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LMR33620BDDAR
Texas Instruments
IC REG BUCK ADJ 2A 8SOPWR
30358 Pcs New Original In Stock
Buck Switching Regulator IC Positive Adjustable 1V 1 Output 2A 8-PowerSOIC (0.154", 3.90mm Width)
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LMR33620BDDAR
Product Overview
1385134
DiGi Electronics Part Number
LMR33620BDDAR-DGManufacturer
Texas Instruments
LMR33620BDDAR
Description
IC REG BUCK ADJ 2A 8SOPWRInventory
30358 Pcs New Original In Stock
Buck Switching Regulator IC Positive Adjustable 1V 1 Output 2A 8-PowerSOIC (0.154", 3.90mm Width)
Quantity
Minimum 1
Minimum 1
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LMR33620BDDAR Technical Specifications
Category
Power Management (PMIC), Voltage Regulators - DC DC Switching Regulators
Packaging
Cut Tape (CT) & Digi-Reel®
Series
SIMPLE SWITCHER®
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)
Mounting Type
Surface Mount
Package / Case
8-PowerSOIC (0.154", 3.90mm Width)
Supplier Device Package
8-SO PowerPad
Base Product Number
LMR33620
Datasheet & Documents
Manufacturer Product Page
LMR33620BDDAR Specifications
HTML Datasheet
LMR33620BDDAR-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
2 (1 Year)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
296-51356-1
296-51356-2
LMR33620BDDAR-DG
296-51356-6
Standard Package
2,500
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
DiGi makes it easy to choose eco-friendly products that are also budget-friendly.
de desembre 02, 2025
DiGi Electronics' products perform reliably under harsh conditions, which is critical for our industry.
de desembre 02, 2025
Their pricing strategy makes high-quality electronics accessible to everyone.
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Frequently Asked Questions (FAQ)
What are the key design-in risks when using the LMR33620BDDAR in a high-temperature industrial application, and how can thermal performance be optimized on a standard PCB?
When designing in the LMR33620BDDAR for high-temperature environments up to 125°C junction temperature, inadequate PCB copper area for thermal dissipation is a common risk. The 8-SO PowerPad package relies heavily on proper thermal vias and copper planes to transfer heat from the exposed pad to inner or bottom layers. To optimize thermal performance, use at least a 4-layer PCB with 1-inch² of thermal copper connected via 4–6 evenly spaced thermal vias under the pad. Ensure the solder profile achieves full thermal pad reflow to prevent voids, which degrade heat transfer. Without this, derating below 2A output current may be necessary in enclosed or convection-only systems.
How does the LMR33620BDDAR compare to the LM2678-5.0 in a 5V, 1.5A power rail redesign, especially regarding EMI and board space?
Replacing the LM2678-5.0 with the LMR33620BDDAR in a 5V, 1.5A application offers significant advantages in size and EMI. The LMR33620BDDAR operates at 1.4MHz (vs. 500kHz for LM2678), enabling smaller inductors and capacitors, reducing board footprint by ~40%. Its higher switching frequency moves noise above AM band, easing EMI compliance when combined with proper input LC filtering. However, unlike the fixed-output LM2678, the LMR33620BDDAR requires external feedback resistors for 5V setup, introducing potential divider inaccuracies. Use 1% tolerance resistors and layout them close to the FB pin to minimize noise pickup. The synchronous rectification in the LMR33620BDDAR also improves efficiency, especially under light loads.
Can the LMR33620BDDAR reliably regulate down to 1V at full 2A load, and what factors could cause output voltage droop?
Yes, the LMR33620BDDAR is specified to regulate down to 1V at up to 2A output, but output droop risk increases due to voltage divider loading and PCB trace resistance. At 1V, the feedback voltage is referenced to 1V internal, so resistor values must be low enough to avoid current starvation of the FB pin—typically use 1.8kΩ and 2.7kΩ for 1V. However, high-resistance dividers are sensitive to leakage. Also, trace resistance from VOUT to the load creates a voltage drop under 2A. To ensure accuracy, use Kelvin sensing by routing the FB pin directly to the load point (remote sensing) and minimize high-current path impedance with wide PCB traces or pours.
What are the stability risks when replacing the LMR33620BDDAR with the LM5164 in a 24V input, 12V/2A buck design, and how do control architectures differ?
Swapping the LMR3620BDDAR with the LM5164 introduces design risks due to fundamental control architecture differences. The LMR33620BDDAR uses voltage-mode control with internal compensation, simplifying design with fewer external components. The LM5164 is a current-mode controller requiring external compensation and slope compensation, increasing design complexity. If not properly compensated, the LM5164 can suffer from subharmonic oscillation or loop instability. Additionally, the LMR33620BDDAR’s fixed 1.4MHz frequency simplifies EMI filtering, while the LM5164’s adjustable frequency requires careful attention to noise spectra. Replace only with full loop analysis and layout adjustments for high dI/dt sensing traces.
Is the LMR33620BDDAR suitable for automotive PSRR-sensitive loads like ADC references, and how can input noise coupling be minimized at 1.4MHz?
The LMR33620BDDAR can power PSRR-sensitive analog loads like ADC references in automotive systems, but input noise at 1.4MHz switching frequency must be mitigated. While the regulator itself has good inherent noise rejection, high dv/dt at the input node couples through parasitic capacitance. To reduce noise, place a low-ESR ceramic capacitor (e.g., 10µF X7R 50V) as close as possible to the VIN pin, followed by a small ferrite bead and additional 1µF ceramic to form an LC filter. Avoid routing sensitive analog traces under or near the LMR33620BDDAR’s SW node. Additionally, ensure the ground plane is uninterrupted beneath the IC to minimize return path inductance, reducing conducted emissions into sensitive circuitry.
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LMR33620BDDAR CAD Models
Texas Instruments LMR33620BDDAR PCB symbols & footprints
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