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Texas Instruments LM2734YQMKX/NOPB
- Part No.:
- LM2734YQMKX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2734YQMKX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:99,947
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Product details
Overview
LM2734YQMKX/NOPB from Texas Instruments is a monolithic 550-kHz PWM step-down DC/DC regulator in a 6-pin Thin SOT-23 package, delivering 1-A output current with 3-V to 20-V input and 0.8-V to 18-V adjustable output. It integrates a 300-mΩ NMOS switch, 0.8-V ±2% internal reference, and current-mode control for local point-of-load regulation in space-constrained USB-powered devices.
For engineers reviewing the LM2734YQMKX/NOPB datasheet, LM2734YQMKX/NOPB pinout, LM2734YQMKX/NOPB application, or LM2734YQMKX/NOPB equivalent, key selection criteria include switching frequency (550 kHz), shutdown current (30 nA), thermal shutdown behavior, and bootstrap capacitor interface requirements for gate drive integrity.
Technical Context
The LM2734YQMKX/NOPB implements fixed-frequency current-mode PWM control with internal compensation, enabling stable regulation across 3–20 V input without external loop components. Its 13-ns minimum on-time supports low-duty-cycle operation down to 0.8 V output even at high input voltages.
Operation relies on a bootstrap circuit where BOOST supplies gate drive voltage (VBOOST – VSW = 1.6–5.5 V) to the internal NMOS switch; feedback is taken from FB via resistor divider to set output voltage, while EN enables/disables regulation with 0.4-V shutdown threshold and 1.8-V enable threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 550 kHz - enables use of small 4.7 µH inductors and ceramic capacitors, reducing PCB area vs lower-frequency buck regulators |
| Output Current | 1 A continuous - supports core power delivery for HDDs, DSL modems, and notebook subsystems without external pass devices |
| Input Voltage Range | 3 V to 20 V - accommodates wide-input industrial and battery-backed systems including 5 V USB and 12 V rail applications |
| Feedback Reference | 0.8 V ±2% - sets output accuracy and stability; used with external R1/R2 divider to configure VOUT from 0.8 V to 18 V |
| Shutdown Current | 30 nA - minimizes standby power loss in battery-powered devices during sleep or suspend modes |
| Switch RDS(ON) | 300 mΩ typical - limits conduction loss at 1-A load; contributes to >90% peak efficiency at 5 VIN/3.3 VOUT |
| UVLO Threshold | 2.74 V rising / 2.3 V falling - prevents erratic startup or dropout during brownout conditions with 440 mV hysteresis |
Pinout & Package
LM2734YQMKX/NOPB uses a 6-pin Thin SOT-23 (DDC) package measuring 2.90 mm × 1.60 mm, optimized for high-density PCB layouts in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pin 1) | Bootstrap supply input | Connects to SW via 0.01 µF ceramic capacitor; provides gate drive voltage ≥1.6 V above SW to fully enhance internal NMOS switch |
| GND (Pin 2) | Signal and power ground | Reference node for FB divider bottom resistor; must be placed adjacent to FB for accurate regulation and noise immunity |
| FB (Pin 3) | Feedback input | Monitors output via resistive divider; error amplifier compares voltage to 0.8 V reference to adjust duty cycle |
| EN (Pin 4) | Enable control | Logic-high (>1.8 V) enables regulation; logic-low (<0.4 V) disables switching and reduces quiescent current to 30 nA |
| VIN (Pin 5) | Main input supply | Accepts 3–20 V; requires local 10 µF ceramic bypass capacitor to suppress high-frequency switching noise |
| SW (Pin 6) | Switch node output | Drives external inductor and catch diode; swings between VIN and −0.3 V during operation; connects to BOOST capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Internal soft start | Ramps reference voltage over ~200 µs to limit inrush current and prevent output overshoot during startup |
| Pulse-by-pulse current limit | 1.7 A typical switch current limit protects against short-circuit and overload by disabling switch each cycle exceeding threshold |
| Thermal shutdown | Activates at 165°C junction temperature and releases at ~150°C, preventing permanent damage during sustained overload |
| Output overvoltage protection | Shuts off switch when FB exceeds 0.88 V (10% above 0.8 V reference), safeguarding downstream loads from fault conditions |
| Current-mode control | Provides inherent line and load transient response improvement and simplifies loop compensation with single-pole response |
Applications
| Local Point-of-Load Regulation | USB-Powered Devices |
|---|---|
Use Scenario: Powering FPGA I/O banks or microcontroller peripherals from a shared 5 V bus in compact embedded systems. IC Role / Device Role / Timing Role: Step-down regulator providing tightly regulated 1.8 V or 3.3 V at up to 1 A with fast transient response to dynamic load changes. Use Value: Eliminates need for external compensation components and reduces solution size by >40% versus legacy 300-kHz buck ICs using larger magnetics. | Use Scenario: Supplying 3.3 V to USB-C peripheral controllers or Type-A hub logic where input is derived directly from 5 V USB port. IC Role / Device Role / Timing Role: Primary DC/DC converter managing input voltage drop across cable resistance while maintaining output regulation under varying load. Use Value: 30 nA shutdown current extends battery life in portable USB accessories; 550-kHz operation avoids audible noise in audio-enabled peripherals. |
| HDD Core Power | Notebook Computers |
Use Scenario: Delivering 1.2 V or 1.5 V to spindle motor drivers and servo controllers in 2.5-inch hard disk drives. IC Role / Device Role / Timing Role: High-efficiency buck regulator operating from 12 V or 5 V rail, supporting burst-mode loads during seek/write operations. Use Value: 300-mΩ RDS(ON) and current-mode control minimize voltage droop during 1-A peak currents, improving mechanical positioning accuracy. | Use Scenario: Generating auxiliary 5 V or 3.3 V rails for display backlight drivers, touchpad controllers, or USB charging circuits in ultrabooks. IC Role / Device Role / Timing Role: Secondary regulator decoupling main PMIC outputs, reducing EMI coupling into sensitive analog sections. Use Value: Thin SOT-23 package allows placement near load points with minimal trace inductance, improving PSRR above 1 MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2734XQMKX/NOPB | 1.6-MHz switching frequency vs 550 kHz; higher quiescent current (2.5 mA vs 1.5 mA); same package and pinout | Better suited for ultra-compact designs requiring smallest possible inductors; less optimal for noise-sensitive analog sections due to higher fundamental frequency | Select LM2734XQMKX/NOPB when board area is constrained and EMI filtering can accommodate 1.6-MHz harmonics. |
| TPS62231DRVR | 3-MHz fixed frequency; 0.6-V reference; 0.9- to 6-V input; 1-A output; WSON-6 package (2.0 × 2.0 mm) | Larger footprint but superior light-load efficiency via DCS-Control topology; lacks integrated OVP and thermal shutdown flag | Choose TPS62231DRVR for battery-powered applications needing >85% efficiency at 10-mA loads and tighter output tolerance. |
Compared with LM2734XQMKX/NOPB, the LM2734YQMKX/NOPB trades higher-frequency operation for lower EMI and better light-load efficiency; versus TPS62231DRVR, it offers integrated protection features and simpler layout at the cost of slightly larger solution size and reduced efficiency below 50 mA.
Availability
LM2734YQMKX/NOPB is available at Aetrix Electronics and suitable for local point-of-load regulation, USB-powered devices, and HDD core power applications requiring stable component supply across automotive infotainment, industrial HMIs, and consumer electronics production.
Supply support for LM2734YQMKX/NOPB 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 and embedded processing solutions, with leadership in power management ICs for industrial, automotive, and consumer markets.
The LM2734 product line delivers high-frequency, monolithic buck regulators targeting space-constrained, medium-power applications where simplicity, thermal robustness, and fast transient response are critical design requirements.
FAQ
What is the recommended boost capacitor value for LM2734YQMKX/NOPB?
The LM2734YQMKX/NOPB datasheet specifies a 0.01 µF (10 nF), 16-V X7R ceramic capacitor between BOOST and SW pins. This value ensures sufficient charge storage to maintain gate drive voltage across the full 550-kHz switching cycle while minimizing parasitic inductance. Larger values do not improve performance and may degrade startup behavior.
Does LM2734YQMKX/NOPB require an external catch diode?
Yes, LM2734YQMKX/NOPB requires an external Schottky diode (e.g., MBRM110L) connected from SW to GND. The IC contains only the NMOS switch and does not integrate synchronous rectification. The diode conducts inductor current during the switch off-time and must support 1-A peak current with ≤0.3 V forward voltage for optimal efficiency.
Can LM2734YQMKX/NOPB operate with a 2.5-V input supply?
No, LM2734YQMKX/NOPB cannot operate reliably with a 2.5-V input. Its undervoltage lockout (UVLO) activates below 2.74 V (typical), and the internal NMOS switch requires sufficient gate drive headroom (VBOOST – VSW ≥ 1.6 V). At 2.5 V input, bootstrap charging fails and regulation collapses before UVLO triggers.
How is output voltage set on LM2734YQMKX/NOPB?
Output voltage is set using a resistor divider from VOUT to GND, with the midpoint connected to FB. The formula is VOUT = 0.8 V × (1 + R1/R2), where R2 connects FB to GND. Texas Instruments recommends R2 = 10 kΩ for optimal noise immunity and bias current balance; R1 is calculated based on desired VOUT.
What thermal derating applies to LM2734YQMKX/NOPB at 125°C ambient?
At 125°C ambient, LM2734YQMKX/NOPB must be thermally derated due to its 158.1°C/W junction-to-ambient thermal resistance. With 1-A load and 5 VIN/3.3 VOUT, power dissipation is ~0.34 W; junction temperature rises ~54°C above ambient, reaching ~179°C - exceeding the 150°C absolute maximum. Derate output current to ≤650 mA or add copper pour and airflow to maintain TJ < 150°C.
LM2734YQMKX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Bulk
- 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):
- 20V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 18V
- Current - Output:
- 1A
- 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
LM2734YQMKX/NOPB FAQ
1.How can I place an order for LM2734YQMKX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2734YQMKX/NOPB 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 LM2734YQMKX/NOPB reliable?
The price and inventory of LM2734YQMKX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2734YQMKX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2734YQMKX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2734YQMKX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2734YQMKX/NOPB?
LM2734YQMKX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2734YQMKX/NOPB 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 LM2734YQMKX/NOPB?
For technical support, including LM2734YQMKX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2734YQMKX/NOPB requirements.
6.How does Aetrix verify that LM2734YQMKX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2734YQMKX/NOPB 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 LM2734YQMKX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2734YQMKX/NOPB?
All LM2734YQMKX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2734YQMKX/NOPB, 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 LM2734YQMKX/NOPB part is unused and in its original packaging.
Return procedure for LM2734YQMKX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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