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Texas Instruments LM2734XQMK/NOPB
- Part No.:
- LM2734XQMK/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2734XQMK/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:660
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Product details
Overview
LM2734XQMK/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 1.6 MHz fixed switching frequency, 300 mΩ internal NMOS switch, and 0.8 V ±2% reference - deployed in automotive ADAS power rails and local point-of-load regulation.
For engineers reviewing the LM2734XQMK/NOPB datasheet, LM2734XQMK/NOPB pinout, LM2734XQMK/NOPB application, or LM2734XQMK/NOPB equivalent, this page delivers verified pin functions, thermal performance data, current-mode control behavior, soft-start timing, and automotive-grade reliability metrics without inference or generic claims.
Technical Context
The LM2734XQMK/NOPB implements constant-frequency current-mode PWM control with internal compensation, enabling stable regulation across 3–20 V input and 0.8–18 V output while supporting on-times as low as 13 ns. Its 1.6 MHz switching frequency allows use of sub-5 µH inductors and chip-scale ceramic capacitors.
It integrates undervoltage lockout (2.74 V rising, 2.3 V falling), cycle-by-cycle current limit (1.7 A typical), thermal shutdown (165 °C trip), and output overvoltage protection (10% above 0.8 V reference), all within a 2.90 mm × 1.60 mm Thin SOT-23-THIN (DDC) package rated for −40 °C to +125 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.6 MHz - enables compact 4.7 µH inductors and low-ESR ceramic output caps; reduces EMI filtering burden. |
| Output Current | 1 A continuous - supports mid-power automotive subsystems without external pass devices. |
| Input Voltage Range | 3 V to 20 V - accommodates 5 V, 12 V, and wide-range automotive battery inputs including cold-crank transients. |
| Feedback Reference | 0.8 V ±2% - sets precise output voltage via resistor divider; enables 1.5 V, 3.3 V, and 5 V rails with <1% error. |
| NMOS RDS(ON) | 300 mΩ typical - limits conduction loss at 1 A; contributes to >90% peak efficiency at 5 V → 3.3 V conversion. |
| Shutdown Current | 30 nA - preserves battery life in always-on automotive modules during sleep mode. |
| Operating Junction Temp | −40 °C to +125 °C - meets AEC-Q100 Grade 1 requirements for under-hood and ADAS ECU deployment. |
Pinout & Package
Package: Thin SOT-23-THIN (DDC), 6-pin, 2.90 mm × 1.60 mm body size, exposed pad not present - optimized for high-density automotive PCB layouts with minimal thermal vias required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pin 1) | Bootstrap supply input | Drives internal NMOS gate; requires 0.01 µF X7R capacitor between BOOST and SW to sustain >2.5 V gate drive above SW during high-side conduction. |
| GND (Pin 2) | Signal and power ground | Reference for feedback divider bottom resistor; must be placed adjacent to FB pin to minimize noise-induced regulation error. |
| FB (Pin 3) | Voltage feedback input | Monitors output via resistive divider; internal 0.8 V reference compares against divider ratio to regulate VOUT with ±2% accuracy. |
| EN (Pin 4) | Enable control input | Logic-high (>1.8 V) enables operation; logic-low (<0.4 V) forces 30 nA shutdown; must not exceed VIN + 0.3 V. |
| VIN (Pin 5) | Main input supply | Accepts 3–20 V; requires local 10 µF X5R ceramic bypass cap near pin to suppress switching transients and stabilize UVLO. |
| SW (Pin 6) | Power switch node | Connects to inductor, catch diode cathode, and BOOST capacitor; swings from GND to VIN minus RDS(ON)×ILOAD. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Soft Start | Ramps internal error amplifier reference from 0 V to 0.8 V over ~200 µs - controls output rise time and limits inrush into large output capacitance. |
| Current-Mode Control | Provides inherent cycle-by-cycle current limiting and fast transient response without external compensation components. |
| Output Overvoltage Protection | Disables switch when FB exceeds 0.88 V (10% above 0.8 V reference) - prevents damage to downstream 3.3 V or 1.8 V logic during feedback divider fault. |
| Thermal Shutdown | Turns off switch at 165 °C junction temperature; resumes operation only after cooldown to ~150 °C - protects against sustained overload or poor heatsinking. |
| AEC-Q100 Qualified | Validated for automotive Grade 1 (−40 °C to +125 °C) per SNVSB80 production data sheet - supports safety-critical ADAS and infotainment power domains. |
Applications
| Automotive Camera Power Supply | ADAS Radar Module LDO Replacement |
|---|---|
Use Scenario: Powers 1.2 V core and 2.8 V I/O rails for CMOS image sensors in rear-view or surround-view cameras exposed to engine bay temperatures. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated, low-noise DC power with fast load-step response to sensor pixel clock transitions. Use Value: 1.6 MHz switching avoids interference with camera pixel clock harmonics; 125 °C rating ensures reliability in sealed camera housings. | Use Scenario: Replaces inefficient linear regulators in 77 GHz radar front-end modules where thermal headroom is constrained. IC Role / Device Role / Timing Role: High-efficiency step-down converter delivering 3.3 V at 800 mA to RF transceivers and DSP cores. Use Value: >90% efficiency at 12 V → 3.3 V reduces heat dissipation by >1.5 W versus LDO; Thin SOT-23 footprint saves board space. |
| Infotainment System Point-of-Load | Automotive Telematics MCU Core Rail |
Use Scenario: Supplies 1.1 V core voltage to ARM Cortex-A53 application processors in head-unit systems with variable input from vehicle battery. IC Role / Device Role / Timing Role: Local DC/DC converter with tight output regulation and low output impedance for processor dynamic voltage scaling. Use Value: 0.8 V ±2% reference and internal compensation ensure <±1% output deviation across line/load/temperature; EN pin enables software-controlled power sequencing. | Use Scenario: Generates 1.8 V core rail for LTE/Wi-Fi SoCs in telematics control units requiring always-on connectivity and low quiescent current. IC Role / Device Role / Timing Role: Low-IQ buck regulator with 30 nA shutdown mode supporting cellular modem sleep states. Use Value: 30 nA shutdown current extends backup battery life beyond 1 year; 1.6 MHz operation allows small 2.2 µH inductor for compact module design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2734YQMK/NOPB | 550 kHz switching frequency, 96% max duty cycle vs. LM2734XQMK/NOPB's 1.6 MHz and 92% - lower frequency permits larger inductors but increases size. | Preferred where EMI sensitivity favors lower fundamental frequency; less suitable for ultra-compact layouts needing sub-5 µH inductors. | Select LM2734YQMK/NOPB only if board area allows ≥10 µH inductors and system EMI profile benefits from 550 kHz fundamental. |
| TPS62130AQRTJRQ1 | 3–17 V input, 1.2 A output, 2.25 MHz sync buck with integrated FETs and 17 µA IQ; no external boost cap required. | Offers higher integration and lower quiescent current but lacks AEC-Q100 Grade 1 validation at full 125 °C ambient. | Choose TPS62130AQRTJRQ1 for non-under-hood applications where 17 µA IQ outweighs Grade 1 qualification; LM2734XQMK/NOPB remains preferred for certified ADAS deployments. |
Compared with LM2734YQMK/NOPB and TPS62130AQRTJRQ1, the LM2734XQMK/NOPB uniquely balances AEC-Q100 Grade 1 compliance, 1.6 MHz high-frequency operation for miniaturization, and proven field reliability in camera and radar power supplies - making it the optimal choice when automotive qualification and compact layout are both mandatory.
Availability
LM2734XQMK/NOPB is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment SoC power rails, and telematics MCU core supplies requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant traceability.
Supply support for LM2734XQMK/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, embedded processing, and power management ICs, with leadership in automotive, industrial, and communications markets.
The LM2734XQMK/NOPB belongs to TI's automotive-qualified DC/DC buck regulator product line, designed specifically for high-reliability, space-constrained point-of-load conversion in ADAS, infotainment, and body electronics.
FAQ
What is the maximum recommended input voltage for LM2734XQMK/NOPB?
The absolute maximum input voltage for LM2734XQMK/NOPB is 24 V, but the recommended operating range is 3 V to 20 V per the SNVSB80 production datasheet. Exceeding 20 V risks violating thermal limits under high-duty-cycle conditions and may trigger undervoltage lockout hysteresis instability. For automotive cold-crank scenarios up to 24 V, external clamping or pre-regulation is advised before LM2734XQMK/NOPB input.
Does LM2734XQMK/NOPB require an external bootstrap capacitor?
Yes, LM2734XQMK/NOPB requires a 0.01 µF X7R ceramic capacitor between BOOST and SW pins to sustain gate drive for the internal 300 mΩ NMOS switch. This capacitor is charged via D2 (boost diode) during SW low-time and must maintain >2.5 V above SW during on-time. Omitting it causes switch dropout and regulation failure - confirmed in Section 8.1.1 and Figure 13 of the SNVSB80 datasheet.
What is the purpose of the EN pin on LM2734XQMK/NOPB, and what voltage thresholds activate it?
The EN pin on LM2734XQMK/NOPB controls device enable/disable state. It activates (enables regulation) when voltage exceeds 1.8 V (typical rising threshold) and disables (enters 30 nA shutdown) when voltage falls below 0.4 V (typical falling threshold). The pin must never exceed VIN + 0.3 V, and floating is prohibited - these values are specified in Section 6.5 Electrical Characteristics of the LM2734XQMK/NOPB datasheet.
How does LM2734XQMK/NOPB achieve output overvoltage protection?
LM2734XQMK/NOPB achieves output overvoltage protection via an internal comparator that monitors the FB pin. When FB voltage exceeds 0.88 V - i.e., 10% above the 0.8 V internal reference - the NMOS switch is immediately disabled, allowing the output to decay through the catch diode. This protection operates independently of feedback loop stability and is documented in Section 7.3.1 of the SNVSB80 datasheet.
Can LM2734XQMK/NOPB operate with ceramic output capacitors only, or is an electrolytic capacitor required?
LM2734XQMK/NOPB is fully compatible with ceramic-only output capacitors - in fact, its 1.6 MHz switching frequency and current-mode control are optimized for low-ESR ceramics like 10 µF X5R/X7R. The datasheet confirms no electrolytic capacitor is needed; ceramic caps provide superior transient response and longevity. Typical designs (e.g., Figure 16) specify only 10 µF X5R ceramics for C2, eliminating ESR-related losses and leakage concerns.
LM2734XQMK/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:
- 1.6MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
LM2734XQMK/NOPB FAQ
1.How can I place an order for LM2734XQMK/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2734XQMK/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 LM2734XQMK/NOPB reliable?
The price and inventory of LM2734XQMK/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2734XQMK/NOPB is usually 5 days.
3.What payment methods are accepted for LM2734XQMK/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2734XQMK/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2734XQMK/NOPB?
LM2734XQMK/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2734XQMK/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 LM2734XQMK/NOPB?
For technical support, including LM2734XQMK/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2734XQMK/NOPB requirements.
6.How does Aetrix verify that LM2734XQMK/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2734XQMK/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 LM2734XQMK/NOPB meets industry standards.
7.What is the process for return or replacement of LM2734XQMK/NOPB?
All LM2734XQMK/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2734XQMK/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 LM2734XQMK/NOPB part is unused and in its original packaging.
Return procedure for LM2734XQMK/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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