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Texas Instruments LM2734ZQMKX/NOPB
- Part No.:
- LM2734ZQMKX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2734ZQMKX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,696
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Product details
Overview
LM2734ZQMKX/NOPB from Texas Instruments (formerly National Semiconductor) is an AEC-Q100 Grade 1 qualified monolithic 3 MHz PWM step-down DC-DC regulator in a 6-pin Thin SOT-23 package, delivering 1A output current with 300 mΩ internal NMOS switch, 0.8 V ±2% reference, and 30 nA shutdown current for automotive point-of-load regulation.
For engineers reviewing the LM2734ZQMKX/NOPB datasheet, LM2734ZQMKX/NOPB pinout, LM2734ZQMKX/NOPB application, or LM2734ZQMKX/NOPB equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade operating range (−40°C to +125°C), real-world efficiency data at 3.3 V/1 A, and two documented alternative regulators with explicit functional and qualification differences.
Technical Context
The LM2734ZQMKX/NOPB implements fixed-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 thermal shutdown (trip at 165°C, restart at ~150°C), pulse-by-pulse current limiting (1.2 A min, 1.7 A typ), undervoltage lockout (2.74 V rising, 2.3 V falling), and output overvoltage protection (FB > 1.1 × VREF). The BOOST pin requires ≥2.5 V above SW for optimal gate drive, with strict 5.5 V absolute max differential.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 3 MHz (fixed, enables use of ≤2.2 µH inductors and chip-scale ceramic capacitors) |
| Output Current | 1 A continuous (supported by internal 300 mΩ NMOS switch in TSOT-6 package) |
| Input Voltage Range | 3.0 V to 20 V (with UVLO hysteresis ensuring clean startup/shutdown) |
| Output Voltage Range | 0.8 V to 18 V (set via external resistor divider; 0.8 V reference accurate to ±2%) |
| Shutdown Current | 30 nA (ultra-low quiescent draw preserves battery life in always-on automotive modules) |
| Junction Temp Range | −40°C to +125°C (AEC-Q100 Grade 1 qualified for under-hood automotive applications) |
| Thermal Resistance θJA | 118°C/W (measured on 3″ × 3″ 4-layer PCB with 2 oz copper; dictates heatsinking requirements) |
Pinout & Package
LM2734ZQMKX/NOPB uses the NS Package Number MK06A - a 6-pin Thin SOT-23 (TSOT-6) package with exposed die attach pad (DAP) internally connected to GND. Package dimensions: 2.9 mm × 1.6 mm × 0.8 mm, lead pitch 0.95 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BOOST | Bootstrap supply node | Drives NMOS gate; requires 0.01 µF ceramic capacitor to SW; must maintain ≥2.5 V above SW for full 1 A capability |
| 2 - GND | Signal and power ground | Reference for FB, EN, and internal circuits; bottom resistor of feedback divider must connect here for accuracy |
| 3 - FB | Feedback input | High-impedance (≤250 nA bias) node monitoring output via resistor divider; triggers OVP if >0.88 V |
| 4 - EN | Enable control | Logic-high active; threshold 1.8 V (rising), 0.4 V (falling); floating prohibited; max voltage = VIN + 0.3 V |
| 5 - VIN | Main input supply | Accepts 3–20 V; requires local 10 µF ceramic bypass capacitor near pin; absolute max = 24 V |
| 6 - SW | Switch node | Connects to inductor, catch diode cathode, and BOOST capacitor; swings from ~0 V to VIN during operation |
| DAP | Die Attach Pad | Internally tied to GND; must be soldered to PCB ground plane for thermal and electrical performance |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive applications with guaranteed −40°C to +125°C operation and enhanced manufacturing flow |
| Internal soft-start | Ramps reference from 0 V to 0.8 V over ~200 µs, limiting inrush current during power-up |
| 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 external MOSFET; reduces BOM count and layout area while maintaining 85% peak efficiency at 3.3 V/1 A |
| Output overvoltage protection | Disables SW when FB exceeds 1.1 × VREF (0.88 V), safeguarding downstream 3.3 V or 2.5 V logic rails |
Applications
| Automotive Infotainment Power | USB-C PD Sink Regulation |
|---|---|
Use Scenario: Local 3.3 V rail generation for AM/FM tuner ICs and display controllers in vehicle head units. IC Role / Device Role / Timing Role: Primary buck regulator supplying 1 A at 3.3 V from 12 V battery rail with AEC-Q100 compliance. Use Value: Enables compact, thermally robust design meeting automotive temperature and reliability requirements without external current-sense or compensation components. | Use Scenario: Step-down conversion from USB-C PD's 9 V or 15 V profile to regulated 5 V/1 A for portable accessories. IC Role / Device Role / Timing Role: High-frequency (3 MHz) buck converter minimizing inductor size and EMI in space-constrained portable enclosures. Use Value: Achieves >82% efficiency at 5 V/1 A with <2.2 µH inductor and ceramic caps, reducing solution footprint by >40% vs lower-frequency alternatives. |
| DSL Modem Point-of-Load | Industrial Sensor Node Supply |
Use Scenario: Generating stable 1.8 V or 2.5 V for ADSL line drivers and PHY ICs in broadband access equipment. IC Role / Device Role / Timing Role: Local DC/DC regulator handling dynamic load steps up to 1 A with <10 µs transient recovery. Use Value: Internal current-mode control and 3 MHz switching deliver fast load-step response and minimal output voltage deviation (<±30 mV). | Use Scenario: Powering low-power microcontrollers and analog sensors in battery-operated IIoT nodes requiring long standby life. IC Role / Device Role / Timing Role: Always-on buck regulator with 30 nA shutdown current and −40°C start-up capability. Use Value: Extends battery runtime by >3× vs comparable regulators; maintains regulation during cold-cranking events down to −40°C. |
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 |
|---|---|---|---|
| TPS62130ARGTR | 3 MHz sync buck, 3–17 V input, 1.2 A, 12 µA IQ (active), no AEC-Q100 grade | Consumer/portable; lacks automotive qualification and ultra-low shutdown current | Preferred where board space is critical and automotive qualification is not required |
| LMQ66430QRNXTQ1 | 2.7–36 V input, 3 A, 2.1 MHz, AEC-Q100 Grade 1, integrated FETs, 26 µA IQ (active) | Higher current, wider VIN, but larger 16-pin QFN; no 30 nA shutdown mode | Best for next-gen automotive systems needing >1 A or >20 V input tolerance |
Compared with LM2734ZQMKX/NOPB, TPS62130ARGTR offers lower active IQ but no automotive qualification or 30 nA shutdown, while LMQ66430QRNXTQ1 provides higher current and input range with AEC-Q100 Grade 1 but sacrifices ultra-low shutdown current and increases package size-making LM2734ZQMKX/NOPB optimal for cost-sensitive, space-constrained 1 A automotive PoL designs.
Availability
LM2734ZQMKX/NOPB is available at Aetrix Electronics and suitable for automotive infotainment systems, DSL modem power supplies, and industrial sensor nodes requiring stable component supply with AEC-Q100 compliance and −40°C to +125°C operation.
Supply support for LM2734ZQMKX/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 WEBENCH® design support.
The LM2734ZQMKX/NOPB belongs to TI's automotive-qualified DC-DC buck regulator family, engineered specifically for compact, high-frequency point-of-load conversion in harsh-temperature automotive environments.
FAQ
What is the maximum input voltage rating for LM2734ZQMKX/NOPB?
The absolute maximum input voltage for LM2734ZQMKX/NOPB is 24 V, though the recommended operating range is 3 V to 20 V. Exceeding 20 V risks triggering undervoltage lockout hysteresis instability or violating boost voltage limits. Operation at 24 V is only permissible for short transients and must remain within the absolute max ratings specified in the datasheet.
Does LM2734ZQMKX/NOPB require an external catch diode?
Yes, LM2734ZQMKX/NOPB requires an external Schottky catch diode (e.g., BAT54 or equivalent) connected between SW and GND. The IC contains only an internal NMOS switch and does not integrate synchronous rectification. Diode selection must ensure forward voltage <0.7 V and reverse breakdown >24 V to handle worst-case input transients.
What is the purpose of the BOOST pin on LM2734ZQMKX/NOPB?
On LM2734ZQMKX/NOPB, the BOOST pin supplies gate drive voltage to the internal NMOS switch via a bootstrap capacitor connected to SW. It must be maintained ≥2.5 V above SW for full 1 A output capability; operation below 1.6 V risks insufficient gate drive and thermal overload. A 0.01 µF X7R ceramic capacitor is mandatory between BOOST and SW.
Is LM2734ZQMKX/NOPB pin-compatible with LM2734ZMKX/NOPB?
Yes, LM2734ZQMKX/NOPB is pin-compatible with LM2734ZMKX/NOPB - both use identical TSOT-6 (MK06A) packaging and share identical pinout, electrical characteristics, and functional behavior. The "Q" suffix denotes AEC-Q100 Grade 1 qualification and automotive-grade manufacturing flow, with no physical or electrical interface changes.
What is the typical efficiency of LM2734ZQMKX/NOPB at 5 V input and 3.3 V/1 A output?
LM2734ZQMKX/NOPB achieves approximately 85% peak efficiency at 5 V input and 3.3 V/1 A output, per published efficiency curves. Measured data shows 82–84% across the 0.5–1.0 A load range under standard 4-layer PCB conditions with 2.2 µH inductor and ceramic input/output capacitors.
LM2734ZQMKX/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:
- 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:
- 3MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LM2734ZQMKX/NOPB FAQ
1.How can I place an order for LM2734ZQMKX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2734ZQMKX/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 LM2734ZQMKX/NOPB reliable?
The price and inventory of LM2734ZQMKX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2734ZQMKX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2734ZQMKX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2734ZQMKX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2734ZQMKX/NOPB?
LM2734ZQMKX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2734ZQMKX/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 LM2734ZQMKX/NOPB?
For technical support, including LM2734ZQMKX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2734ZQMKX/NOPB requirements.
6.How does Aetrix verify that LM2734ZQMKX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2734ZQMKX/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 LM2734ZQMKX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2734ZQMKX/NOPB?
All LM2734ZQMKX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2734ZQMKX/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 LM2734ZQMKX/NOPB part is unused and in its original packaging.
Return procedure for LM2734ZQMKX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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