SI-8511NVS |Sanken Electric



Data Sheetdownload (PDF:56.72KB)
Application Notedownload (PDF:424.50KB)


SI-8511NVS series chopper type switching regulator control IC provides various features and protection functions required for a synchronized rectification step-down chopper regulator.
The synchronized rectification type switching regulator with high precision and high efficiency can be composed by connecting external logic Nch-MOS FET, diode etc.


・Power supply for laptop PC・cellular phones
・On-board local power supply
・OA equipment
・For stabilization of the secondary-side output voltage of switching power supplies


・Surface-mount package(TSSOP24)
・High efficiency due to synchronous rectification: 92% (at VIN = 5V, IO = 1A, VO = 2.5V)
・Capable of downsize a choke-coil due to IC's high switching frequency (400kHz typ, On Time Control). (Compared with conventional Sanken devices)
・Low reference voltage (Vref) of 1.1V. The output voltage is variable from 1.1V to 6V.
・High-speed response to a load
・Compatible with low ESR capacitors
・Soft start and output ON/OFF available
・Built-in overcurrent and output-overvoltage protection circuits
・PWRGD function to indicate the output voltage status
・High precision reference voltage: 1.1V ± 1.2%



Package Name:TSSOP24

Package Diagram

Design Support


Built-in PowerNO
Output Voltage1.1V to 6V
Output Current
Input Voltage Range3V to 18V
Operating Frequency400kHz
Current Mode ControlNO
Maximum Input Voltage18V
Minimum Input Voltage3V
Output on/offYES
Low ESR Capacitor SupportNO
Overcurrent ProtectionDrooping Type
Phase CompensationBuilt-in
Thermal ProtectionYES

Representative Circuit

Internal Block Diagram

Pin-Out Diagrams

Data Sheetdownload (PDF:56.72KB)
Application Notedownload (PDF:424.50KB)
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