Q100 Grade 1) share identical pinout and package outline (MK06A), but differ in process flow, test screening, and qualification. They are mechanically interchangeable, yet LM2734ZMKX is not certified for automotive use. For automotive applications, LM2734ZQMKX must be selected to meet AEC-Q100 requirements - LM2734ZMKX does not substitute in those designs.
LM2734ZMKX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 18V
- Current - Output:
- 1A
- Frequency - Switching:
- 3MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
LM2734ZMKX FAQ
1.How can I place an order for LM2734ZMKX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2734ZMKX 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 LM2734ZMKX reliable?
The price and inventory of LM2734ZMKX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2734ZMKX is usually 5 days.
3.What payment methods are accepted for LM2734ZMKX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2734ZMKX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2734ZMKX?
LM2734ZMKX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2734ZMKX 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 LM2734ZMKX?
For technical support, including LM2734ZMKX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2734ZMKX requirements.
6.How does Aetrix verify that LM2734ZMKX is sourced from the original manufacturer or authorized distributors?
All LM2734ZMKX 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 LM2734ZMKX meets industry standards.
7.What is the process for return or replacement of LM2734ZMKX?
All LM2734ZMKX units undergo pre-shipment inspection (PSI). If there is an issue with LM2734ZMKX, 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 LM2734ZMKX part is unused and in its original packaging.
Return procedure for LM2734ZMKX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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