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Texas Instruments LM2734ZSDX/NOPB
- Part No.:
- LM2734ZSDX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LM2734ZSDX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A 6WSON
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM2734ZSDX/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 reference accuracy (±2%), and 30 nA shutdown current. It delivers local point-of-load regulation for space-constrained battery- or USB-powered systems with fast transient response and minimal external components.
For engineers reviewing the LM2734ZSDX/NOPB datasheet, LM2734ZSDX/NOPB pinout, LM2734ZSDX/NOPB application, or LM2734ZSDX/NOPB equivalent, key selection criteria include its fixed 3 MHz switching frequency, 3.0–20 V input range, 0.8–18 V adjustable output, current-mode control architecture, and thermal/overvoltage protections - all critical for compact, high-efficiency buck converter design in portable and automotive subsystems.
Technical Context
The LM2734ZSDX/NOPB employs current-mode PWM control with internal compensation and a fixed 3 MHz oscillator, enabling stable regulation without external loop compensation. Its 13 ns minimum on-time supports low-duty-cycle operation down to 0.8 V output across the full 3–20 V input range.
It integrates a 300 mΩ NMOS power switch (TSOT-6) or 340 mΩ (LLP), bootstrap gate drive circuitry requiring external BOOST capacitor and diode, and protection features including pulse-by-pulse current limit (1.7 A typ), thermal shutdown (165°C), and output overvoltage detection (10% above VFB).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 3 MHz (fixed); enables use of sub-3 mm ceramic inductors and chip capacitors, minimizing PCB footprint. |
| Input Voltage Range | 3.0 V to 20 V; supports wide-input applications including 5 V/12 V rails and automotive battery-supplied circuits. |
| Output Voltage Range | 0.8 V to 18 V (adjustable via FB resistor divider); 0.8 V ±2% internal reference ensures tight regulation at low-voltage loads. |
| Max Output Current | 1 A continuous; limited by internal NMOS RDS(ON) (340 mΩ in LLP) and thermal design margin. |
| Shutdown Current | 30 nA typical; enables ultra-low-power standby in battery-operated devices without external load switches. |
| Feedback Reference | 0.800 V ±16 mV (2%); sets output voltage accuracy and defines minimum achievable VOUT with external resistors. |
| Current Limit Threshold | 1.2 A min / 1.7 A typ; provides cycle-by-cycle protection against short-circuit or overload conditions. |
Pinout & Package
The LM2734ZSDX/NOPB is packaged in a 6-lead LLP (3 mm × 3 mm, NS Package Number SDE06A) with exposed die attach pad (DAP) internally connected to GND for enhanced thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 – BOOST | Bootstrap supply node | Drives NMOS gate during high-side conduction; requires external 0.01 µF ceramic capacitor between BOOST and SW pins. |
| 2 – GND | Signal and power ground | Reference for feedback network and internal circuitry; DAP connects directly to this node for thermal dissipation. |
| 3 – FB | Feedback input | High-impedance (250 nA max) node sensing output voltage via resistor divider; trace must be short and noise-isolated. |
| 4 – EN | Enable control input | Logic-high (>1.8 V) enables regulation; logic-low (<0.4 V) enters 30 nA shutdown mode; must not float. |
| 5 – VIN | Main input supply | Accepts 3–20 V; requires local 10 µF ceramic bypass capacitor placed near pin with low-ESL layout. |
| 6 – SW | Switch node | Connects to inductor, catch diode cathode, and BOOST capacitor; carries high di/dt AC current - minimize trace length and loop area. |
Key Features
| Feature | Design Value |
|---|---|
| Internal 300 mΩ NMOS switch (LLP) | Reduces external component count and board area while delivering 1 A load with <85% efficiency at 5 V → 3.3 V conversion. |
| 3 MHz fixed-frequency PWM | Enables use of tiny 1–2.2 µH shielded inductors and 10 µF ceramic output capacitors - ideal for ultra-compact layouts. |
| Current-mode control + internal compensation | Eliminates need for external compensation network; provides stable regulation across line, load, and temperature variations. |
| Integrated soft-start (200 µs ramp) | Controls output voltage rise time to limit inrush current into downstream capacitance, preventing input rail droop or reset glitches. |
| Comprehensive protection suite | Includes thermal shutdown (165°C), output overvoltage lockout (10% above VFB), undervoltage lockout (2.74 V rising threshold), and pulse-by-pulse current limit. |
Applications
| DSL Modems | USB-Powered Devices |
|---|---|
Use Scenario: Powering PHY, DSP, and interface ICs in compact DSL modem designs where board space and heat dissipation are constrained. IC Role / Device Role / Timing Role: Primary step-down regulator converting 5 V USB or wall-adapter input to 1.2 V, 1.8 V, or 3.3 V rails for digital baseband and analog front-end circuits. Use Value: 3 MHz operation allows sub-3 mm inductors and eliminates need for bulky electrolytic capacitors - reducing total solution size by >40% vs lower-frequency alternatives. | Use Scenario: Providing regulated 3.3 V or 5 V power to microcontrollers, sensors, and USB peripherals in portable diagnostic tools or IoT edge nodes. IC Role / Device Role / Timing Role: Local point-of-load regulator accepting unregulated 5 V from USB Type-A or Type-C ports and delivering stable, low-noise output under dynamic load changes. Use Value: 30 nA shutdown current extends battery life in sleep modes; internal soft-start prevents USB port overcurrent faults during plug-in events. |
| Battery-Powered Devices | Automotive Infotainment Subsystems |
Use Scenario: Supplying core voltage to ARM Cortex-M microcontrollers and display drivers in handheld medical instruments or barcode scanners. IC Role / Device Role / Timing Role: High-efficiency buck converter stepping down single-cell Li-ion (3.0–4.2 V) or dual-cell (6–8.4 V) battery voltage to 1.2 V or 1.8 V logic rails. Use Value: 0.8 V reference and 13 ns minimum on-time support low-VOUT operation even at low battery voltages - maintaining system functionality until end-of-discharge. | Use Scenario: Generating 3.3 V or 5 V auxiliary supplies for CAN transceivers, audio codecs, or touch controllers in vehicle head units or ADAS camera modules. IC Role / Device Role / Timing Role: Secondary regulator fed from main 12 V automotive rail, providing clean, protected power to sensitive digital subsystems operating in harsh EMI/noise environments. Use Value: AEC-Q100 Grade 1 qualified variants (e.g., LM2734ZQSDX) ensure reliability at −40°C to +125°C junction temperature; integrated OVP and UVLO prevent fault propagation during load-dump or cold-crank events. |
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 synchronous buck with integrated high-/low-side FETs; 95% peak efficiency; 2.95–6 V input; 0.9–6 V output; 3 A capability. | Higher current, synchronous rectification, narrower input range - better suited for 3.3 V/5 V rail generation from single Li-ion or USB PD sources. | Select when higher efficiency (>90%) and >1 A output are required; requires no external catch diode but needs careful layout for EMI control. |
| MP2307DN-LF-Z | 340 kHz fixed-frequency buck; 4.5–23 V input; 0.925–20 V output; 3 A; external diode; 120 mΩ RDS(ON). | Lower switching frequency increases inductor/capacitor size; higher current rating but larger thermal footprint and slower transient response. | Choose for cost-sensitive industrial applications where board area is less constrained and 340 kHz EMI filtering is acceptable. |
Compared with TPS62130ARGTR and MP2307DN-LF-Z, the LM2734ZSDX/NOPB offers superior power density due to its 3 MHz operation and LLP package, making it optimal for space-limited designs where 1 A output and 30 nA shutdown are prioritized over peak efficiency or raw current capacity.
Availability
LM2734ZSDX/NOPB is available at Aetrix Electronics and suitable for DSL modems, USB-powered devices, and battery-operated instrumentation requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2734ZSDX/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 full datasheet, simulation model, and WEBENCH® design tool support.
The LM2734Z series belongs to TI's high-frequency, thin-package DC-DC regulator family, engineered for minimal PCB area in portable, telecom, and automotive subsystems where fast transient response and low quiescent current are essential.
FAQ
What is the recommended inductor value for LM2734ZSDX/NOPB in a 5 V to 3.3 V, 1 A application?
For LM2734ZSDX/NOPB operating at 3 MHz with 5 V input and 3.3 V output delivering 1 A, a 1.5 µH to 2.2 µH shielded ferrite inductor rated for ≥1.25 A saturation current is recommended. The LM2734ZSDX/NOPB datasheet specifies that ripple current should be 30–40% of output current (0.3–0.4 A), and typical evaluation boards use 2.2 µH. Lower values reduce size but increase ripple; higher values improve ripple suppression at the cost of transient response speed.
Does LM2734ZSDX/NOPB require an external catch diode, and what type is recommended?
Yes, LM2734ZSDX/NOPB requires an external Schottky catch diode connected between SW and GND. A BAT54 or similar low-forward-voltage (≤0.4 V), fast-recovery Schottky diode rated for ≥1.2 A average current and ≥20 V reverse voltage is recommended. The LM2734ZSDX/NOPB does not integrate a synchronous rectifier, so the diode conducts during the off-time and directly impacts efficiency - especially at low output voltages.
Can LM2734ZSDX/NOPB operate with input voltage below 3 V?
No, LM2734ZSDX/NOPB has a guaranteed operating input range of 3.0 V to 20 V per its Absolute Maximum and Operating Ratings. Undervoltage lockout activates below 2.74 V (rising threshold), and the internal NMOS switch cannot sustain proper gate drive below ~3 V due to insufficient BOOST voltage margin. For sub-3 V inputs, consider TI's TPS6208x or similar low-VIN buck regulators.
How is the output voltage set on LM2734ZSDX/NOPB, and what tolerance should be expected?
The output voltage of LM2734ZSDX/NOPB is set using a resistor divider from VOUT to FB to GND, where VFB = 0.800 V ±16 mV (2%). With R2 = 10 kΩ to GND, R1 = R2 × ((VOUT/0.8) − 1). Total output tolerance includes reference error, resistor tolerance, and line/load regulation (±0.01%/V); typical production designs achieve ±2.5% total output error using 1% resistors.
Is LM2734ZSDX/NOPB pin-compatible with LM2734ZMKX or other package variants?
No, LM2734ZSDX/NOPB (6-lead LLP, 3 mm × 3 mm) is not pin-compatible with LM2734ZMKX (TSOT-6, 2.9 mm × 1.6 mm). Although both share identical pin functions (BOOST, GND, FB, EN, VIN, SW), their physical footprints, thermal pads, and solder reflow profiles differ significantly. PCB layout, thermal vias, and land patterns must be redesigned when switching between LLP and TSOT packages - no mechanical or electrical drop-in replacement is possible.
LM2734ZSDX/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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WSON (3x3)
LM2734ZSDX/NOPB FAQ
1.How can I place an order for LM2734ZSDX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2734ZSDX/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 LM2734ZSDX/NOPB reliable?
The price and inventory of LM2734ZSDX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2734ZSDX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2734ZSDX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2734ZSDX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2734ZSDX/NOPB?
LM2734ZSDX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2734ZSDX/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 LM2734ZSDX/NOPB?
For technical support, including LM2734ZSDX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2734ZSDX/NOPB requirements.
6.How does Aetrix verify that LM2734ZSDX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2734ZSDX/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 LM2734ZSDX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2734ZSDX/NOPB?
All LM2734ZSDX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2734ZSDX/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 LM2734ZSDX/NOPB part is unused and in its original packaging.
Return procedure for LM2734ZSDX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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