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Texas Instruments LMR10515YSDE/NOPB
- Part No.:
- LMR10515YSDE/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LMR10515YSDE/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,440
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Product details
Overview
LMR10515YSDE/NOPB from Texas Instruments is a monolithic, current-mode PWM step-down DC/DC regulator in a 6-pin WSON package (3.0 × 3.0 × 0.8 mm), delivering up to 1.5 A output current with 0.6 V to 4.5 V adjustable output voltage, 3 MHz fixed switching frequency, and 30 nA shutdown quiescent current - designed for space-constrained point-of-load conversion from 3.3-V or 5-V rails.
For engineers reviewing the LMR10515YSDE/NOPB datasheet, LMR10515YSDE/NOPB pinout, LMR10515YSDE/NOPB application, or LMR10515YSDE/NOPB equivalent, key selection criteria include its 3-MHz high-frequency operation enabling ultra-compact magnetics, internal compensation reducing external component count, and thermal shutdown + overvoltage protection for robust industrial and portable power delivery.
Technical Context
The LMR10515YSDE/NOPB implements current-mode PWM control with an internally compensated error amplifier and fixed 3 MHz oscillator, supporting minimum on-times down to 30 ns for stable regulation at low duty cycles (e.g., 1.8 V out from 5 V in). Its integrated 150 mΩ PMOS switch enables high power density while maintaining ≥93% peak efficiency across load and temperature.
It features cycle-by-cycle current limiting (2.5 A typical), undervoltage lockout with 430 mV hysteresis (2.73 V rising, 2.3 V falling), soft-start with 600 µs ramp, and output overvoltage protection triggered at FB = 1.15 × VREF (0.69 V). The WSON package includes separate VINA (control supply) and VIND (power input) pins for improved noise immunity and layout flexibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 5.5 V - supports direct regulation from standard 3.3-V and 5-V system rails without pre-regulation. |
| Output Voltage Range | 0.6 V to 4.5 V - set via external resistor divider; enables core voltage scaling for microcontrollers and FPGAs. |
| Max Output Current | 1.5 A - sufficient for powering SoCs, sensors, and interface ICs in compact embedded systems. |
| Switching Frequency | 3 MHz - allows use of ≤1 µH inductors and 22 µF ceramic capacitors, minimizing solution footprint. |
| Feedback Reference Voltage | 0.600 V ±12 mV - high-accuracy reference enables tight output regulation (±2%) over line, load, and temperature. |
| Shutdown Quiescent Current | 30 nA typical - extends battery life in always-on or low-power sleep modes of portable equipment. |
| Thermal Shutdown Threshold | 165°C - protects against sustained overload or poor PCB thermal design; auto-recovery at ~150°C. |
Pinout & Package
LMR10515YSDE/NOPB uses a thermally enhanced 6-pin WSON package (3.0 mm × 3.0 mm × 0.8 mm) with exposed die attach pad (DAP) for low thermal impedance. Pin 5 (VINA) supplies control circuitry and must be tied to Pin 4 (VIND) on PCB; Pin 6 (EN) enables operation with logic-high signal; Pin 1 (FB) senses output voltage via resistor divider; Pin 2 (GND) serves as signal and power ground; Pin 3 (SW) connects to inductor and catch diode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - FB | Feedback input | Connects to bottom resistor of external voltage divider; regulates output by comparing to 0.6-V internal reference. |
| 2 - GND | Signal and power ground | Reference node for feedback, enable, and internal circuits; requires low-impedance connection to PCB ground plane. |
| 3 - SW | Switch node | Drives external inductor and Schottky catch diode; experiences high dv/dt during switching transitions. |
| 4 - VIND | Power input supply | Primary input rail connection; powers internal PMOS switch and high-current paths. |
| 5 - VINA | Control circuitry supply | Supplies bias for error amplifier, oscillator, and logic; must be shorted to VIND on PCB for proper operation. |
| 6 - EN | Enable control input | Logic-high (>1.8 V) enables regulator; logic-low (<0.4 V) disables with 30-nA IQ; must not float or exceed VINA + 0.3 V. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control loop | Eliminates need for external compensation network - reduces BOM count and design iteration time. |
| 3-MHz fixed-frequency PWM | Enables sub-1-mm-height power solutions using 0.47–1.0 µH shielded inductors and 22 µF X7R MLCCs. |
| Pulse-by-pulse current limit | Protects against short-circuit and overload with 2.5-A typical trip threshold - prevents thermal runaway during fault conditions. |
| Internal soft-start (600 µs) | Controls output voltage ramp rate to minimize inrush current into downstream capacitance and prevent input rail droop. |
| Output overvoltage protection | Shuts off PMOS switch if FB exceeds 0.69 V (15% above VREF), safeguarding connected loads from catastrophic overvoltage. |
Applications
| Point-of-Load Conversion | Battery-Powered Instruments |
|---|---|
Use Scenario: Regulating 3.3-V or 5-V system rail to 1.8 V for FPGA I/O banks or MCU cores in industrial PLC modules. IC Role / Device Role / Timing Role: Primary step-down regulator providing tightly regulated, low-noise DC supply with fast transient response. Use Value: Delivers 1.5-A peak current within 20-mV load regulation error while occupying <12 mm² PCB area including passives. | Use Scenario: Powering handheld test meters with dual 3.3-V analog front-end and 1.2-V digital processor rails from single Li-ion cell. IC Role / Device Role / Timing Role: High-efficiency buck converter operating in discontinuous conduction mode during light loads to extend runtime. Use Value: Achieves >85% efficiency at 10-mA load and 30-nA shutdown IQ preserves battery charge during multi-week storage. |
| Industrial Distributed Power | Power Metering Systems |
Use Scenario: Local 5-V-to-3.3-V conversion for isolated communication interfaces (RS-485, CAN transceivers) in factory automation nodes. IC Role / Device Role / Timing Role: Robust, thermally resilient DC/DC stage meeting extended temperature (-40°C to +125°C) and EMI requirements. Use Value: Maintains regulation under 100% load step with <50-µs recovery time; thermal shutdown prevents field failure in enclosed enclosures. | Use Scenario: Supplying metrology ADC, real-time clock, and RF wireless module in smart electricity meters with strict standby power limits. IC Role / Device Role / Timing Role: Primary power management IC enabling compliance with IEC 62053-21 Class 0.2 accuracy and 1-W max active power. Use Value: Supports 93% peak efficiency at full load and <10-µA total system standby current when combined with TI's ultra-low-IQ LDOs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62172DSGR | 2.25–5.5-V input, 3-MHz sync buck, 0.6-V ref, but 0.5-A max output and no VINA/VIND separation. | Suitable for lower-current sensor nodes; lacks thermal robustness for 1.5-A continuous loads. | Select when cost-sensitive, low-IQ (<10 µA) operation at <0.5 A is prioritized over output current capability. |
| LMR10515XSD/NOPB | Same package and pinout, but 1.6-MHz switching frequency and 130-mΩ SOT-23 variant; WSON version has 150-mΩ RDS(ON). | Better efficiency at medium loads due to lower switching loss; trades off solution size vs. EMI performance. | Choose for designs requiring larger inductors (≥2.2 µH) and relaxed EMI filtering, or where SOT-23 thermal performance suffices. |
Compared with TPS62172DSGR, LMR10515YSDE/NOPB delivers 3× higher output current in identical WSON packaging; versus LMR10515XSD/NOPB, it enables smaller magnetics and tighter transient response at the cost of marginally higher conduction loss and EMI filtering complexity.
Availability
LMR10515YSDE/NOPB is available at Aetrix Electronics and suitable for point-of-load conversion, battery-powered instrumentation, and industrial distributed power applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LMR10515YSDE/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, embedded processing, and power management technologies, with leadership in high-performance, thermally efficient DC/DC conversion solutions.
The LMR10515 product line targets space-constrained, high-frequency power delivery in portable, industrial, and metering applications - emphasizing minimal external components, internal compensation, and robust protection features.
FAQ
What is the recommended input capacitor for LMR10515YSDE/NOPB?
The LMR10515YSDE/NOPB requires a minimum 22-µF multilayer ceramic capacitor (MLCC) rated for ≥6.3 V, preferably X7R or X5R dielectric, placed as close as possible to the VIND and GND pins. This value ensures stable operation at 3 MHz and handles RMS input current up to 1.5 A × √[D(1−D)], where D is the duty cycle. Low-ESL 0805 or 1206 case sizes are strongly recommended to suppress high-frequency ringing.
Does LMR10515YSDE/NOPB require external compensation components?
No, LMR10515YSDE/NOPB is internally compensated - no external compensation network (e.g., type-II or type-III compensator) is needed. Its control loop is optimized for stability with standard 22-µF output capacitance and typical ceramic capacitor ESR values. This simplifies design, reduces bill-of-materials count, and eliminates tuning iterations during prototyping.
What is the maximum junction temperature and thermal resistance for LMR10515YSDE/NOPB?
The LMR10515YSDE/NOPB has a thermal shutdown threshold of 165°C and a maximum operating junction temperature of 125°C. In the WSON package, its junction-to-ambient thermal resistance (θJA) is 80°C/W under standard 4-layer 3″×3″ PCB conditions with 2 oz copper, and junction-to-case (θJC) is 18°C/W. Proper DAP grounding and thermal vias are essential to maintain safe operation at full 1.5-A load.
Can LMR10515YSDE/NOPB operate with an output voltage below 0.6 V?
No, LMR10515YSDE/NOPB cannot regulate below 0.6 V because its internal feedback reference voltage is fixed at 0.600 V ±12 mV. The minimum output voltage is determined by VOUT = VFB × (1 + R1/R2), so setting R1 = 0 Ω yields VOUT = VFB = 0.6 V. Attempting lower outputs violates regulation and may cause instability or overvoltage on startup.
How does the VINA and VIND pin separation benefit LMR10515YSDE/NOPB designs?
The VINA (Pin 5) and VIND (Pin 4) separation in LMR10515YSDE/NOPB isolates control circuitry supply from high-current power paths, reducing noise coupling into the error amplifier and oscillator. Though externally tied together on PCB, this architecture improves PSRR and transient immunity - especially critical in noisy industrial environments or when sharing input rails with high-dI/dt loads like motor drivers or RF transmitters.
LMR10515YSDE/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 6-WDFN Exposed Pad
- 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):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 4.5V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 3MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WSON (3x3)
LMR10515YSDE/NOPB FAQ
1.How can I place an order for LMR10515YSDE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR10515YSDE/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 LMR10515YSDE/NOPB reliable?
The price and inventory of LMR10515YSDE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR10515YSDE/NOPB is usually 5 days.
3.What payment methods are accepted for LMR10515YSDE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR10515YSDE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR10515YSDE/NOPB?
LMR10515YSDE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR10515YSDE/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 LMR10515YSDE/NOPB?
For technical support, including LMR10515YSDE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR10515YSDE/NOPB requirements.
6.How does Aetrix verify that LMR10515YSDE/NOPB is sourced from the original manufacturer or authorized distributors?
All LMR10515YSDE/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 LMR10515YSDE/NOPB meets industry standards.
7.What is the process for return or replacement of LMR10515YSDE/NOPB?
All LMR10515YSDE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMR10515YSDE/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 LMR10515YSDE/NOPB part is unused and in its original packaging.
Return procedure for LMR10515YSDE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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