UC2844AQD8 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments UC2844AQD8 is a current-mode PWM controller IC in an 8-pin SOIC package with 12 V to 28 V input range. It provides pulse-width modulation control for flyback and forward converter topologies with cycle-by-cycle current limiting. Available from stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- OBSOLETE
- Datasheet
- UC2844AQD8 Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.7768(MOQ 525)
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Current-mode PWM control with cycle-by-cycle current limiting for inherent short-circuit protection in switching supplies
- 12 V to 28 V input operating range suitable for offline and industrial DC/DC power converter designs
- 8-pin SOIC package enabling compact switch-mode power supply controller layouts with minimal external components
- Fixed-frequency oscillator with programmable frequency via single resistor-capacitor network
Applications
The UC2844AQD8 is used as the primary controller in flyback, forward, and other isolated switch-mode power supplies for industrial, telecom, and consumer applications. Its current-mode control with a 12 V to 28 V input range makes it well suited for AC/DC adapters, battery chargers, and distributed power systems. It is also applied in motor drive auxiliary supplies and lighting ballasts where robust overcurrent protection is required.
Specifications
| YTEOL | 0 |
| Analog IC - Other Type | SWITCHING CONTROLLER |
| Control Mode | CURRENT-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 28V |
| Input Voltage-Min | 12V |
| Input Voltage-Nom | 15V |
| JESD-30 Code | R-PDSO-G8 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Output Current-Max | 1A |
| Output Voltage-Max | 5.05V |
| Output Voltage-Min | 4.95V |
| Output Voltage-Nom | 5V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP8,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Current-Max (Isup) | 25mA |
| Supply Voltage-Max (Vsup) | 28V |
| Supply Voltage-Min (Vsup) | 16V |
| Supply Voltage-Nom (Vsup) | 11V |
| Surface Mount | YES |
| Switcher Configuration | BUCK-BOOST |
| Switching Frequency-Max | 500kHz |
| Technology | BIPOLAR |
| Temperature Grade | AUTOMOTIVE |
| 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 | 8542.39.00.60 |
| Country of Origin | Malaysia |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What input voltage range does the UC2844AQD8 support, and which converter topologies is it designed for?
The UC2844AQD8 operates from 12 V to 28 V input and is designed primarily for flyback and forward converter topologies using current-mode PWM control. It is widely used in offline power supplies and industrial DC/DC converters where cycle-by-cycle current limiting provides inherent overload protection.
How does current-mode control in the UC2844AQD8 improve overcurrent protection compared to voltage-mode PWM?
Current-mode control in the UC2844AQD8 senses the switch current on every cycle and terminates the gate drive pulse immediately when the current exceeds a programmed threshold. This cycle-by-cycle limiting prevents transformer saturation and protects the power switch from damage during sudden load transients or output short-circuit conditions.
For a 24 V bus industrial power supply design, how is the UC2844AQD8 switching frequency set?
The oscillator frequency of the UC2844AQD8 is programmed with a single external resistor and capacitor connected to the RT/CT pin. Designers select component values to target frequencies typically in the range of 20 kHz to 500 kHz, balancing magnetic component size against switching losses within the 12 V to 28 V input operating window.
When would a designer choose UC2844AQD8 over a UC3842 in a new power supply design?
The UC2844AQD8 is preferred when the input supply voltage is guaranteed to remain above 12 V, as its higher under-voltage lockout threshold reduces false starts during slow power-rail ramp-up. In contrast, UC3842 has a lower UVLO threshold of around 8 V, making it better for lower-voltage auxiliary rails. Both share the same 8-pin SOIC pinout.
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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 |
|---|---|---|
| 525+ | $0.8318 | $436.71 |
| 1050+ | $0.8047 | $844.93 |
| 2550+ | $0.7768 | $1980.94 |
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