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Texas Instruments LM2734YQMK/NOPB
- Part No.:
- LM2734YQMK/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2734YQMK/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,050
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Product details
Overview
LM2734YQMK/NOPB from Texas Instruments is an AEC-Q100 Grade 1 qualified 1-A synchronous step-down DC/DC regulator in a 6-pin Thin SOT-23 package, operating from 3 V to 20 V input and delivering 0.8 V to 18 V output with 550-kHz fixed switching frequency, 300-mΩ internal NMOS switch, and 0.8-V ±2% reference - used for point-of-load regulation in automotive ADAS modules.
For engineers reviewing the LM2734YQMK/NOPB datasheet, LM2734YQMK/NOPB pinout, LM2734YQMK/NOPB application, or LM2734YQMK/NOPB equivalent, key selection criteria include automotive-grade thermal performance (−40°C to +125°C), ultra-low 30-nA shutdown current, internal soft-start, current-mode PWM control, and compatibility with ceramic output capacitors and small-surface-mount inductors.
Technical Context
The LM2734YQMK/NOPB implements constant-frequency current-mode PWM control with internal compensation, enabling stable regulation across wide input/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 undervoltage lockout (2.74-V turn-on, 2.3-V turn-off with 440-mV hysteresis), cycle-by-cycle current limiting (1.7-A typical), thermal shutdown (165°C trip), and output overvoltage protection (FB > 1.08 V disables switch), all within a 2.90 mm × 1.60 mm Thin SOT-23-THIN (DDC) package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 20 V - supports direct connection to automotive battery rails including cold-crank transients. |
| Output Voltage Range | 0.8 V to 18 V - adjustable via external resistor divider; 0.8-V internal reference enables low-voltage core supply generation. |
| Switching Frequency | 550 kHz - enables use of compact 4.7-µH inductors and chip-scale ceramic capacitors without sacrificing transient response. |
| Max Output Current | 1 A - delivered continuously with internal 300-mΩ NMOS switch; no external MOSFET required. |
| Feedback Reference | 0.8 V ±2% - high-accuracy reference ensures tight output regulation across temperature and line variations. |
| Shutdown Current | 30 nA - enables ultra-low-power sleep modes in always-on automotive subsystems. |
| Operating Junction Temp | −40°C to +125°C - AEC-Q100 Grade 1 qualification confirms suitability for under-hood and ADAS ECU environments. |
Pinout & Package
Package: Thin SOT-23-THIN (DDC), 6-pin, 2.90 mm × 1.60 mm body size, exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pin 1) | Bootstrap supply input | Drives gate of internal NMOS; requires 0.01-µF ceramic capacitor between BOOST and SW to sustain ≥2.5-V gate drive above SW during on-time. |
| GND (Pin 2) | Signal and power ground | Common return for feedback network and power path; bottom resistor of FB divider must connect directly here for accuracy. |
| FB (Pin 3) | Feedback input | Senses output voltage via resistor divider; internal 0.8-V reference compares against divider ratio to regulate VOUT. |
| EN (Pin 4) | Enable control input | 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 ceramic bypass capacitor placed adjacent to pin to suppress switching noise. |
| SW (Pin 6) | Switch node output | Connects to inductor, catch diode cathode, and BOOST capacitor; swings from GND to VIN − ILOAD×RDS(ON) during operation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive use from −40°C to +125°C junction temperature with full reliability testing. |
| Internal soft-start | Ramps reference voltage from 0 V to 0.8 V over ~200 µs to limit inrush current during power-up. |
| Current-mode PWM control | Provides inherent cycle-by-cycle current limiting and fast transient response without external compensation. |
| Integrated 300-mΩ NMOS switch | Eliminates need for external high-side FET and driver, reducing BOM count and PCB area in space-constrained modules. |
| Output overvoltage protection | Disables switch if FB exceeds 1.08 V (10% above 0.8-V reference), preventing damage to downstream loads. |
Applications
| Automotive Infotainment Power Supply | ADAS Camera Module Regulator |
|---|---|
Use Scenario: Powers SoC, DDR memory, and display interface in head-unit systems with wide input voltage range and thermal cycling. IC Role / Device Role / Timing Role: Primary buck regulator delivering 1.1-V core and 3.3-V I/O rails from 12-V battery with <100-µs load-step response. Use Value: AEC-Q100 qualification and −40°C to +125°C operation ensure uninterrupted function during engine start-stop and under-hood thermal stress. | Use Scenario: Supplies image sensor, ISP, and SerDes in forward-facing camera modules requiring low-noise, stable 1.8-V and 2.8-V rails. IC Role / Device Role / Timing Role: Point-of-load converter with internal soft-start and OVP protecting sensitive CMOS image sensors from overvoltage events. Use Value: 550-kHz switching enables small 2.0-mm × 1.6-mm inductors and 0402 ceramic caps, minimizing footprint in compact camera housings. |
| Body Control Module (BCM) Sub-Regulator | Telematics Unit DC/DC Stage |
Use Scenario: Generates 5-V auxiliary rail for CAN transceivers, LIN controllers, and sensor interfaces in distributed vehicle networks. IC Role / Device Role / Timing Role: Secondary regulator stepping down 12-V main bus to isolated 5-V domain with UVLO hysteresis preventing brownout oscillation. Use Value: 30-nA shutdown current extends battery life during vehicle sleep mode; 2.74-V UVLO ensures reliable startup after cold cranking. | Use Scenario: Provides clean 3.3-V supply for LTE/Wi-Fi modems and GNSS receivers in connected car telematics units. IC Role / Device Role / Timing Role: High-efficiency buck stage with ceramic-capable design minimizing EMI in RF-sensitive wireless subsystems. Use Value: Internal compensation and current-mode control deliver >90% efficiency at 500-mA load while maintaining stability with low-ESR MLCCs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2734XQMK/NOPB | 1.6-MHz switching frequency vs. 550-kHz; identical package, pinout, and feature set. | Better suited for ultra-compact layouts where smaller inductors (<2.2 µH) and reduced output capacitance are critical. | Select LM2734XQMK/NOPB when board space is constrained and higher-frequency operation is acceptable for EMI filtering. |
| TPS62130AQDGSRQ1 | 3-MHz fixed frequency, 95% efficiency, integrated sync rectifier, but larger 8-pin WSON package. | Higher efficiency and lower quiescent current (17 µA active), yet requires more PCB area and different layout. | Choose TPS62130AQDGSRQ1 when maximum efficiency and lowest active IQ outweigh footprint constraints. |
Compared with LM2734YQMK/NOPB, the LM2734XQMK/NOPB offers faster transient response and smaller magnetics at the cost of slightly higher switching losses, while the TPS62130AQDGSRQ1 delivers superior light-load efficiency and integrated synchronous rectification but demands re-layout due to different pin count and package.
Availability
LM2734YQMK/NOPB is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, body control units, telematics systems, and industrial embedded controllers requiring stable component supply across extended temperature ranges.
Supply support for LM2734YQMK/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 specializing in analog and embedded processing technologies, with leadership in power management ICs for automotive, industrial, and communications markets.
The LM2734YQMK/NOPB belongs to TI's automotive-qualified DC/DC buck regulator product line, designed specifically for high-reliability, space-constrained point-of-load applications in advanced driver assistance and vehicle networking systems.
FAQ
What is the recommended input capacitor value for LM2734YQMK/NOPB in automotive applications?
The recommended input capacitor for LM2734YQMK/NOPB is 10 µF X5R ceramic rated for ≥6.3 V, placed as close as possible to the VIN and GND pins. For input voltages below 6 V, 4.7 µF is sufficient. The capacitor must handle RMS currents up to 350 mA and exhibit low ESL to suppress high-frequency switching noise - critical for stable operation during automotive load-dump and cold-crank events. LM2734YQMK/NOPB relies on this capacitor to maintain input voltage integrity during 550-kHz switching transitions.
Does LM2734YQMK/NOPB require an external catch diode?
Yes, LM2734YQMK/NOPB requires an external Schottky catch diode (e.g., MBRM110L) connected between SW and GND. Unlike synchronous buck regulators, it uses an internal NMOS high-side switch only and relies on the external diode for low-side conduction during the off-time. This topology simplifies gate drive but mandates careful diode selection for VF < 0.4 V and IF ≥ 1 A to maintain >90% efficiency. LM2734YQMK/NOPB's current-limit and thermal protection remain fully active regardless of diode choice.
How does the BOOST capacitor function in LM2734YQMK/NOPB, and what value is recommended?
The BOOST capacitor (0.01 µF X7R ceramic, 16 V) forms a charge pump with the internal NMOS gate driver and SW node to generate gate voltage ≥2.5 V above SW during on-time. It must be placed directly between BOOST and SW pins with minimal trace length. During startup, internal circuitry charges it to ~VIN – 0.7 V; thereafter, it sustains gate drive using energy recovered from the inductor flyback. LM2734YQMK/NOPB will not achieve full 1-A output capability if BOOST voltage falls below 2.5 V relative to SW.
Can LM2734YQMK/NOPB be used in non-automotive industrial applications?
Yes, LM2734YQMK/NOPB is qualified for industrial use despite its AEC-Q100 Grade 1 rating. Its −40°C to +125°C operating range, 30-nA shutdown current, and robust protection features (UVLO, OVP, thermal shutdown, current limit) make it suitable for harsh-environment industrial controls, medical portable devices, and outdoor communications equipment. LM2734YQMK/NOPB retains full electrical specifications outside automotive test requirements, with no derating needed for non-automotive thermal or reliability validation.
What is the purpose of the EN pin on LM2734YQMK/NOPB, and how should it be interfaced?
EN (Enable) pin controls startup and shutdown of LM2734YQMK/NOPB: logic-high (>1.8 V) enables regulation; logic-low (<0.4 V) places the device in 30-nA shutdown mode. It must never float - tie to VIN via 100-kΩ pull-up if always-on operation is required. Driving EN directly from a microcontroller GPIO is safe provided voltage stays within −0.5 V to VIN + 0.3 V. LM2734YQMK/NOPB monitors EN continuously; no external debounce is needed due to built-in hysteresis.
LM2734YQMK/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
LM2734YQMK/NOPB FAQ
1.How can I place an order for LM2734YQMK/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2734YQMK/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 LM2734YQMK/NOPB reliable?
The price and inventory of LM2734YQMK/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2734YQMK/NOPB is usually 5 days.
3.What payment methods are accepted for LM2734YQMK/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2734YQMK/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2734YQMK/NOPB?
LM2734YQMK/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2734YQMK/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 LM2734YQMK/NOPB?
For technical support, including LM2734YQMK/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2734YQMK/NOPB requirements.
6.How does Aetrix verify that LM2734YQMK/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2734YQMK/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 LM2734YQMK/NOPB meets industry standards.
7.What is the process for return or replacement of LM2734YQMK/NOPB?
All LM2734YQMK/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2734YQMK/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 LM2734YQMK/NOPB part is unused and in its original packaging.
Return procedure for LM2734YQMK/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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