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SG1845L-883B
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Product Detailed Parameters
- Description：CURRENT MODE PWMS, HIGH-RELIABIL
- Series：-
- Mfr：Microchip Technology
- Package：Tray
- Output Type：Transistor Driver
- Function：Step-Up/Step-Down
- Output Configuration：Positive, Isolation Capable
- Topology：Flyback
- Number of Outputs：1
- Output Phases：1
- Voltage - Supply (Vcc/Vdd)：7.6V ~ 30V
- Frequency - Switching：100Hz ~ 500kHz
- Duty Cycle (Max)：48%
- Synchronous Rectifier：Yes
- Clock Sync：No
- Serial Interfaces：-
- Control Features：-
- Operating Temperature：-55°C ~ 125°C (TA)
- Mounting Type：Surface Mount
- Package / Case：20-CLCC
- Supplier Device Package：20-CLCC (8.89x8.89)
- Grade：Military
- Qualification：MIL-STD-883
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Overview
The SG1845L-883B is a high-reliability current-mode PWM switching controller designed for isolated DC-DC power applications. Manufactured by Microchip Technology, it operates within a frequency range of 100 Hz to 500 kHz and supports flyback topologies. The device features a CLCC-20 package with surface mount installation. It handles output currents up to 1 A and maintains operation across an extended temperature range of -55°C to +125°C. Key electrical parameters include a maximum duty cycle of 100%, rise and fall times of 50 ns, and a quiescent supply current of 11 mA.
Feature Summary
- Implements current-mode pulse width modulation control for precise regulation in isolated switching regulators.
- Supports flyback topology configurations suitable for high-reliability power management systems.
- Features a ceramic metal-sealed cofired CLCC-20 package designed for robust environmental performance.
Applications
- Isolated DC-DC switching regulators
- High-reliability power management ICs
- Flyback converter designs
Procurement Notes
Verify the specific manufacturer designation, as historical records may reference Microsemi Corporation or Microchip Technology due to corporate acquisitions. Confirm that the ordering suffix matches the required reliability grade and packaging specifications. Ensure compatibility with the intended flyback topology and input voltage ranges before finalizing procurement orders.
Selection Notes
Select this component for applications requiring high-reliability current-mode PWM control in isolated environments. Consider the CLCC-20 ceramic package for superior thermal and mechanical stability compared to standard plastic packages. Evaluate the 100 Hz to 500 kHz switching frequency range against system efficiency requirements and electromagnetic interference constraints.
Part Context
This part belongs to the SG18xxL series of high-reliability switching controllers. These components are engineered for demanding industrial and aerospace applications where long-term stability and resistance to harsh conditions are critical. The series typically includes variants optimized for different current capabilities and switching frequencies while maintaining consistent control architecture.
Replacement Considerations
Publicly confirmed substitute part numbers are not available in the provided documentation. Users should consult official Microchip Technology or Microsemi cross-reference guides for compatible alternatives. Verify pinout compatibility and electrical parameter overlaps before substituting any component in existing designs.
