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Texas Instruments LM2736XMKX/NOPB
- Part No.:
- LM2736XMKX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2736XMKX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 750MA SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,572
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Product details
Overview
LM2736XMKX/NOPB from Texas Instruments is a monolithic, current-mode PWM step-down DC-DC regulator in a 6-pin Thin SOT-6 package. It delivers up to 750 mA output current with 1.6 MHz fixed switching frequency, 1.25 V internal reference (±2%), 350 mΩ NMOS switch RDS(ON), and 30 nA shutdown current - enabling compact, high-efficiency local point-of-load regulation in space-constrained USB-powered devices.
For engineers reviewing the LM2736XMKX/NOPB datasheet, LM2736XMKX/NOPB pinout, LM2736XMKX/NOPB application, or LM2736XMKX/NOPB equivalent, key selection considerations include input voltage range (3–18 V), output voltage programmability via FB resistor divider, thermal shutdown (165°C), cycle-by-cycle current limit (1.5 A typ), and internal soft-start (200 µs ramp).
Technical Context
The LM2736XMKX/NOPB implements constant-frequency current-mode control with internal compensation, supporting duty cycles from 1% to 92% across its 3–18 V input range. Its 1.6 MHz oscillator enables use of small 4.7 µH inductors and ceramic capacitors while maintaining stable regulation down to 1.25 V output.
It integrates a 350 mΩ NMOS power switch, 1.25 V ±2% reference, undervoltage lockout (2.74 V rising, 2.3 V falling), and output overvoltage protection (10% above VFB). The BOOST pin supplies gate drive via external bootstrap capacitor, requiring VBOOST–VSW ≥ 2.5 V for full 750 mA capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.6 MHz - enables use of 4.7 µH inductors and chip-scale ceramic capacitors, minimizing PCB area. |
| Max Output Current | 750 mA - sustained load capability with internal 350 mΩ NMOS switch and thermal shutdown at 165°C. |
| Input Voltage Range | 3.0 V to 18 V - supports wide-input applications including USB-powered and industrial 12 V rails. |
| Feedback Reference | 1.25 V ±2% - sets output voltage via external resistor divider; enables precise 1.25–16 V programmability. |
| Shutdown Current | 30 nA typical - ultra-low quiescent draw during EN = low, critical for battery life in portable systems. |
| Current Limit | 1.5 A typical - cycle-by-cycle protection prevents damage during overload or short-circuit conditions. |
| Soft-Start Time | ~200 µs - linear ramp of error amplifier reference reduces inrush current and prevents output overshoot. |
Pinout & Package
LM2736XMKX/NOPB uses a 6-pin Thin SOT-6 (DDC) package, 2.90 mm × 1.60 mm body size, with exposed pad for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pin 1) | Bootstrap supply input | Drives NMOS gate; requires external capacitor to SW; must maintain ≥2.5 V above SW for full 750 mA operation. |
| GND (Pin 2) | Signal and power ground | Reference for feedback network and internal circuitry; place bottom feedback resistor adjacent to minimize noise. |
| FB (Pin 3) | Feedback input | Monitors output via resistor divider; regulates VOUT = 1.25 V × (1 + R1/R2); bias current ≤250 nA. |
| EN (Pin 4) | Enable control input | Logic-high (>1.8 V) enables regulation; logic-low (<0.4 V) enters shutdown (30 nA IQ); do not float. |
| VIN (Pin 5) | Main input supply | 3–18 V input; bypass with ≥10 µF ceramic capacitor close to pin; UVLO activates below 2.3 V. |
| SW (Pin 6) | Switch node output | Connects to inductor, catch diode, and BOOST capacitor; swings between ~0 V and VIN − ILOAD×RDS(ON). |
Key Features
| Feature | Design Value |
|---|---|
| Internal compensation | Eliminates need for external compensation components - simplifies design and improves stability across loads. |
| Current-mode PWM control | Provides inherent cycle-by-cycle current limiting and fast transient response without external current sense. |
| Output overvoltage protection | Shuts off NMOS switch when FB exceeds 1.375 V (10% above 1.25 V ref), preventing downstream component damage. |
| Thermal shutdown | Disables switching at 165°C junction temperature; resumes operation after cooldown to ~150°C - protects against sustained overload. |
| Undervoltage lockout (UVLO) | Prevents startup until VIN ≥2.74 V and holds operation until VIN drops to 2.3 V - avoids brownout instability. |
Applications
| USB-Powered Portable Devices | Set-Top Box Core Rails |
|---|---|
|
Use Scenario: Powering FPGA I/O banks or microcontroller peripherals from a 5 V USB source requiring clean, regulated 3.3 V or 1.8 V. IC Role / Device Role / Timing Role: Primary step-down regulator delivering 750 mA at 1.6 MHz with minimal board footprint. Use Value: Enables use of tiny 4.7 µH inductors and 0805 MLCCs, reducing total solution size by >40% vs. lower-frequency alternatives. |
Use Scenario: Generating 1.2 V core voltage for digital demodulator ICs in cable/satellite receivers with tight ripple and transient requirements. IC Role / Device Role / Timing Role: Local point-of-load converter with internal soft-start and current-mode control for fast load-step response. Use Value: 200 µs soft-start prevents inrush-induced voltage droop on shared 5 V rail; 1.5 A current limit handles burst-mode loads safely. |
| Notebook Computer Subsystems | HDD Head Actuator Drivers |
|
Use Scenario: Supplying 5 V or 3.3 V to USB hubs, card readers, or display interface ICs in ultrathin notebooks where height and thermal headroom are constrained. IC Role / Device Role / Timing Role: Compact, thermally efficient buck regulator operating from main 12 V or 5 V system rail. Use Value: 1.6 MHz switching allows thin-profile inductors and eliminates need for heatsinking - ideal for <1 mm height envelopes. |
Use Scenario: Providing stable 12 V bias to HDD voice coil motor drivers where EMI-sensitive analog circuits share the same PCB. IC Role / Device Role / Timing Role: High-frequency buck converter minimizing conducted EMI through narrow switching edges and fixed frequency. Use Value: 1.6 MHz operation shifts noise spectrum above sensitive audio/RF bands; integrated soft-start prevents mechanical shock during spin-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2736YMKX/NOPB | 550 kHz switching frequency; 96% max duty cycle vs. 92% for X-version; higher RDS(ON) (650 mΩ max) at temperature. | Better suited for higher-output-voltage designs (e.g., 5 V out from 12 V in) due to longer minimum on-time and lower switching loss. | Select LM2736YMKX/NOPB when board space permits larger inductors/caps and efficiency at light loads is prioritized over size. |
| TPS62231DRVR | 3 MHz switching; 600 mA rated output; 17 µA quiescent current in PWM mode; no BOOST pin - uses integrated charge pump. | Designed for ultra-low-power always-on rails (e.g., RTC, sensors); lacks 750 mA capability and external boost flexibility of LM2736X. | Choose TPS62231DRVR only for sub-600 mA, battery-critical applications where 3 MHz enables smallest passive size - not a drop-in replacement. |
Compared with LM2736YMKX/NOPB, the LM2736XMKX/NOPB trades slightly lower light-load efficiency for significantly smaller magnetics and reduced EMI filtering burden; versus TPS62231DRVR, it offers higher current, wider input range, and configurable boost architecture - making it superior for USB-powered 750 mA loads.
Availability
LM2736XMKX/NOPB is available at Aetrix Electronics and suitable for USB-powered portable devices, set-top box core rails, notebook computer subsystems, and HDD head actuator drivers requiring stable component supply and long-term industrial availability.
Supply support for LM2736XMKX/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 specializing in analog and embedded processing technologies, with leadership in power management ICs for industrial, automotive, and consumer applications.
The LM2736XMKX/NOPB belongs to TI's Thin SOT buck regulator product line, engineered for high-density point-of-load conversion in space- and efficiency-constrained portable electronics.
FAQ
What is the recommended input capacitor value for LM2736XMKX/NOPB in a 5 V to 3.3 V application?
For a 5 V input to 3.3 V output application, TI recommends a 10 µF, 6.3 V X5R/X7R ceramic capacitor placed as close as possible to the VIN and GND pins of the LM2736XMKX/NOPB. This value ensures adequate RMS current handling and minimizes input voltage droop during 1.6 MHz switching transients. Lower values like 4.7 µF may suffice below 6 V input but increase ripple risk under peak 750 mA load.
Does LM2736XMKX/NOPB require an external bootstrap diode, and what type is recommended?
Yes, the LM2736XMKX/NOPB requires an external bootstrap diode (D2) connected between VIN (or VOUT) and the BOOST pin. TI specifies a 1N4148W or equivalent low-leakage, fast-switching signal diode rated for ≥50 mA forward current. This diode charges the BOOST capacitor during SW low-time; using a Schottky diode is not recommended due to higher reverse leakage that degrades gate drive voltage stability.
Can LM2736XMKX/NOPB regulate output voltages below 1.25 V?
No, the LM2736XMKX/NOPB cannot regulate below 1.25 V because its internal feedback reference is fixed at 1.25 V ±2%. The output voltage is set by VOUT = 1.25 V × (1 + R1/R2), so the lowest achievable output is 1.25 V (when R2 is omitted and FB tied directly to VOUT). For sub-1.25 V regulation, a different regulator with adjustable reference or external reference injection is required.
How does thermal shutdown behave in LM2736XMKX/NOPB during continuous overload?
In LM2736XMKX/NOPB, thermal shutdown activates when junction temperature exceeds 165°C, immediately disabling the NMOS switch and halting switching. The device remains latched off until junction temperature falls to approximately 150°C, at which point normal regulation resumes automatically. This hysteresis prevents oscillatory shutdown/restart and protects the IC during sustained overload or poor PCB thermal design.
Is LM2736XMKX/NOPB compatible with ceramic output capacitors, and what ESR considerations apply?
Yes, LM2736XMKX/NOPB is fully compatible with low-ESR ceramic output capacitors (e.g., X5R/X7R MLCCs). Its current-mode control and internal compensation are optimized for near-zero ESR, eliminating stability risks common with older buck controllers. TI recommends ≥10 µF total output capacitance; ESR is not a design constraint, but capacitor voltage rating must exceed VOUT + 10% margin and DC bias derating must be verified per manufacturer data.
LM2736XMKX/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):
- 18V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 16V
- Current - Output:
- 750mA
- Frequency - Switching:
- 1.6MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
LM2736XMKX/NOPB FAQ
1.How can I place an order for LM2736XMKX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2736XMKX/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 LM2736XMKX/NOPB reliable?
The price and inventory of LM2736XMKX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2736XMKX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2736XMKX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2736XMKX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2736XMKX/NOPB?
LM2736XMKX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2736XMKX/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 LM2736XMKX/NOPB?
For technical support, including LM2736XMKX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2736XMKX/NOPB requirements.
6.How does Aetrix verify that LM2736XMKX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2736XMKX/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 LM2736XMKX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2736XMKX/NOPB?
All LM2736XMKX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2736XMKX/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 LM2736XMKX/NOPB part is unused and in its original packaging.
Return procedure for LM2736XMKX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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