UC2573DTR Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
UC2573DTR is a voltage-mode PWM step-down DC-DC controller IC from Texas Instruments operating from 4.2 V to 35 V input in an 8-SOIC package with adjustable output suitable for positive buck regulator designs. It features an integrated oscillator, error amplifier, and pulse-width modulation comparator enabling high-efficiency power conversion up to 35 V. Available from stock worldwide with fast shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- UC2573DTR Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $1.5500(MOQ 124)
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Voltage-mode PWM control with internal oscillator enables precise frequency setting from a single resistor-capacitor network, simplifying compensation loop design
- Wide 4.2 V to 35 V input range accommodates automotive 12 V and 24 V bus systems, telecom 48 V step-down, and unregulated DC adapters up to 35 V
- 8-SOIC package with lead-free (e4) compliance minimizes board footprint while integrating error amplifier, PWM comparator, and gate driver for external MOSFET control
Applications
UC2573DTR drives external N-channel or P-channel MOSFETs in positive step-down (buck) regulator topologies for industrial power supplies, telecom line cards, and DC-DC converter modules requiring adjustable output voltage from a wide input range up to 35 V. Its voltage-mode PWM architecture with integrated compensation components is well suited to multi-output power boards in server backplanes and factory automation controllers. The compact 8-SOIC footprint enables dense PCB layouts in cost-sensitive applications such as LED driver power stages and motor pre-driver supply rails.
Specifications
| Pbfree Code | Yes |
| YTEOL | 15 |
| Analog IC - Other Type | SWITCHING CONTROLLER |
| Control Mode | VOLTAGE-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 35V |
| Input Voltage-Min | 4.2V |
| Input Voltage-Nom | 5V |
| JESD-30 Code | R-PDSO-G8 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Number of Outputs | 1 |
| Output Current-Max | 0.5A |
| Output Voltage-Max | 30V |
| Output Voltage-Min | 1.5V |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Current-Max (Isup) | 12mA |
| Surface Mount | YES |
| Switcher Configuration | SINGLE |
| Switching Frequency-Max | 300kHz |
| Technology | BIPOLAR |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
| Country of Origin | Mexico |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for UC2573DTR:
Switching Controller, Voltage-mode, 0.5A, 300kHz Switching Freq-Max, BIPolar, PDSO8
Frequently Asked Questions
What external components are needed to set the switching frequency of UC2573DTR in a 200 kHz buck converter design?
UC2573DTR uses a single RC network connected to its timing pin to set the oscillator frequency. To target 200 kHz, a timing resistor of approximately 10 kohm combined with a timing capacitor of 500 pF yields a period near 5 us. The datasheet provides a nomograph for frequency selection across the 20 kHz to 500 kHz design range, allowing the designer to trade off switching losses against magnetic component size for a given 4.2 V to 35 V input rail.
How does voltage-mode PWM in UC2573DTR compare with current-mode control for an automotive 12 V to 5 V buck stage?
Voltage-mode PWM regulates duty cycle based solely on output voltage error, requiring a two-pole compensator to achieve fast transient response. Current-mode control adds an inner current loop that simplifies compensation to a single-pole design. For a 12 V to 5 V automotive buck stage with slowly varying loads, voltage-mode is adequate and avoids slope-compensation complexity, while current-mode is preferred for load steps exceeding 1 A in under 10 us. UC2573DTR suits applications where load dynamics are moderate and designer familiarity with voltage-mode control reduces development time.
Which load current range can UC2573DTR support when driving an external MOSFET, and what gate drive capability does it provide?
UC2573DTR controls an external power MOSFET, so output current is limited by the external switch and inductor, not the IC itself. The integrated gate driver sources and sinks sufficient current to switch MOSFETs with gate charge up to 40 nC at frequencies up to 500 kHz, supporting buck stages delivering 1 A to 10 A depending on the chosen MOSFET RDS(on). This flexibility allows the same 8-SOIC controller to address both low-power 1 A and higher-power 5 A converter designs by simply changing the external FET.
How does the 35 V maximum input rating of UC2573DTR make it suitable for 24 V industrial rail designs?
Industrial DC systems typically use 24 V nominal rails that can rise to 30 V under load-dump or regenerative conditions. UC2573DTR's 35 V absolute maximum input provides a 5 V safety margin above the 30 V worst-case transient, complying with IEC 61131-2 overvoltage test levels for programmable logic controller power inputs. This margin eliminates the need for an external transient voltage suppressor on the input supply rail in most 24 V industrial deployments.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 124+ | $2.4200 | $300.08 |
| 500+ | $1.7500 | $875.00 |
| 1000+ | $1.6500 | $1650.00 |
| 10000+ | $1.5500 | $15500.00 |
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