GENERAL DESCRIPTION
The PW2558 develops a high efficiency asynchronous step down DC/DC regulator capable of
delivering 0.8A output current. The IC adopts current mode adaptive constant off time control. The
PW2558 operates over a wide input voltage range from 4.5V to 55V and integrates main switch with
very low RDS(ON) to minimize the conduction loss. Low output voltage ripple and small external
inductor and capacitor sizes are achieved with 1.2MHz switching frequency.
FEATURES
⚫ Low RDS(ON) for Internal N-channel Power FET:700mΩ
⚫ 4.5V-55V Input Voltage Range
⚫ 0.8A Output Current Capability
⚫ 1.2MHz Pseudo Constant Switching Frequency
⚫ Internal Soft-start Limits the Inrush Current
⚫ Hic-cup Mode Output Short Circuit Protection
⚫ EN ON/OFF Control with Accurate Threshold
⚫ Cycle by Cycle Peak Current Limit
⚫ 0.6V±1 % Reference Voltage
⚫ SOT23-6 Package
APPLICATIONS
⚫ Non-Isolated Telecommunication Buck Regulator
⚫ Secondary High Voltage Post Regulator
⚫ Automotive Systems
TYPICAL APPLICATION CIRCUIT
品牌代理商：深圳市夸克微科技
郑生： 13528458039
QQ ： 2867714804
