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Texas Instruments UCC2803DG4
- Part No.:
- UCC2803DG4
- Manufacturer:
- Texas Instruments
- Category:
- Power Supply Controllers, Monitors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UCC2803DG4.pdf
- Description:
- IC REG CTRLR MULT TOPOLOGY 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,429
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Product details
Overview
UCC2803DG4 from Texas Instruments is a low-power BiCMOS current-mode PWM controller designed for fixed-frequency DC-to-DC and off-line switch-mode power supplies. It features 4 V reference voltage, 4.1 V UVLO turn-on threshold, 100% maximum duty cycle, 1 A totem-pole gate driver output, and internal leading-edge blanking - enabling compact, battery-operated PSU designs with minimal external components.
For engineers reviewing the UCC2803DG4 datasheet, UCC2803DG4 pinout, UCC2803DG4 application, or UCC2803DG4 equivalent, key selection criteria include its low 100 μA start-up current, compatibility with UC3842/UC3842A footprints, 4 V reference optimized for low-input systems, and integrated full-cycle soft start eliminating external timing components.
Technical Context
The UCC2803DG4 implements a current-mode control architecture with dual comparators on the CS pin (PWM + overcurrent), digital leading-edge blanking (50–150 ns), and a true low-impedance 2-MHz error amplifier capable of sourcing/sinking COMP current. Its oscillator uses REF-derived charging current and RC timing, supporting up to 1 MHz operation with frequency set by Equation f = 1.0/(R × C).
Unlike UC3842-family predecessors, it integrates full-cycle fault soft start, eliminates need for external RC filter on CS, and provides 70 ns current-sense-to-gate-response - critical for high-efficiency, fast-transient battery-powered converters operating across –40°C to 125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 4.0 V ±1.5% - enables stable feedback in low-input-voltage battery systems (e.g., 5 V rail or single-cell Li-ion). |
| UVLO Turn-on Threshold | 4.1 V (typ) - ensures reliable startup in low-voltage battery-operated PSUs without premature oscillation. |
| Max Duty Cycle | 99% - supports wide input/output ratios in buck, flyback, and forward topologies without external duty-limiting circuitry. |
| Gate Drive Output | ±1 A peak - directly drives medium-size MOSFETs (Qg ≤ 20 nC at 300 kHz) without buffer stages. |
| Start-up Supply Current | 100 μA (typ) - minimizes auxiliary supply losses and extends runtime in energy-constrained applications. |
| CS Leading-Edge Blanking | 100 ns (typ) - suppresses switching noise-induced false overcurrent trips, removing need for external RC filter on current-sense node. |
| Error Amp GBW | 2 MHz - enables faster loop response than UC3842 (1 MHz), improving transient regulation in dynamic load scenarios. |
Pinout & Package
UCC2803DG4 is housed in an 8-pin SOIC (D package), 3.91 mm × 4.90 mm body size, with Gull-wing leads and standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - COMP | Error amplifier output / PWM comparator input | True low-Z op-amp output; sources/sinks current; clamped during soft start to limit max duty cycle. |
| 2 - FB | Inverting input of error amplifier | Connects to voltage divider from output; 2 MHz bandwidth enables tighter regulation vs UC3842. |
| 3 - CS | Current sense input (dual comparator) | Feeds both PWM and overcurrent comparators; internal 100 ns blanking prevents false triggering on MOSFET turn-on spikes. |
| 4 - RC | Oscillator timing node | RC network sets frequency per f = 1.0/(R × C); REF supplies charging current; requires short GND trace for stability. |
| 5 - GND | Power and signal reference ground | Common return for VCC, REF, CS, FB, COMP, OUT; must be low-inductance connection to minimize noise coupling. |
| 6 - OUT | High-current gate driver output | ±1 A capable totem-pole stage; actively held low during UVLO; no external clamp diodes needed in most layouts. |
| 7 - VCC | Supply input with UVLO detection | Powered via current-limiting resistor; 4.1 V turn-on / 3.6 V turn-off hysteresis ensures clean startup/shutdown in brownout conditions. |
| 8 - REF | 4 V precision reference output | Bypass with ≥0.1 µF ceramic close to pin; supplies oscillator charging current and logic rails; load-limited to 5 mA. |
Key Features
| Feature | Design Value |
|---|---|
| Internal full-cycle soft start | COMP voltage ramps to REF in ~4 ms - eliminates external soft-start circuit (1 resistor, 1 capacitor, 1 transistor) and prevents inrush current stress. |
| Digital leading-edge blanking | 100 ns hardware blanking window after OUT rising edge - removes need for analog RC filter on CS, reducing BOM count and propagation delay. |
| UC3842/UC3842A pin-compatible layout | Same 8-pin SOIC footprint and signal mapping - allows drop-in upgrade path with improved efficiency and reduced component count. |
| Low 500 μA operating supply current | Reduces auxiliary supply loading and thermal dissipation - critical for sealed or thermally constrained battery-powered enclosures. |
| 70 ns CS-to-OUT response | Enables precise current limiting at high switching frequencies (>500 kHz) - improves reliability under short-circuit and overload conditions. |
Applications
| Portable Medical Device PSU | Industrial Sensor Node DC-DC |
|---|---|
Use Scenario: Compact, isolated 5 V/1 A power supply for handheld ultrasound or glucose monitor powered by single Li-ion cell (2.7–4.2 V). IC Role / Device Role / Timing Role: Primary PWM controller implementing current-mode flyback with 300 kHz switching, using internal 4 V reference for tight output regulation. Use Value: 100 μA start-up current extends standby time; integrated soft start prevents inrush into capacitive loads; 4.1 V UVLO avoids erratic operation near battery depletion. | Use Scenario: Non-isolated buck converter powering 3.3 V microcontroller and analog sensors in factory-floor wireless node with 12 V nominal input. IC Role / Device Role / Timing Role: Fixed-frequency current-mode buck controller with RC-set 600 kHz operation, leveraging 2 MHz error amp for fast load-step response. Use Value: 70 ns CS-to-OUT latency enables accurate peak-current limiting; 1 A gate drive eliminates external driver; SOIC package supports automated assembly. |
| Automotive Body Control Module | USB-C PD Accessory Power Stage |
Use Scenario: 12 V input to 5 V/2 A supply for interior lighting control module operating across automotive cold-crank (4.5 V) to load-dump (18 V) transients. IC Role / Device Role / Timing Role: Current-mode boost controller with external MOSFET, using CS blanking to reject cranking noise and REF-based oscillator for stable timing. Use Value: –40°C to 125°C rating ensures operation in engine bay; 4.1 V UVLO guarantees startup even during cold-crank; 99% duty cycle supports wide VIN/VOUT ratios. | Use Scenario: Secondary-side synchronous rectification controller in 20 W USB-C PD adapter, regulating 5 V/3 A output with tight ripple and fast transient response. IC Role / Device Role / Timing Role: Primary-side PWM controller driving QR flyback topology; internal 4 V reference interfaces directly with optocoupler feedback network. Use Value: 1.5% reference tolerance maintains ±1% output accuracy; low 500 μA quiescent current reduces no-load losses; SOIC package simplifies thermal management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-mode PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UC3842N | 5 V reference, 16 V UVLO, 1 MHz max frequency limited by internal oscillator design, no leading-edge blanking, open-collector COMP. | Requires external RC filter on CS; higher start-up current (1 mA); less suitable for battery systems below 6 V. | Select UC3842N only when legacy design reuse or cost sensitivity outweighs efficiency and noise immunity requirements. |
| UCC2803DR | Identical electrical specs and pinout; same SOIC-8 package but tape-and-reel packaging (DR suffix), not tube (DG4). | No functional difference; identical performance and thermal behavior; differs only in packaging format and reel quantity. | Choose UCC2803DR for automated SMT production requiring tape-and-reel delivery; UCC2803DG4 suits prototyping and low-volume hand assembly. |
Compared with UC3842N, UCC2803DG4 delivers 10× lower start-up current and integrated blanking for noise immunity; versus UCC2803DR, it offers identical functionality in tube packaging - making UCC2803DG4 optimal for engineering validation and small-batch builds where tube handling is preferred.
Availability
UCC2803DG4 is available at Aetrix Electronics and suitable for portable medical device PSUs, industrial sensor node DC-DC converters, and automotive body control modules requiring stable component supply, long-term lifecycle support, and guaranteed authentic Texas Instruments sourcing.
Supply support for UCC2803DG4 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 with emphasis on reliability, longevity, and automotive-grade qualification.
The UCC280x product line was engineered specifically for high-efficiency, low-component-count current-mode switch-mode power supplies - targeting battery-operated, industrial, and automotive applications demanding wide temperature range and robust noise immunity.
FAQ
What is the UVLO hysteresis of the UCC2803DG4?
The UCC2803DG4 has a UVLO turn-on threshold of 4.1 V (typ) and turn-off threshold of 3.6 V (typ), resulting in 0.5 V hysteresis. This ensures clean startup and shutdown behavior during battery voltage sag or recovery, preventing oscillatory operation near the undervoltage boundary. The hysteresis is internally fixed and not user-adjustable.
Can the UCC2803DG4 replace a UC3842 in an existing design?
Yes, the UCC2803DG4 uses the same 8-pin SOIC footprint and pin functions as the UC3842, enabling direct PCB replacement. However, due to its 4 V reference (vs 5 V), lower UVLO, and integrated soft start, minor feedback resistor and startup network adjustments may be needed. Always verify loop stability and transient response after substitution.
What is the maximum recommended oscillator frequency for the UCC2803DG4?
The UCC2803DG4 supports oscillator frequencies up to 1 MHz, as confirmed in its datasheet Features section and Electrical Characteristics table. At 1 MHz, typical operation requires RT = 10 kΩ and CT = 100 pF. Thermal derating and layout parasitics should be considered above 600 kHz to maintain timing accuracy and gate drive integrity.
Does the UCC2803DG4 require an external RC filter on the CS pin?
No, the UCC2803DG4 incorporates internal digital leading-edge blanking (50–150 ns) that disconnects the CS pin from comparators immediately after the OUT rising edge. This eliminates the need for external RC filtering in most applications, reducing component count and propagation delay - unlike UC3842, which mandates external filtering.
What is the purpose of the REF pin on the UCC2803DG4?
The REF pin on the UCC2803DG4 outputs a stable 4.0 V ±1.5% reference used for the error amplifier, oscillator charging current, and internal logic. It must be bypassed with ≥0.1 µF ceramic capacitor to GND, placed adjacent to the pin. REF can also serve as a power-good indicator when VCC rises above 1 V but remains below UVLO threshold.
UCC2803DG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Programmable:
- -
- Applications:
- PWM Controller
- Voltage - Input:
- -0.3V ~ 6.3V
- Voltage - Supply:
- 3.6V ~ 11V
- Current - Supply:
- 500 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
UCC2803DG4 FAQ
1.How can I place an order for UCC2803DG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC2803DG4 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 UCC2803DG4 reliable?
The price and inventory of UCC2803DG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC2803DG4 is usually 5 days.
3.What payment methods are accepted for UCC2803DG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC2803DG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC2803DG4?
UCC2803DG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC2803DG4 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 UCC2803DG4?
For technical support, including UCC2803DG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC2803DG4 requirements.
6.How does Aetrix verify that UCC2803DG4 is sourced from the original manufacturer or authorized distributors?
All UCC2803DG4 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 UCC2803DG4 meets industry standards.
7.What is the process for return or replacement of UCC2803DG4?
All UCC2803DG4 units undergo pre-shipment inspection (PSI). If there is an issue with UCC2803DG4, 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 UCC2803DG4 part is unused and in its original packaging.
Return procedure for UCC2803DG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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