# Si9150 Synchronous Buck Converter Controller

## Features
· Input Voltage Range: 6- to 16.5-V (Si9150CY)
· Control Type: Voltage-Mode PWM
· Low-Current Standby Mode
· Enable Control
· Output Drivers: Dual 100-mA
· Reference: 2% Band Gap
· Synchronization: Multiple converters can be synchronized
· Protection: Over-current

## Description
· Designed for high-efficiency step-down converters in battery-powered equipment.
· Can implement a 90% efficient, 7.5-W, 3.3-V or 5-V power supply with Si9943DY MOSFET.
· Wide input range for 6-10 cell NiCd/NiMH battery packs.
· Over-current protection via sensing voltage drop across high-side p-channel MOSFET.
· Duty ratios: 0-100%
· Switching frequencies: Up to 300 kHz.
· Temperature Range: 0 to 70°C (C suffix) or -40 to +85°C (D suffix).

## Absolute Maximum Ratings
· VDD: 18V
· ISENSE Input: -2V to VDD + 2V
· Other Inputs: -0.3 to VDD + 0.3V
· P/N-Gate Current: 50mA
· Storage Temperature: -65 to 125°C
· Operating Junction Temperature: 150°C

## Key Specifications (Example - see datasheet for full range)
· Reference Output Voltage: 2.5V
· Maximum Frequency: 300 kHz
· Supply Current (Enable Low): 100 µA
· Supply Current (Enable High): 3.0 mA

## Pin Descriptions (Selected)
· EN (Enable): Shuts down IC when low.
· STBY (Standby): Disables functions while maintaining reference voltage.
· SS (Soft-Start): Limits the duty cycle increase during startup.
· COMP (Compensation): Output of the error amplifier.
· FB (Feedback): Regulates output voltage.
· ISENSE: Senses the voltage drop to implement current limit.
· SYNC: Synchronizes multiple controllers.
· VDD: Power supply input.