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Texas Instruments LM2736YMKX/NOPB
- Part No.:
- LM2736YMKX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2736YMKX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 750MA SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,336
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Product details
Overview
LM2736YMKX/NOPB from Texas Instruments is a monolithic, current-mode PWM step-down DC-DC regulator in a 6-pin Thin SOT-23 (DDC) package. It delivers up to 750 mA output current with 550 kHz fixed switching frequency, 1.25 V internal reference (±2%), and 350 mΩ NMOS switch - designed for compact point-of-load conversion in space-constrained USB-powered devices and notebook subsystems.
For engineers reviewing the LM2736YMKX/NOPB datasheet, LM2736YMKX/NOPB pinout, LM2736YMKX/NOPB application, or LM2736YMKX/NOPB equivalent, key selection criteria include input voltage range (3.0–18 V), output adjustability (1.25–16 V via resistor divider), ultra-low 30 nA shutdown current, thermal shutdown at 165°C, and internal soft-start for controlled VOUT ramp-up.
Technical Context
The LM2736YMKX/NOPB implements constant-frequency current-mode control with internal compensation, enabling stable regulation without external loop components. Its 13 ns minimum on-time supports high duty-cycle operation down to 1.25 V output across the full 3–18 V input range.
It integrates undervoltage lockout (UVLO with 2.74 V turn-on and 2.3 V turn-off thresholds), cycle-by-cycle current limiting (1.5 A typical), overvoltage protection (10% above VREF), and bootstrap gate-drive circuitry requiring VBOOST–VSW between 2.5 V and 5.5 V for optimal NMOS switching efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 550 kHz - enables use of small 4.7 µH inductors and ceramic capacitors; reduces board area vs. lower-frequency buck regulators. |
| Output Current | 750 mA - sufficient for core rail or peripheral supply in portable electronics without external pass devices. |
| Input Voltage Range | 3.0 V to 18 V - supports single-cell Li-ion (with boost), multi-cell battery, and wide-input industrial rails. |
| Feedback Reference | 1.25 V ±2% - sets precise output voltage via external R1/R2 divider; tolerance directly impacts VOUT accuracy. |
| Shutdown Current | 30 nA - minimizes battery drain in always-on standby modes for USB-powered and notebook applications. |
| Internal NMOS RDS(ON) | 350 mΩ (typ) - determines conduction loss and thermal rise at full load; limits max practical output power at low VIN. |
| Soft-Start Time | ~200 µs - linearly ramps error amplifier reference to limit inrush current into output capacitance during startup. |
Pinout & Package
LM2736YMKX/NOPB uses a 6-pin Thin SOT-23 (DDC) package measuring 2.90 mm × 1.60 mm, optimized for high-density PCB layouts. Thermal resistance is RθJA = 158.1°C/W on a 4-layer 3″×3″ board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pin 1) | Bootstrap gate-drive supply | Connects to SW via 0.01 µF ceramic capacitor; supplies >2.5 V gate drive above SW to fully enhance internal NMOS switch. |
| GND (Pin 2) | Signal and power ground | Reference node for feedback divider and internal circuits; bottom resistor of FB divider must be placed adjacent to this pin. |
| FB (Pin 3) | Voltage feedback input | Senses output via resistor divider; regulates VOUT by comparing divider voltage to 1.25 V internal reference. |
| EN (Pin 4) | Enable control input | Logic-high (>1.8 V) enables regulation; logic-low (<0.4 V) disables switch and reduces quiescent current to 30 nA. |
| VIN (Pin 5) | Main input supply | Accepts 3–18 V; requires local 10 µF ceramic bypass capacitor to suppress switching transients and stabilize input impedance. |
| SW (Pin 6) | Switch node output | Drives external inductor and catch diode; swings from ~0 V (during off-time) to near VIN (during on-time); high dv/dt node requiring tight layout. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode PWM control | Enables fast transient response and inherent cycle-by-cycle current limiting without external sense resistors. |
| Internal soft-start | Prevents output overshoot and limits inrush into large output capacitors by ramping reference voltage over ~200 µs. |
| Output overvoltage protection | Shuts down NMOS switch if FB exceeds 1.375 V (10% above 1.25 V reference), protecting downstream loads from fault conditions. |
| Thermal shutdown | Disables switching when junction temperature exceeds 165°C; resumes operation only after cooling to ~150°C. |
| Undervoltage lockout (UVLO) | Prevents erratic startup by holding regulator disabled until VIN rises above 2.74 V, with 440 mV hysteresis for clean power sequencing. |
Applications
| USB-Powered Peripherals | Notebook Subsystem Rails |
|---|---|
Use Scenario: Powering FPGA I/O banks or USB hub controllers from a 5 V USB port. IC Role / Device Role / Timing Role: Primary step-down regulator converting 5 V USB input to 3.3 V or 1.8 V logic rail. Use Value: 750 mA output and 30 nA shutdown current extend battery life in bus-powered devices while maintaining fast transient response to burst data traffic. |
Use Scenario: Generating DDR memory termination voltage (VTT) or display backlight bias in ultraportable notebooks. IC Role / Device Role / Timing Role: Compact, integrated buck converter replacing discrete MOSFET+controller solutions for secondary rails. Use Value: Thin SOT-23 footprint and 550 kHz switching allow placement near BGA packages with minimal PCB real estate and no external compensation. |
| HDD Core Power | DSL/STB Point-of-Load |
Use Scenario: Supplying 1.2 V core voltage to 2.5″ HDD controller ICs in external storage enclosures. IC Role / Device Role / Timing Role: Local DC/DC regulator delivering regulated core power with tight load regulation under dynamic disk spin-up currents. Use Value: 350 mΩ NMOS switch and current-mode control maintain <1% output deviation during 500 mA load steps, reducing need for oversized output capacitance. |
Use Scenario: Providing 5 V or 3.3 V auxiliary rails in set-top boxes and DSL modems powered from 12 V wall adapters. IC Role / Device Role / Timing Role: Secondary buck regulator decoupling noisy system rails to isolate sensitive analog or RF sections. Use Value: 550 kHz fixed frequency avoids audible noise and simplifies EMI filtering compared to variable-frequency alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2736XMKX/NOPB | 1.6 MHz switching frequency, higher IBOOST (2.2 mA typ), reduced inductor size requirement but higher switching losses at high VIN. | Better suited for ultra-compact designs where 4.7 µH inductors are preferred over 10 µH; less optimal for 12–18 V input due to efficiency drop. | Select LM2736XMKX/NOPB when board area is critical and input voltage is ≤6 V; otherwise LM2736YMKX/NOPB offers better efficiency across wider VIN range. |
| TPS62231DRVR | 3 MHz switching, 600 mA output, 20 µA quiescent current in PWM mode, no BOOST pin - uses integrated high-side switch with no external bootstrap. | Lacks programmable UVLO and OVP; requires different layout (no SW node routing) and smaller inductors; not pin-compatible. | Choose TPS62231DRVR for lowest quiescent current in always-on sensor nodes; LM2736YMKX/NOPB remains preferred where robust fault protection and 750 mA capability are required. |
Compared with LM2736XMKX/NOPB, LM2736YMKX/NOPB trades higher inductor size for broader input range efficiency and lower gate-drive complexity; versus TPS62231DRVR, it provides higher output current, integrated OVP/UVLO, and proven ruggedness in industrial USB and storage applications - at the cost of slightly larger solution footprint.
Availability
LM2736YMKX/NOPB is available at Aetrix Electronics and suitable for USB-powered peripherals, notebook subsystem rails, HDD core power, and DSL/STB point-of-load applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance.
Supply support for LM2736YMKX/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 leader specializing in analog, embedded processing, and power management ICs, with decades of expertise in high-efficiency DC-DC conversion and automotive-grade reliability.
The LM2736YMKX/NOPB belongs to TI's Thin SOT buck regulator product line, engineered specifically for space-constrained, battery-sensitive applications where integration, thermal performance, and fault protection are prioritized over minimal bill-of-materials count.
FAQ
What is the recommended input capacitor value for LM2736YMKX/NOPB?
A 10 µF X5R/X7R ceramic capacitor rated for ≥6.3 V is recommended for most applications. At input voltages below 6 V, a 4.7 µF capacitor may suffice. The capacitor must have low ESL and sufficient RMS current rating - especially critical at 550 kHz switching - and should be placed as close as possible to the VIN and GND pins of the LM2736YMKX/NOPB to minimize loop inductance and suppress high-frequency noise.
Can LM2736YMKX/NOPB operate with an input voltage below 3.0 V?
No. The LM2736YMKX/NOPB has a guaranteed minimum operating input voltage of 3.0 V per its Recommended Operating Conditions. Below this, undervoltage lockout prevents operation - the device will not start up or regulate. Attempting to operate below 2.74 V (UVLO turn-on threshold) results in complete disablement; operation between 2.74 V and 3.0 V is outside datasheet specifications and not characterized for performance or reliability.
How does the BOOST pin function in LM2736YMKX/NOPB?
The BOOST pin supplies gate drive voltage to the internal NMOS switch. It connects via a 0.01 µF ceramic capacitor to the SW pin, forming a charge pump that generates VBOOST ≈ VIN + VSW during switch off-time. This ensures VBOOST–VSW remains between 2.5 V and 5.5 V - essential for full enhancement of the 350 mΩ NMOS. Incorrect BOOST capacitor value or placement causes poor efficiency or thermal shutdown in the LM2736YMKX/NOPB.
What output voltage range can be set using the FB pin of LM2736YMKX/NOPB?
The FB pin allows adjustable output voltages from 1.25 V to 16 V using an external resistor divider. With the internal 1.25 V reference and 2% tolerance, the minimum output is fixed at 1.25 V (achieved with R2 = 0 Ω, R1 open). Higher outputs require scaling: VOUT = 1.25 V × (1 + R1/R2). The LM2736YMKX/NOPB maintains regulation across this full range provided input voltage exceeds VOUT + dropout (determined by RDS(ON) and load).
Does LM2736YMKX/NOPB require external compensation components?
No. The LM2736YMKX/NOPB features fully internal compensation - no external capacitors or resistors are needed for loop stability. This simplifies design and reduces BOM count. The current-mode architecture and internal transconductance amplifier are factory-tuned to ensure stable operation with standard ceramic output capacitors (≥10 µF) and typical inductor values (4.7–10 µH), as validated in TI's reference designs for the LM2736YMKX/NOPB.
LM2736YMKX/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:
- 550kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
LM2736YMKX/NOPB FAQ
1.How can I place an order for LM2736YMKX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2736YMKX/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 LM2736YMKX/NOPB reliable?
The price and inventory of LM2736YMKX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2736YMKX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2736YMKX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2736YMKX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2736YMKX/NOPB?
LM2736YMKX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2736YMKX/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 LM2736YMKX/NOPB?
For technical support, including LM2736YMKX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2736YMKX/NOPB requirements.
6.How does Aetrix verify that LM2736YMKX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2736YMKX/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 LM2736YMKX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2736YMKX/NOPB?
All LM2736YMKX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2736YMKX/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 LM2736YMKX/NOPB part is unused and in its original packaging.
Return procedure for LM2736YMKX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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