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Texas Instruments LM2734ZQSD/NOPB
- Part No.:
- LM2734ZQSD/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LM2734ZQSD/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:4,998
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Product details
Overview
LM2734ZQSD/NOPB from Texas Instruments (formerly National Semiconductor) is a monolithic, 3 MHz fixed-frequency PWM step-down DC-DC regulator with internal 300 mΩ NMOS switch, delivering up to 1 A output current across 3 V to 20 V input and 0.8 V to 18 V output ranges. It features current-mode control, internal soft-start, thermal shutdown, and output overvoltage protection - optimized for space-constrained automotive and portable point-of-load applications.
For engineers reviewing the LM2734ZQSD/NOPB datasheet, LM2734ZQSD/NOPB pinout, LM2734ZQSD/NOPB application, or LM2734ZQSD/NOPB equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification, 30 nA shutdown current, 0.8 V ±2% internal reference, 3 MHz switching frequency enabling sub-2 mm² inductor use, and 6-pin LLP (3 mm × 3 mm) package with exposed thermal pad.
Technical Context
The LM2734ZQSD/NOPB implements constant-frequency current-mode PWM control with internal compensation, supporting on-times as low as 13 ns to sustain regulation down to 0.8 V output across its full 3–20 V input range. Its 3 MHz oscillator is factory-trimmed and temperature-stable, eliminating external timing components.
It integrates a bootstrap gate-drive circuit for the internal NMOS switch, requiring only a 0.01 µF ceramic capacitor between BOOST and SW pins. The device uses pulse-by-pulse current limiting (1.2–2.5 A typ/max), undervoltage lockout (2.74 V rising threshold, 440 mV hysteresis), and junction-temperature-based thermal shutdown (165 °C trip, 150 °C recovery).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 3 MHz (±20%) - enables use of ≤2.2 µH inductors and chip-scale ceramic capacitors, minimizing PCB footprint |
| Input Voltage Range | 3 V to 20 V - supports wide-range industrial and automotive battery inputs including 12 V nominal systems |
| Output Voltage Range | 0.8 V to 18 V - set via external resistor divider; 0.8 V reference accurate to ±2% ensures tight regulation at low-VOUT rails |
| Max Output Current | 1 A continuous - sustained by internal 300 mΩ NMOS switch (TSOT-6) or 340 mΩ (LLP), with cycle-by-cycle current limit |
| Shutdown Current | 30 nA - ultra-low quiescent draw enables long-term battery operation in always-on automotive modules |
| Junction Temp Range | −40 °C to +125 °C - qualified per AEC-Q100 Grade 1, suitable for under-hood and infotainment environments |
| Thermal Resistance θJA | 118 °C/W (TSOT-6) - requires thermal vias under DAP for LLP variant to maintain safe junction temperature at full load |
Pinout & Package
LM2734ZQSD/NOPB is packaged in a 6-lead LLP (3 mm × 3 mm) with exposed die attach pad (DAP) internally connected to GND. This thermally enhanced package supports high-power-density layouts when mounted with ≥4 thermal vias to inner ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BOOST | Bootstrap supply node | Drives NMOS gate during high-side conduction; requires 0.01 µF X7R ceramic capacitor to SW; voltage must stay 1.6–5.5 V above SW |
| 2 - GND | Signal and power ground | Reference for feedback network and internal circuits; bottom resistor of FB divider must connect here for accuracy |
| 3 - FB | Feedback input | High-impedance (≤250 nA bias) node sensing output voltage via resistor divider; trace must be short and noise-shielded |
| 4 - EN | Enable control input | Logic-high (>1.8 V) enables regulation; logic-low (<0.4 V) enters 30 nA shutdown; must not float or exceed VIN + 0.3 V |
| 5 - VIN | Main input supply | Accepts 3–20 V; requires local 10 µF ceramic bypass capacitor with low ESL placed adjacent to pin |
| 6 - SW | Switch node | Connects to inductor, catch diode cathode, and BOOST capacitor; high dv/dt node requiring tight layout and minimal trace area |
| DAP | Die Attach Pad | Internally tied to GND; must be soldered to PCB ground plane with ≥4 thermal vias for thermal performance in LLP package |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive applications with −40 °C to +125 °C operation, enhanced manufacturing flow, and defect detection rigor |
| 3 MHz fixed-frequency PWM | Enables use of <2.2 µH inductors and 10–22 µF ceramic output caps - reduces solution size vs 500 kHz alternatives by >40% |
| Internal soft-start (200 µs ramp) | Prevents inrush current during power-up; eliminates need for external soft-start circuitry or sequencing controllers |
| Current-mode control + internal compensation | Provides stable regulation across line/load transients without external compensation components or loop tuning |
| Output overvoltage protection | Shuts off NMOS switch if FB exceeds 10% above 0.8 V reference - protects downstream 1.8 V/2.5 V ICs from fault-induced damage |
| Thermal shutdown with hysteresis | Turns off at 165 °C junction temp; resumes operation only after cooling to ~150 °C - prevents thermal runaway in sealed enclosures |
Applications
| Automotive Infotainment Power | USB-C PD Local Regulation |
|---|---|
Use Scenario: Powering 3.3 V/1.8 V rails for AM/FM tuners, display controllers, and audio codecs in head units. IC Role / Device Role / Timing Role: Primary buck converter supplying clean, low-noise local point-of-load voltage with fast transient response to burst-mode DSP loads. Use Value: AEC-Q100 Grade 1 rating ensures reliability in 105 °C ambient under-hood environments; 30 nA shutdown extends battery life during vehicle sleep mode. |
Use Scenario: Generating 5 V or 3.3 V from USB-C PD source (5–20 V) for embedded microcontrollers and sensors in portable accessories. IC Role / Device Role / Timing Role: Compact, high-efficiency step-down regulator interfacing directly with variable USB-C input without intermediate LDO stage. Use Value: 3 MHz switching allows use of tiny 1.0 × 1.0 mm inductors; internal soft-start prevents USB port overcurrent faults during plug-in events. |
| DSL Modem Point-of-Load | Industrial IoT Sensor Node |
Use Scenario: Regulating 1.2 V core and 3.3 V I/O supplies for ADSL/VDSL PHY and MAC processors in broadband modems. IC Role / Device Role / Timing Role: High-density DC-DC converter delivering regulated output with <10 µs transient recovery time to handle bursty packet processing loads. Use Value: Current-mode control maintains stability with ceramic output caps; 0.8 V reference enables precise 1.2 V generation via standard resistor ratios. |
Use Scenario: Powering ultra-low-power MCUs (e.g., MSP430, nRF52) and environmental sensors from 9 V or 12 V industrial batteries or PoE-derived rails. IC Role / Device Role / Timing Role: Efficient, always-on buck regulator with deep-sleep capability for multi-year battery life in remote monitoring nodes. Use Value: 30 nA shutdown current minimizes battery drain; wide 3–20 V input accommodates aging battery discharge curves and PoE voltage variation. |
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 sync buck, 3–17 V input, 1.2 A, 12 µA IQ (active), no AEC-Q100 grade | Higher light-load efficiency but lacks automotive qualification and 30 nA shutdown | Preferred for non-automotive portable designs where ultra-low active IQ matters more than shutdown current |
| MP2451DT-LF-Z | 2 MHz async buck, 3.3–36 V input, 0.6 A, 2.5 µA IQ (active), 1 µA shutdown, no AEC-Q100 | Wider input range and lower active IQ, but lower current rating and no automotive qualification | Suitable for industrial 24 V rail conversion where 1 A output is not required and cost sensitivity is high |
Compared with TPS62130ARGTR and MP2451DT-LF-Z, LM2734ZQSD/NOPB uniquely combines AEC-Q100 Grade 1 qualification, 1 A output, 30 nA shutdown, and 3 MHz operation in a 3 mm × 3 mm LLP package - making it the only drop-in option for automotive-grade 1 A point-of-load designs requiring minimal board area and guaranteed reliability.
Availability
LM2734ZQSD/NOPB is available at Aetrix Electronics and suitable for automotive infotainment systems, USB-powered peripherals, DSL modems, and industrial sensor nodes requiring stable component supply, long-lifecycle support, and AEC-Q100 compliance.
Supply support for LM2734ZQSD/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 analog power portfolio with rigorous automotive and industrial qualification standards.
The LM2734ZQSD/NOPB belongs to TI's automotive-qualified DC-DC regulator family, designed specifically for compact, high-frequency point-of-load conversion in harsh-environment applications such as body control modules and ADAS subsystems.
FAQ
What is the recommended inductor value for LM2734ZQSD/NOPB operating at 5 V input and 3.3 V output?
For LM2734ZQSD/NOPB at VIN = 5 V and VOUT = 3.3 V, a 2.2 µH shielded ferrite inductor rated for ≥1.25 A peak current is recommended. This value balances ripple current (~0.4 A pk-pk), size, and efficiency - consistent with TI's reference design and electrical characteristics showing optimal performance at 3 MHz with 2.2 µH. Ensure DC resistance is <75 mΩ to minimize conduction loss.
Does LM2734ZQSD/NOPB require an external catch diode?
Yes, LM2734ZQSD/NOPB requires an external Schottky catch diode (e.g., RB050M-30, BAT54) connected between SW and GND. The device lacks synchronous rectification, so the diode conducts during the NMOS off-time. Select a diode with forward voltage <0.4 V at 1 A and reverse voltage rating >24 V to ensure reliability across input transients.
How is the output voltage set on LM2734ZQSD/NOPB?
The output voltage of LM2734ZQSD/NOPB is set using a resistor divider from VOUT to FB to GND. With a 0.8 V ±2% internal reference, VOUT = 0.8 V × (1 + R1/R2). For example, R2 = 10 kΩ and R1 = 31.25 kΩ yields 3.3 V. TI recommends placing R2's ground connection directly at the GND pin to avoid trace impedance errors.
Can LM2734ZQSD/NOPB operate with input voltage below 3 V?
No - LM2734ZQSD/NOPB has a guaranteed minimum operating input voltage of 3 V per its Absolute Maximum and Operating Ratings. Undervoltage lockout activates below 2.74 V (rising), and the device will not regulate. Attempting operation below 3 V risks unstable switching, excessive dropout, or failure to start; use a different regulator (e.g., TPS62840) for sub-3 V inputs.
What is the thermal pad (DAP) connection requirement for LM2734ZQSD/NOPB?
The DAP of LM2734ZQSD/NOPB is internally connected to GND and must be soldered to a dedicated PCB ground plane using ≥4 thermal vias (0.3 mm diameter, spaced evenly). Failure to do so increases θJA beyond 118 °C/W, risking thermal shutdown at >500 mA load in still air - especially critical in automotive applications where ambient temperatures exceed 85 °C.
LM2734ZQSD/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)
LM2734ZQSD/NOPB FAQ
1.How can I place an order for LM2734ZQSD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2734ZQSD/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 LM2734ZQSD/NOPB reliable?
The price and inventory of LM2734ZQSD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2734ZQSD/NOPB is usually 5 days.
3.What payment methods are accepted for LM2734ZQSD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2734ZQSD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2734ZQSD/NOPB?
LM2734ZQSD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2734ZQSD/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 LM2734ZQSD/NOPB?
For technical support, including LM2734ZQSD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2734ZQSD/NOPB requirements.
6.How does Aetrix verify that LM2734ZQSD/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2734ZQSD/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 LM2734ZQSD/NOPB meets industry standards.
7.What is the process for return or replacement of LM2734ZQSD/NOPB?
All LM2734ZQSD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2734ZQSD/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 LM2734ZQSD/NOPB part is unused and in its original packaging.
Return procedure for LM2734ZQSD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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