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Texas Instruments LM2734ZQSDX/NOPB
- Part No.:
- LM2734ZQSDX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LM2734ZQSDX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,854
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Product details
Overview
LM2734ZQSDX/NOPB from Texas Instruments (formerly National Semiconductor) is a monolithic 3 MHz PWM step-down DC-DC regulator in a 6-lead LLP (3 mm × 3 mm) package, featuring an internal 300 mΩ NMOS switch, 1 A output current capability, 0.8 V to 18 V adjustable output, and 30 nA shutdown current. It delivers high power density for space-constrained point-of-load regulation in automotive and USB-powered systems.
For engineers reviewing the LM2734ZQSDX/NOPB datasheet, LM2734ZQSDX/NOPB pinout, LM2734ZQSDX/NOPB application, or LM2734ZQSDX/NOPB equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification, 3 MHz fixed switching frequency enabling ultra-small magnetics, current-mode control with internal compensation, and thermal shutdown with 165°C trip point.
Technical Context
The LM2734ZQSDX/NOPB employs current-mode PWM control with internal compensation, supporting stable regulation across 3 V–20 V input and 0.8 V–18 V output ranges. Its 3 MHz oscillator enables sub-1 µs minimum on-time (13 ns), allowing high-frequency operation without external loop compensation.
It integrates a bootstrap gate-drive circuit (BOOST/SW pins), pulse-by-pulse current limiting (1.7 A typ), undervoltage lockout (2.9 V rising threshold), and internal soft-start (200 µs ramp). The device uses BiCMOS process technology and features output overvoltage protection triggered at FB = 1.1 V (10% above 0.8 V reference).
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, minimizing PCB footprint. |
| Output Current | 1 A continuous - supports local regulation for microcontrollers, sensors, and USB peripherals without external pass devices. |
| Input Voltage Range | 3 V to 20 V - accommodates wide-input industrial and automotive supplies, including 12 V battery systems with transients. |
| Feedback Reference | 0.8 V ±2% - sets precise output voltage via external resistor divider; enables 0.8 V minimum output for low-voltage logic rails. |
| Shutdown Current | 30 nA - ensures negligible battery drain in always-on automotive modules during sleep mode. |
| Internal NMOS RDS(ON) | 300 mΩ (TSOT), 340 mΩ (LLP) - defines conduction loss at full load; LLP variant's slightly higher resistance reflects package thermal trade-off. |
| Current Limit Threshold | 1.2 A min / 1.7 A typ - provides cycle-by-cycle protection against short-circuit and overload while permitting 1 A sustained output. |
Pinout & Package
LM2734ZQSDX/NOPB is packaged in a thermally enhanced 6-lead LLP (3 mm × 3 mm, NS Package Number SDE06A) with exposed die attach pad (DAP) internally connected to GND. The DAP must be soldered to a PCB thermal pad with ≥4 thermal vias for effective heat dissipation in automotive applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BOOST | Bootstrap supply node | Drives NMOS gate; requires 0.01 µF ceramic capacitor between BOOST and SW to sustain >2.5 V gate drive above SW during on-time. |
| 2 - GND | Signal and power ground | Reference for feedback, enable, and internal circuits; must be tied directly to DAP and low-impedance ground plane. |
| 3 - FB | Feedback input | High-impedance (250 nA max) node sensing resistor divider output; trace must be short and远离 noisy SW node. |
| 4 - EN | Enable control | Logic-high (>1.8 V) enables regulation; logic-low (<0.4 V) disables with 30 nA quiescent current; must not float. |
| 5 - VIN | Main input supply | Accepts 3–20 V; requires ≥10 µF low-ESL ceramic bypass capacitor placed adjacent to pin. |
| 6 - SW | Power switch output | Connects to inductor and catch diode anode; carries high di/dt; must be routed short and wide with minimal loop area. |
| DAP | Die Attach Pad | Internally connected to GND; mandatory thermal connection to PCB ground plane via ≥4 thermal vias for junction temp control. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualified | Rated for −40°C to +125°C junction temperature with automotive-grade manufacturing flow and defect detection. |
| 3 MHz fixed-frequency PWM | Enables <1 mm² total passive component area (inductor + caps); eliminates need for external frequency programming. |
| Internal soft-start (200 µs) | Prevents inrush current into output capacitance during power-up; avoids input rail sag and system reset. |
| Output overvoltage protection | Disables switch when FB exceeds 1.1 V (10% above 0.8 V ref), protecting downstream 1.8 V/2.5 V/3.3 V ICs. |
| Thermal shutdown (165°C) | Protects against sustained overload or poor heatsinking; auto-recovery at ~150°C prevents latch-up. |
Applications
| Automotive Infotainment Power Supply | USB-C PD Sink Rail Regulation |
|---|---|
Use Scenario: Powers display controller, audio codec, and CAN transceiver in head unit under 12 V battery input with cold-crank (4.5 V) and load-dump (28 V) transients. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 3.3 V/1 A rail; operates continuously across automotive temperature range with AEC-Q100 compliance. Use Value: Eliminates need for external current-sense resistor or compensation network; 30 nA shutdown extends battery life during vehicle off-state. | Use Scenario: Generates 5 V/1 A auxiliary rail from USB-C PD source (9 V/15 V/20 V) for embedded MCU and sensors in portable diagnostic tool. IC Role / Device Role / Timing Role: Input-flexible step-down converter accepting variable PD source voltages; 3 MHz switching avoids AM radio band interference. Use Value: Supports fast transient response to USB enumeration bursts; internal current limit protects against cable fault conditions. |
| Industrial IoT Sensor Node | DSL Modem Local Bias Supply |
Use Scenario: Supplies 1.8 V/1 A to ARM Cortex-M4 and RF transceiver in battery-backed wireless sensor node with 3.6 V Li-ion input. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator; leverages 30 nA shutdown and 85% peak efficiency to maximize runtime. Use Value: Enables >10-year battery life in low-duty-cycle monitoring; small LLP package fits within 8 mm × 8 mm module footprint. | Use Scenario: Provides clean 3.3 V/1 A bias for ADSL line driver and PHY in residential DSL modem powered from 5 V or 12 V main supply. IC Role / Device Role / Timing Role: Low-noise local regulator decoupling digital and analog sections; uses ceramic output caps to suppress switching ripple. Use Value: Achieves <10 mVpp output ripple at full load without LC filters; 3 MHz frequency avoids audible noise in transformer-coupled lines. |
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, 3 A output, 2.95–6 V input, integrated FETs, but no AEC-Q100 qualification | Higher current, narrower input range; suited for consumer portables, not automotive | Select if >1 A load or lower VIN required; avoid for automotive due to missing qualification. |
| MP2315GJ-Z | 2.2 MHz, 2 A, 4.5–26 V input, 0.8 V ref, but 10 µA shutdown current and no OVP | Wider input range and higher current; lacks output overvoltage protection and AEC-Q100 Grade 1 | Choose for industrial 24 V systems needing >1 A; add external OVP if downstream ICs require it. |
Compared with TPS62130ARGTR and MP2315GJ-Z, LM2734ZQSDX/NOPB uniquely combines AEC-Q100 Grade 1 qualification, 30 nA shutdown, and integrated output overvoltage protection-making it the only option qualified for safety-critical automotive domains requiring zero-battery-drain sleep modes and robust fault coverage.
Availability
LM2734ZQSDX/NOPB is available at Aetrix Electronics and suitable for automotive infotainment, USB-powered diagnostics, and industrial IoT sensor nodes requiring stable component supply with long-term lifecycle support.
Supply support for LM2734ZQSDX/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 documentation and long-term product commitments.
The LM2734Z series was designed specifically for compact, high-frequency point-of-load DC-DC conversion in automotive and portable electronics, emphasizing minimal external components, thermal robustness, and AEC-Q100 compliance.
FAQ
What is the maximum recommended junction temperature for continuous operation of LM2734ZQSDX/NOPB?
The LM2734ZQSDX/NOPB has a maximum junction temperature of 125°C for continuous operation per its AEC-Q100 Grade 1 specification. Thermal shutdown activates at 165°C to prevent damage, but sustained operation above 125°C may impact reliability and lifetime. Proper PCB thermal design-including DAP soldering and ≥4 thermal vias-is essential to maintain TJ ≤125°C at 1 A load in ambient temperatures up to 85°C. The LM2734ZQSDX/NOPB datasheet specifies θJA = 118°C/W for TSOT-6, but LLP package thermal performance depends heavily on layout.
Does LM2734ZQSDX/NOPB require external compensation components?
No, LM2734ZQSDX/NOPB uses internal compensation and does not require external compensation components. Its current-mode control architecture with built-in error amplifier and PWM comparator eliminates the need for external RC networks or type-II/type-III compensators. This simplifies design and reduces BOM count-only the feedback resistors, input/output capacitors, inductor, catch diode, and BOOST capacitor are required. The LM2734ZQSDX/NOPB datasheet confirms internal compensation across the full operating range.
Can LM2734ZQSDX/NOPB operate with a 2.5 V input supply?
No, LM2734ZQSDX/NOPB cannot operate with a 2.5 V input supply. Its absolute minimum input voltage is 3 V, and undervoltage lockout (UVLO) disables operation until VIN rises above 2.74 V (typical). Below 3 V, the internal NMOS switch cannot be properly driven, and regulation fails. For 2.5 V input applications, consider alternatives such as the TPS6282x family (1.8–5.5 V input) or LM2678 (8 V min), but note that none match the LM2734ZQSDX/NOPB's AEC-Q100 Grade 1 rating. Always verify VIN ≥3 V in final design.
What is the purpose of the BOOST pin on LM2734ZQSDX/NOPB, and how is it configured?
The BOOST pin on LM2734ZQSDX/NOPB supplies gate drive voltage to the internal NMOS switch via a bootstrap capacitor connected between BOOST and SW. During SW low-time, BOOST charges to VIN minus diode drop; during SW high-time, BOOST rises to ~2×VIN, sustaining sufficient gate-source voltage (>2.5 V above SW) for low RDS(ON). A 0.01 µF X7R ceramic capacitor is required between BOOST and SW. Connecting BOOST to VIN (via Schottky diode) is standard; alternate configurations using VOUT or zener-clamped VIN are documented for special input/output voltage combinations. The LM2734ZQSDX/NOPB datasheet specifies BOOST–SW must stay within 1.6–5.5 V.
Is LM2734ZQSDX/NOPB pin-compatible with LM2734ZSDX/NOPB?
Yes, LM2734ZQSDX/NOPB is pin-compatible with LM2734ZSDX/NOPB. Both use identical 6-lead LLP (SDE06A) packages with identical pinout, footprint, and thermal pad configuration. The "Q" suffix denotes AEC-Q100 Grade 1 qualification and automotive-grade manufacturing flow, but electrical specifications, pin functions, and layout requirements are fully aligned. Designers may substitute LM2734ZQSDX/NOPB for LM2734ZSDX/NOPB in automotive designs without PCB changes, provided the full AEC-Q100 test report and PPAP documentation are obtained from TI.
LM2734ZQSDX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- 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:
- 6-WSON (3x3)
LM2734ZQSDX/NOPB FAQ
1.How can I place an order for LM2734ZQSDX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2734ZQSDX/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 LM2734ZQSDX/NOPB reliable?
The price and inventory of LM2734ZQSDX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2734ZQSDX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2734ZQSDX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2734ZQSDX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2734ZQSDX/NOPB?
LM2734ZQSDX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2734ZQSDX/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 LM2734ZQSDX/NOPB?
For technical support, including LM2734ZQSDX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2734ZQSDX/NOPB requirements.
6.How does Aetrix verify that LM2734ZQSDX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2734ZQSDX/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 LM2734ZQSDX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2734ZQSDX/NOPB?
All LM2734ZQSDX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2734ZQSDX/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 LM2734ZQSDX/NOPB part is unused and in its original packaging.
Return procedure for LM2734ZQSDX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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