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LM2577SX-ADJ/NOPB
Texas Instruments
IC REG MULT CONFIG ADJ 3A DDPAK
37208 Pcs New Original In Stock
Boost, Flyback, Forward Converter Switching Regulator IC Positive or Negative Adjustable 1.23V 1 Output 3A (Switch) TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
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5.0 / 5.0
- (396 Ratings)
LM2577SX-ADJ/NOPB
Product Overview
1468369
DiGi Electronics Part Number
LM2577SX-ADJ/NOPB-DGManufacturer
Texas Instruments
LM2577SX-ADJ/NOPB
Description
IC REG MULT CONFIG ADJ 3A DDPAKInventory
37208 Pcs New Original In Stock
Boost, Flyback, Forward Converter Switching Regulator IC Positive or Negative Adjustable 1.23V 1 Output 3A (Switch) TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
Quantity
Minimum 1
Minimum 1
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LM2577SX-ADJ/NOPB 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-Up, Step-Up/Step-Down
Output Configuration
Positive or Negative
Topology
Boost, Flyback, Forward Converter
Output Type
Adjustable
Number of Outputs
1
Voltage - Input (Min)
3.5V
Voltage - Input (Max)
40V
Voltage - Output (Min/Fixed)
1.23V
Voltage - Output (Max)
60V (Switch)
Current - Output
3A (Switch)
Frequency - Switching
52kHz
Synchronous Rectifier
No
Operating Temperature
-40°C ~ 125°C (TJ)
Mounting Type
Surface Mount
Package / Case
TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
Supplier Device Package
TO-263 (DDPAK-5)
Base Product Number
LM2577
Datasheet & Documents
Manufacturer Product Page
LM2577SX-ADJ/NOPB Specifications
HTML Datasheet
LM2577SX-ADJ/NOPB-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
3 (168 Hours)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
*LM2577SX-ADJ/NOPB
LM2577SX-ADJ/NOPBDKR
LM2577SX-ADJ/NOPBCT
LM2577SX-ADJ/NOPBTR
LM2577SX-ADJ-NDR
LM2577SXADJNOPB
Standard Package
500
Alternative Parts
PART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
이 가격에 이만한 품질과 서비스는 또 없다고 생각합니다.
Dec 02, 2025
La rapidité de leur traitement de commande contribue à la fluidité de nos activités éducatives.
Dec 02, 2025
Their proactive approach in after-sales service makes a significant difference in our operations.
Dec 02, 2025
Quick delivery and eco-packaging made the process smooth and guilt-free.
Dec 02, 2025
Their support team was patient when I needed help understanding product features after receiving my order.
Dec 02, 2025
Fast shipping and reliable support are their strengths, without a doubt.
Dec 02, 2025
Their packaging is robust and thoughtfully designed, ensuring products arrive in perfect condition.
Dec 02, 2025
Their dispatch process is efficient, ensuring timely arrival every time.
Dec 02, 2025
Their dedication to after-sales service ensures peace of mind for customers.
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Frequently Asked Questions (FAQ)
Can the LM2577SX-ADJ/NOPB be used to replace a failed LT1377 in a 12V to 24V boost converter design, and what layout or compensation changes are needed?
The LM2577SX-ADJ/NOPB is not a direct drop-in replacement for the LT1377 due to differences in switching frequency (52kHz vs. 500kHz), feedback architecture, and current handling. While both are boost-capable switching regulators, the LM2577SX-ADJ/NOPB requires a larger output inductor and input/output capacitors due to its lower switching frequency, which increases ripple and physical size. Additionally, the compensation network must be redesigned—the LT1377 uses a transconductance error amplifier, whereas the LM2577SX-ADJ/NOPB uses a voltage-mode control scheme. You’ll need to recalculate the feedback resistor divider and ensure stability with appropriate phase margin. Always validate transient response and efficiency under full load before finalizing the redesign.
What are the critical thermal design risks when using the LM2577SX-ADJ/NOPB in a sealed enclosure with ambient temperatures up to 60°C, and how can they be mitigated?
In a sealed enclosure at 60°C ambient, the LM2577SX-ADJ/NOPB’s junction temperature can easily exceed safe limits due to its non-synchronous topology and high switching losses at elevated loads. With a thermal resistance (θJA) of ~40°C/W on a standard PCB, even 2W of dissipation can push TJ beyond 140°C—close to the 150°C absolute max. To mitigate this, use a large thermal pad connected to an internal ground plane, add vias under the tab for heat spreading, and consider a small heatsink or metal chassis coupling. Reduce duty cycle stress by minimizing input-output voltage differential where possible, and derate output current by at least 30% under these conditions to ensure long-term reliability.
Is the LM2577SX-ADJ/NOPB suitable for generating a stable -15V rail from a +5V input in a flyback configuration, and what snubber design considerations apply?
Yes, the LM2577SX-ADJ/NOPB can generate -15V from +5V in a flyback topology by configuring it for negative output with a coupled inductor. However, leakage inductance in the transformer can cause high voltage spikes on the switch node, risking device breakdown. A properly designed RCD snubber across the primary winding is essential—start with a 1kΩ resistor and 1nF capacitor, then tune empirically to minimize ringing without excessive power loss. Also ensure the feedback network references the negative output correctly using an optocoupler or differential sensing if isolation is required. Pay close attention to PCB creepage and clearance distances due to the 60V switch node capability being stressed near its limit in this configuration.
How does the LM2577SX-ADJ/NOPB compare to the MC34063A for a low-cost 3.7V Li-ion to 12V/1A boost application, and why might the TI part be worth the higher cost?
While the MC34063A is cheaper and widely available, the LM2577SX-ADJ/NOPB offers significantly better efficiency (up to 85% vs. ~70%), higher switch current (3A vs. 1.5A), and integrated protection features like thermal shutdown and current limiting. For a 3.7V to 12V/1A boost, the MC34063A requires an external catch diode and Darlington switch, increasing component count and board space, whereas the LM2577SX-ADJ/NOPB integrates the switch and simplifies layout. The TI device also operates at a fixed 52kHz, reducing EMI design complexity compared to the MC34063A’s variable frequency under load. If thermal performance, reliability, and BOM consolidation matter—especially in industrial or automotive-adjacent applications—the LM2577SX-ADJ/NOPB justifies its premium.
What reliability concerns arise when operating the LM2577SX-ADJ/NOPB near its 40V input maximum in an industrial environment with frequent load dumps or voltage transients?
Operating the LM2577SX-ADJ/NOPB near 40V input in industrial settings exposes it to risk from inductive load dumps, motor back-EMF, or supply surges that can exceed the absolute maximum rating. Even brief transients above 40V may degrade the internal MOSFET or cause latent failures. To enhance reliability, add a TVS diode (e.g., SMAJ33A) at the input rated for 33V clamping, along with a bulk electrolytic capacitor (≥100µF) and a fast ceramic decoupling cap. Consider a series input resistor or PTC fuse for inrush protection. If the system experiences regular >36V spikes, evaluate stepping down via a pre-regulator or switching to a higher-voltage alternative like the LM5008. Always perform surge testing per IEC 61000-4-5 to validate robustness.
Quality Assurance (QC)
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LM2577SX-ADJ/NOPB CAD Models
Texas Instruments LM2577SX-ADJ/NOPB PCB symbols & footprints
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