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Texas Instruments LM2734XMKX/NOPB
- Part No.:
- LM2734XMKX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2734XMKX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,779
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Product details
Overview
LM2734XMKX/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. It integrates a 300-mΩ NMOS power switch and internal soft-start for point-of-load regulation in space-constrained USB-powered devices.
For engineers reviewing the LM2734XMKX/NOPB datasheet, LM2734XMKX/NOPB pinout, LM2734XMKX/NOPB application, or LM2734XMKX/NOPB equivalent, key selection criteria include its 1.6-MHz operation enabling ultra-small external inductors, 30-nA shutdown current for battery longevity, and internal compensation eliminating loop stability tuning.
Technical Context
The LM2734XMKX/NOPB uses constant-frequency current-mode control with internal slope compensation and a 0.8-V ±2% reference to regulate output voltage via feedback resistor divider on the FB pin. Its 1.6-MHz oscillator enables minimum on-times of 13 ns, supporting high duty-cycle operation down to 0.8 V output even at 20-V input.
Operation relies on bootstrap gate drive: the BOOST pin supplies gate voltage ≥2.5 V above SW during NMOS conduction, derived via external diode and capacitor from VIN or VOUT. Protection includes cycle-by-cycle current limit (1.7-A typical), thermal shutdown at 165°C, and undervoltage lockout with 2.74-V turn-on threshold and 440-mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.6 MHz - Enables use of ≤4.7-µH surface-mount inductors and chip capacitors, minimizing PCB area. |
| Input Voltage Range | 3 V to 20 V - Supports wide-input applications including USB PD, industrial 12-V rails, and automotive accessory systems. |
| Output Current | 1 A continuous - Delivers full rated load without external current-sense resistors or heatsinking in SOT-23-THIN package. |
| RDS(ON) | 300 mΩ (typ) - Limits conduction loss to <300 mW at 1-A load, enabling >90% efficiency at 5-VIN/3.3-VOUT. |
| Shutdown Current | 30 nA - Extends battery life in portable devices by reducing quiescent draw during sleep mode. |
| Feedback Reference | 0.8 V ±2% - Allows precise output setting from 0.8 V to 18 V using standard resistor dividers; supports low-voltage core rails. |
| Max Duty Cycle | 92% - Permits high step-down ratios (e.g., 20-VIN to 3.3-VOUT) while maintaining regulation under line transients. |
Pinout & Package
LM2734XMKX/NOPB is housed in a 6-pin Thin SOT-23 (DDC) package measuring 2.90 mm × 1.60 mm, optimized for thermal performance with RθJA = 158.1°C/W and RθJB = 29.5°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pin 1) | Bootstrap supply input | Drives NMOS gate; requires external capacitor to SW to generate ≥2.5-V gate overdrive; must stay within −0.5 V to 30 V absolute max. |
| GND (Pin 2) | Signal and power ground | Reference for FB divider bottom resistor; placement near this pin minimizes noise-induced regulation error. |
| FB (Pin 3) | Feedback input | Connects to resistor divider midpoint; senses output voltage; internal 0.8-V reference sets VOUT = 0.8 × (1 + R1/R2). |
| EN (Pin 4) | Enable control | Logic-high (>1.8 V) enables regulation; logic-low (<0.4 V) disables switch and reduces IQ to 30 nA; must not exceed VIN + 0.3 V. |
| VIN (Pin 5) | Main input supply | Accepts 3–20 V; requires local 10-µF ceramic bypass capacitor; UVLO activates below 2.74 V to prevent erratic startup. |
| SW (Pin 6) | Switch node output | Drives external inductor and catch diode; swings from GND to VIN − ILOAD×RDS(ON); connects to BOOST capacitor negative terminal. |
Key Features
| Feature | Design Value |
|---|---|
| Internal compensation | Eliminates need for external compensation network-reduces BOM count and layout sensitivity across 0.8–18-V output range. |
| Current-mode PWM control | Provides inherent cycle-by-cycle current limiting and fast transient response without requiring external current-sense components. |
| Internal soft-start | Ramps reference from 0 V to 0.8 V over ~200 µs, limiting inrush current into output capacitors and preventing overshoot during startup. |
| Output overvoltage protection | Shuts off NMOS switch when FB exceeds 0.88 V (10% above 0.8-V reference), protecting downstream loads from fault conditions. |
| Thermal shutdown | Disables switching at 165°C junction temperature and re-enables only after cooling to ~150°C, preventing permanent silicon damage. |
Applications
| USB-Powered Devices | Battery-Powered Portable Electronics |
|---|---|
|
Use Scenario: Powering FPGA I/O banks or microcontroller peripherals from a 5-V USB port with tight board space constraints. IC Role / Device Role / Timing Role: Primary step-down regulator converting 5-V USB input to 1.8-V or 3.3-V rail with minimal external components. Use Value: 1.6-MHz operation allows 2.2-µH inductor and 10-µF ceramic output cap, reducing solution size by >40% vs. 500-kHz alternatives. |
Use Scenario: Supplying core voltage to Bluetooth SoCs or PMUs in hearing aids and wearables operating from single-cell Li-ion batteries. IC Role / Device Role / Timing Role: High-efficiency buck converter maintaining stable 1.2-V output across 3.0–4.2-V battery discharge curve. Use Value: 30-nA shutdown current extends shelf life; 90% peak efficiency at 100-mA load preserves runtime during intermittent sensing cycles. |
| Notebook Computer Subsystems | DSL Modem Power Management |
|
Use Scenario: Local regulation for display backlight drivers or SSD controllers where EMI must be minimized and thermal headroom is limited. IC Role / Device Role / Timing Role: Compact, high-frequency DC/DC converter replacing larger discrete solutions in thin-bezel laptop designs. Use Value: Fixed 1.6-MHz frequency avoids audible noise; internal soft-start prevents brownout during hot-plug events on PCIe auxiliary rails. |
Use Scenario: Generating 3.3-V and 5-V rails from 12-V wall adapter in residential DSL modems with strict cost and footprint targets. IC Role / Device Role / Timing Role: Dual-rail power supply IC supporting both analog front-end and digital baseband sections. Use Value: 3-V to 20-V input range accommodates unregulated 12-V adapters; 1-A capability covers combined load of PHY, MAC, and memory. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2734YMKX/NOPB | 550-kHz switching frequency, 96% max duty cycle, lower boost current (1.0–1.8 mA), higher RDS(ON) tolerance (600 mΩ max) | Better suited for higher-current, lower-frequency designs where inductor size is less constrained and EMI filtering is simpler | Select LM2734YMKX/NOPB when board space permits larger inductors and system-level EMI requirements favor sub-1-MHz operation. |
| TPS62231DRVR | 3-MHz switching frequency, 0.6-V reference, integrated synchronous rectifier, 2.05-V min input, no external BOOST capacitor required | Enables smaller total solution size but requires tighter input voltage control and lacks 3-V min input support | Choose TPS62231DRVR for ultra-compact designs powered from regulated 3.3-V or 5-V rails where synchronous efficiency outweighs input flexibility. |
Compared with LM2734YMKX/NOPB, the LM2734XMKX/NOPB trades higher switching loss for dramatically reduced passive component size; versus TPS62231DRVR, it offers wider input range and bootstrap simplicity at the cost of external diode and slightly lower light-load efficiency.
Availability
LM2734XMKX/NOPB is available at Aetrix Electronics and suitable for USB-powered devices, battery-powered portable electronics, and DSL modem power management requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2734XMKX/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, embedded processing, and power management ICs, with decades of leadership in DC/DC conversion technology and broad distribution through authorized channels.
The LM2734XMKX/NOPB belongs to TI's Thin SOT buck regulator product line, engineered specifically for space-constrained, high-frequency point-of-load applications where minimal external components and robust thermal performance are critical design requirements.
FAQ
What is the maximum input voltage rating for the LM2734XMKX/NOPB?
The LM2734XMKX/NOPB has an absolute maximum input voltage rating of 24 V, with recommended operation from 3 V to 20 V. Exceeding 24 V risks permanent damage per the Absolute Maximum Ratings table in the SNVS288K datasheet. For reliable long-term operation, maintain VIN ≤20 V and ensure transient spikes remain below 24 V using appropriate input clamping.
Does the LM2734XMKX/NOPB require an external catch diode?
Yes, the LM2734XMKX/NOPB 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 external diode for freewheeling current during the off-time. Omitting the diode will cause catastrophic failure due to unclamped inductive kickback at the SW pin.
How is the output voltage set on the LM2734XMKX/NOPB?
The LM2734XMKX/NOPB output voltage is set using a resistor divider from VOUT to GND, with the FB pin connected to the divider midpoint. The internal 0.8-V reference determines VOUT = 0.8 × (1 + R1/R2), where R1 is the top resistor and R2 the bottom. For example, R1 = 8.87 kΩ and R2 = 10.2 kΩ yields 1.5 V output. Layout best practice places R2 adjacent to GND pin to minimize noise coupling.
Can the LM2734XMKX/NOPB operate with a 2.5-V input supply?
No, the LM2734XMKX/NOPB cannot reliably operate with a 2.5-V input. Its undervoltage lockout (UVLO) turns on at 2.74 V (typical) and has 440-mV hysteresis, meaning it remains disabled until VIN rises above ~2.74 V and stays active only down to ~2.3 V. A 2.5-V supply falls within the UVLO hysteresis band and will cause unstable or no regulation.
What thermal derating applies to the LM2734XMKX/NOPB at 1-A load?
At 1-A load and 5-V input/3.3-V output, the LM2734XMKX/NOPB dissipates approximately 250 mW (PLOSS ≈ IOUT² × RDS(ON) + IOUT × VF). With RθJA = 158.1°C/W, this raises junction temperature by ~40°C above ambient. To maintain TJ ≤125°C, ambient must stay ≤85°C; above that, output current must be reduced per the thermal derating curve in Section 6.4 of the datasheet.
LM2734XMKX/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
LM2734XMKX/NOPB FAQ
1.How can I place an order for LM2734XMKX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2734XMKX/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 LM2734XMKX/NOPB reliable?
The price and inventory of LM2734XMKX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2734XMKX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2734XMKX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2734XMKX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2734XMKX/NOPB?
LM2734XMKX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2734XMKX/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 LM2734XMKX/NOPB?
For technical support, including LM2734XMKX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2734XMKX/NOPB requirements.
6.How does Aetrix verify that LM2734XMKX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2734XMKX/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 LM2734XMKX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2734XMKX/NOPB?
All LM2734XMKX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2734XMKX/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 LM2734XMKX/NOPB part is unused and in its original packaging.
Return procedure for LM2734XMKX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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