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Texas Instruments LM2734YMK
- Part No.:
- LM2734YMK
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2734YMK.pdf
- Description:
- IC REG BUCK ADJ 1A SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,328
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Product details
Overview
LM2734YMK from Texas Instruments is a monolithic 550-kHz PWM step-down DC/DC regulator in a Thin SOT-23-6 package, delivering 1-A output current with 0.8-V to 18-V adjustable output voltage. It integrates a 300-mΩ NMOS switch, internal soft-start, and current-mode control for fast transient response in space-constrained point-of-load applications such as USB-powered devices and notebook computers.
For engineers reviewing the LM2734YMK datasheet, LM2734YMK pinout, LM2734YMK application, or LM2734YMK equivalent, key selection criteria include its 550-kHz fixed switching frequency, 3-V to 20-V input range, 0.8-V ±2% reference accuracy, thermal shutdown protection, and ultra-low 30-nA shutdown current-critical for battery-powered and thermally sensitive designs.
Technical Context
The LM2734YMK employs current-mode PWM control with internal compensation and a 0.8-V, 2% precision reference to maintain regulation across line (3–20 V) and load (0–1 A) variations. Its 550-kHz oscillator enables use of small 4.7-µH inductors and ceramic capacitors while supporting minimum on-times down to 13 ns for low-duty-cycle operation at high input-to-output ratios.
Functional safety features include cycle-by-cycle current limiting (1.7-A typical), undervoltage lockout (2.74-V rising threshold with 440-mV hysteresis), overvoltage protection (10% above VREF), and thermal shutdown (165°C trip, 150°C recovery). The BOOST pin requires external bootstrap capacitor and diode to generate gate drive ≥2.5 V above SW for optimal NMOS conduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 550 kHz - enables compact 4.7-µH inductors and chip-scale ceramic output capacitors |
| Input Voltage Range | 3 V to 20 V - supports wide-input industrial and USB PD-compatible supplies |
| Output Voltage Range | 0.8 V to 18 V - adjustable via external resistor divider; 0.8-V reference enables core rail generation |
| Max Output Current | 1 A - sustained delivery with integrated 300-mΩ NMOS switch and thermal management |
| Feedback Reference | 0.8 V ±2% - ensures ±20-mV absolute output accuracy at light loads and full scale |
| Shutdown Current | 30 nA - preserves battery life in always-on systems during deep sleep modes |
| Current Limit | 1.7 A typical - protects against short-circuit and overload without external sensing |
Pinout & Package
LM2734YMK is housed in a 6-pin Thin SOT-23-6 (DDC) package measuring 2.90 mm × 1.60 mm, optimized for high-density PCB layouts with minimal thermal resistance (RθJA = 158.1°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pin 1) | Bootstrap supply | Drives NMOS gate; requires external capacitor to SW to sustain ≥2.5 V gate drive above SW during on-time |
| GND (Pin 2) | Signal & power ground | Reference for feedback network and internal regulators; must be placed adjacent to FB resistor bottom leg |
| FB (Pin 3) | Voltage feedback input | Senses output via resistor divider; 10-nA bias current enables high-impedance dividers with minimal error |
| EN (Pin 4) | Enable control | Logic-high (>1.8 V) enables regulation; logic-low (<0.4 V) forces 30-nA shutdown; must not exceed VIN + 0.3 V |
| VIN (Pin 5) | Main input supply | Accepts 3–20 V; requires local 10-µF ceramic bypass capacitor to suppress high-frequency ripple |
| SW (Pin 6) | Switch node | Connects to inductor, catch diode cathode, and BOOST capacitor; carries high dv/dt and pulsed current |
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 |
| 550-kHz fixed-frequency PWM | Enables predictable EMI filtering and consistent inductor sizing across designs |
| 0.8-V ±2% internal reference | Supports accurate 1.0-V, 1.2-V, 1.8-V, and 3.3-V rails without external trimming components |
| Internal soft-start (200 µs ramp) | Controls inrush current during power-up, preventing input rail collapse and output overshoot |
| Thermal shutdown (165°C) | Automatically disables switching under overload or poor heatsinking, recovering at ~150°C |
Applications
| USB-Powered Devices | Notebook Computers |
|---|---|
Use Scenario: Powering 3.3-V or 5-V peripherals from USB 2.0/3.0 host ports with limited current headroom. IC Role / Device Role / Timing Role: Primary buck regulator converting 5-V USB input to stable 3.3-V system rail. Use Value: 550-kHz operation allows tiny 4.7-µH inductor and 10-µF ceramic output cap, minimizing footprint on compact USB dongles. | Use Scenario: Generating 1.05-V CPU core voltage from 5-V or 12-V intermediate bus in ultraportable notebooks. IC Role / Device Role / Timing Role: Point-of-load converter delivering 1-A core power with tight regulation under dynamic load steps. Use Value: 0.8-V ±2% reference and current-mode control ensure <±30-mV output deviation during 1-A load transients. |
| Battery-Powered Devices | DSL Modems |
Use Scenario: Regulating 3.3-V logic rails from single-cell Li-ion (3.0–4.2 V) or dual-cell alkaline (1.8–3.2 V) batteries. IC Role / Device Role / Timing Role: High-efficiency buck converter operating across full battery discharge curve. Use Value: 30-nA shutdown current extends shelf life; 90% peak efficiency at 500-mA load preserves runtime. | Use Scenario: Providing isolated 3.3-V and 5-V rails for PHY, microcontroller, and memory in residential DSL gateways. IC Role / Device Role / Timing Role: Secondary DC/DC stage stepping down 12-V wall adapter output to digital subsystem voltages. Use Value: Thermal shutdown and UVLO (2.74-V start) prevent malfunction during brownout or overheating in enclosed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2734XMK | 1.6-MHz switching frequency vs. 550 kHz; identical pinout and package | Requires smaller 1.0-µH inductor but increases switching losses at high input voltage | Select for ultra-compact designs where board area outweighs efficiency trade-offs |
| TPS62231DRVR | 3-MHz fixed frequency, 0.6-V reference, 600-mA max output, 1.5-mm × 1.5-mm WSON-6 | Limited to lower-current applications; lacks BOOST pin and external diode requirement | Choose when 600-mA output suffices and integrated synchronous rectification is preferred |
Compared with LM2734XMK, the LM2734YMK offers higher efficiency at medium-to-high loads due to lower switching losses, while TPS62231DRVR provides smaller footprint and simpler layout at reduced current capability-making LM2734YMK optimal for 1-A, thermally constrained, cost-sensitive buck applications requiring proven reliability.
Availability
LM2734YMK is available at Aetrix Electronics and suitable for USB-powered devices, notebook computers, battery-powered instruments, DSL modems, and set-top boxes requiring stable component supply and long-term production continuity.
Supply support for LM2734YMK 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 ICs, with decades of expertise in high-reliability DC/DC conversion.
The LM2734 product line delivers compact, high-frequency buck regulators targeting space-constrained point-of-load applications where thermal performance, efficiency, and design simplicity are critical.
FAQ
What is the recommended input capacitor value for LM2734YMK?
A 10-µF, 6.3-V X5R ceramic capacitor placed close to the VIN and GND pins is recommended for LM2734YMK to suppress high-frequency switching noise and stabilize the input rail. This value balances ESR, size, and effectiveness across the 3–20-V input range and 550-kHz operation. Larger values may improve hold-up time but offer diminishing returns for ripple suppression.
Does LM2734YMK require an external catch diode?
Yes, LM2734YMK requires an external Schottky catch diode (e.g., MBRM110L) connected between SW and GND. Because it uses an N-channel MOSFET with asynchronous rectification, the diode provides the return path for inductor current during the switch off-time. Omitting it will cause catastrophic failure due to unclamped inductive kickback at the SW pin.
Can LM2734YMK operate with a 2.5-V input voltage?
No, LM2734YMK cannot operate reliably at 2.5-V input. Its undervoltage lockout activates below 2.74 V (typical), and the device will remain disabled until VIN rises above this threshold. Operation below 3 V violates the Recommended Operating Conditions and risks unstable regulation or startup failure.
How does the BOOST capacitor function in LM2734YMK?
The BOOST capacitor in LM2734YMK forms a charge pump with the internal NMOS gate driver and external boost diode to generate a gate-drive voltage ≥2.5 V above the SW node. During the off-time, VIN charges the capacitor through the diode; during on-time, the capacitor supplies gate current to fully enhance the 300-mΩ NMOS switch, ensuring low RDS(ON) conduction losses.
Is LM2734YMK RoHS-compliant and lead-free?
Yes, LM2734YMK is RoHS-compliant and lead-free per Texas Instruments' packaging standards. The Thin SOT-23-6 (DDC) package uses matte-tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1), enabling standard reflow soldering without special handling requirements.
LM2734YMK 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:
- 550kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
LM2734YMK FAQ
1.How can I place an order for LM2734YMK through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2734YMK 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 LM2734YMK reliable?
The price and inventory of LM2734YMK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2734YMK is usually 5 days.
3.What payment methods are accepted for LM2734YMK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2734YMK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2734YMK?
LM2734YMK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2734YMK 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 LM2734YMK?
For technical support, including LM2734YMK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2734YMK requirements.
6.How does Aetrix verify that LM2734YMK is sourced from the original manufacturer or authorized distributors?
All LM2734YMK 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 LM2734YMK meets industry standards.
7.What is the process for return or replacement of LM2734YMK?
All LM2734YMK units undergo pre-shipment inspection (PSI). If there is an issue with LM2734YMK, 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 LM2734YMK part is unused and in its original packaging.
Return procedure for LM2734YMK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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