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Texas Instruments LM2734ZMK
- Part No.:
- LM2734ZMK
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2734ZMK.pdf
- Description:
- IC REG BUCK ADJ 1A SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,094
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Product details
Overview
LM2734ZMK from Texas Instruments (formerly National Semiconductor) is a monolithic 3 MHz PWM step-down DC-DC regulator in a 6-pin Thin SOT-23 (TSOT-6) package, delivering up to 1 A output current with internal 300 mΩ NMOS switch, 0.8 V ±2% reference, and 30 nA shutdown current. It operates from 3 V to 20 V input and supports 0.8 V to 18 V adjustable output voltage, targeting space-constrained point-of-load regulation in DSL modems and USB-powered devices.
For engineers reviewing the LM2734ZMK datasheet, LM2734ZMK pinout, LM2734ZMK application, or LM2734ZMK equivalent, key selection criteria include its fixed 3 MHz switching frequency, current-mode control architecture, internal soft-start, thermal shutdown, and output overvoltage protection - all validated for operation across −40°C to +125°C junction temperature range.
Technical Context
The LM2734ZMK uses constant-frequency current-mode PWM control with internal compensation, enabling stable regulation without external loop components. Its 13 ns minimum on-time supports high duty-cycle operation down to 0.8 V output even at 20 V input, while the 3 MHz oscillator allows use of sub-3 mm inductors and ceramic capacitors.
It integrates a bootstrap-driven NMOS power switch, undervoltage lockout (2.74 V rising threshold), cycle-by-cycle current limit (1.7 A typical), and an enable pin with 0.4 V shutdown threshold and 10 nA bias current - all implemented in 0.5 µm BiCMOS process for high power density in TSOT-6.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | Fixed 3 MHz - enables use of ultra-small surface-mount inductors (e.g., 2.2 µH) and chip capacitors without compromising transient response. |
| Input Voltage Range | 3 V to 20 V - supports wide-input industrial and USB-powered applications without external pre-regulation. |
| Output Voltage Range | 0.8 V to 18 V - adjustable via external resistor divider; 0.8 V reference with ±2% tolerance ensures tight output accuracy. |
| Max Output Current | 1 A - delivered using integrated 300 mΩ NMOS switch (TSOT-6 package), eliminating need for external MOSFET. |
| Shutdown Current | 30 nA - ultra-low quiescent draw in disable mode, critical for battery-backed systems. |
| Junction Temp Range | −40°C to +125°C - qualified for extended industrial and automotive-adjacent environments. |
| Thermal Resistance θJA | 118°C/W - defined for TSOT-6 on 3" × 3" 4-layer PCB with 2 oz copper; informs heatsinking requirements for 1 A loads. |
Pinout & Package
LM2734ZMK is packaged in NSC TSOT-6 (MK06A), a 6-pin Thin SOT-23 with exposed die attach pad (DAP) internally connected to GND. The DAP enhances thermal performance and must be soldered to a PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BOOST | Bootstrap gate-drive supply | Connects to SW via 0.01 µF ceramic capacitor; supplies >2.5 V above SW to fully enhance internal NMOS switch. |
| 2 - GND | Signal and power ground | Reference for feedback network and internal circuitry; bottom resistor of FB divider must connect here for accurate regulation. |
| 3 - FB | Feedback input | High-impedance node (250 nA max bias); connects to resistor divider to set output voltage; trace must be short and noise-shielded. |
| 4 - EN | Enable control | Logic-high (>1.8 V) enables operation; logic-low (<0.4 V) disables with 30 nA standby current; 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 near pin to suppress switching transients. |
| 6 - SW | Power switch node | Drives external inductor and catch diode; swings between ~VIN (on) and ~−0.35 V (off); high dv/dt node requiring compact layout. |
| DAP | Die Attach Pad | Internally tied to GND; must be soldered to PCB ground plane with ≥4 thermal vias for thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| Internal 300 mΩ NMOS switch | Enables full 1 A output without external FET; reduces BOM count and layout area in TSOT-6 footprint. |
| 3 MHz fixed-frequency PWM | Permits use of <3 mm inductors and low-ESR ceramic capacitors, minimizing solution size to <50 mm² total PCB area. |
| Current-mode control with internal compensation | Eliminates need for external compensation network; provides inherent cycle-by-cycle current limiting and fast transient response. |
| Integrated soft-start (200 µs ramp) | Prevents inrush current during startup by linearly ramping reference voltage from 0 V to 0.8 V. |
| Output overvoltage protection | Shuts off internal switch if FB exceeds 10% above 0.8 V reference, protecting downstream 3.3 V or 2.5 V ICs. |
Applications
| DSL Modems | USB-Powered Devices |
|---|---|
Use Scenario: Regulating 5 V USB input to 3.3 V or 2.5 V for PHY, controller, and memory in compact DSL modem designs. IC Role / Device Role / Timing Role: Primary point-of-load DC-DC converter providing stable, low-noise rail with fast load-step response to handle burst data traffic. Use Value: 3 MHz switching avoids audible noise and EMI in sensitive analog front-end sections; 1 A capability supports multi-chip integration. | Use Scenario: Powering portable diagnostic tools, HID peripherals, or OTG accessories directly from USB 2.0/3.0 ports. IC Role / Device Role / Timing Role: Efficient buck regulator converting 5 V USB source to user-defined output (e.g., 1.8 V for MCU core, 3.3 V for I/O). Use Value: 30 nA shutdown current extends battery life in host-less modes; TSOT-6 footprint fits within tight USB connector proximity constraints. |
| Local Point-of-Load Regulation | Battery-Powered Devices |
Use Scenario: Generating clean, localized 1.2 V or 1.8 V rails for FPGA I/O banks or ASIC cores on dense digital boards. IC Role / Device Role / Timing Role: Standalone step-down regulator with minimal external parts, placed adjacent to load to minimize IR drop and noise coupling. Use Value: Internal compensation and current-mode control ensure stability with low-ESR ceramic output caps; 118°C/W θJA supports thermal design without heatsinks. | Use Scenario: Supplying regulated 3.3 V from single-cell Li-ion (3.0–4.2 V) or dual-cell alkaline (2.0–3.2 V) sources in handheld instruments. IC Role / Device Role / Timing Role: Main system regulator managing dynamic load changes during sensor sampling, display updates, and wireless transmission. Use Value: 3 V minimum input enables operation down to battery end-of-life; UVLO hysteresis prevents oscillation during brownout conditions. |
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 |
|---|---|---|---|
| TPS62231DRYR | 3 MHz, 1 A, 2.05–6.5 V input; 0.6 V reference; 12 µA quiescent current in PWM mode; WSON-6 package (2 mm × 2 mm). | Lower input range limits use in 12 V or 20 V systems; higher IQ than LM2734ZMK's 30 nA shutdown but lower than its 1.5 mA active IQ. | Preferred when board space is more constrained than input voltage range; not suitable for >6.5 V inputs. |
| MP2104DQ-LF-Z | 1.5 MHz, 1 A, 2.5–6 V input; 0.8 V reference; 25 µA quiescent current; QFN-6 (2 mm × 2 mm) with exposed pad. | Half the switching frequency increases inductor size; narrower input range excludes 12 V/20 V applications; no internal OVP or soft-start. | Valid alternative only for low-input, cost-sensitive designs where 3 MHz is unnecessary and external OVP can be added. |
Compared with TPS62231DRYR and MP2104DQ-LF-Z, the LM2734ZMK uniquely supports 20 V input with 3 MHz operation and integrated OVP/soft-start in TSOT-6 - making it optimal for industrial USB adapters, DSL hardware, and wide-input PoL where reliability and small size are jointly critical.
Availability
LM2734ZMK is available at Aetrix Electronics and suitable for DSL modems, USB-powered devices, and local point-of-load regulation requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2734ZMK 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 support.
The LM2734ZMK belongs to TI's high-frequency buck regulator product line, engineered for minimal PCB area in space-constrained applications such as networking endpoints, portable instrumentation, and USB-C peripheral power stages.
FAQ
What is the maximum input voltage rating for the LM2734ZMK?
The LM2734ZMK has an absolute maximum input voltage rating of 24 V, but its specified operating input range is 3 V to 20 V. Operation beyond 20 V may cause undefined behavior or damage, and the device incorporates undervoltage lockout that activates below 2.74 V (rising) to prevent unstable startup. Always observe the 20 V upper limit for reliable long-term operation in the LM2734ZMK.
Does the LM2734ZMK require an external catch diode?
Yes, the LM2734ZMK requires an external Schottky catch diode connected between SW and GND. It does not integrate a synchronous rectifier; the diode conducts during the NMOS switch off-time to maintain inductor current continuity. A low-forward-voltage Schottky (e.g., 0.35 V at 1 A) is recommended to maximize efficiency - especially critical given the LM2734ZMK's 1 A capability and 3 MHz switching.
Can the LM2734ZMK be used with ceramic output capacitors only?
Yes, the LM2734ZMK is fully compatible with ceramic-only output capacitance. Its current-mode control and internal compensation are optimized for low-ESR MLCCs (X5R/X7R), and typical designs use ≥10 µF ceramic output caps. Unlike older buck controllers, the LM2734ZMK does not require tantalum or electrolytic capacitors for stability - simplifying BOM and improving reliability in the LM2734ZMK design.
What is the purpose of the BOOST pin on the LM2734ZMK?
The BOOST pin on the LM2734ZMK supplies gate drive voltage to the internal NMOS switch via a bootstrap capacitor connected between BOOST and SW. During switch off-time, the capacitor charges from VIN or VOUT; during on-time, it elevates the gate voltage above SW to fully enhance the 300 mΩ NMOS. Proper BOOST voltage (2.5–5.5 V above SW) is essential for achieving rated 1 A output and high efficiency in the LM2734ZMK.
Is the LM2734ZMK pin-compatible with the LM2734ZQ variants?
No, the LM2734ZMK (TSOT-6) and LM2734ZQMK (also TSOT-6) share identical pinout and package, but the LM2734ZQMK is AEC-Q100 Grade 1 qualified for automotive use with enhanced manufacturing controls and extended test coverage. Electrically and mechanically, the LM2734ZMK and LM2734ZQMK are pin-compatible; however, the LM2734ZMK is intended for industrial/commercial applications and lacks automotive qualification documentation.
LM2734ZMK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- 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:
- SOT-23-THIN
LM2734ZMK FAQ
1.How can I place an order for LM2734ZMK through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2734ZMK 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 reliable?
The price and inventory of LM2734ZMK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2734ZMK is usually 5 days.
3.What payment methods are accepted for LM2734ZMK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2734ZMK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2734ZMK?
LM2734ZMK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2734ZMK 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?
For technical support, including LM2734ZMK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2734ZMK requirements.
6.How does Aetrix verify that LM2734ZMK is sourced from the original manufacturer or authorized distributors?
All LM2734ZMK 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 meets industry standards.
7.What is the process for return or replacement of LM2734ZMK?
All LM2734ZMK units undergo pre-shipment inspection (PSI). If there is an issue with LM2734ZMK, 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 part is unused and in its original packaging.
Return procedure for LM2734ZMK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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