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Texas Instruments LMR23615QDRRRQ1
- Part No.:
- LMR23615QDRRRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LMR23615QDRRRQ1.pdf
- Description:
- IC REG BUCK ADJ 1.5A 12SON
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LMR23615QDRRRQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified 36-V, 1.5-A synchronous step-down DC/DC converter with 4–36 V input range, internal compensation, and PFM light-load mode-designed for automotive infotainment power rails, USB charging modules, and off-battery industrial systems.
For engineers reviewing the LMR23615QDRRRQ1 datasheet, LMR23615QDRRRQ1 pinout, LMR23615QDRRRQ1 application, or LMR23615QDRRRQ1 equivalent, key selection considerations include its 60-ns minimum on-time, 400-kHz default switching frequency (adjustable 200 kHz–2.2 MHz), 75 µA quiescent current, hiccup-mode short-circuit protection, and WSON-12 wettable flanks package for automotive thermal reliability.
Technical Context
The LMR23615QDRRRQ1 employs fixed-frequency peak-current-mode control with internal loop compensation, enabling stable regulation across wide VIN (4–36 V) and VOUT (1–28 V) ranges without external compensation components. Its integrated high-side (160 mΩ) and low-side (95 mΩ) MOSFETs support continuous 1.5-A output with cycle-by-cycle current limiting and thermal shutdown at 170°C.
It features dual enable/synchronization functionality: precision EN threshold (1.55 V typ.) with 0.4-V hysteresis for system sequencing, and AC-coupled SYNC input (200 kHz–2.2 MHz) with 2.8-V amplitude threshold. Frequency foldback extends dropout performance by reducing fSW when TOFF_MIN (100 ns) is reached, maintaining regulation down to ~5.5 V at 5-V output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 36 V - supports direct connection to automotive battery (cold crank to load dump) without pre-regulation. |
| Output Current | 1.5 A continuous - sufficient for powering SoCs, display drivers, and USB PD sink circuits in automotive clusters. |
| Switching Frequency | 400 kHz default (RT open); adjustable 200 kHz–2.2 MHz - enables EMI optimization and inductor size trade-offs. |
| Quiescent Current | 75 µA - extends battery runtime in always-on vehicle modules (e.g., telematics, CAN gateways). |
| Shutdown Current | 2 µA max - minimizes parasitic drain during vehicle sleep modes. |
| Min. On-Time | 60 ns - enables high-duty-cycle operation (e.g., 5 V out from 6 V in) without pulse-skipping instability. |
| Thermal Shutdown | 170°C with 15°C hysteresis - protects against sustained overload in sealed enclosures. |
Pinout & Package
LMR23615QDRRRQ1 is housed in a 3.00 mm × 3.00 mm, 12-pin WSON package with exposed thermal pad (PowerPAD™), optimized for automotive PCB assembly and thermal dissipation (RθJA = 41.5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2 SW | Switch node | Connects to inductor; carries high di/dt switching current; requires tight layout to minimize EMI and voltage spikes. |
| 3 BOOT | Bootstrap supply | Drives high-side MOSFET gate; requires 100-nF ceramic capacitor between BOOT and SW for reliable turn-on. |
| 4 VCC | Internal LDO output | Supplies bias for control circuitry; must be bypassed with 2.2-µF ceramic cap to AGND/PGND; no external load permitted. |
| 5 FB | Voltage feedback input | Senses output via resistor divider; 1-V internal reference enables precise VOUT setting (e.g., 3.3 V, 5 V, 12 V). |
| 6 RT | Frequency programming | Resistor to AGND sets fSW; open-circuit = 400 kHz; 17.8 kΩ = 2.2 MHz; not to be shorted to ground. |
| 7 AGND | Analog ground | Reference for FB, EN/SYNC, and internal references; separate from PGND but tied at single point on PCB. |
| 8 EN/SYNC | Enable & sync input | Logic-level enable (1.55 V threshold); also accepts AC-coupled external clock (200 kHz–2.2 MHz) for EMI reduction. |
| 9,10 VIN | Main input supply | Accepts 4–36 V; requires low-ESR input capacitor close to pins 9/10 and PGND for stability under transients. |
| 11 NC | No connect | Not internally bonded; must remain unconnected and unpopulated on PCB. |
| 12 PGND | Power ground | Low-side MOSFET source return; connects to CIN/COUT grounds and thermal pad; shortest possible path required. |
| PAD | Thermal pad | Primary heat path to PCB ground plane; must be soldered to solid copper area ≥ 100 mm² for thermal compliance. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation, HBM ±2.5 kV, CDM ±1 kV - meets automotive functional safety baseline requirements. |
| Integrated synchronous FETs | 160 mΩ HS / 95 mΩ LS MOSFETs eliminate external rectifier losses and reduce BOM count by two components. |
| PFM light-load mode | Enables >85% efficiency at 1 mA load (VIN = 12 V, VOUT = 5 V), critical for always-on vehicle subsystems. |
| Soft-start into prebiased output | Prevents reverse current flow when enabling into powered rail - essential for hot-swap and multi-rail sequencing. |
| Hiccup-mode short-circuit protection | Enters 10-ms retry cycle after 64 consecutive current-limit events - prevents thermal runaway during sustained fault. |
Applications
| Automotive Infotainment Cluster | USB-C Charging Module |
|---|---|
Use Scenario: Powering TFT-LCD display, touch controller, and audio amplifier in digital instrument cluster with 12-V battery input. IC Role / Device Role / Timing Role: Primary 5-V/1.5-A buck regulator delivering clean, low-noise power with fast transient response to dynamic display backlight loads. Use Value: 60-ns min-on-time enables stable 5-V output even during cold-crank (6.5-V battery dip), avoiding display reset or flicker. |
Use Scenario: Generating 5-V/1.5-A bus for USB Type-A/C ports in vehicle center console, fed from 12-V battery rail. IC Role / Device Role / Timing Role: High-efficiency DC/DC stage converting unregulated battery to regulated USB VBUS with PFM mode for standby efficiency. Use Value: 75 µA IQ and 2 µA shutdown current extend accessory battery life during parked state; hiccup protection prevents port damage during cable short. |
| Off-Battery Industrial Sensor Node | Telematics Control Unit (TCU) Core Rail |
Use Scenario: Powering low-power MCU, CAN transceiver, and environmental sensors in battery-backed fleet monitoring device. IC Role / Device Role / Timing Role: Always-on 3.3-V/1.5-A supply with ultra-low IQ and robust UVLO (3.3 V rising threshold) to prevent brownout resets. Use Value: Internal compensation eliminates tuning effort; WSON-12 wettable flanks ensure IPC Class 3 solder joint inspection for long-life deployments. |
Use Scenario: Providing 1.2-V/1.5-A core voltage to LTE modem SoC in automotive TCU operating across temperature extremes. IC Role / Device Role / Timing Role: Secondary buck stage stepping down 5-V intermediate rail to SoC core voltage with precise enable sequencing. Use Value: Adjustable fSW allows EMI alignment with cellular band gaps; EN/SYNC pin enables synchronized switching with baseband processor clock. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR23625QDRRRQ1 | 2.5-A output current, identical pinout and package - higher current headroom with same PCB layout. | Required where peak load exceeds 1.5 A (e.g., multi-display clusters with active cooling fans). | Select when future-proofing for higher current or sharing layout with 2.5-A variant family. |
| TPS543320RSAR | 3-A output, 4–18-V input, PMBus interface, and adaptive on-time control - no internal compensation required. | Used in designs needing digital telemetry (VOUT/IOUT monitoring) or tighter line/load regulation (<±0.5%). | Choose when system-level telemetry, tighter accuracy, or wider input range (up to 18 V) is prioritized over cost and simplicity. |
Compared with LMR23615QDRRRQ1, the LMR23625QDRRRQ1 offers higher current in identical footprint for seamless upgrade, while the TPS543320RSAR adds digital control and tighter regulation at the cost of increased complexity and narrower input range.
Availability
LMR23615QDRRRQ1 is available at Aetrix Electronics and suitable for automotive infotainment systems, USB charging modules, and off-battery industrial sensor nodes requiring stable component supply with full AEC-Q100 traceability and extended temperature support.
Supply support for LMR23615QDRRRQ1 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 deep expertise in automotive-grade reliability and functional safety design.
The LMR23615QDRRRQ1 belongs to TI's SIMPLE SWITCHER® automotive DC/DC converter family, engineered specifically for robust, low-risk power conversion in harsh-temperature vehicle environments without requiring external compensation.
FAQ
What is the maximum output voltage supported by the LMR23615QDRRRQ1?
The LMR23615QDRRRQ1 supports output voltages from 1 V to 28 V, set by an external resistor divider on the FB pin using the internal 1-V reference. At VOUT = 28 V, minimum input must exceed 29.5 V to maintain regulation, constrained by the 36-V absolute maximum VIN rating and 60-ns minimum on-time.
Does the LMR23615QDRRRQ1 require external compensation components?
No, the LMR23615QDRRRQ1 features fully internal compensation, eliminating the need for external Type II or Type III compensation networks. This simplifies design and improves robustness across output capacitor types and values, though a feed-forward capacitor (CFF) across RFBT is recommended for optimal transient response with ceramic outputs.
Can the LMR23615QDRRRQ1 synchronize to an external clock, and what are the timing requirements?
Yes, the LMR23615QDRRRQ1 supports synchronization via its EN/SYNC pin. An AC-coupled positive-edge clock signal (200 kHz–2.2 MHz) with ≥2.8-V peak-to-peak amplitude and ≥100-ns minimum ON/OFF time must be applied through a 1-nF capacitor. The internal oscillator locks to the external edge, enabling EMI reduction in noise-sensitive automotive systems.
How does the LMR23615QDRRRQ1 handle short-circuit conditions?
The LMR23615QDRRRQ1 implements hiccup-mode short-circuit protection: after 64 consecutive valley current limit trips, it shuts down for 10 ms before retrying. This limits average power dissipation and prevents thermal damage during sustained faults, unlike constant-current limiting which could overheat the die in enclosed automotive enclosures.
What is the thermal performance of the LMR23615QDRRRQ1 in its WSON-12 package?
In the 3-mm × 3-mm WSON-12 package with exposed thermal pad, the LMR23615QDRRRQ1 achieves RθJA = 41.5°C/W (JEDEC standard board) and RθJC(bot) = 16.3°C/W. With proper PCB copper area (≥100 mm²) connected to the PAD, it sustains 1.5-A continuous output at +125°C ambient without derating - validated per AEC-Q100 Grade 1 thermal testing.
LMR23615QDRRRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 12-WFDFN 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):
- 4V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 28V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 2.425MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 12-SON (3x3)
LMR23615QDRRRQ1 FAQ
1.How can I place an order for LMR23615QDRRRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR23615QDRRRQ1 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 LMR23615QDRRRQ1 reliable?
The price and inventory of LMR23615QDRRRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR23615QDRRRQ1 is usually 5 days.
3.What payment methods are accepted for LMR23615QDRRRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR23615QDRRRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR23615QDRRRQ1?
LMR23615QDRRRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR23615QDRRRQ1 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 LMR23615QDRRRQ1?
For technical support, including LMR23615QDRRRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR23615QDRRRQ1 requirements.
6.How does Aetrix verify that LMR23615QDRRRQ1 is sourced from the original manufacturer or authorized distributors?
All LMR23615QDRRRQ1 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 LMR23615QDRRRQ1 meets industry standards.
7.What is the process for return or replacement of LMR23615QDRRRQ1?
All LMR23615QDRRRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR23615QDRRRQ1, 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 LMR23615QDRRRQ1 part is unused and in its original packaging.
Return procedure for LMR23615QDRRRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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