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LM2647MTC
Texas Instruments
IC REG CTRLR BUCK 28TSSOP
66147 Pcs New Original In Stock
Buck Regulator Positive Output Step-Down DC-DC Controller IC 28-TSSOP
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5.0 / 5.0
- (395 Ratings)
LM2647MTC
Product Overview
1358741
DiGi Electronics Part Number
LM2647MTC-DGManufacturer
Texas Instruments
LM2647MTC
Description
IC REG CTRLR BUCK 28TSSOPInventory
66147 Pcs New Original In Stock
Buck Regulator Positive Output Step-Down DC-DC Controller IC 28-TSSOP
Quantity
Minimum 1
Minimum 1
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LM2647MTC Technical Specifications
Category
Power Management (PMIC), DC DC Switching Controllers
Packaging
-
Series
-
Product Status
Obsolete
Output Type
Transistor Driver
Function
Step-Down
Output Configuration
Positive
Topology
Buck
Number of Outputs
2
Output Phases
2
Voltage - Supply (Vcc/Vdd)
5.5V ~ 28V
Frequency - Switching
200kHz ~ 500kHz
Duty Cycle (Max)
75%
Synchronous Rectifier
Yes
Clock Sync
No
Serial Interfaces
-
Control Features
Current Limit, Enable, Frequency Control, Power Good, Soft Start
Operating Temperature
-5°C ~ 125°C (TJ)
Mounting Type
Surface Mount
Package / Case
28-TSSOP (0.173", 4.40mm Width)
Supplier Device Package
28-TSSOP
Base Product Number
LM2647
Datasheet & Documents
HTML Datasheet
LM2647MTC-DG
Environmental & Export Classification
RoHS Status
RoHS non-compliant
Moisture Sensitivity Level (MSL)
3 (168 Hours)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Standard Package
48
Alternative Parts
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SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
грудня 02, 2025
Tolle Preisgestaltung und schnelle Unterstützung nach dem Kauf – ich bin rundum zufrieden.
грудня 02, 2025
Their products are consistently uniform, reflecting meticulous quality standards.
грудня 02, 2025
I appreciate their promptness in shipping, and the products feel sturdy enough to withstand rough handling.
грудня 02, 2025
I’ve never had to wait long; their shipping is both fast and reliable.
грудня 02, 2025
Their promotional prices are unbeatable, yet they never compromise on packaging durability.
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Frequently Asked Questions (FAQ)
What are the key design risks when replacing the obsolete LM2647MTC in a dual-output buck converter system, and how can I ensure compatibility with modern alternatives?
The LM2647MTC is obsolete and RoHS non-compliant, posing supply chain and regulatory risks. When selecting a replacement, pay close attention to control features like current limit, soft-start, and power-good signaling—features critical for stability in dual-phase designs. A suitable drop-in alternative is the LM2647MTC/NOPB (the RoHS-compliant version), but if unavailable, consider the TPS51363 or TPS40322 from Texas Instruments, which offer similar 2-phase buck control with enhanced efficiency and thermal performance. Verify pin compatibility, feedback loop dynamics, and enable logic thresholds before redesigning the PCB, as subtle differences in timing or drive strength can affect transient response and EMI behavior.
How does the lack of clock synchronization in the LM2647MTC impact EMI performance in multi-rail power systems, and what layout strategies can mitigate this risk?
Since the LM2647MTC lacks clock synchronization (no SYNC pin), its two internal oscillators may beat against each other or against other switching regulators in the system, creating low-frequency ripple and complicating EMI filtering. This is especially problematic in noise-sensitive applications like RF or precision analog circuits. To mitigate this, tightly couple the switching nodes with proper ground planes, use shielded inductors, and stagger the startup timing of adjacent regulators via their enable pins. Additionally, placing input and output capacitors as close as possible to the IC reduces loop area and minimizes radiated emissions—critical when operating near the 200–500 kHz switching range.
Can the LM2647MTC safely drive high-side N-channel MOSFETs in a 24V industrial input application, given its 28V Vcc max and 75% max duty cycle?
Yes, but with caution. The LM2647MTC’s 28V absolute maximum Vcc rating leaves minimal margin for 24V nominal industrial systems that can experience voltage surges up to 30V during load dumps or transients. Although the 75% max duty cycle supports step-down conversion from 24V to typical outputs like 5V or 3.3V, you must include input transient voltage suppression (e.g., TVS diodes) and ensure the bootstrap circuitry for high-side gate drive is properly designed to avoid overvoltage on the SW node. Also, verify that the selected MOSFETs have sufficient Vgs tolerance, as the controller’s gate drive voltage is derived from Vcc and may not fully enhance logic-level FETs under low-line conditions.
What reliability concerns should I consider when using the LM2647MTC in automotive or extended-temperature environments, despite its -5°C to 125°C operating range?
While the LM2647MTC supports junction temperatures up to 125°C, its MSL 3 rating (168 hours floor life) and RoHS non-compliance raise reliability flags in harsh environments. In automotive applications, thermal cycling and humidity can accelerate failure if moisture ingress occurs during assembly—especially problematic given the 28-TSSOP package’s susceptibility to popcorning. Additionally, the absence of AEC-Q100 qualification means it’s not recommended for under-hood use. If deployment in elevated temperatures is unavoidable, implement strict bake-and-mount protocols, conformal coating, and derate output current by at least 20% to reduce thermal stress on the controller and external MOSFETs.
How do I configure the soft-start and current limit features on the LM2647MTC to prevent inrush current issues when powering capacitive loads exceeding 1000µF?
The LM2647MTC includes programmable soft-start and current limit features essential for managing inrush into large output capacitors. To safely handle >1000µF loads, connect a capacitor from the SS pin to ground to set the soft-start time—typically 1–10µF for 10–100ms ramp-up, reducing peak input current. Simultaneously, adjust the current sense resistors on each phase to set foldback-style current limiting, ensuring the total input surge stays within your power supply’s capability. Be aware that aggressive soft-start settings may interact with the power-good threshold; validate timing using an oscilloscope during startup to avoid false fault triggering, especially in systems with sequenced power rails.
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.
LM2647MTC CAD Models
Texas Instruments LM2647MTC PCB symbols & footprints
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