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Texas Instruments LM2734YQMKE/NOPB
- Part No.:
- LM2734YQMKE/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2734YQMKE/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:245
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Product details
Overview
LM2734YQMKE/NOPB from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified, current-mode PWM step-down DC/DC regulator in a 6-pin Thin SOT-23 package. It delivers 1-A output current with 550-kHz fixed switching frequency, 0.8-V internal reference (±2%), and 300-mΩ NMOS switch, enabling compact point-of-load regulation in ADAS and infotainment systems.
For engineers reviewing the LM2734YQMKE/NOPB datasheet, LM2734YQMKE/NOPB pinout, LM2734YQMKE/NOPB application, or LM2734YQMKE/NOPB equivalent, key selection criteria include input voltage range (3–20 V), thermal shutdown behavior, 30-nA shutdown current, and internal soft-start timing - all critical for automotive power rail stability and EMI-constrained layouts.
Technical Context
The LM2734YQMKE/NOPB implements constant-frequency current-mode control with internal compensation, supporting fast transient response and stable regulation across 3–20 V input and 0.8–18 V output ranges. Its 13-ns minimum on-time enables high duty-cycle operation down to 0.8 V output even at 20 V input.
It integrates undervoltage lockout (UVLO) with 2.74 V turn-on threshold and 440 mV hysteresis, cycle-by-cycle current limiting (1.7 A typical), and output overvoltage protection triggered at 10% above VFB. The BOOST pin drives the internal NMOS gate via external bootstrap capacitor, requiring VBOOST–VSW ≥ 2.5 V for full 1-A capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 550 kHz - enables use of small 4.7 µH inductors and ceramic output capacitors; reduces solution footprint vs lower-frequency buck regulators. |
| Output Current | 1 A continuous - supports local power delivery for microcontrollers, sensors, and camera modules in automotive ECUs. |
| Input Voltage Range | 3 V to 20 V - accommodates cold-crank (≥4.5 V) and load-dump (≤18 V) conditions per ISO 16750-2 without external pre-regulation. |
| Feedback Reference | 0.8 V ±2% - sets output voltage via resistor divider; enables precise 1.2 V, 1.8 V, 3.3 V, or 5 V rails with <±1% total error including line/load regulation. |
| Shutdown Current | 30 nA - minimizes battery drain during vehicle sleep mode; meets automotive quiescent current requirements for always-on domains. |
| Internal NMOS RDS(on) | 300 mΩ (typical) - limits conduction loss at 1 A; contributes to >90% peak efficiency at 5 VIN/3.3 VOUT. |
| Thermal Shutdown | 165°C junction - protects against sustained overload or poor PCB thermal design; auto-recovery at ~150°C prevents latch-up. |
Pinout & Package
LM2734YQMKE/NOPB uses the DDC (Thin SOT-23-6) package: 2.90 mm × 1.60 mm body, 0.95 mm max height, gull-wing leads. Thermal pad is not present; PCB copper area under device improves θJA (158.1°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pin 1) | Bootstrap supply | Drives NMOS gate during high-side switch conduction; requires 0.01 µF ceramic capacitor to SW to sustain ≥2.5 V gate overdrive. |
| GND (Pin 2) | Signal & power ground | Reference for FB, EN, and internal circuits; feedback resistor bottom leg must connect here to minimize sensing error. |
| FB (Pin 3) | Voltage feedback input | Compares divided output voltage to 0.8 V reference; open-drain bias current ≤250 nA enables high-resistor-divider designs. |
| EN (Pin 4) | Enable control | Logic-high (>1.8 V) enables regulation; logic-low (<0.4 V) forces 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 X5R ceramic bypass capacitor near pin to suppress switching noise and input ripple. |
| SW (Pin 6) | Switch node | Connects to inductor, catch diode cathode, and BOOST capacitor; carries high di/dt; layout must minimize loop area for EMI control. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 (−40°C to +125°C TA) - validated for engine bay and cabin-mounted ADAS modules without derating. |
| Internal soft-start | ~200 µs VOUT ramp - limits inrush current into large output capacitance; eliminates need for external soft-start circuitry. |
| Current-mode control | Single-loop stability with no external compensation - simplifies design and improves load-transient response vs voltage-mode alternatives. |
| Output overvoltage protection | Triggers at FB = 1.1×VREF (0.88 V) - disables switch to prevent damage to downstream 3.3 V or 1.8 V ICs during feedback divider fault. |
| Undervoltage lockout | 2.74 V turn-on / 2.3 V turn-off - prevents erratic startup during battery recovery and ensures clean power sequencing. |
Applications
| Advanced Driver Assistance Systems (ADAS) | Automotive Infotainment |
|---|---|
Use Scenario: Powering radar SoC core voltage (1.0 V) and I/O rail (1.8 V) in 77-GHz front-end modules. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering clean, low-noise 1-A supply with fast transient response to handle burst-mode processing. Use Value: 550-kHz switching avoids AM band interference; 30-nA shutdown preserves battery during parking mode; AEC-Q100 Grade 1 ensures reliability at 125°C ambient. |
Use Scenario: Generating 3.3 V for touch controller and display interface in head-unit mainboard. IC Role / Device Role / Timing Role: Secondary buck converter stepping down 5 V USB-PD or 12 V system rail to low-voltage logic supply. Use Value: Internal 300-mΩ switch eliminates external MOSFET; thin SOT-23 footprint saves space in dense multi-rail layouts; thermal shutdown prevents field failures under prolonged video load. |
| Body Control Modules (BCM) | Telematics Control Units (TCU) |
Use Scenario: Supplying 5 V to LIN transceivers and CAN FD controllers in door module ECUs. IC Role / Device Role / Timing Role: Local regulator converting 12 V battery to isolated 5 V domain with UVLO hysteresis for robust cold-crank operation. Use Value: 3–20 V input range covers full automotive battery profile; 440 mV UVLO hysteresis prevents oscillation during slow battery rise; 6-pin SOT-23 eases automated assembly. |
Use Scenario: Providing 1.2 V core voltage to cellular modem SoC in connected vehicle gateway. IC Role / Device Role / Timing Role: High-efficiency buck stage feeding processor core, with soft-start preventing reset glitches during modem boot. Use Value: 0.8 V reference enables accurate 1.2 V output via 1% resistors; 13 ns min on-time supports 1.2 V out at 12 V in; WEBENCH®-supported for rapid validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2734XQMKE/NOPB | 1.6 MHz switching frequency; higher RDS(on) (600 mΩ max); reduced max duty cycle (85%) | Better suited for ultra-compact layouts needing smallest inductors; less efficient at high VIN/VOUT ratios | Select when board space is constrained and 1.6 MHz EMI filtering is acceptable; verify thermal performance at 1 A. |
| TPS62130ARGTR | 3–17 V input; 3-MHz fixed frequency; 1.2-A output; integrated synchronous rectifier; 17-µA quiescent current | Higher efficiency due to sync rectification; wider VIN range excludes 18–20 V load-dump scenarios | Prefer for non-automotive industrial apps or where >95% efficiency at light load is critical; lacks AEC-Q100 qualification. |
Compared with LM2734YQMKE/NOPB, LM2734XQMKE/NOPB trades lower conduction loss for higher switching loss and reduced max duty cycle, while TPS62130ARGTR offers superior light-load efficiency and smaller solution size but omits automotive qualification and 20-V input tolerance.
Availability
LM2734YQMKE/NOPB is available at Aetrix Electronics and suitable for automotive ADAS, infotainment, and telematics applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LM2734YQMKE/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 leader designing analog and embedded processing solutions for automotive, industrial, and personal electronics markets.
The LM2734YQMKE/NOPB belongs to TI's automotive-grade DC/DC buck regulator family, engineered specifically for high-reliability, space-constrained point-of-load conversion in safety-critical vehicle subsystems.
FAQ
What is the maximum input voltage rating for LM2734YQMKE/NOPB?
The absolute maximum input voltage for LM2734YQMKE/NOPB is 24 V, but the recommended operating range is 3 V to 20 V per AEC-Q100 stress testing and automotive load-dump compliance. Operation above 20 V risks exceeding safe operating area limits during transients, even if within absolute max ratings.
Does LM2734YQMKE/NOPB require an external catch diode?
Yes, LM2734YQMKE/NOPB requires an external Schottky catch diode (e.g., MBRM110L) connected between SW and GND. Unlike synchronous buck converters, it uses an internal NMOS high-side switch only and relies on the external diode for low-side conduction during off-time.
How does the BOOST pin function in LM2734YQMKE/NOPB?
The BOOST pin on LM2734YQMKE/NOPB supplies gate drive voltage to the internal NMOS switch via an external bootstrap capacitor tied to SW. It must maintain VBOOST–VSW ≥ 2.5 V for full 1-A output capability; insufficient boost voltage increases RDS(on) and reduces efficiency or causes current limit triggering.
Is LM2734YQMKE/NOPB pin-compatible with LM2734XQMKE/NOPB?
Yes, LM2734YQMKE/NOPB and LM2734XQMKE/NOPB share identical DDC (Thin SOT-23-6) packaging, pinout, and footprint. They differ only in internal oscillator frequency (550 kHz vs 1.6 MHz) and associated parameters like max duty cycle and boost current - allowing direct substitution where frequency and duty-cycle constraints permit.
What thermal metrics apply to LM2734YQMKE/NOPB in its SOT-23-6 package?
LM2734YQMKE/NOPB in the DDC package has RθJA = 158.1°C/W (junction-to-ambient), RθJB = 29.5°C/W (junction-to-board), and ψJB = 29.2°C/W. These values assume standard JEDEC 2-layer board; adding 1-in² copper pour under the package reduces RθJA by ~30°C/W, critical for sustaining 1-A load at 125°C ambient.
LM2734YQMKE/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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LM2734YQMKE/NOPB FAQ
1.How can I place an order for LM2734YQMKE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2734YQMKE/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 LM2734YQMKE/NOPB reliable?
The price and inventory of LM2734YQMKE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2734YQMKE/NOPB is usually 5 days.
3.What payment methods are accepted for LM2734YQMKE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2734YQMKE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2734YQMKE/NOPB?
LM2734YQMKE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2734YQMKE/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 LM2734YQMKE/NOPB?
For technical support, including LM2734YQMKE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2734YQMKE/NOPB requirements.
6.How does Aetrix verify that LM2734YQMKE/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2734YQMKE/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 LM2734YQMKE/NOPB meets industry standards.
7.What is the process for return or replacement of LM2734YQMKE/NOPB?
All LM2734YQMKE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2734YQMKE/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 LM2734YQMKE/NOPB part is unused and in its original packaging.
Return procedure for LM2734YQMKE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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