My Inquiry
My Account
Texas Instruments LM2734ZMK/NOPB
- Part No.:
- LM2734ZMK/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2734ZMK/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:3,545
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2734ZMK/NOPB from Texas Instruments (formerly National Semiconductor) is a monolithic 3 MHz PWM step-down DC-DC regulator in a 6-pin Thin SOT-23 package, featuring an internal 300 mΩ NMOS switch, 0.8 V ±2% reference, and 1 A continuous output current. It delivers local point-of-load regulation for space-constrained battery- or USB-powered systems with fast transient response and high power density.
For engineers reviewing the LM2734ZMK/NOPB datasheet, LM2734ZMK/NOPB pinout, LM2734ZMK/NOPB application, or LM2734ZMK/NOPB equivalent, key selection criteria include its fixed 3 MHz switching frequency, 3.0–20 V input range, 0.8–18 V adjustable output, 30 nA shutdown current, and current-mode control architecture enabling stable operation with minimal external components.
Technical Context
The LM2734ZMK/NOPB employs constant-frequency current-mode PWM control with internal compensation, supporting on-times as low as 13 ns to sustain 3 MHz operation across its full 3–20 V input range. Its architecture integrates a bootstrap-driven NMOS switch, pulse-by-pulse current limiting, and thermal shutdown - all optimized for compact, high-efficiency buck conversion without external loop compensation.
It uses a 0.8 V internal voltage reference with ±2% tolerance over temperature, and features undervoltage lockout (UVLO) with 2.9 V turn-on threshold and 440 mV hysteresis. The device achieves up to 85% efficiency at 1 A load (e.g., 5 VIN/3.3 VOUT) while maintaining regulation under fast load transients via fast error amplifier response and internal soft-start (200 µs ramp).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | Fixed 3 MHz - 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 automotive battery rails and industrial DC supplies. |
| Output Voltage Range | 0.8 V to 18 V - set externally via resistor divider; 0.8 V reference allows low-voltage core rail generation. |
| Max Output Current | 1 A continuous - delivered by integrated 300 mΩ NMOS switch (TSOT-6 package), reducing BOM count. |
| Shutdown Current | 30 nA - enables ultra-low-power standby in portable devices without external enable circuitry. |
| Reference Voltage | 0.800 V ±2% - ensures tight output regulation accuracy across temperature and line/load conditions. |
| Thermal Shutdown | Activates at 165°C junction temperature - protects against sustained overload or poor heatsinking. |
Pinout & Package
LM2734ZMK/NOPB is packaged in a 6-pin Thin SOT-23 (TSOT-6, NS Package Number MK06A) with exposed die attach pad (DAP) internally connected to GND. This thermally enhanced package supports high power density in minimal board area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BOOST | Bootstrap supply node | Drives NMOS gate during switch-on; requires 0.01 µF ceramic capacitor between BOOST and SW for proper gate drive voltage (>2.5 V above SW). |
| 2 - GND | Signal and power ground | Reference for feedback network and internal circuits; DAP connects here - must be soldered to large copper pour for thermal performance. |
| 3 - FB | Feedback input | High-impedance node sensing output voltage divider; trace must be short and noise-shielded to maintain regulation accuracy. |
| 4 - EN | Enable control input | Logic-high active; 1.8 V turn-on / 0.4 V turn-off thresholds; 10 nA bias current enables direct MCU GPIO control. |
| 5 - VIN | Main input supply | Accepts 3–20 V; requires local 10 µF ceramic bypass capacitor placed near pin to suppress switching noise. |
| 6 - SW | Switch node | Connects to inductor, catch diode cathode, and BOOST capacitor; high dV/dt node requiring tight layout and minimal parasitic inductance. |
Key Features
| Feature | Design Value |
|---|---|
| Internal 300 mΩ NMOS switch | Eliminates external MOSFET and driver, reducing solution size and component count for 1 A loads. |
| 3 MHz fixed-frequency PWM | Enables <3 mm × 3 mm total converter footprint using standard 1–2.2 µH shielded inductors and 10 µF MLCCs. |
| Current-mode control + internal compensation | Provides inherent cycle-by-cycle current limiting and stable operation without external compensation network. |
| 200 µs internal soft-start | Prevents inrush current during power-up, protecting input source and downstream circuitry. |
| Output overvoltage protection | Shuts off NMOS switch if FB exceeds 10% above 0.8 V reference - safeguards connected ICs from fault conditions. |
Applications
| DSL Modems | Battery-Powered Devices |
|---|---|
Use Scenario: Powering FPGA I/O banks and PHY interface logic in compact DSL modems with limited board area. IC Role / Device Role / Timing Role: Primary step-down regulator converting 12 V adapter input to 3.3 V/2.5 V rails with fast load-step response to handle burst data traffic. Use Value: 3 MHz switching minimizes inductor size, enabling full power delivery in <100 mm² footprint while maintaining >82% efficiency at 1 A. | Use Scenario: Supplying microcontroller core voltage in handheld medical monitors powered by single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Efficient buck converter stepping down 3.6–4.2 V battery voltage to 1.8 V core rail with ultra-low 30 nA shutdown current. Use Value: Enables >100-hour standby life; internal soft-start prevents brownout during cold start from depleted battery. |
| USB-Powered Devices | Automotive Infotainment |
Use Scenario: Regulating 5 V USB bus to 1.2 V for USB-C PD controller and Type-C port logic. IC Role / Device Role / Timing Role: Local point-of-load regulator with precise 0.8 V reference and tight line regulation (0.01%/V) for stable USB protocol timing. Use Value: Maintains <±1% output accuracy across full USB voltage range (4.75–5.25 V), ensuring reliable enumeration and data transfer. | Use Scenario: Generating 5 V auxiliary rail for CAN transceivers and display backlight drivers in automotive head units. IC Role / Device Role / Timing Role: Input-capable buck regulator handling 6–18 V automotive battery transients with UVLO hysteresis preventing restart oscillation. Use Value: Operates reliably across −40°C to +125°C junction range; thermal shutdown protects against engine-bay overheating. |
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 0.95 Ω HS/LS FETs; 0.6 V reference; 3.0–17 V input; 1.2 A output. | Higher integration (no external diode); lower quiescent current (17 µA); no BOOST pin required. | Preferred when synchronous rectification and lower IQ are critical; not pin-compatible - requires layout change. |
| MP2307DN-LF-Z | 340 mΩ NMOS switch; 1.2 MHz switching; 4.5–23 V input; 1.2 A output; external compensation. | Lower frequency allows larger, cheaper inductors; requires external compensation network for stability. | Selected for cost-sensitive designs where board area is less constrained and design flexibility is needed. |
Compared with TPS62130ARGTR and MP2307DN-LF-Z, LM2734ZMK/NOPB offers superior power density via 3 MHz operation and integrated bootstrap circuitry, but requires an external Schottky diode and lacks synchronous rectification - making it optimal for space-limited, medium-efficiency applications where simplicity and known thermal behavior are prioritized.
Availability
LM2734ZMK/NOPB is available at Aetrix Electronics and suitable for DSL modems, battery-powered medical devices, USB-C peripherals, automotive infotainment modules, and industrial point-of-load systems requiring stable component supply with long-term manufacturability.
Supply support for LM2734ZMK/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 analog power portfolio with rigorous qualification and long-term product support.
The LM2734Z series belongs to TI's high-frequency monolithic buck regulator family, designed specifically for compact, efficient local DC/DC conversion in space- and thermal-constrained applications such as portable electronics and automotive subsystems.
FAQ
What is the recommended inductor value for LM2734ZMK/NOPB in a 5 VIN/3.3 VOUT @ 1 A application?
For LM2734ZMK/NOPB operating at 3 MHz with 5 V input and 3.3 V output delivering 1 A, a 2.2 µH shielded ferrite inductor is recommended. This value balances ripple current (~0.4 A peak-to-peak), size, and efficiency - verified in TI's typical application circuit. Inductor saturation current must exceed 1.25 A to accommodate peak inductor current under full load.
Does LM2734ZMK/NOPB require an external Schottky diode, and why?
Yes, LM2734ZMK/NOPB requires an external Schottky diode (e.g., RB050M-30 or similar) connected from SW to GND. Because it uses an asynchronous architecture with only an internal NMOS switch, the diode provides the freewheeling path during switch-off time. A low-VF Schottky minimizes conduction loss and improves efficiency - especially critical at higher output currents.
Can LM2734ZMK/NOPB operate with input voltage below 3 V?
No, LM2734ZMK/NOPB has a guaranteed operating input range of 3.0 V to 20 V per its Absolute Maximum and Operating Ratings. Below 3 V, undervoltage lockout activates (UVLO turn-on threshold is 2.9 V typ), preventing regulation. Attempting operation below 3 V risks unstable startup or failure to regulate - it is not characterized or supported for sub-3 V inputs.
What is the purpose of the BOOST pin on LM2734ZMK/NOPB, and how is it configured?
The BOOST pin on LM2734ZMK/NOPB supplies gate drive voltage to the internal NMOS switch via a bootstrap capacitor (typically 0.01 µF X7R ceramic) connected between BOOST and SW. During switch-off, VIN charges the capacitor through an external diode; during switch-on, the capacitor elevates BOOST above SW to ensure sufficient VGS (>2.5 V) for low RDS(ON) operation - critical for efficiency at high duty cycles.
Is LM2734ZMK/NOPB qualified for automotive applications?
No - LM2734ZMK/NOPB is not AEC-Q100 qualified. Only the LM2734ZQ variants (e.g., LM2734ZQMK) carry AEC-Q100 Grade 1 qualification and undergo automotive-grade manufacturing flow. LM2734ZMK/NOPB is intended for commercial and industrial applications; for automotive use, select the Q-suffix variant and verify compliance with TI's automotive documentation for LM2734ZQ.
LM2734ZMK/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- 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:
- SOT-23-THIN
LM2734ZMK/NOPB FAQ
1.How can I place an order for LM2734ZMK/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2734ZMK/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 LM2734ZMK/NOPB reliable?
The price and inventory of LM2734ZMK/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2734ZMK/NOPB is usually 5 days.
3.What payment methods are accepted for LM2734ZMK/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2734ZMK/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2734ZMK/NOPB?
LM2734ZMK/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2734ZMK/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 LM2734ZMK/NOPB?
For technical support, including LM2734ZMK/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2734ZMK/NOPB requirements.
6.How does Aetrix verify that LM2734ZMK/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2734ZMK/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 LM2734ZMK/NOPB meets industry standards.
7.What is the process for return or replacement of LM2734ZMK/NOPB?
All LM2734ZMK/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2734ZMK/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 LM2734ZMK/NOPB part is unused and in its original packaging.
Return procedure for LM2734ZMK/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2734ZMK/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…
