My Inquiry
My Account
Texas Instruments LM2734ZSD/NOPB
- Part No.:
- LM2734ZSD/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LM2734ZSD/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,182
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2734ZSD/NOPB from Texas Instruments (formerly National Semiconductor) is a monolithic 3 MHz PWM step-down DC-DC regulator in a 6-lead LLP (3mm × 3mm) package, featuring an internal 340 mΩ NMOS switch, 1 A output current capability, 0.8 V ±2% reference, and 30 nA shutdown current. It delivers point-of-load regulation for compact battery- or USB-powered systems requiring fast transient response and minimal PCB area.
For engineers reviewing the LM2734ZSD/NOPB datasheet, LM2734ZSD/NOPB pinout, LM2734ZSD/NOPB application, or LM2734ZSD/NOPB equivalent, key selection criteria include its fixed 3 MHz switching frequency, internal compensation, current-mode control architecture, thermal shutdown, and output overvoltage protection - all critical for space-constrained, efficiency-sensitive power designs.
Technical Context
The LM2734ZSD/NOPB employs current-mode PWM control with internal compensation, enabling stable regulation across 3 V–20 V input and 0.8 V–18 V output ranges without external loop components. Its 13 ns minimum on-time supports high-frequency operation down to low duty cycles, essential for wide VIN/VOUT ratios.
It integrates soft-start (200 µs ramp), undervoltage lockout (2.74 V rising threshold, 440 mV hysteresis), cycle-by-cycle current limit (1.7 A typical), and thermal shutdown (165 °C trip). The BOOST pin requires external bootstrap capacitor and diode to sustain ≥2.5 V gate drive above SW for optimal NMOS conduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | Fixed 3 MHz - enables use of sub-2.2 µH inductors and 10 µF ceramic output capacitors, minimizing solution size. |
| Input Voltage Range | 3 V to 20 V - supports wide-input industrial, automotive, and adapter-fed applications without pre-regulation. |
| Output Voltage Range | 0.8 V to 18 V - set via external resistor divider; 0.8 V reference with ±2% accuracy ensures tight load regulation. |
| Max Output Current | 1 A continuous - delivered using integrated 340 mΩ NMOS switch (LLP package), reducing BOM count and layout complexity. |
| Shutdown Current | 30 nA - enables ultra-low-power standby in portable devices; EN pin logic-high enables operation. |
| Thermal Protection | Junction shutdown at 165 °C with 15 °C hysteresis - prevents damage during overload or poor heatsinking; DAP tied to GND enhances thermal dissipation. |
| Current Limit | 1.2 A min / 1.7 A typ - pulse-by-pulse limiting protects switch under short-circuit or heavy transient loads. |
Pinout & Package
LM2734ZSD/NOPB is housed in a thermally enhanced 6-lead LLP package (3 mm × 3 mm, NS Package Number SDE06A) with an exposed Die Attach Pad (DAP) internally connected to GND for improved thermal performance and EMI reduction.
| 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 overdrive during high-duty-cycle operation. |
| 2 - GND | Signal and power ground | Reference for FB, EN, and internal circuits; DAP connects here - must be soldered to large GND plane with ≥4 thermal vias for thermal management. |
| 3 - FB | Feedback input | High-impedance (≤250 nA bias) node monitoring output via resistor divider; trace must be short and远离 noisy nodes to avoid regulation error. |
| 4 - EN | Enable control input | Logic-compatible enable: <0.4 V disables (30 nA IQ), >1.8 V enables; 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 placed adjacent to pin with low-ESL layout. |
| 6 - SW | Switch node | Connects to inductor, catch diode cathode, and BOOST capacitor; high dv/dt node - minimize trace area to reduce EMI and ringing. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Compensation | Eliminates need for external compensation network - simplifies design, reduces component count, and ensures stability across full load/line/temp range. |
| 3 MHz Fixed Frequency | Enables use of miniature 1–2.2 µH shielded inductors and low-ESR ceramic capacitors - cuts total solution footprint by >40% vs 500 kHz regulators. |
| Integrated Soft-Start | 200 µs controlled VOUT ramp - limits inrush current into output capacitance, preventing input rail sag and system brownout during power-up. |
| Output Overvoltage Protection | Shuts off NMOS when FB exceeds 10% above 0.8 V reference - safeguards downstream ICs from fault-induced overvoltage events. |
| Thermally Optimized LLP | Exposed DAP with GND connection achieves θJA ≈ 60 °C/W on 4-layer board - sustains 1 A load at TA = 85 °C without forced air. |
Applications
| DSL Modems | USB-Powered Devices |
|---|---|
Use Scenario: Powering FPGA I/O banks and PHY transceivers in compact DSL line cards where board space is constrained and input is derived from 12 V wall adapter. IC Role / Device Role / Timing Role: Primary point-of-load regulator converting 12 V to 3.3 V/1.8 V with fast load-step response to handle bursty data transmission. Use Value: 3 MHz switching minimizes inductor size (<2.2 µH) and eliminates need for bulky electrolytic capacitors - critical for fanless, sealed modem enclosures. | Use Scenario: Generating 3.3 V rail from USB 5 V bus for portable test equipment with real-time sensor interface and BLE radio. IC Role / Device Role / Timing Role: Efficient buck converter delivering regulated 3.3 V at up to 1 A while maintaining <30 nA quiescent current in sleep mode. Use Value: Ultra-low shutdown current extends battery life; internal soft-start prevents USB port overcurrent trips during plug-in events. |
| Battery-Powered Devices | Automotive Infotainment |
Use Scenario: Supplying 1.2 V core voltage to ARM Cortex-M4 microcontroller in handheld medical monitor powered by two Li-ion cells (6–8.4 V). IC Role / Device Role / Timing Role: High-efficiency step-down regulator supporting dynamic voltage scaling and rapid wake-from-sleep transitions. Use Value: 85% peak efficiency at 500 mA load preserves battery runtime; thermal shutdown protects against enclosure overheating during extended operation. | Use Scenario: Local 5 V supply for CAN transceiver and display backlight driver in automotive head unit operating from 9–16 V battery rail. IC Role / Device Role / Timing Role: Robust buck converter qualified per AEC-Q100 Grade 1 (LM2734ZQ variant); LM2734ZSD/NOPB used in non-safety-critical subsystems. Use Value: Wide 3–20 V input range accommodates cold-crank (6.5 V) and load-dump (20 V) transients; UVLO hysteresis prevents oscillation during unstable ignition sequences. |
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, 2.7–6 V input, integrated FETs, 12 µA IQ in PWM mode | Higher current, narrower input range - suited for single-cell Li-ion systems only | Select when >1 A load or tighter input range (e.g., 3.3 V system rail) is required; not drop-in due to different pinout and enable polarity. |
| RT8059GJ6 | 1.5 MHz, 2 A output, 2.5–5.5 V input, 25 µA IQ, no internal soft-start | Lower frequency, higher current, lower IQ - optimized for ultra-portable wearables | Choose for cost-sensitive, low-IQ applications where 1.5 MHz allows larger inductors; requires external soft-start circuit if inrush control is needed. |
Compared with TPS62130ARGTR and RT8059GJ6, LM2734ZSD/NOPB offers broader 3–20 V input compatibility and proven thermal performance in LLP packaging - making it preferred for industrial and multi-rail adapter-powered designs where input voltage variability and board-area constraints dominate.
Availability
LM2734ZSD/NOPB is available at Aetrix Electronics and suitable for DSL modems, USB-powered instrumentation, and battery-operated medical devices requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2734ZSD/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, and WEBENCH® design tool support.
The LM2734Z series was designed for space-constrained, high-frequency point-of-load conversion in consumer, industrial, and automotive electronics - emphasizing minimal external components, fast transient response, and robust protection features.
FAQ
What is the recommended inductor value for LM2734ZSD/NOPB in a 5 V to 3.3 V, 1 A application?
For LM2734ZSD/NOPB operating at 3 MHz with 5 V input and 3.3 V output, a 1.5 µH shielded ferrite inductor rated for ≥1.25 A saturation current is recommended. This value balances ripple current (~0.4 A peak-to-peak), efficiency (>85%), and physical size. TI's WEBENCH® tool confirms 1.5 µH yields optimal transient response and thermal performance for this configuration.
Does LM2734ZSD/NOPB require an external catch diode?
Yes, LM2734ZSD/NOPB requires an external Schottky catch diode (e.g., RB055LAM-40) connected between SW and GND. The IC lacks synchronous rectification; the diode conducts during the NMOS off-time to maintain inductor current continuity. Diode selection must meet ≥1 A average current, ≤0.4 V forward voltage, and ≥20 V reverse rating for reliable operation.
Can LM2734ZSD/NOPB operate with input voltage below 3 V?
No, LM2734ZSD/NOPB has a guaranteed operating input range of 3 V to 20 V per its Absolute Maximum and Operating Ratings. Input below 3 V triggers undervoltage lockout (UVLO), disabling switching. The UVLO rising threshold is 2.74 V typical, but operation is not characterized or warranted below 3 V - use LM2734ZQ variants only for automotive cold-crank validation.
How is thermal performance affected by the DAP connection on LM2734ZSD/NOPB?
The DAP on LM2734ZSD/NOPB is internally tied to GND and must be soldered to a dedicated thermal pad on the PCB with ≥4 thermal vias to an inner GND plane. Without this, θJA degrades from ~60 °C/W to >100 °C/W, risking thermal shutdown at 1 A load above 60 °C ambient. Proper DAP grounding reduces junction temperature rise by up to 45 °C under full load.
Is LM2734ZSD/NOPB pin-compatible with LM2734ZMK (TSOT-23-6)?
No, LM2734ZSD/NOPB (6-lead LLP) and LM2734ZMK (6-lead TSOT-23) share identical pin functions but differ in physical layout, thermal pad presence, and package dimensions. The LLP exposes a DAP requiring PCB thermal relief, while TSOT-23 has no exposed pad. They are functionally equivalent but not mechanically interchangeable - redesign of footprint and thermal layout is required for substitution.
LM2734ZSD/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- 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:
- 3MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WSON (3x3)
LM2734ZSD/NOPB FAQ
1.How can I place an order for LM2734ZSD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2734ZSD/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 LM2734ZSD/NOPB reliable?
The price and inventory of LM2734ZSD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2734ZSD/NOPB is usually 5 days.
3.What payment methods are accepted for LM2734ZSD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2734ZSD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2734ZSD/NOPB?
LM2734ZSD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2734ZSD/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 LM2734ZSD/NOPB?
For technical support, including LM2734ZSD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2734ZSD/NOPB requirements.
6.How does Aetrix verify that LM2734ZSD/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2734ZSD/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 LM2734ZSD/NOPB meets industry standards.
7.What is the process for return or replacement of LM2734ZSD/NOPB?
All LM2734ZSD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2734ZSD/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 LM2734ZSD/NOPB part is unused and in its original packaging.
Return procedure for LM2734ZSD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2734ZSD/NOPB Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
