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Texas Instruments UC2577TDTR-ADJG3
- Part No.:
- UC2577TDTR-ADJG3
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
UC2577TDTR-ADJG3.pdf
- Description:
- IC REG BST FLYBACK ADJ 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:3,993
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Product details
Overview
UC2577TDTR-ADJG3 from Texas Instruments is a monolithic step-up (boost) DC-DC switching regulator IC featuring an integrated 3.0A, 65V NPN power switch, adjustable output voltage, 52kHz fixed-frequency current-mode control, and soft-start functionality. It operates from 3.0V to 40V input and delivers up to 60V output in boost topology-used in industrial power supplies, battery-powered instrumentation, and distributed power architectures requiring compact, high-voltage conversion.
For engineers reviewing the UC2577TDTR-ADJG3 datasheet, UC2577TDTR-ADJG3 pinout, UC2577TDTR-ADJG3 application, or UC2577TDTR-ADJG3 equivalent, key selection considerations include its 3.0A internal NPN switch rating, 1.23V precision reference voltage, thermal shutdown protection, undervoltage lockout at 2.85V (typ), and compatibility with standard TO-263 (DDPAK) layout practices for high-current switching regulators.
Technical Context
The UC2577TDTR-ADJG3 implements current-mode control using an internal 52kHz oscillator and comparator that terminates switch conduction when sensed inductor current matches the error amplifier's output voltage. Its NPN output stage operates in fixed-frequency discontinuous or continuous conduction mode depending on load and inductance, enabling stable regulation across wide line and load variations.
Feedback is taken via a resistor divider to the FB pin referenced to a 1.23V (±2.4%) internal bandgap reference; compensation is applied at the COMP pin using an RC network to stabilize loop response. Protection includes cycle-by-cycle current limiting, thermal shutdown at 150°C, and UVLO activation below 2.85V (typ), ensuring robust operation under fault conditions without external supervision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 40V - supports wide-input industrial and battery-derived supplies including 12V/24V rails and multi-cell Li-ion stacks. |
| Output Switch Rating | 3.0A, 65V max - enables boost conversion up to 60V output with margin; requires external diode and inductor for full implementation. |
| Oscillator Frequency | 52kHz (typ) - fixed frequency simplifies EMI filtering and allows use of low-cost, high-saturation inductors optimized for <100kHz operation. |
| Reference Voltage | 1.230V ±2.4% - sets output voltage accuracy via external R1/R2 divider; determines regulation tolerance across temperature and line/load. |
| Soft Start Current | 2.5–7.5µA (typ) - controls ramp rate of COMP pin voltage during startup, limiting inrush current into output capacitor without auxiliary circuitry. |
| Thermal Shutdown Threshold | 150°C junction - protects die during overload or poor heatsinking; recovery occurs after cooldown with hysteresis. |
| UVLO Threshold | 2.85V (typ), 2.95V (max) - prevents erratic operation during brownout; ensures clean start-up only when input exceeds safe minimum. |
Pinout & Package
UC2577TDTR-ADJG3 is housed in a 5-pin DDPAK/TO-263 package (Package Drawing KTT) with exposed thermal pad for enhanced power dissipation. The package supports surface-mount assembly and requires PCB copper area under the pad for thermal management per JEDEC standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Supply | Primary DC input connection (3.0V–40V); must be bypassed with low-ESR ceramic capacitor near pin. |
| GND | Power Ground | Common return path for input, output, and internal circuits; connects to thermal pad for heat transfer. |
| SWITCH | NPN Collector Output | Switch node connecting to inductor and flyback/flywheel diode; carries high di/dt and requires tight layout. |
| FB | Feedback Input | High-impedance input sensing divided output voltage; referenced to 1.23V internal reference for regulation. |
| COMP | Compensation Output | Error amplifier output; drives external RC network to set loop stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3.0A NPN Power Switch | Eliminates need for external transistor and driver; reduces BOM count and layout complexity in boost/flyback designs. |
| Current-Mode Control Architecture | Provides inherent cycle-by-cycle current limiting, improved line/load regulation (<50mV), and simplified loop compensation. |
| 52kHz Fixed-Frequency Oscillator | Enables predictable EMI profile and eliminates timing component variability; supports standard off-the-shelf inductors. |
| Soft-Start Function | Internally controlled ramp on COMP pin limits peak inductor current at startup, preventing output overshoot and input surge. |
| Comprehensive Protection Suite | Includes undervoltage lockout (2.85V), thermal shutdown (150°C), and current limiting-no external fault monitoring required. |
Applications
| Industrial Power Supply | Battery-Powered Test Equipment |
|---|---|
Use Scenario: Generating +24V or +48V rail from 12V nominal bus in programmable logic controllers (PLCs) and sensor interface modules. IC Role / Device Role / Timing Role: Primary step-up regulator controlling energy transfer via internal NPN switch and external inductor/diode. Use Value: Delivers regulated high-voltage output with <50mV line regulation and built-in thermal protection-reducing need for external supervision circuitry. |
Use Scenario: Boosting single-cell Li-ion (3.0–4.2V) to 12V for analog front-end circuitry in handheld multimeters and portable oscilloscopes. IC Role / Device Role / Timing Role: Adjustable-output DC-DC converter providing stable supply independent of battery state-of-charge. Use Value: Maintains output regulation across full input range (3.0V–40V) with soft-start preventing inrush into capacitive loads during wake-up. |
| Flyback Isolated Bias Supply | Distributed Telecom Power |
Use Scenario: Generating isolated +5V/-5V bias rails for gate drivers in AC-DC PFC stages using transformer-coupled flyback topology. IC Role / Device Role / Timing Role: Controller IC driving primary-side NPN switch; feedback via optocoupler to FB pin. Use Value: Supports flyback operation with internal current limit and 65V switch rating-enabling compact, low-component-count isolated supplies. |
Use Scenario: Providing +36V intermediate bus from 24V telecom shelf supply for remote radio head (RRH) power amplifiers. IC Role / Device Role / Timing Role: High-efficiency boost converter operating at 52kHz with minimal external components. Use Value: Achieves >80% efficiency at 800mA load with integrated switch and current-mode control-reducing thermal design burden in dense RF enclosures. |
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 max switch current (3A vs. UC2577's 3A), identical 52kHz frequency and 1.23V reference. | Same boost/flyback topologies; LM2577 lacks soft-start current spec and has looser reference tolerance (±3% vs. ±2.4%). | Select UC2577TDTR-ADJG3 for tighter output accuracy and guaranteed soft-start behavior in new designs. |
| TPS61088RHLR | Modern synchronous boost controller (5.5V–18V input, 20V max output); integrates MOSFETs, supports 10A peak, 1MHz switching. | Not pin-compatible; requires different magnetics and layout; suited for higher-frequency, lower-voltage, higher-current apps. | Choose TPS61088RHLR only when input <18V and output ≤20V-UC2577TDTR-ADJG3 remains preferred for 40V input or >20V output requirements. |
Compared with LM2577-ADJ, UC2577TDTR-ADJG3 offers tighter reference voltage tolerance and defined soft-start current; versus TPS61088RHLR, it supports wider input range and higher output voltage but at lower frequency and without synchronous rectification-making it optimal for cost-sensitive, high-voltage industrial boost designs.
Availability
UC2577TDTR-ADJG3 is available at Aetrix Electronics and suitable for industrial power supplies, battery-powered instrumentation, distributed telecom power, and isolated bias generation requiring stable component supply and long-term manufacturability.
Supply support for UC2577TDTR-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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The UC2577 series belongs to TI's legacy power management portfolio designed specifically for simple, robust, high-voltage DC-DC conversion in cost-sensitive and thermally constrained applications-emphasizing minimal external components and intrinsic protection.
FAQ
What is the maximum output voltage achievable with UC2577TDTR-ADJG3 in boost configuration?
The UC2577TDTR-ADJG3 supports up to 60V output in standard boost topology, limited by its 65V-rated internal NPN switch and recommended operating range. When used in flyback or forward configurations with transformer isolation, output voltages exceeding 60V are possible-subject to external component ratings and safety clearance requirements. Always observe the 65V absolute maximum switch voltage rating.
Does UC2577TDTR-ADJG3 require an external diode, and what type is recommended?
Yes, UC2577TDTR-ADJG3 requires an external flywheel diode connected between the SWITCH pin and output capacitor. Schottky diodes are strongly recommended for efficiency-e.g., MBR340P (40V, 3A) for ≤40V outputs or MBR3100CT (100V, 3A) for higher-voltage designs. Fast-recovery diodes may be used where Schottky reverse leakage is unacceptable, though at reduced efficiency.
How is output voltage adjusted on UC2577TDTR-ADJG3?
Output voltage is set using a resistor divider from VOUT to GND, with the midpoint connected to the FB pin. The internal 1.23V reference determines regulation point: VOUT = 1.23V × (1 + R1/R2). For example, R1 = 48.7kΩ and R2 = 5.62kΩ yields ~12V output. Resistor tolerances directly impact output accuracy-1% metal-film types are recommended.
What thermal management is required for UC2577TDTR-ADJG3 in continuous 2A output operation?
At 2A output with typical 12V→24V boost, UC2577TDTR-ADJG3 dissipates ~1.5W. With θJA = 65°C/W, junction rise is ~98°C above ambient-requiring ≥4 cm² of 2-oz copper connected to the exposed thermal pad. A small heatsink or forced airflow is advised for sustained >1.5A operation at 70°C ambient to maintain junction temperature below 125°C.
Is UC2577TDTR-ADJG3 RoHS compliant and lead-free?
Yes, UC2577TDTR-ADJG3 is manufactured with Green (RoHS & no Sb/Br) compliance per TI's packaging addendum. It uses lead-free CU SN terminations and meets JEDEC MSL Level-2 moisture sensitivity requirements. No lead-based exemptions apply-the device is fully Pb-free and halogen-free per EU Directive 2011/65/EU.
UC2577TDTR-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)
UC2577TDTR-ADJG3 FAQ
1.How can I place an order for UC2577TDTR-ADJG3 through Aetrix?
Please submit a Request for Quotation (RFQ) for UC2577TDTR-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 UC2577TDTR-ADJG3 reliable?
The price and inventory of UC2577TDTR-ADJG3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC2577TDTR-ADJG3 is usually 5 days.
3.What payment methods are accepted for UC2577TDTR-ADJG3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC2577TDTR-ADJG3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC2577TDTR-ADJG3?
UC2577TDTR-ADJG3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC2577TDTR-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 UC2577TDTR-ADJG3?
For technical support, including UC2577TDTR-ADJG3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC2577TDTR-ADJG3 requirements.
6.How does Aetrix verify that UC2577TDTR-ADJG3 is sourced from the original manufacturer or authorized distributors?
All UC2577TDTR-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 UC2577TDTR-ADJG3 meets industry standards.
7.What is the process for return or replacement of UC2577TDTR-ADJG3?
All UC2577TDTR-ADJG3 units undergo pre-shipment inspection (PSI). If there is an issue with UC2577TDTR-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 UC2577TDTR-ADJG3 part is unused and in its original packaging.
Return procedure for UC2577TDTR-ADJG3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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