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Texas Instruments LMR23610ADDA
- Part No.:
- LMR23610ADDA
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMR23610ADDA.pdf
- Description:
- IC REG BUCK ADJ 1A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:1,570
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Product details
Overview
LMR23610ADDA from Texas Instruments is a 36-V, 1-A synchronous step-down DC/DC converter in an 8-pin HSOIC package with PowerPAD™. It delivers regulated output from 4 V to 36 V input, supports PFM mode for 75 µA quiescent current, features internal compensation, and integrates high- and low-side MOSFETs (RDS(on) = 185 mΩ / 105 mΩ) for industrial power conditioning in PLCs and HVAC controllers.
For engineers reviewing the LMR23610ADDA datasheet, LMR23610ADDA pinout, LMR23610ADDA application, or LMR23610ADDA equivalent, key selection considerations include its 400-kHz fixed-frequency peak-current-mode control, 60-ns minimum on-time, VIN UVLO thresholds (3.3 V rising / 2.9 V falling), hiccup-mode short-circuit protection, and thermal shutdown at 170 °C.
Technical Context
The LMR23610ADDA employs fixed-frequency peak-current-mode control with internal loop compensation, enabling stable regulation across wide input (4–36 V) and output (1–28 V) ranges without external compensation components. Its integrated high- and low-side NMOS switches support continuous 1-A output with cycle-by-cycle current limiting and zero-cross detection.
It operates in PWM mode under normal load and transitions to PFM mode at light load to maintain efficiency down to 75 µA IQ. Frequency synchronization (200 kHz–2.2 MHz) via the EN/SYNC pin and programmable UVLO using external resistors provide flexible system-level power sequencing and supply monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 36 V - supports unregulated industrial rails including 12 V, 24 V, and 36 V battery or bus supplies. |
| Output Current | 1 A continuous - sufficient for powering microcontrollers, sensors, and communication ICs in automation systems. |
| Switching Frequency | 400 kHz nominal (340–460 kHz) - balances EMI, inductor size, and efficiency; synchronizable to 200 kHz–2.2 MHz external clock. |
| Quiescent Current | 75 µA in PFM mode - enables long battery life in always-on monitoring applications. |
| Shutdown Current | 2 µA typical - minimizes standby drain in safety-critical or energy-harvested systems. |
| Reference Voltage | 1.0 V ±2% over –40°C to +125°C - ensures precise output regulation across temperature with external resistor divider. |
| Thermal Shutdown | 170 °C threshold with 15 °C hysteresis - protects against sustained overload or poor PCB thermal design. |
Pinout & Package
LMR23610ADDA uses an 8-pin HSOIC (DDA) package with exposed thermal pad (PowerPAD™), measuring 4.89 mm × 3.90 mm. The thermal pad must be soldered to a PCB ground plane for effective heat dissipation and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switch node output | Connects internally to both MOSFETs; drives external inductor; requires low-inductance layout to minimize switching losses and EMI. |
| 2 BOOT | Bootstrap capacitor connection | Supplies gate drive voltage for high-side FET; requires 470-nF ceramic capacitor between BOOT and SW. |
| 3 VCC | Internal LDO output | Provides 4.1 V bias for control circuitry; must be bypassed with 2.2-µF/16-V ceramic capacitor to AGND and thermal pad. |
| 4 FB | Feedback input | Senses output voltage via resistor divider; reference is 1.0 V; sets VOUT = 1 V × (1 + RFBT/RFBB). |
| 5 EN/SYNC | Enable and sync input | Logic-high (>1.55 V) enables operation; AC-coupled external clock (2.8–5.5 V, 200 kHz–2.2 MHz) synchronizes switching frequency. |
| 6 AGND | Analog ground reference | Ground return for feedback, reference, and internal analog circuits; must connect to system ground with low-impedance path. |
| 7 VIN | Main input supply | Accepts 4–36 V; includes UVLO (rising 3.3 V, falling 2.9 V); requires local 10-µF ceramic input capacitor. |
| 8 PGND | Power ground | Return path for low-side FET and inductor current; connects internally to thermal pad; must tie to AGND and CIN/COUT grounds. |
| Pad (Thermal) | Exposed thermal ground | Primary heat dissipation path; must be soldered to large PCB copper area connected to PGND and AGND. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode; reduces conduction loss and improves efficiency by up to 5% at full load. |
| Internal compensation | Removes need for external compensation network; simplifies design and reduces BOM count while ensuring stability with most ceramic output capacitors. |
| Soft-start into prebiased output | Prevents reverse current flow when powering up into an already-biased rail-critical for hot-swap and redundant power systems. |
| Hiccup-mode short-circuit protection | Disables switching after 64 consecutive current-limit cycles, then retries every 5 ms-limits power dissipation during sustained fault conditions. |
| Precision enable with UVLO programming | EN pin threshold (1.55 V typ.) and hysteresis (0.4 V) allow accurate system-level undervoltage lockout using two external resistors. |
Applications
| PLC CPU Power Supply | HVAC Control Module |
|---|---|
|
Use Scenario: Powers ARM Cortex-M7 MCU, CAN transceiver, and analog front-end in industrial programmable logic controller cabinets operating from 24 V DC bus. IC Role / Device Role / Timing Role: Primary 3.3 V or 5 V point-of-load regulator delivering 1 A with tight line/load regulation and low-noise output. Use Value: Wide 4–36 V input range accommodates bus voltage sag and ripple; 75 µA quiescent current extends backup battery runtime during brownout events. |
Use Scenario: Supplies 5 V to microcontroller, temperature/humidity sensor array, and relay drivers in commercial building HVAC control panels. IC Role / Device Role / Timing Role: Main DC/DC converter regulating from 12–24 V field wiring to stable 5 V rail with hiccup-mode fault containment. Use Value: Thermal shutdown (170 °C) and cycle-by-cycle current limit prevent damage during relay coil inrush or sensor short circuits. |
| GSM/GPRS Fleet Telematics | Smart Grid Sensor Node |
|
Use Scenario: Powers LTE-M module, GPS receiver, and flash memory in vehicle-mounted telematics units powered by automotive battery (9–16 V nominal, up to 36 V load dump). IC Role / Device Role / Timing Role: Input-stage buck regulator converting battery voltage to 3.3 V for digital subsystems with PFM efficiency optimization. Use Value: 2 µA shutdown current preserves battery charge during vehicle ignition-off periods; 60 ns minimum on-time supports high-duty-cycle operation at low VIN. |
Use Scenario: Regulates 12 V solar or battery input to 3.3 V for NB-IoT modem, environmental sensors, and secure element in outdoor smart grid metering nodes. IC Role / Device Role / Timing Role: High-reliability, wide-temperature (-40°C to +125°C) DC/DC converter with robust ESD (±2000 V HBM) and thermal protection. Use Value: Internal LDO (VCC = 4.1 V) powers gate drivers independently of output rail; frequency foldback maintains regulation down to 5.5 V input at 5 V output. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR23625ADDA | 2.5-A output current, identical 4–36 V input, same 8-pin HSOIC package and pinout. | Higher current capability suits dual-rail systems or future-proofing; requires larger inductor and output capacitance. | Select when >1 A load margin is required or when designing across LMR236x family for layout reuse. |
| TPS54331DR | 3-A output, 3.5–28 V input, SOIC-8 package; no integrated low-side FET (external diode required); higher 125 µA IQ. | Lacks synchronous rectification and PFM mode; less efficient at light load; lower max input voltage limits use in 36 V industrial systems. | Consider only if cost sensitivity outweighs efficiency and input voltage requirements; not drop-in compatible. |
Compared with LMR23610ADDA, LMR23625ADDA offers scalable current capacity in identical footprint, while TPS54331DR trades integration and wide-VIN capability for lower unit cost-making LMR23610ADDA optimal for space-constrained, battery-sensitive, or high-input-voltage industrial designs.
Availability
LMR23610ADDA is available at Aetrix Electronics and suitable for factory automation, building HVAC control, and fleet telematics requiring stable component supply, long-term manufacturability, and guaranteed traceability.
Supply support for LMR23610ADDA 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 technologies, with decades of expertise in high-reliability industrial and automotive power solutions.
The LMR23610ADDA belongs to TI's SIMPLE SWITCHER® family-designed specifically for ease of use in wide-input-voltage industrial power conversion, emphasizing internal compensation, robust protection, and minimal external component count.
FAQ
What is the maximum input voltage rating for the LMR23610ADDA?
The LMR23610ADDA has an absolute maximum input voltage rating of 42 V, but its recommended operating input voltage range is 4 V to 36 V. Operation above 36 V may trigger internal UVLO or cause reliability concerns; sustained exposure beyond 42 V risks permanent damage per Absolute Maximum Ratings.
Does the LMR23610ADDA require external compensation components?
No, the LMR23610ADDA features fully internal compensation, eliminating the need for external Type-II or Type-III compensation networks. This simplifies design, reduces BOM count, and ensures stable loop response across its full operating range-including with all-ceramic output capacitors-though a feedforward capacitor (CFF) across RFBT is recommended for optimal transient performance.
How does the EN/SYNC pin function in the LMR23610ADDA?
The EN/SYNC pin serves dual roles: as a precision enable input (1.55 V typical threshold, 0.4 V hysteresis) for controlled startup/shutdown, and as a synchronization interface. When AC-coupled with a ≥2.8 V peak-to-peak external clock signal (200 kHz–2.2 MHz), it forces the LMR23610ADDA to align its switching frequency-reducing system-level EMI through deterministic timing.
What thermal management provisions does the LMR23610ADDA include?
The LMR23610ADDA incorporates thermal shutdown at 170 °C (±8 °C) with 15 °C hysteresis, plus junction-to-ambient thermal resistance (RθJA) of 42.0 °C/W in the DDA package. Effective cooling requires soldering the exposed thermal pad to a multi-layer PCB ground plane; RθJB = 23.4 °C/W confirms board conduction is the dominant heat path.
Can the LMR23610ADDA operate with a 3.3 V output, and what resistor values are recommended?
Yes, the LMR23610ADDA supports 3.3 V output using the FB pin and a resistor divider. With VREF = 1.0 V, set RFBB = 10 kΩ and calculate RFBT = 23 kΩ (using RFBT = RFBB × (VOUT/VREF − 1)). Use 1% tolerance, low-TCR resistors; keep RFBT between 10 kΩ and 100 kΩ for noise immunity and light-load efficiency balance.
LMR23610ADDA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 28V
- Current - Output:
- 1A
- Frequency - Switching:
- 400kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LMR23610ADDA FAQ
1.How can I place an order for LMR23610ADDA through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR23610ADDA 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 LMR23610ADDA reliable?
The price and inventory of LMR23610ADDA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR23610ADDA is usually 5 days.
3.What payment methods are accepted for LMR23610ADDA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR23610ADDA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR23610ADDA?
LMR23610ADDA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR23610ADDA 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 LMR23610ADDA?
For technical support, including LMR23610ADDA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR23610ADDA requirements.
6.How does Aetrix verify that LMR23610ADDA is sourced from the original manufacturer or authorized distributors?
All LMR23610ADDA 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 LMR23610ADDA meets industry standards.
7.What is the process for return or replacement of LMR23610ADDA?
All LMR23610ADDA units undergo pre-shipment inspection (PSI). If there is an issue with LMR23610ADDA, 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 LMR23610ADDA part is unused and in its original packaging.
Return procedure for LMR23610ADDA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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