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LM26420XMH/NOPB
Texas Instruments
IC REG BUCK ADJ 2A DL 20HTSSOP
180636 Pcs New Original In Stock
Buck Switching Regulator IC Positive Adjustable 0.8V 2 Output 2A 20-PowerTSSOP (0.173", 4.40mm Width)
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5.0 / 5.0
- (42 Ratings)
LM26420XMH/NOPB
Product Overview
1283038
DiGi Electronics Part Number
LM26420XMH/NOPB-DGManufacturer
Texas Instruments
LM26420XMH/NOPB
Description
IC REG BUCK ADJ 2A DL 20HTSSOPInventory
180636 Pcs New Original In Stock
Buck Switching Regulator IC Positive Adjustable 0.8V 2 Output 2A 20-PowerTSSOP (0.173", 4.40mm Width)
Quantity
Minimum 1
Minimum 1
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LM26420XMH/NOPB Technical Specifications
Category
Power Management (PMIC), Voltage Regulators - DC DC Switching Regulators
Packaging
Tube
Series
-
Product Status
Active
Function
Step-Down
Output Configuration
Positive
Topology
Buck
Output Type
Adjustable
Number of Outputs
2
Voltage - Input (Min)
3V
Voltage - Input (Max)
5.5V
Voltage - Output (Min/Fixed)
0.8V
Voltage - Output (Max)
4.5V
Current - Output
2A
Frequency - Switching
2.2MHz
Synchronous Rectifier
Yes
Operating Temperature
-40°C ~ 125°C (TJ)
Mounting Type
Surface Mount
Package / Case
20-PowerTSSOP (0.173", 4.40mm Width)
Supplier Device Package
20-HTSSOP
Base Product Number
LM26420
Datasheet & Documents
HTML Datasheet
LM26420XMH/NOPB-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
LM26420XMH/NOPB-DG
LM26420XMH
296-LM26420XMH/NOPB
-LM26420XMH-NDR
LM26420XMH-DG
LM26420XMHNOPB
Standard Package
73
Alternative Parts
PART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
Je suis ravi de la compétitivité des prix chez DiGi Electronics, ils proposent des tarifs très avantageux pour la qualité offerte.
de desembre 02, 2025
迅速な発送と丁寧なサポートで、安心してお任せできました。
de desembre 02, 2025
The quality control is impressive, leading to a consistently high standard.
de desembre 02, 2025
I value DiGi’s commitment to supporting customers beyond the initial sale.
de desembre 02, 2025
The support team’s professionalism stood out. They made sure all my concerns were addressed promptly.
de desembre 02, 2025
The quality of their electronic components helps us provide better service to our clients.
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Frequently Asked Questions (FAQ)
Can the LM26420XMH/NOPB safely replace a TPS54320 in a 5V-to-3.3V, 2A industrial control board, and what layout or stability risks should I consider during the swap?
Yes, the LM26420XMH/NOPB can replace the TPS54320 in a 5V-to-3.3V, 2A application, but critical design differences must be addressed. While both are 2A synchronous buck converters with similar input ranges, the LM26420XMH/NOPB operates at a fixed 2.2MHz switching frequency versus the TPS54320’s adjustable 200kHz–2.2MHz range. This higher fixed frequency reduces passive component size but increases sensitivity to PCB layout. Ensure tight loop area for SW, FB, and PGND nodes, and verify output stability with your specific output capacitor ESR—TI’s WEBENCH model for LM26420XMH/NOPB recommends low-ESR ceramics (e.g., X5R/X7R). Also, confirm enable/logic thresholds match your control signal, as the LM26420XMH/NOPB has a higher EN threshold (~1.2V) than the TPS54320 (~0.9V), which may affect low-voltage enable circuits.
What are the thermal derating implications of using the LM26420XMH/NOPB in a sealed enclosure with ambient temperatures up to 85°C, and how does the 20-HTSSOP package affect heat dissipation?
The LM26420XMH/NOPB in the 20-HTSSOP package has a junction-to-ambient thermal resistance (θJA) of approximately 40°C/W, but this degrades significantly in sealed, non-convective environments. At 85°C ambient and full 2A load on both channels (e.g., 5V→1.2V and 5V→3.3V), total power dissipation can exceed 1.8W, pushing junction temperature toward 157°C—beyond the 125°C limit. To mitigate risk, use a grounded copper pour under the exposed thermal pad (pin 21), connect it to system ground with multiple vias, and consider forced airflow or external heatsinking. Derate output current by ~30% per channel above 70°C ambient. Always validate with thermal imaging or thermocouple testing under worst-case load and airflow conditions.
How does the LM26420XMH/NOPB’s 2.2MHz fixed frequency impact EMI compliance in a medical device with sensitive analog front-end circuitry, and what filtering strategies are recommended?
The LM26420XMH/NOPB’s 2.2MHz fixed switching frequency simplifies EMI filtering design compared to variable-frequency regulators, but its high di/dt edges can couple noise into nearby analog circuits (e.g., ECG or EEG front-ends). Harmonic content extends beyond 10MHz, risking interference with sensitive amplifiers. To minimize risk, place the LM26420XMH/NOPB at least 15mm from analog sections, use a π-filter (ferrite bead + 10μF ceramic + 0.1μF) on the input, and add a small RC snubber (10Ω + 100pF) across the SW node. Route feedback traces away from inductors and use a ground plane beneath the IC—but avoid splitting it under the regulator. Conduct pre-compliance radiated emissions testing per IEC 60601-1-2 early in prototyping.
Is it safe to parallel the two outputs of the LM26420XMH/NOPB to deliver more than 2A to a single rail, and what are the risks of current imbalance or oscillation?
No, the two outputs of the LM26420XMH/NOPB should not be paralleled to exceed 2A, even though both channels are internally synchronous buck controllers. TI does not guarantee current sharing accuracy between channels—differences in feedback thresholds, propagation delays, and PCB parasitics can cause one channel to carry significantly more current, leading to localized overheating or premature failure. Additionally, cross-coupling through shared input capacitance or ground paths may induce subharmonic oscillation. For >2A loads, use a dedicated higher-current regulator like the TPS54360 (3.5A) or LM26421 (dual 3A with interleaving). If space-constrained, consider using the LM26420XMH/NOPB for one rail and a separate buck for the high-current path, ensuring independent feedback and layout.
When replacing a failed LM26420XMH/NOPB on a high-volume production board, how can I ensure long-term reliability given its MSL-1 rating and RoHS compliance, and are there known solder joint failure modes in thermal cycling environments?
Although the LM26420XMH/NOPB is MSL-1 (unlimited floor life) and RoHS-compliant, its 20-HTSSOP package with an exposed thermal pad is susceptible to solder joint fatigue under thermal cycling (e.g., -40°C to +85°C daily cycles in automotive or outdoor applications). Inadequate solder paste volume or poor via-in-pad design can lead to cracked joints on the thermal pad, increasing θJA and causing thermal runaway. To ensure reliability, use Type 4 or finer solder paste, apply 50–70% stencil aperture coverage on the thermal pad, and include 6–9 thermal vias (0.3mm drill, filled and capped) connecting to an internal ground plane. Perform thermal cycle testing (-40°C to +125°C, 1000 cycles) on pilot builds and inspect joints via X-ray. Consider underfill for mission-critical applications operating in harsh environments.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
LM26420XMH/NOPB CAD Models
Texas Instruments LM26420XMH/NOPB PCB symbols & footprints
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