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Texas Instruments LM2736YMK/NOPB
- Part No.:
- LM2736YMK/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2736YMK/NOPB.pdf
- Description:
- IC REG BUCK ADJ 750MA SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:3,341
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Product details
Overview
LM2736YMK/NOPB from Texas Instruments is a monolithic, current-mode PWM step-down DC-DC regulator in a 6-pin Thin SOT 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 regulation in space-constrained battery-powered and USB-powered devices.
For engineers reviewing the LM2736YMK/NOPB datasheet, LM2736YMK/NOPB pinout, LM2736YMK/NOPB application, or LM2736YMK/NOPB equivalent, key selection considerations include input voltage range (3.0–18 V), output adjustability (1.25–16 V via resistor divider), ultra-low 30 nA shutdown current, internal soft-start, and thermal/overcurrent protection - all within a 2.90 mm × 1.60 mm footprint.
Technical Context
The LM2736YMK/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 (2.74 V turn-on, 2.3 V turn-off with 440 mV hysteresis), cycle-by-cycle current limiting (1.5 A typical), overvoltage protection (FB > 1.375 V triggers shutdown), and thermal shutdown at 165°C - all operating within −40°C to +125°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 550 kHz (fixed) - enables use of small 4.7 µH inductors and ceramic capacitors for minimal PCB area. |
| Output Current | 750 mA continuous - sufficient for core power in HDDs, set-top boxes, and notebook subsystems. |
| Input Voltage Range | 3.0 V to 18 V - supports wide-input applications including automotive infotainment and industrial 12 V rails. |
| Feedback Reference | 1.25 V ±2% - sets output voltage accuracy via external resistor divider (e.g., R1 = 2 kΩ, R2 = 10 kΩ → 3.3 V). |
| Shutdown Current | 30 nA typical - preserves battery life in always-on or low-power standby modes. |
| NMOS Switch RDS(ON) | 350 mΩ typical - limits conduction loss at 750 mA, supporting >90% efficiency at 5 VIN/3.3 VOUT. |
| Soft-Start Time | ~200 µs - linear ramp of error amplifier reference reduces inrush current and prevents output overshoot. |
Pinout & Package
Package: Thin SOT-6 (DDC), 2.90 mm × 1.60 mm body size, 0.95 mm max height - optimized for high-density layouts and automated assembly.
| 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 above SW to fully enhance internal NMOS switch. |
| GND (Pin 2) | Signal and power ground | Reference node for feedback divider; requires low-inductance connection to minimize regulation error. |
| FB (Pin 3) | Feedback input | Senses output voltage via resistor divider; internal 1.25 V reference compares against FB to regulate VOUT. |
| EN (Pin 4) | Enable control | Logic-high (>1.8 V) enables operation; logic-low (<0.4 V) disables regulator and reduces IQ to 30 nA. |
| VIN (Pin 5) | Main input supply | Accepts 3–18 V; requires local 10 µF ceramic bypass capacitor to suppress switching transients. |
| SW (Pin 6) | Switch node | Drives external inductor and catch diode; swings from ~0 V (during off-time) to VIN − ILOAD×RDS(ON) (during on-time). |
Key Features
| Feature | Design Value |
|---|---|
| Internal compensation | Eliminates need for external compensation network - simplifies design and reduces BOM count. |
| Current-mode PWM control | Provides inherent cycle-by-cycle current limiting and fast transient response to load steps. |
| Thermal shutdown | Turns off switch at 165°C junction temperature; resumes operation after cooldown to ~150°C. |
| Output overvoltage protection | Disables switch if FB exceeds 1.375 V (10% above 1.25 V reference), preventing damage to downstream loads. |
| WEBENCH® integration | Supports online schematic generation, BOM export, and performance simulation directly from TI's design tool. |
Applications
| Local Point-of-Load Regulation | Core Power in HDDs |
|---|---|
Use Scenario: Regulating 3.3 V or 5 V from a 12 V or 19 V system rail near FPGA or ASIC power pins. IC Role / Device Role / Timing Role: Primary buck converter delivering stable, low-noise DC power with fast load-step response. Use Value: 750 mA capability and 550 kHz switching enable compact layout with <10 mm² total solution size. |
Use Scenario: Supplying spindle motor driver or servo controller ICs in 2.5″/3.5″ hard disk drives. IC Role / Device Role / Timing Role: Secondary voltage regulator converting main 12 V rail to 5 V or 3.3 V for logic and interface circuits. Use Value: 30 nA shutdown current extends battery runtime during drive idle states; thermal shutdown protects against enclosure overheating. |
| USB-Powered Devices | Notebook Computers |
Use Scenario: Powering USB-C peripheral hubs, dongles, or portable SSD enclosures from 5 V USB bus. IC Role / Device Role / Timing Role: Step-down regulator generating 3.3 V or 1.8 V for USB PHY, microcontroller, or flash memory. Use Value: Wide 3–18 V input accommodates USB PD negotiation; thin SOT-6 package fits tight board edges near USB connectors. |
Use Scenario: Providing auxiliary voltages (e.g., 1.5 V DDR, 1.05 V CPU core) in notebook sub-regulators or docking stations. IC Role / Device Role / Timing Role: Compact, efficient buck stage for non-primary power domains requiring <1 A current. Use Value: Internal soft-start prevents inrush-induced brownout on shared 5 V/12 V rails; 1.25 V reference ensures precise voltage setting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2736XMK/NOPB | 1.6 MHz switching frequency vs. 550 kHz; higher quiescent current (2.2 mA vs. 1.5 mA); same package and pinout. | Better suited for ultra-compact designs needing smaller inductors (e.g., <2.2 µH); less optimal for noise-sensitive analog sections. | Select LM2736XMK/NOPB when board area is critical and EMI filtering can accommodate higher frequency harmonics. |
| TPS62231DRVR | 3 MHz switching, 600 mA output, 2.05 V to 6.5 V input, 0.6 V reference, DSBGA-6 package (1.5 mm × 1.5 mm). | Requires external compensation; lower input voltage range limits use in 12 V systems; smaller footprint but different layout. | Choose TPS62231DRVR only for low-input-voltage, ultra-small-footprint applications where 12 V compatibility is not required. |
Compared with LM2736YMK/NOPB, the LM2736XMK/NOPB offers higher frequency for smaller passives but trades off efficiency at light loads; the TPS62231DRVR provides superior miniaturization at the cost of input range and integrated compensation - making LM2736YMK/NOPB the balanced choice for general-purpose 3–18 V, 750 mA point-of-load conversion.
Availability
LM2736YMK/NOPB is available at Aetrix Electronics and suitable for local point-of-load regulation, core power in HDDs, and USB-powered devices requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2736YMK/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 LM2736 product line delivers compact, internally compensated buck regulators targeting space-constrained, battery-sensitive applications - emphasizing ease of use, thermal robustness, and seamless integration into consumer, computing, and industrial power architectures.
FAQ
What is the maximum output voltage achievable with LM2736YMK/NOPB?
The LM2736YMK/NOPB supports an adjustable output voltage range of 1.25 V to 16 V using an external resistor divider on the FB pin. The upper limit is constrained by the absolute maximum ratings of the internal reference and feedback amplifier - exceeding 16 V risks violating the FB pin voltage limit of 3 V and may cause regulation failure or damage. For 16 V output, ensure VIN remains ≤18 V and the feedback resistors are rated for appropriate voltage division.
Does LM2736YMK/NOPB require an external bootstrap diode?
No, the LM2736YMK/NOPB does not require an external bootstrap diode. Its BOOST pin is designed to be connected directly to the SW node through a 0.01 µF ceramic capacitor (CBOOST). The internal charge pump circuitry uses the SW node's switching action to generate the gate-drive voltage for the NMOS switch - eliminating the need for a discrete diode and simplifying the bill of materials.
Can LM2736YMK/NOPB operate with a 2.5 V input supply?
No, LM2736YMK/NOPB cannot reliably operate with a 2.5 V input. Its undervoltage lockout (UVLO) turn-on threshold is 2.74 V (typical), and operation below this level is not guaranteed. At 2.5 V, the device remains disabled, and the internal NMOS switch will not activate. Minimum recommended input is 3.0 V per datasheet specifications to ensure stable startup and regulation.
What is the purpose of the BOOST–SW voltage specification (1.6 V to 5.5 V)?
The BOOST–SW voltage specification defines the valid gate-drive voltage range for the internal NMOS switch. A minimum of 1.6 V ensures sufficient enhancement of the MOSFET channel; however, ≥2.5 V is recommended for best efficiency and full 750 mA output capability. Exceeding 5.5 V risks overstressing the gate oxide. This differential must be maintained during each on-time using the external CBOOST capacitor and proper PCB layout.
How does the internal soft-start function in LM2736YMK/NOPB affect startup behavior?
The LM2736YMK/NOPB implements internal soft-start by ramping its internal error amplifier reference voltage from 0 V to 1.25 V over ~200 µs. This forces the output voltage to rise linearly rather than abruptly, limiting inrush current into output capacitors and preventing undershoot on upstream rails. It eliminates the need for external soft-start circuitry while ensuring controlled, repeatable startup across temperature and load conditions.
LM2736YMK/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
LM2736YMK/NOPB FAQ
1.How can I place an order for LM2736YMK/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2736YMK/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 LM2736YMK/NOPB reliable?
The price and inventory of LM2736YMK/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2736YMK/NOPB is usually 5 days.
3.What payment methods are accepted for LM2736YMK/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2736YMK/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2736YMK/NOPB?
LM2736YMK/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2736YMK/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 LM2736YMK/NOPB?
For technical support, including LM2736YMK/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2736YMK/NOPB requirements.
6.How does Aetrix verify that LM2736YMK/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2736YMK/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 LM2736YMK/NOPB meets industry standards.
7.What is the process for return or replacement of LM2736YMK/NOPB?
All LM2736YMK/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2736YMK/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 LM2736YMK/NOPB part is unused and in its original packaging.
Return procedure for LM2736YMK/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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