FEATURES：

 

• Wide Input Voltage Range: 3.1V-50V
• Low Shutdown Current 3.9uA
• Low Quiescent Operating Current: 415uA
• +/- 1.5% Feedback Reference Voltage
• Adjustable Switching Frequency: 100KHz to 2.2MHz
• Integrated Frequency Dither for EMI Mitigation
• External Frequency Synchronic
• External Compensation
• Pulse Skipping Mode
• Supports additional Slope Compensation
• 14ms Internal Soft-start Time
• Integrated Protection Feature
- Constant Peak-Current Protection Threshold Over Input Voltage 
- Output Overvoltage Protection
- Adjustable Under-voltage Lockout
- Hiccup Over Load Protection
- Thermal Shutdown Protection:165°C
• MSOP-10L(3mm*3mm) 

 

 

DESCRIPTION：

 

The SCT81621 device is a wide input, non-synchronous boost controller. The device can be used in Boost, SEPIC and Flyback converters. 
The switching frequency of the SCT81621 device can be adjusted to any value between 100kHz and 2.2MHz by using a single external resistor or by synchronizing it to an external clock. Current mode control provides superior bandwidth and transient response in addition to cycle-by-cycle current limiting. Current limit is adjustable through an external resistor. 
The SCT81621 is an Electromagnetic Interference (EMI) friendly controller with implementing optimized design for EMI reduction.  The SCT81621 features Frequency Spread Spectrum (FSS) with ±6% jittering span of the switching frequency and modulation rate 1/512 of switching frequency to reduce the conducted EMI.
The SCT81621 device has built-in protection features such as thermal shutdown, short-circuit protection and overvoltage protection. Power-saving shutdown mode reduces the total supply current to 3.9 µA. Integrated current slope compensation simplifies the design and, if needed for specific applications, can be increased using a single resistor. 
The device is available in a MSOP-10L(3mm*3mm) Package.

 

 

APPLICATIONS：