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UC3844BD1 from ST,ST Microelectronics

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31.006ms

UC3844BD1

Manufacturer: ST

High Performance Current Mode Controller

Partnumber Manufacturer Quantity Availability
UC3844BD1 ST 500 In Stock

Description and Introduction

High Performance Current Mode Controller The UC3844BD1 is a high-performance current-mode PWM controller manufactured by STMicroelectronics.  

### **Specifications:**  
- **Input Voltage Range:** 7.6V to 30V  
- **Operating Frequency:** Up to 500kHz  
- **Output Duty Cycle:** 0% to <50%  
- **Peak Output Current:** ±1A (sink/source)  
- **Reference Voltage:** 5V (±1% tolerance)  
- **Undervoltage Lockout (UVLO):**  
  - Turn-on: 8.4V (typ)  
  - Turn-off: 7.6V (typ)  
- **Current Sense Comparator Threshold:** 1V  
- **Error Amplifier Gain Bandwidth:** 1MHz  
- **Operating Temperature Range:** -40°C to +85°C  
- **Package:** SOIC-8  

### **Descriptions:**  
The UC3844BD1 is a fixed-frequency PWM controller optimized for DC-DC converter applications. It features current-mode control for improved loop response and includes a built-in oscillator, error amplifier, current sensing comparator, and a totem-pole output stage.  

### **Features:**  
- **Current-Mode Control** for simplified loop compensation  
- **Automatic Feed-Forward Compensation**  
- **Latching PWM** for cycle-by-cycle current limiting  
- **Internal Trimmed Bandgap Reference** (5V ±1%)  
- **High-Current Totem-Pole Output** (1A peak)  
- **Undervoltage Lockout (UVLO)** with hysteresis  
- **Low Startup and Operating Current**  

This device is commonly used in offline and DC-DC power supplies, battery chargers, and SMPS (Switched-Mode Power Supply) applications.

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