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Texas Instruments LM2734YMKX/NOPB
- Part No.:
- LM2734YMKX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2734YMKX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,365
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Product details
Overview
LM2734YMKX/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 550-kHz fixed switching frequency, 0.8-V internal reference (±2%), and 300-mΩ NMOS switch. It operates across 3-V to 20-V input and supports 0.8-V to 18-V adjustable output voltage for point-of-load power conversion in space-constrained USB-powered devices.
For engineers reviewing the LM2734YMKX/NOPB datasheet, LM2734YMKX/NOPB pinout, LM2734YMKX/NOPB application, or LM2734YMKX/NOPB equivalent, key selection criteria include verified 550-kHz operation (not 1.6 MHz), confirmed 30-nA shutdown current, thermal shutdown at 165°C, and validated use of external bootstrap capacitor between BOOST and SW pins.
Technical Context
The LM2734YMKX/NOPB implements constant-frequency current-mode control with internal compensation, enabling stable regulation without external loop components. Its 13-ns minimum on-time supports low-duty-cycle operation down to 0.8-V output across the full 3–20-V input range.
It integrates pulse-by-pulse current limiting (1.7-A typical), undervoltage lockout (2.74-V rising threshold with 440-mV hysteresis), and output overvoltage protection triggered at FB = 1.1×VREF. The BOOST pin supplies gate drive via external bootstrap capacitor, requiring VBOOST–VSW ≥ 1.6 V (recommended >2.5 V) and ≤5.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 550 kHz - enables use of compact 4.7-µH inductors and ceramic output capacitors without sacrificing transient response |
| Output Current | 1 A continuous - supports core rail requirements for HDDs, set-top boxes, and notebook subsystems |
| Input Voltage Range | 3 V to 20 V - accommodates wide-input industrial and battery-backed systems including 5-V USB and 12-V wall adapters |
| Feedback Reference | 0.8 V ±2% - sets output voltage via resistor divider; enables precise 1.5-V, 1.8-V, 3.3-V, or 5-V rails |
| Shutdown Current | 30 nA - ensures ultra-low standby power in battery-powered devices during sleep mode |
| Internal NMOS RDS(ON) | 300 mΩ - limits conduction loss at 1-A load; contributes to >90% peak efficiency at 5-VIN/3.3-VOUT |
| Thermal Shutdown | 165°C - protects device under overload or poor PCB thermal design; auto-recovery at ~150°C |
Pinout & Package
Package: SOT-23-THIN (DDC), 2.90 mm × 1.60 mm body size, 6-pin surface-mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pin 1) | Bootstrap supply input | Connects to external capacitor (CBOOST) and SW; provides gate drive voltage ≥1.6 V above SW for NMOS switch turn-on |
| GND (Pin 2) | Signal and power ground | Reference node for feedback divider; bottom resistor must be placed adjacent to minimize noise-induced regulation error |
| FB (Pin 3) | Voltage feedback input | Senses output via resistor divider; regulates output by comparing to 0.8-V internal reference |
| EN (Pin 4) | 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 |
| 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 from near-GND (during off-time) to VIN – ILOAD×RDS(ON) (during on-time) |
Key Features
| Feature | Design Value |
|---|---|
| Internal soft start | Ramps internal error amplifier reference from 0 V to 0.8 V in ~200 µs, limiting inrush current during startup |
| Current-mode PWM control | Enables fast transient response and inherent cycle-by-cycle current limiting without external slope compensation |
| Integrated 300-mΩ NMOS switch | Eliminates need for external high-side MOSFET; reduces BOM count and layout complexity in 1-A buck designs |
| Output overvoltage protection | Disables switch when FB exceeds 0.88 V (10% above 0.8-V reference), preventing damage to downstream loads |
| Thermal shutdown with hysteresis | Shuts down at 165°C junction temperature and resumes operation only after cooling to ~150°C, avoiding thermal oscillation |
Applications
| Local Point-of-Load Regulation | USB-Powered Devices |
|---|---|
Use Scenario: Regulating 5-V USB input to 1.8-V or 3.3-V for microcontroller I/O or memory interface in portable accessories. IC Role / Device Role / Timing Role: Primary buck converter providing tightly regulated, low-noise core voltage with fast load-step response. Use Value: Enables compact, single-chip solution with <2.9-mm width footprint and no external compensation required. | Use Scenario: Powering FPGA configuration logic or sensor interface circuitry in USB-C peripherals with strict 30-nA standby budget. IC Role / Device Role / Timing Role: Efficient step-down regulator with ultra-low shutdown current and internal soft-start for plug-and-play operation. Use Value: Meets USB Battery Charging v1.2 standby current requirements while maintaining 1-A delivery capability during active use. |
| Core Power in HDDs | Notebook Computers |
Use Scenario: Supplying 1.2-V or 1.5-V core voltage to HDD controller ASICs with dynamic load steps up to 1 A. IC Role / Device Role / Timing Role: High-frequency buck regulator delivering stable core rail with minimal output capacitance due to 550-kHz switching. Use Value: Achieves <1% output voltage deviation during 1-A load transients, supporting reliable SATA interface timing margins. | Use Scenario: Generating auxiliary 5-V or 3.3-V rails for display backlight drivers or USB hub controllers in thin-and-light notebooks. IC Role / Device Role / Timing Role: Compact, thermally robust DC/DC converter operating from main 12-V or 19-V battery bus. Use Value: Maintains >85% efficiency across 0.1–1-A load range and survives 158.1°C/W junction-to-ambient thermal resistance in constrained chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2734ZMKX/NOPB | Same 550-kHz frequency and SOT-23-THIN package; differs only in tape-and-reel packaging specification (NOPB vs ZMKX suffix denotes different reel orientation) | No functional difference; identical electrical performance and pinout | Select LM2734ZMKX/NOPB only if specific tape orientation or reel labeling is required by SMT line setup |
| TPS62231DRVR | 3-MHz switching frequency, 0.6-V reference, 0.65-μA quiescent current in PWM mode, but rated for only 0.6-A output current | Better suited for ultra-low-power, sub-600-mA applications where board area is more critical than output current | Choose TPS62231DRVR only when load current ≤600 mA and higher frequency allows smaller passive components |
Compared with LM2734YMKX/NOPB, LM2734ZMKX/NOPB offers identical regulation performance and thermal behavior but differs only in packaging logistics, whereas TPS62231DRVR trades 400-mA lower output current and different reference voltage for higher switching frequency and lower active quiescent current-making it unsuitable as a direct replacement for 1-A loads.
Availability
LM2734YMKX/NOPB is available at Aetrix Electronics and suitable for local point-of-load regulation, USB-powered devices, and notebook computer auxiliary rails requiring stable component supply, long-term manufacturability, and TI-qualified automotive-grade alternatives (SNVSB80 variant).
Supply support for LM2734YMKX/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 headquartered in Dallas, Texas, designing and manufacturing analog ICs, embedded processors, and power management solutions since 1930.
The LM2734 product line delivers high-frequency, internally compensated buck regulators targeting space-constrained, cost-sensitive applications such as consumer electronics, computing peripherals, and industrial controls where minimal external components and fast time-to-market are critical.
FAQ
What is the switching frequency of the LM2734YMKX/NOPB?
The LM2734YMKX/NOPB has a fixed internal switching frequency of 550 kHz, as designated by the "Y" suffix. This is distinct from the LM2734X variant (1.6 MHz). The 550-kHz frequency enables use of standard 4.7-µH inductors and supports high efficiency across the 3–20-V input range while maintaining fast transient response in the LM2734YMKX/NOPB.
Does the LM2734YMKX/NOPB require an external bootstrap capacitor?
Yes, the LM2734YMKX/NOPB requires an external ceramic capacitor (typically 0.01 µF X7R) connected between BOOST and SW pins to generate sufficient gate drive voltage for the internal NMOS switch. Without this capacitor, the device cannot achieve full 1-A output capability or maintain regulation under load, as confirmed in the LM2734YMKX/NOPB datasheet Section 8.1.1 and Figure 13.
What is the minimum output voltage supported by the LM2734YMKX/NOPB?
The LM2734YMKX/NOPB supports a minimum output voltage of 0.8 V, set by its internal precision 0.8-V ±2% voltage reference. Output voltage is adjusted using an external resistor divider connected to the FB pin; lowering R1/R2 ratio below the 0.8-V reference point is not supported, as the LM2734YMKX/NOPB lacks programmable reference or external reference input capability.
Can the LM2734YMKX/NOPB operate with a 2.5-V input voltage?
No, the LM2734YMKX/NOPB cannot reliably operate with a 2.5-V input. Its undervoltage lockout (UVLO) rising threshold is 2.74 V (typical), with 440-mV hysteresis, meaning it will not enable regulation until VIN exceeds ~2.74 V and will shut down if VIN falls below ~2.3 V. Operation at 2.5 V violates the recommended operating condition and risks unstable startup or dropout in the LM2734YMKX/NOPB.
What thermal metrics apply to the LM2734YMKX/NOPB in its SOT-23-THIN package?
The LM2734YMKX/NOPB in the DDC (SOT-23-THIN) package has a junction-to-ambient thermal resistance (RθJA) of 158.1°C/W, junction-to-board (RθJB) of 29.5°C/W, and junction-to-case (top) (RθJC(top)) of 46.5°C/W. These values assume JEDEC-standard PCB layout per datasheet Section 6.4; actual thermal performance depends on copper area, layer count, and airflow, and must be verified for each LM2734YMKX/NOPB implementation.
LM2734YMKX/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:
- 550kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
LM2734YMKX/NOPB FAQ
1.How can I place an order for LM2734YMKX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2734YMKX/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 LM2734YMKX/NOPB reliable?
The price and inventory of LM2734YMKX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2734YMKX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2734YMKX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2734YMKX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2734YMKX/NOPB?
LM2734YMKX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2734YMKX/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 LM2734YMKX/NOPB?
For technical support, including LM2734YMKX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2734YMKX/NOPB requirements.
6.How does Aetrix verify that LM2734YMKX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2734YMKX/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 LM2734YMKX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2734YMKX/NOPB?
All LM2734YMKX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2734YMKX/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 LM2734YMKX/NOPB part is unused and in its original packaging.
Return procedure for LM2734YMKX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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