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UC2844N/81291
Texas Instruments
SWITCHING CONTROLLER
2168 Pcs New Original In Stock
Boost, Buck, Flyback, Forward Regulator Positive, Isolation Capable Output Step-Up, Step-Down, Step-Up/Step-Down DC-DC Controller IC 8-PDIP
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Minimum 1
5.0 / 5.0
- (387 Ratings)
UC2844N/81291
Product Overview
9200885
DiGi Electronics Part Number
UC2844N/81291-DGManufacturer
Texas Instruments
UC2844N/81291
Description
SWITCHING CONTROLLERInventory
2168 Pcs New Original In Stock
Boost, Buck, Flyback, Forward Regulator Positive, Isolation Capable Output Step-Up, Step-Down, Step-Up/Step-Down DC-DC Controller IC 8-PDIP
Quantity
Minimum 1
Minimum 1
Purchase and inquiry
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UC2844N/81291 Technical Specifications
Category
Power Management (PMIC), DC DC Switching Controllers
Packaging
Bulk
Series
-
Product Status
Active
Output Type
Transistor Driver
Function
Step-Up, Step-Down, Step-Up/Step-Down
Output Configuration
Positive, Isolation Capable
Topology
Boost, Buck, Flyback, Forward
Number of Outputs
1
Output Phases
1
Voltage - Supply (Vcc/Vdd)
12V ~ 28V
Frequency - Switching
Up to 500kHz
Duty Cycle (Max)
48%
Synchronous Rectifier
No
Clock Sync
No
Serial Interfaces
-
Control Features
Frequency Control
Operating Temperature
-40°C ~ 85°C (TA)
Mounting Type
Through Hole
Package / Case
8-DIP (0.300", 7.62mm)
Supplier Device Package
8-PDIP
Base Product Number
UC2844
Datasheet & Documents
HTML Datasheet
UC2844N/81291-DG
Environmental & Export Classification
RoHS Status
Not applicable
Moisture Sensitivity Level (MSL)
3 (168 Hours)
REACH Status
Vendor Undefined
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
2156-UC2844N/81291
TEXTISUC2844N/81291
Standard Package
470
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
처음 방문했는데도 불구하고 친절한 설명과 서비스에 만족했어요.
de desembre 02, 2025
Dank der fairen Preise konnte ich mehr einkaufen, ohne mein Budget zu sprengen.
de desembre 02, 2025
Their product range maintains high standards across the board.
de desembre 02, 2025
Their logistics team works tirelessly to meet tight deadlines efficiently.
de desembre 02, 2025
Their after-sales support exceeded my expectations—fast, helpful, and courteous.
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Frequently Asked Questions (FAQ)
What are the key design risks when using the UC2844N/81291 in a high-frequency flyback converter above 300kHz?
When operating the UC2844N/81291 above 300kHz, the primary risks include increased switching losses due to limited gate drive strength and propagation delay variation across temperature. The UC2844N/81291 has a maximum switching frequency of 500kHz, but gate drive rise/fall times and external MOSFET selection become critical at higher frequencies. To mitigate, use low gate charge MOSFETs (like IRFP460LC), minimize PCB gate loop inductance, and consider adding a small gate resistor (5–10Ω) to suppress ringing. Additionally, ensure the transformer core material (e.g., ferrite like N87 or PC95) supports the frequency without excessive core loss. Derating output power above 300kHz is recommended for reliable long-term operation.
Can the UC2844N/81291 directly replace the UC3844 in an existing boost converter design without modifying the feedback or current sense circuitry?
The UC2844N/81291 can generally replace the UC3844 in a boost converter, as both share similar pinouts, control architecture, and current-mode control characteristics. However, the UC2844N/81291 is specified for operation from -40°C to 85°C (vs UC3844’s -40°C to 125°C), making it unsuitable for high-ambient industrial environments. Also verify the feedback compensation network and current sense resistor power rating, as variations in error amplifier gain and oscillator stability may affect loop dynamics. Always re-validate stability with load transients and line regulation under full operating conditions.
How should the UC2844N/81291 be configured for a reliable buck-boost topology with a wide input voltage range (12V to 24V) and 12V output?
The UC2844N/81291 supports buck-boost operation via external circuitry, but it does not natively support inverting configurations. To implement buck-boost, use a flyback or buck-boost isolated topology with appropriate transformer coupling. For a non-isolated design, a Cuk or SEPIC configuration may be more appropriate. When using flyback, ensure the transformer turns ratio and primary inductance are optimized for both minimum (12V) and maximum (24V) input to prevent current runaway during low-line conditions. Use leading-edge blanking on the current sense pin and slope compensation if operating above 50% duty cycle to maintain stability.
What are the reliability concerns with the UC2844N/81291 in through-hole industrial equipment exposed to thermal cycling and vibration?
The UC2844N/81291 in 8-PDIP package is through-hole mounted, which generally offers better mechanical robustness under vibration compared to SMD, making it suitable for industrial environments. However, thermal cycling can induce solder joint fatigue due to CTE mismatch between the lead frame and PCB. To improve reliability, use solder joints with enhanced fatigue resistance (e.g., SnAgCu alloy), limit board-level temperature swings via thermal management, and avoid placing near high-dissipation components. Additionally, ensure supply voltage is well-decoupled (10µF tantalum + 100nF ceramic close to VCC pin) to prevent latch-up during transient dips.
How does the UC2844N/81291 compare to the UC2845N in terms of current limiting accuracy and startup behavior in a line-powered flyback SMPS?
The UC2844N/81291 and UC2845N differ primarily in current sense threshold and startup features. The UC2844N/81291 has a higher current sense threshold (1.0V typical) compared to the UC2845N (0.7V), offering better noise margin in high-current designs but requiring higher sense resistor power dissipation. The UC2845N integrates soft-start functionality, while the UC2844N/81291 does not, leading to potential inrush current during startup unless an external soft-start capacitor is added on the COMP pin. In line-powered flyback supplies, adding a soft-start network (e.g., 22kΩ resistor and 100nF cap from COMP to GND) is recommended with the UC2844N/81291 to limit transformer saturation during start-up.
Quality Assurance (QC)
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UC2844N/81291 CAD Models
Texas Instruments UC2844N/81291 PCB symbols & footprints
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