My Inquiry
My Account
Texas Instruments LM2734YMK/NOPB
- Part No.:
- LM2734YMK/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2734YMK/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:73,601
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2734YMK/NOPB from Texas Instruments is a monolithic, current-mode PWM step-down DC/DC regulator in a 6-pin Thin SOT-23 package, delivering 1-A output current with 550-kHz fixed switching frequency, 0.8-V internal reference (±2%), and 300-mΩ NMOS switch. It operates across 3-V to 20-V input and supports 0.8-V to 18-V adjustable output voltage-ideal for point-of-load regulation in space-constrained USB-powered devices.
For engineers reviewing the LM2734YMK/NOPB datasheet, LM2734YMK/NOPB pinout, LM2734YMK/NOPB application, or LM2734YMK/NOPB equivalent, key selection criteria include verified 550-kHz switching frequency, confirmed 30-nA shutdown current, validated thermal shutdown at 165°C, and documented boost-capacitor bootstrap operation requiring external diode and capacitor.
Technical Context
The LM2734YMK/NOPB implements constant-frequency current-mode control with internal compensation, enabling stable regulation without external loop components. 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 undervoltage lockout (2.74-V turn-on, 2.3-V turn-off with 440-mV hysteresis), cycle-by-cycle current limiting (1.7-A typical), and output overvoltage protection (10% above VFB). The BOOST pin requires external bootstrap capacitor and diode to generate gate drive ≥2.5 V above SW for optimal NMOS conduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 550 kHz - enables use of small 4.7-µH inductors and ceramic capacitors, minimizing PCB footprint. |
| Output Current | 1 A - supports core power delivery for HDDs, set-top boxes, and notebook subsystems without external pass devices. |
| Input Voltage Range | 3 V to 20 V - accommodates wide-input applications including automotive battery-supplied systems and industrial 12-V rails. |
| Feedback Reference | 0.8 V ±2% - sets output via resistor divider; enables precise 1.5-V, 1.8-V, 3.3-V, or 5-V regulation with <±1% total error over temp. |
| Shutdown Current | 30 nA - ensures ultra-low system standby power, critical for battery-backed USB peripherals and portable devices. |
| Internal NMOS RDS(ON) | 300 mΩ - limits conduction loss at 1-A load to ≤300 mW, supporting >90% efficiency at 5-VIN/3.3-VOUT. |
| Thermal Shutdown | 165°C - protects against sustained overload or poor heatsinking; auto-recovery at ~150°C prevents latch-up. |
Pinout & Package
Package: SOT-23-THIN (DDC), 2.90 mm × 1.60 mm body size, 0.95-mm height - optimized for high-density layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pin 1) | Bootstrap supply input | Drives NMOS gate; requires external 0.01-µF ceramic capacitor to SW and Schottky diode from VIN or VOUT - insufficient voltage causes dropout under load. |
| GND (Pin 2) | Signal and power ground | Reference for FB divider and internal circuits; bottom resistor of feedback network must be placed adjacent to minimize noise-induced regulation error. |
| FB (Pin 3) | Voltage feedback input | Compares divided output to 0.8-V internal reference; open-circuit or >3-V input disables regulation and may damage internal comparator. |
| EN (Pin 4) | Enable control | Logic-high (>1.8 V) enables operation; logic-low (<0.4 V) forces 30-nA shutdown - floating state causes unpredictable behavior. |
| VIN (Pin 5) | Main power input | Supplies internal circuitry and switch; requires local 10-µF X5R ceramic bypass capacitor within 3 mm to suppress high-frequency ripple. |
| SW (Pin 6) | Switch node output | Connects to inductor, catch diode anode, and BOOST capacitor; high dv/dt demands tight layout to minimize EMI and shoot-through risk. |
Key Features
| Feature | Design Value |
|---|---|
| Internal soft-start | Ramps VFB reference from 0 V to 0.8 V over ~200 µs - limits inrush current during startup without external timing components. |
| Current-mode PWM control | Provides inherent cycle-by-cycle current limiting and fast transient response - eliminates need for external compensation network. |
| Output overvoltage protection | Shuts off NMOS switch when FB exceeds 0.88 V (10% above VREF) - prevents damage to downstream 3.3-V or 1.8-V logic during feedback divider failure. |
| Undervoltage lockout | Enables only when VIN ≥2.74 V and disables below 2.3 V - avoids brownout operation and ensures clean power-up sequencing. |
| Thermal shutdown with hysteresis | Disables switching at 165°C junction temperature and resumes at ~150°C - prevents thermal runaway while allowing recovery after brief overload. |
Applications
| Local Point-of-Load Regulation | USB-Powered Devices |
|---|---|
Use Scenario: Regulating 5-V USB bus to 1.8-V or 3.3-V for microcontroller I/O or sensor interface on compact PCBs. IC Role / Device Role / Timing Role: Primary buck converter providing tightly regulated, low-noise DC supply with fast load-step response. Use Value: 550-kHz switching allows <2-mm² solution size; 30-nA shutdown extends battery life in USB-C accessories. | Use Scenario: Powering FPGA configuration circuitry or USB hub controller from single 5-V upstream port. IC Role / Device Role / Timing Role: High-efficiency step-down regulator delivering stable 1.2-V core voltage with minimal thermal rise. Use Value: 300-mΩ RDS(ON) and internal compensation reduce BOM count by 3 components versus discrete solutions. |
| Notebook Computers | DSL Modems |
Use Scenario: Generating 1.5-V DDR memory supply from 12-V main rail in ultraportable notebooks. IC Role / Device Role / Timing Role: Secondary DC/DC converter handling dynamic load transients up to 1-A with <50-µs recovery. Use Value: 13-ns minimum on-time supports 1.5-V output at 12-V input (D ≈ 12.5%), avoiding pulse-skipping instability. | Use Scenario: Providing isolated 3.3-V analog front-end supply in DSL line card with strict EMI limits. IC Role / Device Role / Timing Role: Compact, low-EMI buck regulator meeting EN55022 Class B conducted emissions without shielding. Use Value: Fixed 550-kHz frequency simplifies EMI filter design; Thin SOT-23 package minimizes board area in multi-rail designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2734XMK/NOPB | 1.6-MHz switching frequency, higher quiescent current (2.5 mA vs 1.5 mA), same package and pinout. | Better suited for ultra-compact designs needing smaller inductors; less efficient at light loads due to higher switching loss. | Select LM2734XMK/NOPB when board space is constrained and 1.6-MHz operation is acceptable; LM2734YMK/NOPB preferred for efficiency-critical 550-kHz designs. |
| TPS62231DRVR | 3-MHz fixed frequency, 0.6-V reference, 600-mA output, 1.5-mm × 1.5-mm WSON package - not pin-compatible. | Targets lower-current, higher-frequency applications; lacks BOOST pin and requires different external component topology. | Choose TPS62231DRVR only for new designs where 600-mA output suffices and 3-MHz operation aligns with system clocking; not a drop-in replacement. |
Compared with LM2734XMK/NOPB, the LM2734YMK/NOPB trades higher-frequency capability for improved light-load efficiency and lower EMI fundamental; versus TPS62231DRVR, it offers 1-A output and bootstrap-based high-side drive but requires more external components and occupies larger area.
Availability
LM2734YMK/NOPB is available at Aetrix Electronics and suitable for local point-of-load regulation, USB-powered devices, and DSL modem power supplies requiring stable component supply, long-term lifecycle support, and TI-qualified production lots.
Supply support for LM2734YMK/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 is a global semiconductor company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management ICs for industrial, automotive, and consumer markets.
The LM2734YMK/NOPB belongs to TI's high-frequency buck regulator product line, engineered for minimal PCB area and fast transient response in space-constrained, battery-sensitive applications such as portable electronics and communications infrastructure.
FAQ
What is the maximum input voltage rating for the LM2734YMK/NOPB?
The LM2734YMK/NOPB has an absolute maximum input voltage rating of 24 V, but its recommended operating range is 3 V to 20 V. Exceeding 20 V continuously risks exceeding thermal limits or violating safe operating area margins, especially at high duty cycles. The device includes undervoltage lockout that activates below 2.74 V and deactivates at 2.3 V to prevent unstable operation near rail extremes.
Does the LM2734YMK/NOPB require an external bootstrap diode and capacitor?
Yes, the LM2734YMK/NOPB requires both an external bootstrap diode (e.g., 1N4148W) and capacitor (typically 0.01 µF X7R) connected between BOOST and SW pins. This network generates the gate-drive voltage needed for the internal 300-mΩ NMOS switch. Omitting either component results in insufficient gate drive, causing excessive RDS(ON), thermal stress, and potential failure under 1-A load.
How does the LM2734YMK/NOPB achieve output voltage regulation?
The LM2734YMK/NOPB regulates output voltage using a precision 0.8-V internal reference and feedback amplifier. The FB pin senses a resistor divider from VOUT; the error amplifier compares this to 0.8 V and adjusts PWM duty cycle via current-mode control. This closed-loop system maintains ±2% reference accuracy and achieves <±1% total output error across line, load, and temperature - no external compensation components are required.
What thermal protection features are integrated into the LM2734YMK/NOPB?
The LM2734YMK/NOPB integrates thermal shutdown that disables the internal NMOS switch when junction temperature exceeds 165°C. After shutdown, the device remains off until temperature drops to approximately 150°C, providing hysteresis to prevent oscillation. Its SOT-23-THIN package has a junction-to-board thermal resistance (RθJB) of 29.5°C/W, enabling reliable 1-A operation on standard 2-layer PCBs with adequate copper pour.
Can the LM2734YMK/NOPB be used in automotive applications?
The LM2734YMK/NOPB is not qualified for automotive AEC-Q100 applications. While its 3–20-V input range covers typical 12-V vehicle batteries, TI moved automotive-specific content to a separate datasheet (SNVSB80) and removed automotive references from the LM2734 SNVS288K revision history. For automotive use, designers must select TI's automotive-grade alternatives such as the LM61480-Q1 or TPS54360B-Q1.
LM2734YMK/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:
- 550kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
LM2734YMK/NOPB FAQ
1.How can I place an order for LM2734YMK/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2734YMK/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 LM2734YMK/NOPB reliable?
The price and inventory of LM2734YMK/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2734YMK/NOPB is usually 5 days.
3.What payment methods are accepted for LM2734YMK/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2734YMK/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2734YMK/NOPB?
LM2734YMK/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2734YMK/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 LM2734YMK/NOPB?
For technical support, including LM2734YMK/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2734YMK/NOPB requirements.
6.How does Aetrix verify that LM2734YMK/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2734YMK/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 LM2734YMK/NOPB meets industry standards.
7.What is the process for return or replacement of LM2734YMK/NOPB?
All LM2734YMK/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2734YMK/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 LM2734YMK/NOPB part is unused and in its original packaging.
Return procedure for LM2734YMK/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2734YMK/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…
