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Texas Instruments LMR33620CDDAR
- Part No.:
- LMR33620CDDAR
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMR33620CDDAR.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:13,014
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Product details
Overview
LMR33620CDDAR from Texas Instruments is a synchronous step-down DC/DC converter delivering 2 A output current across 3.8 V to 36 V input range, with adjustable 1 V–24 V output voltage, 2.1 MHz fixed switching frequency, and peak efficiency >95%. It serves as primary power supply in industrial motor drives, PLC CPU modules, and HVAC control systems.
For engineers reviewing the LMR33620CDDAR datasheet, LMR33620CDDAR pinout, LMR33620CDDAR application, or LMR33620CDDAR equivalent, key selection criteria include its 2.1 MHz operation in HSOIC-8 package, 68 ns minimum on-time, integrated compensation, precision enable threshold (1.231 V typ), and power-good flag with 170 µs glitch filter.
Technical Context
The LMR33620CDDAR implements peak-current-mode control with automatic PFM/PWM mode transition for high light-load efficiency. Its architecture supports dropout regulation down to VIN – VOUT = 150 mV at 1 A and features internal 5-V VCC LDO, boot-strap gate drive, and zero-current detection for diode emulation.
Protection includes cycle-by-cycle current limit (ISC = 3.5 A typ), hiccup-mode short-circuit response (94 ms burst interval), thermal shutdown (165 °C), and input UVLO. The device uses an 8-pin HSOIC package with PowerPAD™ thermal pad and validated pinout for low-EMI layout via symmetrical VIN/PGND routing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8 V to 36 V - supports wide-VIN industrial rails including 12 V, 24 V, and 36 V battery/supply inputs |
| Output Current | 2 A continuous - sufficient for powering microcontrollers, sensors, and gate drivers in compact designs |
| Switching Frequency | 2.1 MHz (C-version, DDA package) - enables use of small external inductors & capacitors, reducing solution size |
| Quiescent Current | 25 µA typical - maintains high efficiency at light loads without sacrificing standby performance |
| Feedback Reference | 1.0 V ±1.5% - provides precise output voltage regulation across temperature and line/load conditions |
| Min On-Time | 75 ns typical (HSOIC) - allows high step-down ratios (e.g., 24 V → 3.3 V) at 2.1 MHz without pulse-skipping |
| Power-Good Flag | Open-drain PG with 170 µs glitch filter - ensures reliable system reset during transient output excursions |
Pinout & Package
LMR33620CDDAR is housed in an 8-pin HSOIC (DDA) package measuring 5.00 mm × 4.00 mm with exposed thermal pad (PowerPAD™) on underside for enhanced thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PGND) | Power Ground | Main return path for high-current switch node; must connect directly to PCB ground plane and bypass capacitor |
| 2 (VIN) | Input Supply | Primary DC input connection; requires low-ESR ceramic capacitor placed adjacent to pin and PGND |
| 3 (EN) | Enable Input | Logic-level control with precision thresholds (1.231 V typ turn-on); connects directly to VIN if always-on operation needed |
| 4 (PG) | Power-Good Flag | Open-drain output indicating regulated output; requires external pull-up resistor (e.g., 100 kΩ to VOUT or VCC) |
| 5 (FB) | Feedback Input | Connects to resistor divider tap; senses output voltage and closes regulation loop with internal 1.0 V reference |
| 6 (VCC) | Internal LDO Output | 5-V internal supply for control circuitry; 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 power inductor; carries high dv/dt switching waveform; 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 complexity |
| HotRod™ Package Architecture | Reduces parasitic inductance by >50% vs standard SOIC, minimizing switch-node ringing and conducted EMI |
| Peak-Current-Mode Control | Provides inherent cycle-by-cycle overcurrent protection and fast transient response without external sensing |
| Automatic PFM/PWM Transition | Maintains >85% efficiency at 1 mA load while delivering full 2 A capability under heavy load |
| Functional Safety Documentation Support | Includes FIT rate, failure mode analysis, and safety manual to accelerate ISO 26262 or IEC 61508 system certification |
Applications
| Motor Drive Systems | Factory Automation |
|---|---|
Use Scenario: Powers flight controller and ESC logic in battery-powered drones operating from 2S–4S LiPo (7.4 V–16.8 V). IC Role / Device Role / Timing Role: Primary 5 V/3.3 V buck regulator supplying MCU, IMU, and radio interface with tight transient response. Use Value: 2.1 MHz switching enables <10 mm² total solution size; 25 µA quiescent current extends flight time during hover/idle states. | Use Scenario: Supplies 3.3 V to PLC CPU module in industrial cabinet with 24 V DC bus and ambient temperatures up to 70 °C. IC Role / Device Role / Timing Role: Main point-of-load regulator converting 24 V to 3.3 V for ARM Cortex-M7 core and peripherals. Use Value: 125 °C junction rating and thermal shutdown ensure reliability; integrated PG flag synchronizes firmware boot sequence. |
| HVAC Control Units | Elevator Control Systems |
Use Scenario: Delivers 5 V to communication interface (RS-485, CAN) and sensor front-end in wall-mounted HVAC thermostat. IC Role / Device Role / Timing Role: Wide-input buck converter handling brownouts and surges on 24 V AC-DC rail. Use Value: 3.8 V minimum input supports operation during low-line events; 1.231 V EN threshold enables precise undervoltage lockout. | Use Scenario: Provides isolated 12 V bias supply for gate drivers in elevator inverter's IGBT stage, fed from 36 V auxiliary rail. IC Role / Device Role / Timing Role: High-reliability step-down regulator supporting functional safety requirements per EN 81-20. Use Value: AEC-Q100-qualified variant available; hiccup-mode short-circuit protection prevents latch-up during IGBT fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR33620BDDAR | 1.4 MHz switching frequency; higher RDS-ON (95–160 mΩ HS) increases conduction loss at 2 A | Better suited for cost-sensitive designs where 2.1 MHz size reduction is unnecessary | Select when board space is less constrained and lower EMI priority permits reduced frequency |
| TPSM53602 | Complete 2 A module with integrated inductor; larger footprint but eliminates external magnetics and layout sensitivity | Targeted at rapid prototyping and low-risk production where design cycle time outweighs solution size | Choose when time-to-market is critical and board area premium is acceptable for guaranteed performance |
Compared with LMR33620BDDAR, the LMR33620CDDAR delivers smaller magnetics and lower EMI via 2.1 MHz operation; compared with TPSM53602, it offers greater design flexibility and lower component cost at the expense of layout effort and validation time.
Availability
LMR33620CDDAR is available at Aetrix Electronics and suitable for motor drive systems, factory automation controllers, and HVAC control units requiring stable component supply, long-term lifecycle support, and automotive-grade reliability.
Supply support for LMR33620CDDAR 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 solutions.
The LMR336xx family was designed specifically for rugged industrial point-of-load conversion, emphasizing wide input range, high efficiency across load, low EMI, and functional safety readiness in compact packages.
FAQ
What is the maximum output voltage supported by the LMR33620CDDAR?
The LMR33620CDDAR supports an adjustable output voltage range from 1 V to 24 V, set via external feedback resistors. The maximum output is limited to 95% of VIN under certain conditions; for outputs above 24 V or near VIN, consult TI's application engineering team. The internal 1.0 V reference and precision FB pin enable ±1.5% regulation accuracy across temperature and load.
Does the LMR33620CDDAR require external compensation components?
No, the LMR33620CDDAR integrates a complete compensation network, eliminating the need for external Type-II or Type-III compensation components. This reduces bill-of-materials count, simplifies PCB layout, and accelerates design validation. The internal compensation is optimized for stability with standard 22 µF–47 µF output capacitors and typical 1–2.2 µH inductors used in 2.1 MHz operation.
What package type and thermal characteristics does the LMR33620CDDAR use?
The LMR33620CDDAR uses an 8-pin HSOIC (DDA) package with PowerPAD™ thermal pad (5.00 mm × 4.00 mm). Its junction-to-ambient thermal resistance (RθJA) is 42.9 °C/W on a 4-layer JEDEC board. For production designs, thermal performance depends on PCB copper area under the exposed pad; TI recommends ≥250 mm² of 2-oz copper connected via ≥6 thermal vias to inner ground planes.
How does the power-good (PG) flag behave during startup and fault conditions for the LMR33620CDDAR?
The LMR33620CDDAR PG flag is an open-drain output that remains low for ~4 ms after EN assertion, then goes high when VOUT reaches 95% of target. It pulls low during overcurrent, thermal shutdown, or EN deactivation. A 170 µs internal glitch filter prevents false triggering during transients. When unused, PG must be left floating - no pull-up or tie-down is required.
Can the LMR33620CDDAR operate in dropout mode, and what is its minimum dropout voltage?
Yes, the LMR33620CDDAR operates in dropout mode with automatic frequency foldback. At 1 A output and 5 V setting, its measured dropout voltage (VIN – VOUT) is 150 mV. This enables stable regulation even when input sags close to output voltage - critical for 12 V or 24 V systems experiencing brownouts. Minimum on-time (75 ns typ) and adaptive duty cycle allow this behavior without external intervention.
LMR33620CDDAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- 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):
- 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
LMR33620CDDAR FAQ
1.How can I place an order for LMR33620CDDAR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR33620CDDAR 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 LMR33620CDDAR reliable?
The price and inventory of LMR33620CDDAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR33620CDDAR is usually 5 days.
3.What payment methods are accepted for LMR33620CDDAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR33620CDDAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR33620CDDAR?
LMR33620CDDAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR33620CDDAR 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 LMR33620CDDAR?
For technical support, including LMR33620CDDAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR33620CDDAR requirements.
6.How does Aetrix verify that LMR33620CDDAR is sourced from the original manufacturer or authorized distributors?
All LMR33620CDDAR 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 LMR33620CDDAR meets industry standards.
7.What is the process for return or replacement of LMR33620CDDAR?
All LMR33620CDDAR units undergo pre-shipment inspection (PSI). If there is an issue with LMR33620CDDAR, 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 LMR33620CDDAR part is unused and in its original packaging.
Return procedure for LMR33620CDDAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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