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Texas Instruments LM2734ZSD
- Part No.:
- LM2734ZSD
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LM2734ZSD.pdf
- Description:
- IC REG BUCK ADJ 1A 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,342
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Product details
Overview
LM2734ZSD 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 integrated 340 mΩ NMOS switch, 0.8 V ±2% internal reference, and 1 A continuous output current capability. It delivers local point-of-load regulation for space-constrained battery- and USB-powered systems with fast transient response and minimal external components.
For engineers reviewing the LM2734ZSD datasheet, LM2734ZSD pinout, LM2734ZSD application, or LM2734ZSD equivalent, key selection considerations include its 3.0–20 V input range, 0.8–18 V adjustable output, 30 nA shutdown current, current-mode control architecture, and thermal/overvoltage protections - all critical for compact, high-efficiency buck converter design.
Technical Context
The LM2734ZSD employs fixed-frequency current-mode PWM control with internal compensation, enabling stable regulation across wide input/output ranges without external loop compensation. Its 3 MHz switching frequency supports ultra-small inductors (e.g., 2.2 µH) and ceramic capacitors while maintaining <13 ns minimum on-time for low-duty-cycle operation down to 0.8 V output.
It integrates cycle-by-cycle current limiting (1.2–2.5 A typ), thermal shutdown (165°C trip), output overvoltage protection (10% above VFB), and internal soft-start (~200 µs ramp). The BOOST pin requires external bootstrap capacitor and diode to sustain ≥2.5 V gate drive margin over SW, with VBOOST–VSW constrained between 1.6 V and 5.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 3 MHz (internally fixed; enables use of sub-3 mm inductors and chip-scale ceramics) |
| Input Voltage Range | 3.0 V to 20 V (supports wide-input industrial/battery/USB applications) |
| Output Voltage Range | 0.8 V to 18 V (adjustable via resistor divider; 0.8 V ±2% internal reference) |
| Max Output Current | 1 A continuous (limited by internal 340 mΩ NMOS switch in LLP package) |
| Shutdown Current | 30 nA (ultra-low quiescent draw enables long battery life in standby) |
| Feedback Reference | 0.800 V ±16 mV (2% tolerance; sets output accuracy and line/load regulation baseline) |
| Current Limit Threshold | 1.7 A typical (cycle-by-cycle protection prevents switch damage under overload) |
| Operating Junction Temp | −40°C to +125°C (qualified for extended industrial and automotive environments) |
Pinout & Package
The LM2734ZSD is housed in a 6-lead LLP package (3 mm × 3 mm, NS Package Number SDE06A) with an exposed die attach pad (DAP) internally connected to GND for enhanced thermal performance. PCB layout requires ≥4 thermal vias under the DAP to ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BOOST | Bootstrap voltage supply | Drives NMOS gate; requires external 0.01 µF ceramic capacitor to SW; VBOOST–VSW must be 1.6–5.5 V for reliable switching |
| 2 - GND | Signal and power ground | Reference for FB divider and internal circuits; bottom resistor of feedback network must connect here for regulation accuracy |
| 3 - FB | Feedback input | High-impedance node (10–250 nA bias); senses output via resistor divider; sensitive to noise - trace must be short and shielded |
| 4 - EN | Enable control | 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 4.7–10 µF low-ESL ceramic bypass capacitor near pin |
| 6 - SW | Switch node | Connects to inductor, catch diode cathode, and BOOST capacitor; carries high dI/dt - minimize trace length and loop area |
| DAP | Die Attach Pad | Internally tied to GND; mandatory thermal path - must be soldered to solid ground plane with ≥4 thermal vias |
Key Features
| Feature | Design Value |
|---|---|
| 3 MHz fixed-frequency PWM | Enables <3 mm inductors and eliminates audible noise; supports >90% duty cycle at low VOUT/VIN ratios |
| Internal 340 mΩ NMOS switch (LLP) | Reduces conduction loss vs TSOT-6 variant (300 mΩ); optimized for thermal dissipation in 3×3 mm footprint |
| Current-mode control + internal compensation | Eliminates need for external compensation network; ensures stability with wide range of output capacitors (≥10 µF ceramic) |
| Integrated soft-start (~200 µs) | Controls output ramp rate to limit inrush current into bulk capacitance and downstream circuitry |
| Output overvoltage protection | Disables switch when FB exceeds 10% above 0.8 V reference - protects load during feedback fault or divider open |
| Ultra-low 30 nA shutdown current | Extends battery runtime in portable devices; enables host-controlled power gating without auxiliary LDOs |
Applications
| DSL Modem Power Supply | USB-Powered IoT Sensor Node |
|---|---|
Use Scenario: Provides clean 3.3 V rail from 5 V USB input to power DSL line driver ICs and PHY layers. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 3.3 V @ 1 A with <100 µs transient recovery. Use Value: 3 MHz switching minimizes EMI coupling into sensitive analog line interfaces; 30 nA shutdown extends modem standby time. |
Use Scenario: Powers ultra-low-power microcontroller, BLE radio, and environmental sensors from single USB port. IC Role / Device Role / Timing Role: Local point-of-load regulator converting 5 V USB to 1.8 V or 2.5 V system rail with dynamic enable control. Use Value: Internal soft-start prevents brownout during sensor wake-up bursts; 125°C junction rating supports enclosed enclosure operation. |
| Automotive Infotainment Display | Industrial Handheld Terminal |
Use Scenario: Generates 5 V or 12 V auxiliary rail from 12 V vehicle battery for LCD backlight drivers and touch controller. IC Role / Device Role / Timing Role: High-input buck converter handling cold-crank (6 V) to load-dump (20 V) transients per ISO 7637-2. Use Value: 20 V max input and thermal shutdown protect against automotive voltage surges; LLP package withstands vibration stress. |
Use Scenario: Supplies 3.3 V main logic rail from 7.4 V Li-ion battery pack in ruggedized field terminal. IC Role / Device Role / Timing Role: Efficient step-down regulator operating across full battery discharge curve (8.4 V → 6.0 V). Use Value: 85% peak efficiency at 1 A reduces thermal load in sealed housing; undervoltage lockout (2.74 V) prevents erratic MCU behavior. |
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, 3–17 V input, 1.2–6.5 V fixed/adj output, 3.5 A capability, 17 µA quiescent current | Higher current, lower IQ, but no OVP or UVLO hysteresis; requires external compensation | Preferred for higher-current, lower-quiescent designs where OVP is handled externally |
| MP2307DN-LF-Z | 340 kHz, 4.75–23 V input, 0.925–15 V adj output, 3 A, 100 µA shutdown current, no internal soft-start | Lower frequency → larger magnetics; higher shutdown current; lacks OVP and precise reference | Suitable for cost-sensitive, non-battery applications where size and ultra-low IQ are secondary |
Compared with LM2734ZSD, TPS62130ARGTR offers higher output current and lower operating IQ but sacrifices integrated protections and ease-of-use; MP2307DN-LF-Z trades switching speed and feature set for cost and voltage range flexibility - making LM2734ZSD optimal for compact, protected, battery-aware 1 A point-of-load conversion.
Availability
LM2734ZSD is available at Aetrix Electronics and suitable for DSL modems, USB-powered IoT nodes, automotive infotainment displays, and industrial handheld terminals requiring stable component supply, automotive-grade reliability, and compact DC-DC integration.
Supply support for LM2734ZSD 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 datasheet, simulation, and WEBENCH® design support.
The LM2734Z series was designed for space-constrained, high-frequency point-of-load regulation in consumer, industrial, and automotive systems - emphasizing minimal external components, thermal robustness, and fast transient response.
FAQ
What is the recommended inductor value for LM2734ZSD in a 5 V to 3.3 V, 1 A application?
For LM2734ZSD operating at 3 MHz with 5 V input and 3.3 V output, a 2.2 µH shielded ferrite inductor rated for ≥1.25 A saturation current is recommended. This value balances ripple current (~0.35 A peak-to-peak), size, and efficiency - consistent with TI's reference design and typical performance curves. Ensure DCR is <75 mΩ to minimize conduction loss.
Does LM2734ZSD require an external catch diode, and what type is recommended?
Yes, LM2734ZSD requires an external Schottky catch diode (D1) connected from SW to GND. A BAT54 or similar low-VF (≤0.4 V), 2 A rated Schottky diode is recommended to minimize conduction loss and improve efficiency - especially critical at high duty cycles. The diode's reverse voltage rating must exceed maximum input voltage plus margin (e.g., 25 V for 20 V max input).
Can LM2734ZSD operate with input voltage below 3 V, and what happens if VIN drops below UVLO threshold?
No, LM2734ZSD cannot operate below its 2.74 V (typ) undervoltage lockout (UVLO) rising threshold. If VIN falls below ~2.3 V (UVLO falling threshold), the device disables switching and enters low-power state with 30 nA shutdown current. Operation below 3 V violates Absolute Maximum Ratings and may cause erratic regulation or failure to start - it is not supported across temperature or process corners.
How does the BOOST capacitor function in LM2734ZSD, and what value is required?
The BOOST capacitor (0.01 µF X7R/X5R ceramic, ≥6.3 V rating) forms a charge pump with the internal NMOS gate driver to maintain sufficient VGS during high-side switch conduction. It connects between BOOST and SW pins and must be placed adjacent to the IC. Insufficient capacitance or poor placement causes gate drive collapse, leading to excessive RDS(on) loss and thermal shutdown - verified in TI's layout guidelines and thermal testing.
Is LM2734ZSD pin-compatible with LM2734ZMK (TSOT-6) or LM2734ZQ variants?
No, LM2734ZSD is not pin-compatible with LM2734ZMK (TSOT-6) or LM2734ZQ variants. While all share identical pin functions and signal assignments, the LLP (SDE06A) and TSOT-6 (MK06A) packages have different footprints, thermal pad configurations, and mechanical dimensions. LM2734ZQ adds AEC-Q100 Grade 1 qualification but retains same pinout - board redesign is required to migrate between package types.
LM2734ZSD 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)
LM2734ZSD FAQ
1.How can I place an order for LM2734ZSD through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2734ZSD 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 LM2734ZSD reliable?
The price and inventory of LM2734ZSD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2734ZSD is usually 5 days.
3.What payment methods are accepted for LM2734ZSD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2734ZSD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2734ZSD?
LM2734ZSD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2734ZSD 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 LM2734ZSD?
For technical support, including LM2734ZSD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2734ZSD requirements.
6.How does Aetrix verify that LM2734ZSD is sourced from the original manufacturer or authorized distributors?
All LM2734ZSD 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 LM2734ZSD meets industry standards.
7.What is the process for return or replacement of LM2734ZSD?
All LM2734ZSD units undergo pre-shipment inspection (PSI). If there is an issue with LM2734ZSD, 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 LM2734ZSD part is unused and in its original packaging.
Return procedure for LM2734ZSD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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