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Texas Instruments LMR33620CDDA
- Part No.:
- LMR33620CDDA
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMR33620CDDA.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:846
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Product details
Overview
LMR33620CDDA from Texas Instruments is a synchronous step-down DC/DC converter optimized for rugged industrial power supplies, delivering up to 2 A output current from 3.8 V to 36 V input, with fixed 2.1 MHz switching frequency, 1 V to 24 V adjustable output voltage, and peak efficiency exceeding 95%. It serves as the primary voltage regulator in motor drive inverters and PLC CPU power rails.
For engineers reviewing the LMR33620CDDA datasheet, LMR33620CDDA pinout, LMR33620CDDA application, or LMR33620CDDA equivalent, key selection criteria include its 2.1 MHz operation enabling ultra-compact filter design, integrated compensation eliminating external loop components, precision enable thresholds (1.231 V typical turn-on), and HotRod™ HSOIC-8 package with PowerPAD™ thermal pad for high-power-density layouts.
Technical Context
The LMR33620CDDA implements peak-current-mode control with automatic PFM/PWM mode transition to maintain >95% efficiency across 1 mA to 2 A load range. Its 68 ns minimum on-time (VQFN) / 75 ns (HSOIC) enables 3.8 V–to–3.3 V conversion at 2.1 MHz without dropout.
It integrates a 5-V internal LDO (VCC), open-drain power-good flag with 105–110% rising threshold and 60–170 µs glitch filter, cycle-by-cycle current limit (3.5 A typical high-side), and thermal shutdown at 165°C with 148°C hysteresis recovery - all within an 8-pin HSOIC package featuring symmetrical VIN/PGND layout for EMI reduction.
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. |
| Switching Frequency | 2.1 MHz ±0.3 MHz - enables use of sub-2.2 µH inductors and <10 µF ceramic output capacitors. |
| Output Current | 2 A continuous - sufficient for powering dual-core microcontrollers, gate drivers, and analog front-ends. |
| Feedback Reference | 1.000 V ±15 mV - ensures ±1.5% output regulation over line/load/temperature with minimal external resistor tolerance impact. |
| Quiescent Current | 25 µA typical - extends battery life in always-on industrial sensors and remote I/O modules. |
| Thermal Shutdown | 165°C activation / 148°C recovery - provides robust protection during sustained overload or poor heatsinking. |
| Enable Threshold | 1.231 V typical rising / 1.131 V falling - allows precise input UVLO via external resistor divider without external comparators. |
Pinout & Package
LMR33620CDDA uses an 8-pin HSOIC package with PowerPAD™ thermal pad (5.00 mm × 4.00 mm), where the exposed pad must be soldered to a 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 connect directly to thermal pad and system ground plane with short, wide traces. |
| 2 VIN | Input Supply | Primary input rail connection; requires low-ESR ceramic capacitor placed adjacent to pin and PGND. |
| 3 EN | Enable Control | Logic-level input with precision 1.231 V turn-on threshold; connects directly to VIN if always-on operation is required. |
| 4 PG | Power-Good Flag | Open-drain output signaling valid regulation; requires external pull-up to VCC or VOUT (100 kΩ typical). |
| 5 FB | Feedback Input | High-impedance reference node for output voltage setting; connects to resistor divider tap point with minimal trace length. |
| 6 VCC | Internal LDO Output | 5-V regulated supply for internal circuitry; decoupled with 1 µF ceramic capacitor to AGND. |
| 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 power inductor; carries high di/dt switching current and must be routed with minimal loop area. |
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 with PowerPAD™ | Reduces parasitic inductance by >50% vs standard SOIC, minimizing switch-node ringing and conducted EMI. |
| Peak-Current-Mode Control | Enables fast transient response (<10 µs) and stable operation with ceramic output capacitors down to 10 µF. |
| Automatic PFM/PWM Transition | Maintains >85% efficiency at 1 mA load while delivering full 2 A capability - ideal for mixed-signal systems with burst-mode operation. |
| Short Minimum On-Time (75 ns) | Supports 3.8 V–to–3.3 V conversion at 2.1 MHz without pulse-skipping, ensuring tight regulation under light-load dropout conditions. |
Applications
| Motor Drive Inverters | PLC CPU Power Rails |
|---|---|
Use Scenario: Providing isolated 5 V/2 A bias supply for IGBT gate drivers and current sensing amplifiers in 3-phase AC inverters. IC Role / Device Role / Timing Role: Primary buck regulator converting 24 V bus to stable 5 V for logic and analog subsystems. Use Value: 2.1 MHz operation minimizes inductor size and EMI filtering requirements, critical for compact drone motor controllers. | Use Scenario: Generating 3.3 V/2 A for ARM Cortex-M7-based PLC CPUs operating in factory automation cabinets. IC Role / Device Role / Timing Role: Main system regulator powering microcontroller core, peripherals, and communication interfaces. Use Value: Integrated power-good flag enables safe CPU reset during brownout, while 125°C junction rating ensures reliability in uncooled enclosures. |
| HVAC Control Units | Elevator Control Systems |
Use Scenario: Delivering 12 V/2 A to HVAC fan motor controllers and temperature sensor signal chains in building management systems. IC Role / Device Role / Timing Role: Wide-input buck converter supporting 12–36 V DC bus variations across HVAC equipment models. Use Value: 3.8 V minimum input enables reliable start-up during battery-backed operation during mains failure. | Use Scenario: Supplying 5 V/2 A to elevator door controller MCUs and CAN transceivers in safety-critical vertical transport systems. IC Role / Device Role / Timing Role: Functional-safety-capable power stage meeting ASIL-B readiness requirements via documented FMEA support. Use Value: Precision enable thresholds allow programmable input UVLO to prevent erratic behavior during line sag events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR33620BDDA | 1.4 MHz switching frequency; higher RDS(on) (95–160 mΩ HS) than LMR33620CDDA's 2.1 MHz variant. | Better suited for cost-sensitive designs where larger inductors/capacitors are acceptable. | Select when board space is less constrained and EMI filtering budget allows lower-frequency operation. |
| TPS54202DDA | 2.2 MHz fixed frequency, but only 1.5 A rated output and no integrated power-good flag. | Lacks functional safety documentation and thermal shutdown hysteresis data required for industrial certification. | Choose only for non-safety-critical consumer-grade applications needing slightly higher frequency but lower current. |
Compared with LMR33620BDDA and TPS54202DDA, the LMR33620CDDA delivers highest power density (2 A @ 2.1 MHz in HSOIC-8), includes functional safety documentation, and offers tighter enable threshold accuracy - making it optimal for space-constrained, certified industrial power rails.
Availability
LMR33620CDDA is available at Aetrix Electronics and suitable for motor drive inverters, PLC CPU power rails, HVAC control units, and elevator control systems requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LMR33620CDDA 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 industrial-grade reliability validation.
The LMR33620 series belongs to TI's SIMPLE SWITCHER® portfolio, designed specifically for rugged, wide-input-voltage DC/DC conversion in factory automation, motor control, and building infrastructure applications.
FAQ
What is the switching frequency of the LMR33620CDDA?
The LMR33620CDDA operates at a fixed 2.1 MHz switching frequency, with a tolerance of ±0.3 MHz across temperature and input voltage. This high-frequency operation allows use of small inductors (typically ≤1.5 µH) and low-ESR ceramic output capacitors (≤22 µF), reducing solution footprint and improving transient response. The frequency is factory-trimmed and not user-adjustable.
Does the LMR33620CDDA require external compensation components?
No, the LMR33620CDDA includes a fully integrated compensation network, eliminating the need for external Type-II or Type-III compensation components. This simplifies design, reduces bill-of-materials count, and improves layout robustness - especially beneficial for high-volume industrial power supply designs where consistency and yield are critical.
What is the minimum input voltage supported by the LMR33620CDDA?
The LMR33620CDDA supports a minimum input voltage of 3.8 V, enabling reliable operation down to near-output voltage levels - for example, regulating 3.3 V output from a 3.8 V input at 2.1 MHz without dropout. This capability is enabled by its 75 ns minimum on-time and peak-current-mode architecture, making it suitable for battery-backed or low-headroom industrial rails.
How does the power-good (PG) flag function on the LMR33620CDDA?
The LMR33620CDDA's PG pin is an open-drain output that asserts high when output voltage is within ±5% of target (105–110% rising, 90–95% falling thresholds) after soft-start completes. It includes a 60–170 µs glitch filter to ignore transient excursions and pulls low during startup, fault conditions, or when EN is deasserted. An external 100 kΩ pull-up to VCC or VOUT is required for proper operation.
Is the LMR33620CDDA qualified for automotive applications?
The LMR33620CDDA itself is not AEC-Q100 qualified; however, a separate AEC-Q100-qualified version (LMR33620CDDAR) is available. The LMR33620CDDA is rated for –40°C to +125°C junction temperature and includes functional safety documentation, making it suitable for industrial applications with automotive-like environmental stress - but not for production automotive ECUs without qualification verification.
LMR33620CDDA 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:
- 2.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LMR33620CDDA FAQ
1.How can I place an order for LMR33620CDDA through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR33620CDDA 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 LMR33620CDDA reliable?
The price and inventory of LMR33620CDDA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR33620CDDA is usually 5 days.
3.What payment methods are accepted for LMR33620CDDA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR33620CDDA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR33620CDDA?
LMR33620CDDA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR33620CDDA 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 LMR33620CDDA?
For technical support, including LMR33620CDDA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR33620CDDA requirements.
6.How does Aetrix verify that LMR33620CDDA is sourced from the original manufacturer or authorized distributors?
All LMR33620CDDA 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 LMR33620CDDA meets industry standards.
7.What is the process for return or replacement of LMR33620CDDA?
All LMR33620CDDA units undergo pre-shipment inspection (PSI). If there is an issue with LMR33620CDDA, 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 LMR33620CDDA part is unused and in its original packaging.
Return procedure for LMR33620CDDA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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