Packaging information
| Package | Pins CDIP (JG) | 8 |
| Operating temperature range (°C) -55 to 125 |
| Package qty | Carrier 50 | TUBE |
Features for the UC1844A-SP
- QML Class V (QMLV) Qualified, SMD 5962-86704
- Rad-Tolerant: 30-krad(Si) TID (1) (2)
- Optimized for Offline and DC-to-DC Converters
- Low Start-Up Current (< 0.5 mA)
- Trimmed Oscillator Discharge Current
- Automatic Feed Forward Compensation
- Pulse-by-Pulse Current Limiting
- Enhanced Load Response Characteristics
- Undervoltage Lockout (UVLO) With Hysteresis
- Double-Pulse Suppression
- High-Current Totem-Pole Output
- Internally-Trimmed Bandgap Reference
- 500-kHz Operation
- Low RO Error Amplifier
(1)The LDR improved die is only available in the UC1843A-SP (orderable as 5962-8670409VPA). Contact factory to request an LDR-improved version of the UC1842A-SP or UC1844A-SP.
(2)Radiation tolerance is a typical value based upon initial device qualification with dose rate = 10 mrad(Si)/s. Radiation lot acceptance testing is available - contact factory for details.
Description for the UC1844A-SP
The UC184xA-SP family of control ICs is a pin-for-pin compatible improved version of the UC184x family. Providing the necessary characteristics to control current-mode switched-mode power supplies, this device has improved features. Start-up current is specified to be less than 0.5 mA and oscillator discharge is trimmed to 8.3 mA. During UVLO, the output stage can sink at least 10 mA at less than 1.2 V for VCC over 5 V.
The Device Comparison Table shows the difference between members of this family. Reference the individual product data sheets for ordering the radiation-improved version if available.