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LM5005MHX
Texas Instruments
IC REG BUCK ADJ 2.5A 20HTSSOP
15276 Pcs New Original In Stock
Buck Switching Regulator IC Positive Adjustable 1.225V 1 Output 2.5A 20-PowerTSSOP (0.173", 4.40mm Width)
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5.0 / 5.0
- (207 Ratings)
LM5005MHX
Product Overview
1285225
DiGi Electronics Part Number
LM5005MHX-DGManufacturer
Texas Instruments
LM5005MHX
Description
IC REG BUCK ADJ 2.5A 20HTSSOPInventory
15276 Pcs New Original In Stock
Buck Switching Regulator IC Positive Adjustable 1.225V 1 Output 2.5A 20-PowerTSSOP (0.173", 4.40mm Width)
Quantity
Minimum 1
Minimum 1
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LM5005MHX Technical Specifications
Category
Power Management (PMIC), Voltage Regulators - DC DC Switching Regulators
Packaging
-
Series
-
Product Status
Obsolete
Function
Step-Down
Output Configuration
Positive
Topology
Buck
Output Type
Adjustable
Number of Outputs
1
Voltage - Input (Min)
7V
Voltage - Input (Max)
75V
Voltage - Output (Min/Fixed)
1.225V
Voltage - Output (Max)
70V
Current - Output
2.5A
Frequency - Switching
50kHz ~ 500kHz
Synchronous Rectifier
No
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
LM5005
Datasheet & Documents
HTML Datasheet
LM5005MHX-DG
Environmental & Export Classification
RoHS Status
RoHS non-compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
LM5005MHXTR
LM5005MHXCT
LM5005MHXDKR
Standard Package
2,500
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Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
透明な価格と、その後のサポートがとても良いです。
de desembre 02, 2025
Order processing was fast, and delivery was punctual, showing high operational standards.
de desembre 02, 2025
The strength and quality of their packaging materials are truly commendable.
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Frequently Asked Questions (FAQ)
Can the LM5005MHX be safely used as a drop-in replacement for the LM25011 in a high-voltage industrial power supply design, and what critical layout or compensation adjustments are needed?
The LM5005MHX is not a direct drop-in replacement for the LM25011 due to differences in switching frequency range, feedback architecture, and compensation networks. While both are 75V input buck regulators, the LM5005MHX operates between 50kHz–500kHz with a fixed internal slope compensation scheme, whereas the LM25011 supports higher frequencies and external compensation. Replacing one with the other requires re-evaluation of the feedback loop stability—specifically, the compensation network (RC components at the COMP pin) must be redesigned using TI’s WEBENCH tool for the LM5005MHX. Additionally, ensure PCB layout minimizes high-di/dt loops in the power stage, as the LM5005MHX’s non-synchronous topology increases sensitivity to parasitic inductance. Always validate transient response under worst-case load conditions.
What are the key reliability risks when operating the LM5005MHX near its 75V maximum input voltage in a 48V nominal telecom application with frequent load transients?
Operating the LM5005MHX near its 75V absolute maximum input voltage—especially in 48V systems with surge events (e.g., load dumps or inductive ringing)—poses significant reliability risks. Voltage spikes exceeding 75V can cause immediate gate oxide breakdown in the internal MOSFET. Even brief overshoots due to poor snubber design or long input traces can degrade long-term reliability. To mitigate this, use a TVS diode rated for 70–72V clamping voltage and ensure input capacitance is placed within 5mm of the VIN and GND pins to reduce loop inductance. Also, consider derating the input to ≤70V continuous and validate surge immunity per IEC 61000-4-5. The LM5005MHX’s lack of integrated overvoltage protection makes external clamping essential in harsh environments.
How does the LM5005MHX compare to the newer LM5164 in terms of efficiency and thermal performance for a 24V-to-5V, 2A industrial converter, and is migration recommended despite the LM5005MHX being obsolete?
The LM5164 offers superior efficiency and thermal performance compared to the LM5005MHX in a 24V-to-5V, 2A application due to its integrated synchronous rectification, lower quiescent current, and higher switching frequency capability (up to 1MHz). The LM5005MHX, being non-synchronous, suffers from higher conduction losses in the external diode, especially at low output voltages, leading to greater junction temperature rise under load. In compact designs, this may require additional copper area or airflow. Although the LM5005MHX is obsolete, it may still be used in legacy systems if thermal headroom exists—but for new designs, migrating to the LM5164 reduces BOM complexity, improves efficiency by ~8–12%, and enhances power density. Always re-run thermal simulations when substituting.
What design constraints should be considered when using the LM5005MHX in a compact, high-density PCB where thermal vias under the 20-HTSSOP package are limited by routing density?
The LM5005MHX in a 20-HTSSOP package relies heavily on the exposed thermal pad for heat dissipation, and limiting thermal vias under the package significantly increases junction temperature—especially at 2.5A output or high ambient temperatures. In high-density layouts, avoid routing critical signals through the thermal pad area, but ensure at least 4–6 thermal vias (0.3mm diameter) connect the pad to an internal ground plane. Without adequate vias, RθJA can increase by 30–50%, risking thermal shutdown or reduced MTBF. Use thermal imaging during prototype testing to identify hotspots. If via count is constrained, increase copper pour area on top and bottom layers and consider forced airflow. Never omit the thermal pad connection—it’s essential for reliable operation of the LM5005MHX.
Is it safe to parallel two LM5005MHX regulators to increase output current beyond 2.5A, and what synchronization or current-sharing techniques are required to avoid instability?
Paralleling two LM5005MHX regulators is not recommended due to the lack of current-sharing control, synchronization capability, and precise feedback matching. The LM5005MHX has no master/slave or clock sync feature, and minor differences in feedback thresholds or layout parasitics can cause one device to carry disproportionate load, leading to thermal runaway. Even with identical output voltages set by resistor dividers, dynamic load sharing will be uneven. Instead of paralleling, consider upgrading to a higher-current synchronous buck like the LM5145 (5A) or using a multi-phase controller. If paralleling is unavoidable, add ballast resistors (0.1–0.2Ω, 1W) in series with each output and ensure symmetrical PCB layout—but this reduces efficiency and increases footprint. For mission-critical applications, avoid this configuration entirely with the LM5005MHX.
Quality Assurance (QC)
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LM5005MHX CAD Models
Texas Instruments LM5005MHX PCB symbols & footprints
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