SY8113B-18V3A同步降压芯片.pdf

Application Note: SY8113B High Efficiency, 500kHz, 3A, 18V Input Synchronous Step Down Regulator General Description Features The SY8113B is a high efficiency 500 kHz • low RDS(ON) for internal switches (top/bottom): synchronous step-down DC-DC converter capable of 80mΩ/40mΩ delivering 3A current. The SY8113B operates over a • 4.5-18V input voltage range wide input voltage range from 4.5V to 18V and • 3A output current capability integrates main switch and synchronous switch with • 500 kHz switching frequency very low RDS(ON) to minimize the conduction loss. • Instant PWM architecture to achieve fast transient responses. Low output voltage ripple and small external inductor • Cycle-by-cycle peak current limitation and capacitor sizes are achieved with 500 kHz • Internal softstart limits the inrush current switching frequency. It adopts the instant PWM • ±1.5% 0.6V reference architecture to achieve fast transient responses for high step down applications • TSOT23-6 package Ordering Information Applications SY8113 ( ) □□ □□□□ □□ □□ □□□□ □□ Temperature Code • Set Top Box Package Code • Portable TV Optional Spec Code • Access Point Router Temperature Range: -40°C to 85°C • DSL Modem