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Texas Instruments LM2734XMK/NOPB
- Part No.:
- LM2734XMK/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2734XMK/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:1,044
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Product details
Overview
LM2734XMK/NOPB from Texas Instruments is a monolithic, current-mode PWM step-down DC/DC regulator in a 6-pin Thin SOT-23 package, delivering 1-A output current with 1.6-MHz fixed switching frequency, 3-V to 20-V input range, and 0.8-V to 18-V adjustable output voltage - used for local point-of-load regulation in space-constrained USB-powered devices and notebook computers.
For engineers reviewing the LM2734XMK/NOPB datasheet, LM2734XMK/NOPB pinout, LM2734XMK/NOPB application, or LM2734XMK/NOPB equivalent, key selection criteria include internal 300-mΩ NMOS switch RDS(ON), 30-nA shutdown current, 0.8-V ±2% reference, thermal shutdown, and current-limit protection at 1.7-A typical.
Technical Context
The LM2734XMK/NOPB implements constant-frequency current-mode control with internal compensation, enabling fast transient response and stable regulation across wide input/output conditions. Its 1.6-MHz oscillator supports ultra-small external inductors (e.g., 4.7 µH) and ceramic capacitors while maintaining ≥90% efficiency at 5-VIN/3.3-VOUT.
Operation relies on bootstrap gate drive (VBOOST–VSW = 1.6 V to 5.5 V), cycle-by-cycle current limiting, and soft-start with 200-µs reference ramp. UVLO activates at 2.74-V rising threshold with 440-mV hysteresis, and thermal shutdown engages at 165°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.6 MHz - enables use of sub-5-µH inductors and 0402/0603 ceramic caps, minimizing PCB area. |
| Input Voltage Range | 3 V to 20 V - supports single-cell Li-ion up to 18-V industrial rails without pre-regulation. |
| Output Current | 1 A continuous - sufficient for core logic, USB peripherals, and HDD preamp circuits. |
| RDS(ON) | 300 mΩ (typ) - reduces conduction loss and thermal rise at full load; max 600 mΩ over temp. |
| Feedback Reference | 0.8 V ±2% - sets output via resistor divider; enables precise 1.5-V, 1.8-V, 3.3-V, or 5-V generation. |
| Shutdown Current | 30 nA (typ) - preserves battery life in always-on systems; adds only 40 nA input leakage. |
| Current Limit | 1.7 A (typ), min 1.2 A - protects switch during overload or short-circuit without external sensing. |
| Thermal Shutdown | 165°C activation, 150°C recovery - prevents permanent damage during sustained overload or poor heatsinking. |
Pinout & Package
LM2734XMK/NOPB uses the DDC (Thin SOT-23-6) package: 2.90 mm × 1.60 mm body, 0.95 mm height, gull-wing leads. Thermal pad is not present; power dissipation relies on PCB copper and θJA = 158.1°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pin 1) | Bootstrap supply | Drives NMOS gate; requires 0.01-µF X7R capacitor to SW; must maintain 1.6–5.5 V above SW. |
| GND (Pin 2) | Signal & power ground | Reference for FB, EN, and internal circuits; feedback resistor bottom must connect here for accuracy. |
| FB (Pin 3) | Voltage feedback input | Senses output via resistor divider; 10-nA bias current enables high-impedance dividers. |
| EN (Pin 4) | Enable control | Logic-high (>1.8 V) enables operation; <0.4 V disables with 30-nA quiescent draw. |
| VIN (Pin 5) | Main input supply | Accepts 3–20 V; requires local 10-µF X5R bypass cap near pin to suppress ripple and EMI. |
| SW (Pin 6) | Switch node | Connects to inductor, catch diode cathode, and BOOST capacitor; swings from GND to VIN − RDS(ON)·IOUT. |
Key Features
| Feature | Design Value |
|---|---|
| Internal 300-mΩ NMOS switch | Eliminates external MOSFET and driver, reducing BOM count and layout complexity for 1-A loads. |
| 1.6-MHz fixed-frequency PWM | Enables compact 4.7-µH inductors and low-ESR ceramic output caps without compromising stability. |
| 0.8-V ±2% internal reference | Supports accurate 1.5-V, 1.8-V, 3.3-V outputs using standard 1% resistors; no external reference needed. |
| Internal soft-start (200 µs) | Controls output ramp rate to limit inrush current into large output capacitance, preventing input droop. |
| Output overvoltage protection | Shuts off switch if FB exceeds 0.88 V (10% above reference), protecting downstream ICs during feedback fault. |
| Thermal shutdown + UVLO | Prevents operation below 2.74 V input or above 165°C junction; hysteresis avoids oscillation during brownout. |
Applications
| USB-Powered Devices | Notebook Computers |
|---|---|
Use Scenario: Powering USB-C peripheral hubs, portable SSD enclosures, or OTG adapters from 5-V bus. IC Role / Device Role / Timing Role: Primary buck converter generating clean 3.3-V or 1.8-V rail from unregulated 5-V USB source. Use Value: 1.6-MHz operation allows tiny 0603 inductors and 0402 ceramics, meeting strict board area limits in dongles. | Use Scenario: Supplying I/O interface logic (e.g., PCIe retimers, USB controllers) in ultrabook mainboards. IC Role / Device Role / Timing Role: Local point-of-load regulator converting 12-V or 5-V system rail to 1.5-V or 1.05-V core voltage. Use Value: 1-A capability and 30-nA shutdown current extend battery runtime during sleep states. |
| HDD Core Power | DSL Modems |
Use Scenario: Delivering regulated 3.3-V or 5-V to HDD preamp and servo control ICs in external storage enclosures. IC Role / Device Role / Timing Role: High-efficiency buck stage replacing linear regulators to reduce heat in thermally constrained enclosures. Use Value: ≥90% efficiency at 5-VIN/3.3-VOUT minimizes thermal load; thermal shutdown prevents failure under sustained write loads. | Use Scenario: Generating 3.3-V and 1.8-V rails for DSL PHY, microcontroller, and memory in residential gateways. IC Role / Device Role / Timing Role: Dual-rail power solution where LM2734XMK/NOPB supplies one rail and a second LM2734 variant supplies another. Use Value: Internal compensation and current-mode control ensure stable regulation despite varying line/load transients from DSL signal bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2734YMK/NOPB | 550-kHz switching frequency, higher minimum duty cycle (1%), lower boost current (1.0–1.8 mA). | Better suited for higher-output-voltage designs (e.g., 5-V out from 12-V in) where lower frequency eases EMI filtering. | Select when board area allows larger inductors/caps and lower EMI priority outweighs size advantage. |
| TPS62231DRVR | 3-MHz switching, 0.6-V reference, 600-mA output, integrated sync rectifier, smaller 2-mm × 2-mm WSON. | Optimized for ultra-low-power, low-current applications (e.g., MCU cores); lacks 1-A capability and 20-V input. | Choose only for sub-600-mA loads requiring smallest footprint; not a functional replacement for 1-A demands. |
Compared with LM2734YMK/NOPB, LM2734XMK/NOPB trades lower EMI susceptibility for superior miniaturization; versus TPS62231DRVR, it delivers double the output current and wider input range but in a slightly larger package - making LM2734XMK/NOPB optimal for space-constrained 1-A PoL needs.
Availability
LM2734XMK/NOPB is available at Aetrix Electronics and suitable for USB-powered devices, notebook computers, HDD core power, and DSL modems requiring stable component supply, long-term lifecycle support, and consistent parametric performance.
Supply support for LM2734XMK/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 leader designing analog ICs, embedded processors, and power management solutions for industrial, automotive, and consumer applications.
The LM2734 product line delivers high-frequency, monolithic buck regulators optimized for space-constrained point-of-load conversion with minimal external components and robust protection features.
FAQ
What is the maximum input voltage rating for LM2734XMK/NOPB?
The absolute maximum input voltage for LM2734XMK/NOPB is 24 V, but recommended operating conditions specify 3 V to 20 V. Exceeding 20 V may trigger undervoltage lockout hysteresis or reduce reliability; sustained operation above 20 V is not advised per TI's SNVS288K datasheet Section 6.1 and 6.3.
Does LM2734XMK/NOPB require an external bootstrap diode?
No, LM2734XMK/NOPB does not require an external bootstrap diode. The internal circuitry charges the BOOST capacitor (CBOOST) during startup, and the device operates with only an external 0.01-µF ceramic capacitor between BOOST and SW pins - as confirmed in Figure 13 and Section 8.1.1 of the official datasheet.
Can LM2734XMK/NOPB be used with ceramic output capacitors?
Yes, LM2734XMK/NOPB is fully compatible with ceramic output capacitors. Its current-mode control and internal compensation ensure stability with low-ESR ceramics; typical designs use 10-µF X5R/X7R caps, as shown in Table 1 (Figure 16) and Section 8.2.1.2 of the datasheet.
What is the typical shutdown current of LM2734XMK/NOPB?
The typical shutdown current of LM2734XMK/NOPB is 30 nA at 25°C, with additional 40 nA input leakage from SW pin. This value is specified in Section 6.5 Electrical Characteristics (IQ shutdown row) and validated across –40°C to 125°C per TI SNVS288K Rev K.
How does the feedback pin (FB) of LM2734XMK/NOPB function in regulation?
The FB pin of LM2734XMK/NOPB senses the output voltage via an external resistor divider and compares it to the internal 0.8-V reference. With only 10-nA input bias current, it enables high-impedance dividers (e.g., 8.87 kΩ/10.2 kΩ for 1.5-V out), and regulation error is corrected by adjusting switch duty cycle in real time using current-mode PWM control.
LM2734XMK/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- 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):
- 20V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 18V
- Current - Output:
- 1A
- 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
LM2734XMK/NOPB FAQ
1.How can I place an order for LM2734XMK/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2734XMK/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 LM2734XMK/NOPB reliable?
The price and inventory of LM2734XMK/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2734XMK/NOPB is usually 5 days.
3.What payment methods are accepted for LM2734XMK/NOPB?
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4.How is shipping managed for LM2734XMK/NOPB?
LM2734XMK/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2734XMK/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 LM2734XMK/NOPB?
For technical support, including LM2734XMK/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2734XMK/NOPB requirements.
6.How does Aetrix verify that LM2734XMK/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2734XMK/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 LM2734XMK/NOPB meets industry standards.
7.What is the process for return or replacement of LM2734XMK/NOPB?
All LM2734XMK/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2734XMK/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 LM2734XMK/NOPB part is unused and in its original packaging.
Return procedure for LM2734XMK/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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