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Texas Instruments LMR33630ADDA
- Part No.:
- LMR33630ADDA
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMR33630ADDA.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:1,580
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Product details
Overview
LMR33630ADDA from Texas Instruments is a synchronous step-down DC/DC converter optimized for rugged industrial power conversion, delivering up to 3 A output current from a 3.8 V–36 V input range, with adjustable 1 V–24 V output voltage, 400 kHz fixed switching frequency, and peak efficiency exceeding 95% in VQFN evaluation conditions - deployed in motor drive inverters, PLC CPU supplies, and HVAC control systems.
For engineers reviewing the LMR33630ADDA datasheet, LMR33630ADDA pinout, LMR33630ADDA application, or LMR33630ADDA equivalent, key selection considerations include its HSOIC-8 package thermal performance (RθJA = 42.9°C/W), precision enable thresholds (VEN-H = 1.231 V typ), integrated compensation, and functional-safety documentation support - critical for industrial-grade power rail design and long-term BOM stability.
Technical Context
The LMR33630ADDA implements peak-current-mode control with automatic PFM/PWM mode transition to sustain high light-load efficiency (25 µA quiescent current) while maintaining tight regulation across –40°C to +125°C junction temperature. Its internal 5-V VCC LDO powers control circuitry and supports PG flag logic, eliminating external bias supplies.
It features cycle-by-cycle current limiting, hiccup-mode short-circuit protection, thermal shutdown at 165°C, and input UVLO with hysteresis - all enabled by a fully integrated architecture requiring no external compensation components. The 75 mΩ/50 mΩ RDS(on) MOSFET pair (DDA package: 95/66 mΩ) enables high-power-density operation with minimal conduction loss.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8 V to 36 V - supports wide-input industrial rails including 24 V nominal and 36 V transients without external pre-regulation. |
| Output Current | 3 A continuous - sufficient for powering FPGA I/O banks, microcontroller cores, and servo driver logic sections. |
| Switching Frequency | 400 kHz (fixed) - balances EMI suppression, inductor size, and efficiency for mid-power industrial applications. |
| Feedback Reference | 1.0 V ±1.5% - enables precise output regulation with standard resistor-divider networks and stable loop response. |
| Quiescent Current | 25 µA (typ) - ensures ultra-low standby power in always-on control modules and battery-backed systems. |
| Min On-Time | 75 ns (DDA package) - allows high step-down ratios (e.g., 24 V → 3.3 V) at 400 kHz without pulse-skipping instability. |
| Thermal Shutdown | 165°C activation / 148°C recovery - provides robust overtemperature protection with hysteresis to prevent thermal cycling. |
Pinout & Package
The LMR33630ADDA is housed in an 8-pin HSOIC package (5.00 mm × 4.00 mm) with PowerPAD™ thermal pad on the underside, requiring solder connection to PCB ground plane for optimal thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PGND | Power Ground | Main return path for high-current switch node; must be connected to system ground and AGND via low-inductance layout. |
| 2 - VIN | Input Supply | Primary DC input (3.8–36 V); requires local ceramic bypass capacitor directly to PGND for EMI suppression. |
| 3 - EN | Enable Control | Logic-level input with precision thresholds (1.231 V turn-on); connects directly to VIN if UVLO not required. |
| 4 - PG | Power-Good Flag | Open-drain output signaling valid regulation (105–110% / 90–95% FB window); requires external pull-up resistor. |
| 5 - FB | Feedback Input | Analog input sensing output voltage divider; referenced to 1.0 V internal reference for adjustable VOUT configuration. |
| 6 - VCC | Internal LDO Output | 5-V regulated supply for internal circuits; decoupled with 1-µF capacitor to AGND; not for external loading. |
| 7 - BOOT | Bootstrap Supply | Drives high-side MOSFET gate; requires 100-nF ceramic capacitor between BOOT and SW pins. |
| 8 - SW | Switch Node | Connection point for external power inductor; carries high dv/dt switching waveform - requires minimized trace area. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Compensation Network | Eliminates external Type-II/III compensation components - reduces solution size and accelerates design validation. |
| Peak-Current-Mode Control | Provides inherent cycle-by-cycle current limiting and fast transient response without external slope compensation. |
| Power-Good Flag with Glitch Filter | 60–170 µs filter prevents false resets during load transients; supports reliable system sequencing and fault detection. |
| Functional Safety Documentation Support | TI provides FIT rate data, failure mode analysis, and safety manual - enabling ISO 26262 or IEC 61508 system-level certification. |
| Low EMI HotRod™-Inspired Layout | HSOIC pinout minimizes parasitic loop inductance; symmetrical VIN/PGND routing reduces magnetic field coupling and radiated emissions. |
Applications
| Motor Drive Inverters | PLC CPU Power |
|---|---|
Use Scenario: Supplies 3.3 V or 5 V logic rails for gate drivers, position encoders, and MCU subsystems in drone ESCs and AC variable-frequency drives. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator providing clean, efficient, and thermally robust intermediate voltage rails. Use Value: 95% peak efficiency and 125°C junction rating ensure stable operation under continuous motor stall conditions and ambient temperatures up to 85°C. | Use Scenario: Powers ARM Cortex-M7-based PLC controllers with real-time Ethernet interfaces and analog I/O conditioning circuitry. IC Role / Device Role / Timing Role: Main system regulator delivering tightly regulated 3.3 V at 3 A with power-good signaling for safe boot sequence coordination. Use Value: Precision enable threshold (±10 mV) and 4 ms soft-start prevent brownout-induced firmware corruption during cold start or line sag events. |
| HVAC Control Units | Elevator Safety Logic |
Use Scenario: Generates 5 V for HVAC controller MCUs, CAN transceivers, and sensor signal chains in commercial building automation panels. IC Role / Device Role / Timing Role: Industrial-grade DC/DC converter supporting wide-input 24 V DC bus with transient tolerance up to 36 V. Use Value: Input UVLO with hysteresis (VEN-HYS = 100 mV) prevents erratic restarts during 24 V bus fluctuations caused by compressor cycling. | Use Scenario: Supplies redundant 3.3 V safety-critical logic rails for elevator door interlock monitors and emergency brake controllers. IC Role / Device Role / Timing Role: Functional-safety-capable power IC with documented FIT rate and failure modes for ASIL-B system integration. Use Value: Thermal shutdown with 17°C hysteresis and hiccup-mode short-circuit protection ensure fail-safe behavior without latch-up during wiring faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR33630BDDA | 1.4 MHz switching frequency; identical HSOIC-8 package and 3 A rating. | Better suited for space-constrained designs needing smaller inductors and reduced output capacitance. | Select when board area is limited and higher-frequency operation improves EMI filtering requirements. |
| LMR33630ARNX | VQFN-12 (3 mm × 2 mm) package; same 400 kHz frequency; lower RDS(on) (75/50 mΩ). | Superior thermal performance (RθJB = 23.3°C/W) and wettable flanks for automated optical inspection. | Choose for higher power density, improved thermal management, or production AOI compatibility. |
Compared with LMR33630BDDA and LMR33630ARNX, the LMR33630ADDA offers the lowest-cost HSOIC solution for 400 kHz industrial buck conversion - balancing thermal capability, layout simplicity, and cost without sacrificing functional safety documentation or reliability.
Availability
LMR33630ADDA is available at Aetrix Electronics and suitable for motor drive inverters, PLC CPU power supplies, and HVAC control units requiring stable component supply, long-lifecycle support, and full traceability through TI's authorized distribution channel.
Supply support for LMR33630ADDA 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 industrial-grade product development and automotive qualification expertise.
The LMR33630 series belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically for rugged, easy-to-use DC/DC conversion in factory automation, energy infrastructure, and transportation systems where reliability, thermal resilience, and design simplicity are paramount.
FAQ
What is the maximum input voltage rating for the LMR33630ADDA?
The LMR33630ADDA has an absolute maximum input voltage rating of 38 V, but its recommended operating input voltage range is 3.8 V to 36 V. Operation above 36 V risks exceeding safe operating area limits and may trigger overvoltage protection or cause permanent damage. Always maintain input transients within this 36 V limit using appropriate front-end clamping or filtering for industrial environments.
Does the LMR33630ADDA require external compensation components?
No, the LMR33630ADDA integrates a complete compensation network internally, eliminating the need for external Type-II or Type-III compensation components. This simplifies PCB layout, reduces bill-of-materials count, and accelerates design validation - confirmed in Section 8.3.4 of the official datasheet SNVSAN3F. The LMR33630ADDA achieves stable loop response across its full operating range without user-adjustable compensation.
What is the purpose of the VCC pin on the LMR33630ADDA?
On the LMR33630ADDA, the VCC pin delivers a regulated 5 V output from an internal LDO used exclusively to power internal control circuitry. It must be decoupled with a 1-µF capacitor to AGND and must not supply external loads. Using VCC as a logic supply for the PG pin is permissible, but connecting any external circuitry that draws >100 µA will degrade regulation accuracy and thermal performance of the LMR33630ADDA.
How does the power-good (PG) flag behave during startup of the LMR33630ADDA?
During startup, the LMR33630ADDA asserts the open-drain PG flag high approximately 4 ms after the EN pin exceeds its 1.231 V turn-on threshold - this delay ensures output voltage settles within regulation before signaling "power good." The PG flag remains low during undervoltage, overcurrent, thermal shutdown, or EN deactivation, and includes a 60–170 µs glitch filter to ignore brief transients. This behavior is fully characterized in Section 7.5 of the LMR33630ADDA datasheet.
Can the LMR33630ADDA be used in automotive applications?
The LMR33630ADDA itself is not AEC-Q100 qualified; however, the LMR33630 family includes AEC-Q100-qualified variants (e.g., LMR33630AQDDAR). For automotive use, engineers must select those qualified versions - the LMR33630ADDA is rated for industrial temperature range (–40°C to +125°C) and intended for factory automation, HVAC, and motor control, not automotive ECUs or ADAS systems requiring certified reliability.
LMR33630ADDA 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):
- 3.8V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 24V
- Current - Output:
- 3A
- 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
LMR33630ADDA FAQ
1.How can I place an order for LMR33630ADDA through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR33630ADDA 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 LMR33630ADDA reliable?
The price and inventory of LMR33630ADDA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR33630ADDA is usually 5 days.
3.What payment methods are accepted for LMR33630ADDA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR33630ADDA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR33630ADDA?
LMR33630ADDA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR33630ADDA 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 LMR33630ADDA?
For technical support, including LMR33630ADDA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR33630ADDA requirements.
6.How does Aetrix verify that LMR33630ADDA is sourced from the original manufacturer or authorized distributors?
All LMR33630ADDA 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 LMR33630ADDA meets industry standards.
7.What is the process for return or replacement of LMR33630ADDA?
All LMR33630ADDA units undergo pre-shipment inspection (PSI). If there is an issue with LMR33630ADDA, 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 LMR33630ADDA part is unused and in its original packaging.
Return procedure for LMR33630ADDA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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