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Texas Instruments LM2734ZMKX/NOPB
- Part No.:
- LM2734ZMKX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2734ZMKX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,934
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Product details
Overview
LM2734ZMKX/NOPB from Texas Instruments (formerly National Semiconductor) is a monolithic 3 MHz PWM step-down DC-DC regulator in a 6-pin Thin SOT-23 package, featuring an internal 300 mΩ NMOS switch, 1 A output current capability, 0.8 V to 18 V adjustable output voltage range, and 30 nA shutdown current. It delivers local point-of-load regulation for space-constrained battery- and USB-powered devices.
For engineers reviewing the LM2734ZMKX/NOPB datasheet, LM2734ZMKX/NOPB pinout, LM2734ZMKX/NOPB application, or LM2734ZMKX/NOPB equivalent, key selection criteria include its 3 MHz fixed switching frequency, internal current-mode control with no external compensation required, 0.8 V ±2% reference accuracy, thermal shutdown, and ultra-low quiescent current in shutdown mode.
Technical Context
The LM2734ZMKX/NOPB implements constant-frequency current-mode PWM control with internal compensation, enabling stable regulation across 3 V–20 V input and 0.8 V–18 V output ranges without external loop components. Its 13 ns minimum on-time supports high duty-cycle operation down to 0.8 V output even at 20 V input.
It integrates a 300 mΩ NMOS power switch, internal soft-start (200 µs ramp), pulse-by-pulse current limit (1.7 A typ), undervoltage lockout (2.9 V rising threshold), and output overvoltage protection (10% above VFB). The BOOST pin enables gate drive via external bootstrap capacitor, requiring VBOOST–VSW ≥ 2.5 V for optimal efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 3 MHz fixed - enables use of sub-3 mm × 3 mm inductors and ceramic capacitors, minimizing PCB area. |
| Input Voltage Range | 3.0 V to 20 V - supports wide-input applications including automotive transients and multi-cell battery systems. |
| Output Voltage Range | 0.8 V to 18 V - set by external resistor divider; 0.8 V ±2% internal reference ensures tight regulation at low voltages. |
| Max Output Current | 1 A continuous - delivered via integrated 300 mΩ NMOS switch; current limit protects against overload and short-circuit. |
| Shutdown Current | 30 nA typical - enables ultra-low-power standby in portable and always-on systems. |
| Thermal Shutdown | 165°C junction temperature - automatically disables switch until junction cools to ~150°C, preventing permanent damage. |
| Soft-Start Time | ~200 µs - linear ramp of internal reference reduces inrush current and prevents output overshoot during startup. |
Pinout & Package
LM2734ZMKX/NOPB is packaged in a 6-pin Thin SOT-23 (TSOT-6, NS Package Number MK06A) with exposed die attach pad (DAP) internally connected to GND. This thermally enhanced package supports high power density in minimal board area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BOOST | Bootstrap supply node | Drives NMOS gate; requires external 0.01 µF ceramic capacitor between BOOST and SW to sustain gate voltage during high-side conduction. |
| 2 - GND | Signal and power ground | Reference for feedback network and internal circuitry; DAP must be soldered to PCB ground plane for thermal performance. |
| 3 - FB | Feedback input | High-impedance (250 nA max bias) node sensing output voltage via resistor divider; trace must be short and noise-shielded. |
| 4 - EN | Enable control | 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. |
| 5 - VIN | Main input supply | Accepts 3–20 V; requires local 10 µF ceramic bypass capacitor with low ESL placed adjacent to pin. |
| 6 - SW | Switch node | Connects to inductor and catch diode anode; carries high di/dt; must be routed short and wide to minimize EMI and voltage spikes. |
Key Features
| Feature | Design Value |
|---|---|
| Internal current-mode PWM control | Eliminates need for external compensation components while maintaining stability across load, line, and temperature variations. |
| 3 MHz fixed switching frequency | Reduces required inductor size to <10 mm³ and enables full ceramic capacitor designs without compromising transient response. |
| 0.8 V ±2% internal voltage reference | Enables accurate 0.8 V output for modern low-voltage processors and FPGAs without trimming or calibration. |
| Pulse-by-pulse current limiting | Provides cycle-by-cycle protection at 1.7 A typical, preventing thermal runaway during output shorts or heavy transient loads. |
| Integrated soft-start | Ramps output voltage linearly over ~200 µs to prevent inrush current, reduce stress on input capacitors, and avoid false triggering of downstream UVLO. |
Applications
| DSL Modems | USB-Powered Devices |
|---|---|
Use Scenario: Powering PHY, DSP, and interface ICs in compact DSL modem designs with limited board area and strict thermal constraints. IC Role / Device Role / Timing Role: Primary point-of-load regulator converting 5 V USB or 12 V adapter input to 1.2 V, 1.8 V, or 3.3 V rails for digital baseband and analog front-end circuits. Use Value: 3 MHz operation allows use of 2.2 µH inductors and 10 µF X7R MLCCs, reducing solution footprint by >40% vs lower-frequency alternatives. | Use Scenario: Providing regulated 3.3 V or 5 V power to microcontrollers, sensors, and USB peripherals in bus-powered hubs, dongles, and portable accessories. IC Role / Device Role / Timing Role: Standalone buck converter replacing linear regulators to improve efficiency and eliminate thermal derating in sealed enclosures. Use Value: 30 nA shutdown current extends battery life in sleep modes; internal soft-start prevents USB port overcurrent faults during plug-in events. |
| Battery-Powered Devices | Automotive Infotainment |
Use Scenario: Supplying core voltage to ARM Cortex-M microcontrollers and RF transceivers in handheld medical monitors, wireless sensors, and portable test equipment. IC Role / Device Role / Timing Role: Main system regulator stepping down single-cell Li-ion (3.0–4.2 V) or dual-cell alkaline (3–6 V) input to 1.8 V or 3.3 V logic rails. Use Value: Wide 3–20 V input range accommodates battery voltage sag and boost-derived inputs; 85% peak efficiency minimizes heat generation in plastic housings. | Use Scenario: Generating 5 V or 3.3 V supplies for display controllers, audio codecs, and CAN transceivers in automotive head units and telematics modules. IC Role / Device Role / Timing Role: Secondary regulator fed from 12 V vehicle battery (with transient protection), delivering clean, low-noise power under cold-crank and load-dump conditions. Use Value: Undervoltage lockout (2.9 V enable, 2.3 V disable) prevents erratic behavior during cranking; thermal shutdown protects against sustained high-ambient under-dash operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC-DC regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 2.25 MHz switching frequency, 0.6 V reference, 0.95 Ω switch RDS(ON), 1.8 µA quiescent current (active) | Optimized for ultra-low-IQ battery apps; lacks 30 nA shutdown and 3 MHz speed | Prefer LM2734ZMKX/NOPB when board area is critical and 3 MHz enables smaller passives. |
| MP2104DJ-LF-Z | 1.5 MHz switching frequency, 1.25 V reference, 0.35 Ω switch RDS(ON), 25 µA quiescent current (active) | Lower cost; no internal soft-start or OVP; requires external compensation | Prefer LM2734ZMKX/NOPB when design requires guaranteed stability, fast transient response, and integrated protection features. |
Compared with TPS62231DRYR and MP2104DJ-LF-Z, the LM2734ZMKX/NOPB offers superior power density via 3 MHz operation, tighter 0.8 V reference accuracy, and fully integrated protection (OVP, thermal shutdown, soft-start), making it ideal for space-constrained, high-reliability point-of-load designs where passive count and layout simplicity are prioritized.
Availability
LM2734ZMKX/NOPB is available at Aetrix Electronics and suitable for DSL modems, USB-powered devices, and battery-powered instrumentation requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2734ZMKX/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 acquired National Semiconductor in 2011 and maintains its legacy analog and power management portfolio with full datasheet, simulation, and design tool support.
The LM2734Z series belongs to TI's high-frequency monolithic buck regulator product line, engineered specifically for compact, efficient point-of-load conversion in consumer, industrial, and automotive applications where minimal external components and small PCB footprint are essential.
FAQ
What is the recommended inductor value for LM2734ZMKX/NOPB in a 5 V to 3.3 V, 1 A application?
For LM2734ZMKX/NOPB operating at 3 MHz with 5 V input and 3.3 V output delivering 1 A, a 2.2 µH shielded ferrite inductor rated for ≥1.25 A saturation current is recommended. This value balances ripple current (~0.4 A peak-to-peak), size, and efficiency-verified in TI's reference design SNVA247. Lower values increase ripple; higher values reduce ripple but increase physical size and may degrade transient response.
Does LM2734ZMKX/NOPB require external compensation components?
No, LM2734ZMKX/NOPB uses internal compensation with current-mode control architecture, eliminating the need for external compensation networks. This simplifies design, reduces BOM count, and guarantees stability across the full 3 V–20 V input range and 0.8 V–18 V output range without tuning. Layout best practices-especially short FB trace and proper grounding-remain essential for optimal performance.
Can LM2734ZMKX/NOPB operate with input voltage below 3 V?
No, LM2734ZMKX/NOPB has a specified minimum input voltage of 3 V per Absolute Maximum and Operating Ratings. Below 3 V, undervoltage lockout prevents operation-rising threshold is 2.9 V typ, falling threshold is 2.3 V typ. Attempting operation below 3 V risks failure to start or unstable regulation; for sub-3 V inputs, consider TI's TPS6223x or TPS6282x families instead.
What is the purpose of the BOOST pin on LM2734ZMKX/NOPB, and how is it configured?
The BOOST pin on LM2734ZMKX/NOPB supplies gate drive voltage to the internal NMOS switch. It must be biased 2.5–5.5 V above the SW pin using a 0.01 µF ceramic capacitor connected between BOOST and SW. During switch off-time, the capacitor charges from VIN (or VOUT); during on-time, it floats to ~2×VIN – 0.4 V, sustaining sufficient gate overdrive. Incorrect BOOST voltage causes reduced efficiency or current limit foldback.
Is LM2734ZMKX/NOPB qualified for automotive applications?
No-LM2734ZMKX/NOPB is the commercial-grade variant. The automotive-qualified version is LM2734ZQMKX/NOPB (AEC-Q100 Grade 1), which undergoes enhanced manufacturing, extended temperature validation (−40°C to +125°C), and automotive-specific reliability testing. LM2734ZMKX/NOPB is rated for −40°C to +125°C junction temperature but lacks AEC-Q100 certification and automotive flow documentation.
LM2734ZMKX/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:
- 3MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
LM2734ZMKX/NOPB FAQ
1.How can I place an order for LM2734ZMKX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2734ZMKX/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 LM2734ZMKX/NOPB reliable?
The price and inventory of LM2734ZMKX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2734ZMKX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2734ZMKX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2734ZMKX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2734ZMKX/NOPB?
LM2734ZMKX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2734ZMKX/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 LM2734ZMKX/NOPB?
For technical support, including LM2734ZMKX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2734ZMKX/NOPB requirements.
6.How does Aetrix verify that LM2734ZMKX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2734ZMKX/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 LM2734ZMKX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2734ZMKX/NOPB?
All LM2734ZMKX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2734ZMKX/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 LM2734ZMKX/NOPB part is unused and in its original packaging.
Return procedure for LM2734ZMKX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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