UC2844BN STMicroelectronics Integrated Circuit (Dual-In-Line Packages) In Stock
UC2844BN is a current-mode PWM controller IC by STMicroelectronics for boost and flyback SMPS designs. Key specs: 11 V to 30 V input, 500 kHz switching frequency, 1 A gate drive output, 8-pin PDIP package. From $0.85 in stock, worldwide shipping.
- Manufacturer
- STMicroelectronics
- Package
- Dual-In-Line Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- UC2844BN Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.4492(MOQ 50)
- Temp Range
- -25.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of UC2844BN?
- Current-mode PWM control with cycle-by-cycle current limiting provides inherent short-circuit protection and excellent line/load transient response in flyback and boost converters
- 500 kHz maximum switching frequency allows use of smaller magnetics and output capacitors, reducing total converter size and BOM cost
- 11 V to 30 V wide input voltage range with 1 A peak gate-drive output current for driving external MOSFETs up to 500 kHz without additional driver stages
- 8-pin PDIP through-hole package simplifies prototyping and field-repair of industrial SMPS modules without specialized SMD rework tooling
What is UC2844BN used for?
UC2844BN is used in offline flyback power supplies for industrial control equipment, where current-mode control simplifies slope compensation and delivers fast response to load transients across 11 V to 30 V input ranges. It suits boost converter designs in battery-operated test instruments and telecom equipment where 500 kHz switching keeps magnetic component size minimal. The device is also a proven choice for isolated DC-DC converter modules in motor drives and PLC power rails requiring cycle-by-cycle overcurrent shutdown.
What are the specifications of UC2844BN?
| Factory Lead Time | 14Weeks |
| YTEOL | 6 |
| Analog IC - Other Type | SWITCHING CONTROLLER |
| Control Mode | CURRENT-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 30V |
| Input Voltage-Min | 11V |
| Input Voltage-Nom | 15V |
| JESD-30 Code | R-PDIP-T8 |
| JESD-609 Code | e3 |
| Number of Functions | 1 |
| Output Current-Max | 1A |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP8,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Qualification Status | Not Qualified |
| Surface Mount | NO |
| Switcher Configuration | SINGLE |
| Switching Frequency-Max | 500kHz |
| Technology | BIPOLAR |
| Temperature Grade | COMMERCIAL EXTENDED |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| ## UC2844BN Alternates Showing results | Image |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Mainland China |
Where can I find the UC2844BN datasheet?
UC2844BN Datasheet DownloadOfficial datasheet from STMicroelectronics
What are equivalent replacements for UC2844BN?
Compatible alternatives and drop-in replacements for UC2844BN:
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Frequently Asked Questions
What switching frequency can UC2844BN achieve, and how does that affect transformer size?
UC2844BN supports switching frequencies up to 500 kHz, set by an external resistor-capacitor network. At 500 kHz, the flyback transformer core can be reduced to roughly one-quarter the size needed at 125 kHz, significantly shrinking the overall power supply footprint and weight.
How does UC2844BN's current-mode control improve protection against output short circuits?
UC2844BN implements cycle-by-cycle peak current limiting: each switching cycle, the controller compares the sensed MOSFET drain current against a reference and terminates the gate pulse the instant the peak current limit—set by the current sense resistor—is exceeded. This limits peak inductor current to a safe value within 1 switching cycle, typically under 2 µs at 500 kHz, preventing transformer saturation and MOSFET damage during output short circuits.
What input voltage range does UC2844BN require for startup and normal operation?
UC2844BN starts up when VCC reaches 11 V (UVLO threshold) and operates continuously down to a lower UVLO stop threshold of approximately 10 V, with a maximum rated VCC of 30 V. This 11 V to 30 V operating window matches bulk capacitor voltages typical of offline rectified supplies using 85 V to 265 V AC input ranges.
When should a designer choose UC2844BN over a voltage-mode controller such as UC3842B for a flyback SMPS?
UC2844BN (current-mode) is preferred when load regulation better than 1% is needed or when paralleling power stages: current-mode control inherently balances current sharing between paralleled converters without additional circuitry, whereas UC3842B voltage-mode requires an additional current-balancing loop. UC2844BN also eliminates the right-half-plane zero effect at light loads common in voltage-mode flyback designs.
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Why Buy from FindMyChip
About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 50+ | $0.9404 | $47.02 |
| 250+ | $0.5550 | $138.75 |
| 500+ | $0.4870 | $243.50 |
| 1000+ | $0.4732 | $473.20 |
| 2000+ | $0.4492 | $898.40 |
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