Description
UC2844B High Performance Fixed Frequency Current Mode PWM Controller SOP-8
Product Overview
The UC2844B is a high-performance fixed-frequency current mode PWM controller designed for off-line and DC-DC power supply applications. It integrates precision control circuitry, undervoltage lockout, current limiting, and a high-current totem-pole output stage in a compact SOP-8 package, making it ideal for switch-mode power supplies (SMPS), converters, and power management systems.
Key Features
- Fixed-frequency current mode PWM controller
- Current mode operation up to 500 kHz
- Oscillator frequency guaranteed to 250 kHz
- Low startup current (<0.5 mA)
- High-current totem-pole output
- Cycle-by-cycle current limiting
- Undervoltage lockout (UVLO) with hysteresis
- Precision trimmed reference voltage
- Automatic feed-forward compensation
- Optimized for MOSFET driving
- Compact SOP-8 surface-mount package
Technical Specifications
| Specification |
Details |
| Part Number |
UC2844B |
| Product Type |
PWM Controller IC |
| Control Method |
Current Mode PWM |
| Package Type |
SOP-8 / SOIC-8 |
| Mounting Type |
Surface Mount (SMD) |
| Operating Frequency |
Up to 500 kHz |
| Guaranteed Oscillator Frequency |
250 kHz |
| Startup Current |
< 0.5 mA |
| Supply Voltage (VCC) |
10V – 30V |
| UVLO Threshold |
16V ON / 10V OFF |
| Reference Voltage |
5V |
| Output Type |
Totem Pole |
| Output Drive Current |
±1 A Peak |
| Maximum Duty Cycle |
<50% |
| Operating Temperature |
-40°C to +85°C |
| Technology |
Bipolar |
Applications
- Switch Mode Power Supplies (SMPS)
- AC-DC converters
- DC-DC converters
- Battery chargers
- LED power supplies
- Industrial power control
- Power adapters
- Offline flyback converters
- Embedded power management systems
Package Information
| Parameter |
Value |
| Package |
SOP-8 |
| Pin Count |
8 Pins |
| Mounting |
SMD / SMT |
| Package Width |
Approx. 3.9 mm |
| Pin Pitch |
1.27 mm |
Advantages
- High efficiency current-mode control
- Fast transient response
- Reduced external component count
- Reliable protection features
- Suitable for compact power supply designs
Package Includes
- 1 × UC2844B PWM Controller IC (SOP-8)
Datasheet & Reference
STMicroelectronics Official Product Page
UC2844B Datasheet PDF
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