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Texas Instruments LM2734ZQMK/NOPB
- Part No.:
- LM2734ZQMK/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2734ZQMK/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,510
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Product details
Overview
LM2734ZQMK/NOPB from Texas Instruments (formerly National Semiconductor) is an automotive-grade, monolithic 3MHz PWM step-down DC-DC regulator in a 6-pin Thin SOT-23 package. It delivers 1A output current with internal 300mΩ NMOS switch, 0.8V ±2% reference, and 30nA shutdown current - designed for space-constrained point-of-load regulation in automotive infotainment and ADAS modules.
For engineers reviewing the LM2734ZQMK/NOPB datasheet, LM2734ZQMK/NOPB pinout, LM2734ZQMK/NOPB application, or LM2734ZQMK/NOPB equivalent, key selection criteria include AEC-Q100 Grade 1 qualification, 3.0–20V input range, 0.8–18V adjustable output, thermal shutdown, and current-mode control for fast transient response in battery-powered and USB-powered systems.
Technical Context
The LM2734ZQMK/NOPB employs fixed-frequency current-mode PWM control with internal compensation, enabling stable regulation across wide load and line variations without external loop components. Its 13ns minimum on-time supports high duty-cycle operation down to 0.8V output even at 20V input.
It integrates soft-start (200µs ramp), cycle-by-cycle current limit (1.7A typ), output overvoltage protection (10% above VFB), and undervoltage lockout (2.9V rising threshold with 440mV hysteresis) - all operating within −40°C to +125°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 3 MHz fixed - enables use of sub-3mm ceramic inductors and compact PCB layout |
| Input Voltage Range | 3.0 V to 20 V - supports 12V automotive battery rails and wide-input industrial supplies |
| Output Voltage Range | 0.8 V to 18 V - programmable via resistor divider; 0.8 V reference enables low-voltage core rail generation |
| Max Output Current | 1 A continuous - sustained under full thermal limits with proper board thermal design |
| Internal Switch RDS(ON) | 300 mΩ (TSOT-6) - determines conduction loss; enables >85% efficiency at 5V→3.3V/1A |
| Shutdown Current | 30 nA - preserves battery life in always-on automotive modules during sleep mode |
| Feedback Reference | 0.800 V ±2% - sets output accuracy; defines regulation tolerance for downstream logic |
| Junction Temp Range | −40°C to +125°C - meets AEC-Q100 Grade 1 ambient requirements for under-hood applications |
Pinout & Package
LM2734ZQMK/NOPB is packaged in a 6-pin Thin SOT-23 (TSOT-6, NS Package MK06A) with exposed die attach pad (DAP) internally connected to GND. The package supports high-density placement and efficient thermal transfer via DAP soldering to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BOOST | Bootstrap gate-drive supply | Connects to SW via 0.01 µF ceramic capacitor; provides >2.5V gate overdrive for NMOS switch during on-time |
| 2 - GND | Signal and power ground | Reference for feedback network and thermal path; tie bottom resistor of FB divider directly here |
| 3 - FB | Voltage feedback input | High-impedance node (250 nA bias); senses output via resistor divider to regulate VOUT = 0.8V × (1 + R1/R2) |
| 4 - EN | Enable control input | Logic-high (>1.8 V) enables regulation; logic-low (<0.4 V) enters 30 nA shutdown - no floating allowed |
| 5 - VIN | Main input supply | Accepts 3–20 V; requires local 10 µF ceramic bypass capacitor near pin to suppress switching transients |
| 6 - SW | Switch node output | Drives external inductor and catch diode; swings between ~0 V (off) and VIN – IOUT×RDS(ON) (on) |
| DAP | Die Attach Pad | Internally tied to GND; must be soldered to PCB thermal pad for θJA = 118°C/W performance |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive use up to +125°C junction; includes enhanced manufacturing controls and defect screening |
| 3 MHz fixed switching frequency | Enables <3 mm × 3 mm total solution size with 2.2 µH inductor and 10 µF ceramic capacitors |
| Internal soft-start (200 µs) | Prevents inrush current into output capacitance; ensures monotonic VOUT ramp during cold start |
| Current-mode PWM control | Provides inherent cycle-by-cycle current limiting and fast transient response without external compensation |
| Thermal shutdown & OVP | Shuts down at 165°C junction; disables switch if FB exceeds 10% above 0.8V - protects downstream loads |
| Ultra-low shutdown current | 30 nA quiescent draw allows >10-year battery hold-up in always-on vehicle modules |
Applications
| Automotive Infotainment Power | USB-C PD Sink Regulation |
|---|---|
Use Scenario: Supplies 3.3V/1A to DSP, display controller, and audio codec in head unit with 12V battery input. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, low-noise local power with fast load-step response. Use Value: AEC-Q100 Grade 1 rating ensures reliability over temperature cycling; 3MHz operation minimizes EMI in RF-sensitive cabin environment. | Use Scenario: Regulates 5V USB power to 1.8V core rail for USB-C peripheral controller in portable diagnostic tool. IC Role / Device Role / Timing Role: Point-of-load converter stepping down USB VBUS with minimal board area and no external compensation. Use Value: Internal 300mΩ switch and 0.8V reference enable precise 1.8V output; 30nA shutdown extends battery runtime between measurements. |
| DSL Modem Line Card | Industrial Sensor Node |
Use Scenario: Generates 2.5V/1A for ADSL2+ PHY and microcontroller from 12V telecom supply in outdoor cabinet. IC Role / Device Role / Timing Role: High-efficiency DC-DC converter delivering stable rail despite wide input variation and temperature drift. Use Value: 3.0–20V input range accommodates brownout conditions; current-mode control maintains regulation during burst-mode data transmission. | Use Scenario: Powers ultra-low-power MCU and analog sensor interface from single Li-ion cell (3.0–4.2V) in predictive maintenance node. IC Role / Device Role / Timing Role: Step-down regulator enabling deep-sleep operation with 30nA shutdown and fast wake-up via EN pin. Use Value: 0.8V reference allows direct generation of 1.2V core voltage; thermal shutdown prevents failure during enclosure overheating. |
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 | 3MHz sync buck, 3–17V input, 1.2A, 12µA IQ (not shutdown), QFN-16 | Higher integration (integrated inductor option available), but larger footprint and no AEC-Q100 Grade 1 rating | Select for non-automotive industrial use where lower quiescent current and smaller solution size outweigh qualification needs |
| MP2451DT-LF-Z | 2MHz async buck, 3.3–36V input, 0.6A, 250mΩ switch, SOIC-8 | Wider input range and higher voltage tolerance, but lower current capability and no automotive qualification | Select when input exceeds 20V (e.g., 24V industrial bus) and 0.6A output suffices; verify thermal derating at full load |
Compared with TPS62130ARGTR and MP2451DT-LF-Z, LM2734ZQMK/NOPB uniquely combines AEC-Q100 Grade 1 qualification, 1A capability in TSOT-6, and 30nA shutdown - making it the only choice for space-constrained, battery-backed automotive modules requiring zero-power sleep states.
Availability
LM2734ZQMK/NOPB is available at Aetrix Electronics and suitable for automotive infotainment, DSL modems, and USB-powered devices requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LM2734ZQMK/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 power management portfolio with full technical and manufacturing continuity.
The LM2734ZQ series belongs to TI's automotive-qualified DC-DC buck regulator product line, engineered specifically for high-reliability, space-constrained point-of-load conversion in harsh-temperature environments.
FAQ
What is the AEC-Q100 qualification status of LM2734ZQMK/NOPB?
The LM2734ZQMK/NOPB is AEC-Q100 Grade 1 qualified, meaning it has been tested and certified for operation from −40°C to +125°C junction temperature with enhanced process controls specific to automotive production. This qualification applies to the LM2734ZQMK/NOPB variant only - standard LM2734ZMK parts lack this certification. TI documents this in the device's official datasheet revision history and packaging markings (SVBB).
Can LM2734ZQMK/NOPB operate with input voltage below 3.0V?
No - LM2734ZQMK/NOPB has a guaranteed operating input range of 3.0 V to 20 V per its Electrical Characteristics table. Undervoltage lockout activates below 2.9 V (typical rising threshold), and operation below 3.0 V is not characterized or supported. Attempting to operate LM2734ZQMK/NOPB at 2.8 V may result in unstable regulation or startup failure, especially at temperature extremes.
What is the recommended boost capacitor value and type for LM2734ZQMK/NOPB?
The recommended boost capacitor for LM2734ZQMK/NOPB is a 0.01 µF X7R or X5R multilayer ceramic capacitor rated for ≥6.3 V, placed directly between BOOST and SW pins. TI specifies this value in the "Boost Capacitor" section of the datasheet and confirms its sufficiency for gate drive under all load and input conditions. Larger values do not improve performance and may slow startup.
Does LM2734ZQMK/NOPB require external compensation components?
No - LM2734ZQMK/NOPB uses internal compensation and current-mode control architecture, eliminating the need for external compensation networks. The device achieves stable regulation across its full 0.8–18 V output range and 3.0–20 V input range with only five external components: input capacitor, output capacitor, inductor, feedback resistors, and boost capacitor. This simplifies design and reduces BOM count.
How does the thermal shutdown behavior work in LM2734ZQMK/NOPB?
LM2734ZQMK/NOPB initiates thermal shutdown when junction temperature exceeds 165°C, disabling the internal NMOS switch until temperature drops to approximately 150°C. This hysteresis prevents oscillation near the trip point. The shutdown is fully automatic and self-recovering - no external reset is needed. Thermal performance depends on PCB layout: θJA = 118°C/W assumes proper DAP grounding with ≥2 thermal vias to inner ground plane.
LM2734ZQMK/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
LM2734ZQMK/NOPB FAQ
1.How can I place an order for LM2734ZQMK/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2734ZQMK/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 LM2734ZQMK/NOPB reliable?
The price and inventory of LM2734ZQMK/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2734ZQMK/NOPB is usually 5 days.
3.What payment methods are accepted for LM2734ZQMK/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2734ZQMK/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2734ZQMK/NOPB?
LM2734ZQMK/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2734ZQMK/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 LM2734ZQMK/NOPB?
For technical support, including LM2734ZQMK/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2734ZQMK/NOPB requirements.
6.How does Aetrix verify that LM2734ZQMK/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2734ZQMK/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 LM2734ZQMK/NOPB meets industry standards.
7.What is the process for return or replacement of LM2734ZQMK/NOPB?
All LM2734ZQMK/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2734ZQMK/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 LM2734ZQMK/NOPB part is unused and in its original packaging.
Return procedure for LM2734ZQMK/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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