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Texas Instruments UC2577TDKTTT-ADJG3
- Part No.:
- UC2577TDKTTT-ADJG3
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
UC2577TDKTTT-ADJG3.pdf
- Description:
- IC REG BST FLYBACK ADJ 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:4,149
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Product details
Overview
UC2577TDKTTT-ADJG3 from Texas Instruments is a current-mode step-up (boost) DC-DC switching regulator IC featuring an integrated 3.0A/65V NPN power switch, 52kHz fixed-frequency oscillator, adjustable output voltage via external resistor divider, soft-start function, and protection circuitry including undervoltage lockout, thermal shutdown, and current limiting. It operates from 3.0V to 40V input and supports up to 60V output in boost topology.
For engineers reviewing the UC2577TDKTTT-ADJG3 datasheet, UC2577TDKTTT-ADJG3 pinout, UC2577TDKTTT-ADJG3 application, or UC2577TDKTTT-ADJG3 equivalent, key selection considerations include its TO-263 (DDPAK) 5-pin package, internal NPN switch rating, 1.23V reference voltage tolerance, current-mode control for transient response, and compatibility with standard boost/flyback/SEPIC designs requiring stable 52kHz operation and adjustable regulation.
Technical Context
The UC2577TDKTTT-ADJG3 implements current-mode PWM control using an internal 1.23V precision reference and error amplifier to regulate output voltage by modulating peak inductor current. Its fixed 52kHz oscillator drives the NPN switch with duty cycle up to 95%, enabling efficient energy transfer in boost, flyback, and SEPIC topologies.
Protection functions are tightly integrated: undervoltage lockout triggers below 2.85V (typ), thermal shutdown activates at 150°C junction temperature, and current limiting responds to sensed switch current with a typical 3.0A threshold. Soft-start is implemented via controlled charging of the COMP pin using a 2.5–7.5µA (typ) internal current source.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 40V - supports wide-range industrial and automotive inputs without pre-regulation. |
| Output Switch Rating | 3.0A continuous, 65V max - enables robust boost conversion up to 60V output with margin. |
| Oscillator Frequency | 52kHz (typ) - fixed frequency simplifies EMI filtering and inductor selection; no external timing components required. |
| Reference Voltage | 1.230V ±24mV (25°C) - sets output voltage accuracy via R1/R2 feedback divider; determines regulation tightness. |
| Current Limit Threshold | 3.0A (typ) - protects internal NPN switch during overload or short-circuit conditions. |
| Soft-Start Current | 2.5–7.5µA (typ) - controls ramp rate of COMP pin voltage to limit inrush current during startup. |
| Thermal Shutdown | 150°C junction temperature - prevents permanent damage under sustained overloads or poor heatsinking. |
| UVLO Threshold | 2.85V (typ) - ensures reliable start-up only when input supply meets minimum operating requirement. |
Pinout & Package
UC2577TDKTTT-ADJG3 is housed in a surface-mount DDPAK/TO-263 (KTT) 5-pin package with exposed thermal pad for enhanced power dissipation. The package measures 10.6mm × 15.6mm × 4.9mm (A0 × B0 × K0) and is RoHS-compliant with green (Pb-free, Sb/Br-free) finish and JEDEC MSL Level-2 moisture sensitivity rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Supply | Primary DC input connection (3.0V–40V); must be bypassed with low-ESR capacitor near pin. |
| GND | Power Ground | Common return path for input, output, and internal circuitry; connects to thermal pad for heat sinking. |
| SWITCH | NPN Collector Output | Drives external inductor; switches at 52kHz; voltage swings up to 65V relative to GND. |
| FB | Feedback Input | Monitors divided output voltage; compares to 1.23V reference to regulate output; high-impedance node. |
| COMP | Error Amplifier Output | Provides compensation network interface; sets loop stability and soft-start timing via RC/CC network. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3.0A NPN Power Switch | Eliminates need for external high-current transistor; reduces BOM count and layout complexity in boost/flyback designs. |
| Current-Mode Control Architecture | Improves line/load regulation, enhances transient response, and enables inherent cycle-by-cycle current limiting. |
| 52kHz Fixed-Frequency Oscillator | Enables predictable EMI profile and simplifies filter design; no external timing components required. |
| Adjustable Output Voltage | Set via external R1/R2 divider referenced to 1.23V internal reference - supports custom output voltages from ~1.25V to 60V. |
| Soft-Start Function | Reduces input inrush current by gradually increasing duty cycle via controlled COMP pin charging - prevents supply sag and stress on input capacitors. |
| Comprehensive Protection Suite | Includes UVLO, thermal shutdown, and current limiting - ensures safe operation under fault conditions without external supervision. |
Applications
| Industrial Power Supplies | Automotive Lighting Systems |
|---|---|
Use Scenario: Generating 24V or 48V rail from 12V battery in factory automation controllers or PLC I/O modules. IC Role / Device Role / Timing Role: Primary step-up regulator controlling energy transfer via 52kHz PWM to drive isolated or non-isolated DC bus. Use Value: Enables compact, efficient single-stage conversion with built-in current limiting and thermal protection for unattended operation. | Use Scenario: Powering LED headlamps or interior lighting from vehicle 12V system where output must exceed input voltage. IC Role / Device Role / Timing Role: Boost controller regulating constant current through external MOSFET driver stage; 52kHz switching avoids audible noise. Use Value: Delivers stable, dimmable output with soft-start preventing bulb inrush stress and UVLO ensuring reliable cold-cranking operation. |
| Telecom Remote Power Feeds | Portable Test Equipment |
Use Scenario: Providing +48V bias for remote analog front-ends or PoE-powered peripherals from local 5V/12V sources. IC Role / Device Role / Timing Role: Flyback or SEPIC converter core managing isolation and voltage step-up; COMP pin used for loop compensation. Use Value: Supports input > output or input < output configurations with single IC; current-mode control maintains regulation across wide load transients. | Use Scenario: Generating programmable auxiliary rails (e.g., ±15V, +24V) in handheld multimeters or signal generators powered by Li-ion batteries. IC Role / Device Role / Timing Role: Adjustable boost regulator supplying precision analog circuitry; FB pin enables accurate voltage setting via microcontroller-controlled DAC/resistor network. Use Value: Achieves <±1% output accuracy over temperature and load with minimal external parts - critical for measurement integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2577-ADJ | Legacy TI part; same pinout and functional architecture but lower current capability (3A vs. 3A typ), wider ref tolerance (1.23V ±5%), and no soft-start current spec. | Same boost/flyback use cases; less precise regulation and slower startup may affect sensitive loads. | Choose UC2577TDKTTT-ADJG3 for tighter reference, guaranteed soft-start, and improved thermal performance in new designs. |
| TPS61088RHLR | Modern synchronous boost IC; 10A switch, 2.7V–12V input, 4.5V–20V output, 500kHz–2MHz programmable frequency, no external diode needed. | Better efficiency and higher power density, but incompatible pinout, narrower input range, and requires different compensation design. | Choose UC2577TDKTTT-ADJG3 when legacy compatibility, 40V input support, or cost-sensitive discrete-diode designs are required. |
Compared with LM2577-ADJ, UC2577TDKTTT-ADJG3 offers tighter reference voltage and defined soft-start behavior; compared with TPS61088RHLR, it provides wider input range and simpler external component requirements at the expense of switching frequency flexibility and synchronous rectification.
Availability
UC2577TDKTTT-ADJG3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive lighting systems, telecom remote power feeds, and portable test equipment requiring stable component supply with long-term manufacturability and RoHS compliance.
Supply support for UC2577TDKTTT-ADJG3 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in power conversion ICs.
The UC2577 series was designed as a robust, cost-effective upgrade to the LM2577 family for non-synchronous boost, flyback, and SEPIC converters targeting industrial, automotive, and telecom applications demanding reliability and wide input range.
FAQ
What is the maximum output voltage achievable with UC2577TDKTTT-ADJG3 in boost configuration?
The UC2577TDKTTT-ADJG3 supports up to 60V output in standard boost topology, as specified in the recommended operating range. This limit arises from the 65V maximum switch voltage rating and internal protection thresholds. Exceeding 60V risks violating absolute maximum ratings and compromising reliability, even if external components are rated higher. For outputs above 60V, flyback or forward converter topologies are recommended per the device's intended use cases.
Does UC2577TDKTTT-ADJG3 require an external diode, and what type is recommended?
Yes, UC2577TDKTTT-ADJG3 requires an external Schottky or fast-recovery diode in boost configuration to complete the current path during switch-off periods. Recommended types include MBR140P (40V, 1A) or MBR340P (40V, 3A) for ≤40V outputs, or 1N5822 (40V) and 1N5823 (50V) for general-purpose use. Diode reverse voltage rating must exceed the output voltage, and average/peak current ratings must exceed calculated load and ripple currents per the datasheet's design equations.
How is output voltage adjusted on UC2577TDKTTT-ADJG3?
Output voltage on UC2577TDKTTT-ADJG3 is adjusted using a resistive divider (R1 and R2) connected between VOUT, FB, and GND. The FB pin senses a fraction of the output and compares it to the internal 1.23V reference. The relationship is R1/R2 = (VOUT / 1.23V) − 1. For example, to set 12V output, R1 ≈ 48.7kΩ and R2 ≈ 5.62kΩ (1% tolerance) yields VOUT ≈ 12.0V. Layout best practices require short, low-impedance traces to FB and proper grounding of the divider.
What thermal management considerations apply to UC2577TDKTTT-ADJG3 in TO-263 package?
The UC2577TDKTTT-ADJG3 in TO-263 (KTT) package features an exposed thermal pad that must be soldered to a large copper pour on the PCB for effective heat dissipation. Thermal resistance junction-to-ambient is 65°C/W; achieving lower values requires ≥2 in² of 2-oz copper connected to the pad with multiple thermal vias. Junction temperature must remain ≤150°C under worst-case load and ambient conditions - derating is necessary above 70°C ambient or at full 3A load without forced airflow.
Is UC2577TDKTTT-ADJG3 pin-compatible with other UC2577 variants?
Yes, UC2577TDKTTT-ADJG3 shares identical pinout and electrical functionality with all UC2577-ADJ variants in the same package type, including UC2577TDKTTT-ADJ and UC2577TDTR-ADJ (both TO-263/KTT). Differences are limited to packaging format (reel vs. tube), RoHS compliance level (G3 suffix denotes green finish), and MSL rating - all maintain identical pin assignments, thermal pad layout, and electrical behavior. No PCB redesign is needed when substituting within the same package family.
UC2577TDKTTT-ADJG3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, Flyback, Forward Converter
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- 60V
- Current - Output:
- 3A (Switch)
- Frequency - Switching:
- 52kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-5)
UC2577TDKTTT-ADJG3 FAQ
1.How can I place an order for UC2577TDKTTT-ADJG3 through Aetrix?
Please submit a Request for Quotation (RFQ) for UC2577TDKTTT-ADJG3 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for UC2577TDKTTT-ADJG3 reliable?
The price and inventory of UC2577TDKTTT-ADJG3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC2577TDKTTT-ADJG3 is usually 5 days.
3.What payment methods are accepted for UC2577TDKTTT-ADJG3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC2577TDKTTT-ADJG3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC2577TDKTTT-ADJG3?
UC2577TDKTTT-ADJG3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC2577TDKTTT-ADJG3 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for UC2577TDKTTT-ADJG3?
For technical support, including UC2577TDKTTT-ADJG3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC2577TDKTTT-ADJG3 requirements.
6.How does Aetrix verify that UC2577TDKTTT-ADJG3 is sourced from the original manufacturer or authorized distributors?
All UC2577TDKTTT-ADJG3 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that UC2577TDKTTT-ADJG3 meets industry standards.
7.What is the process for return or replacement of UC2577TDKTTT-ADJG3?
All UC2577TDKTTT-ADJG3 units undergo pre-shipment inspection (PSI). If there is an issue with UC2577TDKTTT-ADJG3, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The UC2577TDKTTT-ADJG3 part is unused and in its original packaging.
Return procedure for UC2577TDKTTT-ADJG3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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