My Inquiry
My Account
Texas Instruments LMR38025SDRRR
- Part No.:
- LMR38025SDRRR
- Manufacturer:
- Texas Instruments
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LMR38025SDRRR.pdf
- Description:
- IC REG BUCK ADJ 2.5A 12WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,336
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LMR38025SDRRR from Texas Instruments is a synchronous buck DC/DC converter designed for wide-input industrial power rails, delivering 2.5A continuous output current across 4.2V–80V input, featuring 40µA quiescent current in PFM mode, adjustable 200kHz–2.2MHz switching frequency, and integrated high- and low-side MOSFETs in a 3mm × 3mm WSON package. It supports prebiased start-up, precision enable, and spread-spectrum EMI reduction for factory automation and MHEV auxiliary supplies.
For engineers reviewing the LMR38025SDRRR datasheet, LMR38025SDRRR pinout, LMR38025SDRRR application, or LMR38025SDRRR equivalent, key selection criteria include input voltage range (4.2V–80V), output current capability (2.5A), quiescent current (40µA), thermal performance (RθJA = 54.3°C/W), and spread-spectrum EMI control - all critical for ruggedized 24V/48V industrial and transportation systems.
Technical Context
The LMR38025SDRRR employs fixed-frequency peak-current mode control with internal compensation, enabling stable regulation using minimal external components. Its integrated high-side (303mΩ) and low-side (133mΩ) NMOS switches support synchronous rectification, while programmable RT/SYNC pin enables either resistor-set frequency (200kHz–2.2MHz) or external clock synchronization (300kHz–2.1MHz).
It features precision enable with UVLO thresholds (VEN-H = 1.25V typ, VEN-L = 1.10V typ), open-drain power-good flag with built-in glitch filtering (tPGDFLT = 45µs), and robust protection including cycle-by-cycle current limit (HS: 3.9A typ), hiccup-mode short-circuit response, and thermal shutdown (163°C trip). The device operates in PFM at light load and does not support forced PWM (FPWM) - confirmed by Device Comparison Table for LMR38025SDRRR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2V to 80V - supports direct connection to unregulated industrial bus rails and withstands transient surges up to 85V absolute max. |
| Output Current | 2.5A continuous - delivers full rated load without derating at TJ ≤ 125°C with proper PCB copper area and airflow. |
| Quiescent Current | 40µA in PFM mode - enables ultra-low standby power for always-on subsystems in battery-backed or energy-sensitive applications. |
| Switching Frequency | 200kHz to 2.2MHz adjustable - allows optimization for efficiency (low fSW) or compact size (high fSW), with spread-spectrum enabled by default. |
| Reference Voltage | 1.0V ±1.5% over temperature - ensures tight output regulation accuracy when using standard 1% feedback resistors. |
| Thermal Resistance | RθJA = 54.3°C/W - requires ≥200mm² exposed thermal pad copper pour on bottom layer for full 2.5A operation at 70°C ambient. |
| Duty Cycle Range | Up to 97% - enables operation down to 4.2V VIN while regulating 5V or 3.3V outputs, critical for brownout resilience. |
Pinout & Package
The LMR38025SDRRR is housed in a 12-pin WSON (DRR) package measuring 3.00mm × 3.00mm with wettable flanks and an exposed thermal pad (EP) for enhanced thermal dissipation. The package integrates PowerPAD™ technology and requires solder paste stencil design per TI SNOA849.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 2) | Power and analog ground | Primary return path for input/output currents and feedback reference; must connect directly to thermal pad and low-impedance ground plane. |
| EN (Pin 3) | Enable control input | Logic-level input with precise UVLO (1.10V–1.25V window); connects directly to VIN for self-start or to MCU GPIO for sequencing. |
| NC (Pin 4) | No-connect | Floating pin - must remain unconnected; no internal circuitry or bond wire attached. |
| VIN (Pins 5, 6) | Main input power supply | High-current input node requiring local 10µF+ ceramic bypass capacitor placed within 2mm of pins. |
| RT/SYNC (Pin 7) | Frequency programming/sync input | Configurable as resistor-to-GND (fSW set) or high-impedance clock input (300kHz–2.1MHz sync); internal amplifier disabled during sync mode. |
| FB (Pin 8) | Feedback voltage sense | High-impedance input monitoring resistor divider output; sets VOUT via VREF = 1.0V; leakage <2.1nA minimizes divider error. |
| PG (Pin 9) | Open-drain power-good flag | Asserts low when VOUT deviates >8% from target; includes 45µs glitch filter and internal pull-down when EN = low. |
| BOOT (Pin 10) | High-side gate driver supply | Requires 100nF ceramic capacitor between BOOT and SW; critical for reliable high-side NMOS turn-on. |
| SW (Pins 11, 12) | Switch node | Connection point for power inductor; carries high di/dt switching current - demands shortest possible trace length and solid ground return. |
| EP (Thermal Pad) | Thermal and electrical ground | Must be soldered to ≥200mm² internal/external ground plane; provides primary thermal conduction path (RθJC(bot) = 4.7°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Spread-spectrum EMI reduction | ±8% oscillator modulation - lowers peak radiated emissions without external filters, easing CISPR-25 Class 5 compliance in automotive subsystems. |
| Prebiased output start-up | Supports VOUT initialization from non-zero voltage - prevents reverse current flow during hot-plug or rail sequencing in multi-rail systems. |
| Integrated current sensing | Peak HS current limit (3.9A typ) derived from RDS-ON - eliminates need for external sense resistor and associated power loss. |
| Internal soft-start | 4.2ms fixed ramp time - controls inrush current during power-up, reducing stress on input capacitors and upstream converters. |
| Ultra-low IQ PFM mode | 40µA operating current at no load - extends battery runtime in always-on telemetry nodes powered from 12V/24V vehicle batteries. |
| Wide VIN dropout operation | Regulates down to 4.2V input at near-100% duty cycle - sustains 5V output during 24V bus dips to 6V, common in industrial PLC backplanes. |
Applications
| Industrial Motor Drives | Wireless Base Station Power |
|---|---|
Use Scenario: Powering isolated gate drivers and FPGA I/O banks in servo inverters where input rails fluctuate between 24V and 56V due to regenerative braking. IC Role / Device Role / Timing Role: Primary 5V/3.3V point-of-load regulator converting unregulated 48V DC bus; provides clean, low-noise supply with fast transient response. Use Value: 40µA IQ enables energy-efficient standby during motor idle; 97% duty cycle maintains regulation during 48V bus sag to 5.2V, preventing controller reset. |
Use Scenario: Generating 12V bias for RF power amplifiers in 5G macro cell radios exposed to outdoor temperature extremes (−40°C to +85°C). IC Role / Device Role / Timing Role: High-voltage buck stage stepping down 48V telecom rectifier output; operates in PFM for low-load sleep mode and fixed-freq during active transmission. Use Value: ±1.5% VREF tolerance ensures stable PA bias across temperature; spread spectrum reduces conducted EMI coupling into sensitive RF front-end circuits. |
| Factory Automation Sensors | MHEV 12V Auxiliary Supply |
Use Scenario: Powering IO-Link masters and distributed I/O modules connected to 24V plant-wide fieldbus with frequent voltage transients. IC Role / Device Role / Timing Role: Input-stage DC/DC converter accepting 18V–32V fieldbus input; delivers regulated 5V to microcontroller and communication PHY. Use Value: 85V absolute max VIN rating absorbs 50V transients per ISO 16750-2; hiccup-mode protection isolates faults without latch-off during sensor short circuits. |
Use Scenario: Replacing traditional alternator-based 12V supply in mild hybrid electric vehicles, fed from 48V battery with cold-crank dips to 4.2V. IC Role / Device Role / Timing Role: Primary 12V system regulator supporting infotainment, ADAS cameras, and body control modules during engine stop-start cycles. Use Value: 4.2V minimum VIN and prebiased start-up ensure uninterrupted 12V output during cranking events; thermal shutdown (163°C) protects against under-hood overheating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR36025SDDAR | 60V max VIN, 2.5A, same 3mm×3mm WSON but no spread spectrum; higher IQ (65µA) | Lacks EMI mitigation features; unsuitable for automotive RF-dense environments | Select when cost sensitivity outweighs EMI requirements and input stays below 60V. |
| TPS543B20RVFT | 80V max VIN, 3A, PMBus-enabled, 12-bit VOUT margining; larger 4mm×4mm QFN | Supports digital configuration and telemetry but adds firmware overhead and layout complexity | Choose when remote monitoring, dynamic voltage scaling, or tighter output accuracy (<±0.5%) is required. |
Compared with LMR36025SDDAR, the LMR38025SDRRR offers superior EMI performance and wider input range (80V vs 60V), while TPS543B20RVFT provides digital control at the cost of increased BOM count and design effort - making LMR38025SDRRR optimal for analog-only, space-constrained, high-reliability industrial power rails.
Availability
LMR38025SDRRR is available at Aetrix Electronics and suitable for industrial motor drives, wireless infrastructure power, factory automation sensors, and MHEV auxiliary supplies requiring stable component supply across extended temperature and voltage ranges.
Supply support for LMR38025SDRRR 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-reliability industrial and automotive power conversion.
The LMR38025SDRRR belongs to TI's SIMPLE SWITCHER® family - engineered specifically for rugged, low-BOM-count DC/DC solutions in harsh environments where wide input range, low IQ, and integrated protection are mandatory.
FAQ
What is the maximum input voltage rating for the LMR38025SDRRR?
The LMR38025SDRRR has an absolute maximum input voltage rating of 85V across VIN to PGND, with recommended operating range from 4.2V to 80V. This 80V upper limit ensures reliable long-term operation under sustained industrial bus conditions, while the 85V absolute rating accommodates transient spikes per ISO 7637-2 and IEC 61000-4-5 standards. Exceeding 85V risks permanent damage.
Does the LMR38025SDRRR support forced PWM (FPWM) mode?
No, the LMR38025SDRRR does not support forced PWM mode. As confirmed in the Device Comparison Table, LMR38025SDRRR is the spread-spectrum variant without FPWM; the FPWM option is exclusive to LMR38025FDRRR. The LMR38025SDRRR operates in PFM at light loads to achieve 40µA quiescent current and transitions to fixed-frequency mode only under sufficient load - no user-selectable FPWM pin or register control exists.
How is the switching frequency set on the LMR38025SDRRR?
The switching frequency of the LMR38025SDRRR is set via a resistor (RT) connected between the RT/SYNC pin and GND. Using Equation 2 from the datasheet (RT = 30970 × fSW⁻¹·⁰²⁷), a 64.9kΩ resistor yields ~400kHz. The RT/SYNC pin cannot be left floating or shorted. For synchronization, a clean square wave (300kHz–2.1MHz, >2V high, <0.6V low) is applied directly - the internal PLL locks to falling edges, disabling the RT resistor function during sync.
What thermal design considerations apply to the LMR38025SDRRR in a 2.5A application?
At 2.5A continuous load, the LMR38025SDRRR requires careful thermal management: its RθJA is 54.3°C/W, meaning a 2W power dissipation (typical at 24V→5V) raises junction temperature by ~109°C above ambient. To stay within the 150°C max TJ, use ≥200mm² copper on the thermal pad (EP), multiple vias to inner ground planes, and avoid enclosing the device. Derating is needed above 70°C ambient unless airflow or heatsinking is added.
Can the LMR38025SDRRR start up with a prebiased output voltage?
Yes, the LMR38025SDRRR supports prebiased start-up - a key feature for systems where downstream circuitry retains charge during power cycling. During start-up, the device actively controls both high- and low-side FETs to prevent reverse current flow into the output capacitor, avoiding potential damage to downstream loads or instability. This behavior is enabled by default and requires no external configuration.
LMR38025SDRRR 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):
- 4.2V
- Voltage - Input (Max):
- 80V
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- 80V
- Current - Output:
- 2.5A
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 12-WSON (3x3)
LMR38025SDRRR FAQ
1.How can I place an order for LMR38025SDRRR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR38025SDRRR 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 LMR38025SDRRR reliable?
The price and inventory of LMR38025SDRRR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR38025SDRRR is usually 5 days.
3.What payment methods are accepted for LMR38025SDRRR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR38025SDRRR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR38025SDRRR?
LMR38025SDRRR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR38025SDRRR 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 LMR38025SDRRR?
For technical support, including LMR38025SDRRR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR38025SDRRR requirements.
6.How does Aetrix verify that LMR38025SDRRR is sourced from the original manufacturer or authorized distributors?
All LMR38025SDRRR 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 LMR38025SDRRR meets industry standards.
7.What is the process for return or replacement of LMR38025SDRRR?
All LMR38025SDRRR units undergo pre-shipment inspection (PSI). If there is an issue with LMR38025SDRRR, 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 LMR38025SDRRR part is unused and in its original packaging.
Return procedure for LMR38025SDRRR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMR38025SDRRR Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
