SG1844 Series
Current Mode PWMs Isolated Switching Regulators Off-line, 16V UVLO-55°C to125°C
Manufacturer: Microchip Technology
Catalog
Current Mode PWMs Isolated Switching Regulators Off-line, 16V UVLO-55°C to125°C
| Part | Supplier Device Package | Internal Switch(s) | Operating Temperature [Max] | Operating Temperature [Min] | Package / Case | Mounting Type | Output Isolation | Fault Protection | Frequency - Switching [Min] | Frequency - Switching [Max] | Voltage - Supply (Vcc/Vdd) | Duty Cycle | Control Features | Voltage - Start Up | Package / Case | Package / Case | Voltage - Supply (Vcc/Vdd) [Max] | Voltage - Supply (Vcc/Vdd) [Min] |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Microchip Technology | 10-CFlatPack | 125 °C | -55 °C | 10-CFlatPack | Surface Mount | Isolated | Current Limiting | 100 Hz | 500 kHz | 30 V | 48 % | Frequency Control | 16 V | |||||
Microchip Technology | 14-CerDIP | 125 °C | -55 °C | 14-CDIP | Through Hole | Isolated | Current Limiting | 100 Hz | 500 kHz | 30 V | 48 % | Frequency Control | 16 V | |||||
 Microchip Technology | 8-CDIP | 125 °C | -55 °C | 8-CDIP | Through Hole | Isolated | Current Limiting | 100 Hz | 500 kHz | 48 % | Frequency Control | 16 V | 7.62 mm | 0.3 in | 30 V | 10 V |
Key Features
• * Optimized For Off-Line Control
• * Low Start-Up Current (<1mA)
• * Automatic Feed Forward Compensation
• * Trimmed Oscillator Discharge Current
• * Pulse-By-Pulse Current Limiting
• * Enhanced Load Response Characteristics -Undervoltage Lockout with 6V Hysteresis
• * Double-Pulse Suppression
• * High-Current Totem-Pole Output (1A Peak)
• * Internally Trimmed Band-gap Reference
• * 500kHz Operation Under-voltage Lockout: SG1844 - 16 volts
• * Low Shoot-Through Current <75mA Over Temperature
Description
AI
The SG1844/45 family of control ICs provides all the required features to implement off-line Fixed Frequency, Current-mode switching power supplies with a minimum number of external components. Current-mode architecture demonstrates improved line regulation, improved load regulation, pulse-by pulse current limiting and inherent protection of the power supply output switch.
The Bandgap reference is trimmed to ±1% over temperature. Oscillator discharge current is trimmed to less than ±10%. The SG1844/45 has under-voltage lockout, current-limiting circuitry and start-up current of less than 1mA. The totem-pole output is optimized to drive the gate of a power MOSFET. The output is low in the off state to provide direct interface to an Nchannel device. Both operate up to a maximum duty cycle range of zero to <50% due to an internal toggle flip-flop which blanks the output off every other clock cycle. The SG1844/45 is specified for operation over the full military ambient temperature range of -55°C to 125°C. The SG3844/45 is designed for the commercial range of 0°C to 70°C.
**Microchip Ordering Part** [**Standard Microcircuit Drawing (SMD)**](https://ww1.microchip.com/downloads/en/DeviceDoc/00003952.pdf)
SG1844F-DESC Cross Reference 5962-8670403HA
SG1844F-DESC Cross Reference 5962-8670403HX
SG1844J-DESC Cross Reference 5962-8670403CA
SG1844J-DESC Cross Reference 5962-8670403CX
SG1844L-DESC Cross Reference 5962-86704032A
SG1844L-DESC Cross Reference 5962-86704032X
SG1844Y-DESC Cross Reference 5962-8670403PA
SG1844Y-DESC Cross Reference 5962-8670403PX