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Texas Instruments LMR33620BDDA
- Part No.:
- LMR33620BDDA
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMR33620BDDA.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:663
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Product details
Overview
LMR33620BDDA from Texas Instruments is a synchronous step-down DC/DC converter optimized for rugged industrial power conversion, delivering up to 2 A output current across an input range of 3.8 V to 36 V, with adjustable output voltage (1 V–24 V), fixed 1.4 MHz switching frequency, and peak efficiency exceeding 95%. It serves as the primary voltage regulator in motor drive inverters, PLC CPU rails, and HVAC control systems.
For engineers reviewing the LMR33620BDDA datasheet, LMR33620BDDA pinout, LMR33620BDDA application, or LMR33620BDDA equivalent, key selection criteria include its 1.4 MHz fixed-frequency operation, HSOIC-8 HotRod™ package with integrated compensation, precision enable threshold (1.231 V typ), power-good flag with glitch filtering, and thermal shutdown at 165°C - all critical for compact, high-reliability 24-V industrial power supplies.
Technical Context
The LMR33620BDDA implements peak-current-mode control with automatic PFM/PWM mode transition to maintain high light-load efficiency. Its architecture supports ultra-low minimum on-time (75 ns typ) and dropout operation down to 150 mV at 1 A, enabling regulation from 3.8 V input to 3.3 V output even at 2.1 MHz in compatible variants.
It integrates internal 5-V LDO (VCC), bootstrap circuitry (BOOT–SW), analog ground (AGND) with dedicated thermal pad, and open-drain power-good (PG) with 105%–107% rising threshold and 60–170 µs glitch filter - all coordinated via a single-cycle control loop without external compensation components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8 V to 36 V - supports wide-VIN industrial buses including 24-V nominal and 36-V transients. |
| Output Current | 2 A continuous - sufficient for powering FPGA I/O banks, microcontroller cores, and sensor signal chains. |
| Switching Frequency | 1.4 MHz (fixed) - enables use of small 1–2.2 µH inductors and reduces EMI fundamental below 2 MHz band. |
| Feedback Reference | 1.0 V ±1.5% - sets output accuracy for adjustable configurations using external resistor divider. |
| Quiescent Current | 25 µA (typ) - ensures low standby power in always-on building automation nodes. |
| Thermal Shutdown | 165°C (shutdown), 148°C (recovery) - provides robust overtemperature protection in enclosed enclosures. |
| Enable Threshold | 1.231 V (rising), 100 mV hysteresis - allows precise input UVLO implementation with external resistive divider. |
Pinout & Package
LMR33620BDDA is housed in an 8-pin HSOIC package (5.00 mm × 4.00 mm) with PowerPAD™ thermal pad on underside, supporting high-power density PCB layouts and efficient heat dissipation through soldered ground plane connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PGND | Power Ground | Main return path for high-current switch node; must be connected directly to system ground and AGND with short, wide traces. |
| 2 VIN | Input Supply | Primary DC input (3.8–36 V); requires local high-quality bypass capacitor to PGND for stability and EMI suppression. |
| 3 EN | Enable Input | Logic-controlled startup; 1.231 V rising threshold enables precise undervoltage lockout configuration via external divider. |
| 4 PG | Power-Good Flag | Open-drain output signaling valid regulation; pulls low during faults, startup, or EN deactivation; requires external pull-up. |
| 5 FB | Feedback Input | Senses output voltage via resistor divider; reference is 1.0 V; floating or grounded connection invalidates regulation. |
| 6 VCC | Internal LDO Output | 5-V regulated supply for internal circuitry; not for external loads; requires 1-µF capacitor to AGND. |
| 7 BOOT | Bootstrap Supply | Provides gate drive voltage for high-side MOSFET; requires 100-nF capacitor to SW pin. |
| 8 SW | Switch Node | Connection point for power inductor; carries high di/dt; layout must minimize loop area to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Compensation Network | Eliminates need for external Type-II/III compensation components, reducing BOM count and layout sensitivity. |
| HotRod™ Package | Reduces parasitic inductance and improves EMI performance by optimizing VIN/PGND symmetry and minimizing bond wire length. |
| Peak-Current-Mode Control | Enables fast transient response and inherent cycle-by-cycle current limiting for overload and short-circuit protection. |
| Automatic PFM/PWM Transition | Maintains >90% efficiency at 10-mA load while operating at constant 1.4 MHz under full load - no manual mode selection required. |
| Short Minimum On-Time (75 ns) | Supports high step-down ratios (e.g., 24 V → 3.3 V) at 1.4 MHz without pulse-skipping instability. |
Applications
| Motor Drive Inverters | PLC CPU Power Rails |
|---|---|
Use Scenario: Supplies 3.3-V or 5-V logic rails for gate drivers and microcontrollers in drone ESCs and AC variable-frequency drives. IC Role / Device Role / Timing Role: Primary buck regulator providing stable, low-noise core voltage with fast load transient response to PWM gate driver bursts. Use Value: 1.4 MHz switching enables compact magnetics; 2-A capability supports multi-channel gate driver ICs; hiccup-mode short-circuit protection prevents latch-up during motor stall events. | Use Scenario: Powers ARM Cortex-M7-based PLC CPUs and real-time Ethernet PHYs in factory automation cabinets. IC Role / Device Role / Timing Role: Main 24-V-to-5-V intermediate regulator feeding downstream LDOs; operates continuously in harsh ambient temperatures. Use Value: –40°C to +125°C junction rating ensures reliability in uncooled control panels; 25-µA quiescent current minimizes standby losses during idle cycles. |
| HVAC Control Units | Elevator Control Systems |
Use Scenario: Generates 3.3-V supply for temperature sensors, fan controllers, and CAN transceivers in commercial HVAC terminal units. IC Role / Device Role / Timing Role: Wide-input buck converter handling 24-V battery backup and rectified AC line inputs with brownout resilience. Use Value: 3.8-V minimum input supports operation during 24-V battery sag; precision enable (±10 mV threshold) enables clean sequencing with other subsystems. | Use Scenario: Delivers 5-V rail to safety-critical elevator door controllers and position encoder interfaces. IC Role / Device Role / Timing Role: Functional-safety-capable power stage meeting requirements for ASIL-B support via documented failure modes. Use Value: Power-good flag with 107% upper threshold and 60–170 µs glitch filter ensures deterministic reset behavior during voltage sags; thermal shutdown at 165°C prevents thermal runaway in confined hoistway enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR33620ADDA | Same HSOIC-8 package, but 400 kHz switching frequency - higher inductor size, lower EMI, reduced light-load efficiency. | Better suited for noise-sensitive analog subsystems where EMI filtering is prioritized over board space. | Select when 400 kHz operation simplifies EMI compliance testing and thermal management outweighs size constraints. |
| LMR33620BRNX | VQFN-12 (3 mm × 2 mm) package with wettable flanks, same 1.4 MHz frequency, lower RDS(on) (75 mΩ HS / 50 mΩ LS). | Enables higher power density and improved thermal performance in space-constrained designs like servo drive modules. | Choose when PCB area is limited and thermal resistance <72.5°C/W is required - note different pinout and layout rules. |
Compared with LMR33620ADDA, LMR33620BDDA delivers smaller solution size and better light-load efficiency at the cost of higher fundamental EMI; compared with LMR33620BRNX, it trades thermal performance and package miniaturization for legacy HSOIC compatibility and simplified assembly.
Availability
LMR33620BDDA is available at Aetrix Electronics and suitable for motor drive inverters, PLC CPU power rails, and HVAC control systems requiring stable component supply, long-term industrial lifecycle support, and AEC-Q100-qualified alternatives.
Supply support for LMR33620BDDA 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 experience in industrial-grade DC/DC regulation.
The LMR33620 product line targets rugged industrial power conversion - delivering high-efficiency, wide-input, easy-to-use synchronous buck regulators for factory automation, motor control, and building infrastructure applications.
FAQ
What is the switching frequency of the LMR33620BDDA?
The LMR33620BDDA operates at a fixed 1.4 MHz switching frequency, as specified in the device option table and confirmed in Section 7.5 of the datasheet. This frequency is factory-trimmed and not user-adjustable. It enables compact magnetic design and places the fundamental EMI energy above common AM radio bands. The LMR33620BDDA maintains this frequency across its full operating temperature and load range unless entering dropout or light-load PFM mode.
Does the LMR33620BDDA require external compensation components?
No, the LMR33620BDDA integrates a complete compensation network internally, eliminating the need for external Type-II or Type-III compensation components. This simplifies design, reduces BOM count, and improves immunity to layout variations. The internal compensation is optimized for stability with standard 1–2.2 µH inductors and ceramic output capacitors, as validated in the typical application circuit (Figure 9-2).
What package type does the LMR33620BDDA use?
The LMR33620BDDA uses an 8-pin HSOIC package with PowerPAD™ thermal pad (5.00 mm × 4.00 mm body size), designated as DDA in TI's ordering nomenclature. This thermally enhanced package features exposed copper on the underside for direct soldering to PCB ground planes, achieving a junction-to-board thermal resistance of 13.6°C/W per JEDEC simulation.
How does the power-good (PG) function operate on the LMR33620BDDA?
The LMR33620BDDA's PG pin is an open-drain output that asserts high (via external pull-up) when output voltage is within ±5% of target (105%–107% rising, 90%–95% falling thresholds). It pulls low during startup, fault conditions (overcurrent, thermal shutdown), or when EN is deasserted. A built-in 60–170 µs glitch filter prevents false triggering during transient excursions, and the flag remains valid down to 2 V input when EN = 0 V.
Is the LMR33620BDDA suitable for functional safety applications?
Yes, the LMR33620BDDA is functional safety-capable: TI provides documentation including FIT rate data, failure mode analysis, and safety manuals to support ISO 26262 and IEC 61508 system-level certification. While the base LMR33620BDDA is not AEC-Q100 qualified, an AEC-Q100-qualified variant (LMR33620BQPWPRQ1) is available for automotive safety-critical subsystems requiring ASIL-B compliance.
LMR33620BDDA 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:
- 2A
- Frequency - Switching:
- 1.4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LMR33620BDDA FAQ
1.How can I place an order for LMR33620BDDA through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR33620BDDA 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 LMR33620BDDA reliable?
The price and inventory of LMR33620BDDA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR33620BDDA is usually 5 days.
3.What payment methods are accepted for LMR33620BDDA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR33620BDDA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR33620BDDA?
LMR33620BDDA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR33620BDDA 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 LMR33620BDDA?
For technical support, including LMR33620BDDA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR33620BDDA requirements.
6.How does Aetrix verify that LMR33620BDDA is sourced from the original manufacturer or authorized distributors?
All LMR33620BDDA 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 LMR33620BDDA meets industry standards.
7.What is the process for return or replacement of LMR33620BDDA?
All LMR33620BDDA units undergo pre-shipment inspection (PSI). If there is an issue with LMR33620BDDA, 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 LMR33620BDDA part is unused and in its original packaging.
Return procedure for LMR33620BDDA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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