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频率
(kHz)

Features

•  Wide input voltage range of 5V to 100V

•  Junction temperature range: –40°C to +150°C

•  Fixed 3-ms internal soft-start timer

•  Peak current-limit protection

•  EN UVLO and thermal shutdown protection

•  Low minimum on- and off-times of 100ns/200ns

•  Adjustable switching frequency up to 500kHz

•  5-μA shutdown quiescent current CC

•  COT mode control architecture

•  Integrated 0.325-Ω NFET buck switch supports wide duty-cycle range

•  1.2-V internal voltage reference

•  No loop compensation components

•  Internal VCC bias regulator and boot diode

•  Open-drain power good indicator

•  8-Pin SOIC package with PowerPAD™

Description

The LYF89023 buck converter is designed to

regulate over a wide input voltage range, minimizing

the need for external surge suppression components.

A minimum controllable on-time of 100 ns facilitates

large step-down conversion ratios, enabling the direct

step-down from a 48-V nominal input to low-voltage

rails for reduced system complexity and solution cost.

The LYF89023 operates during input voltage dips as

low as 5V, at nearly 100% duty cycle if needed,

making it an excellent choice for wide input supply

range industrial and high cell count battery pack

applications.

With integrated high-side power MOSFET, the

LYF89023 delivers up to 3.0-A of output current. A

constant on-time (COT) control architecture provides

nearly constant switching frequency with excellent

load and line transient response. Additional features

of the LYF89023 include ultra-low IQ , operation for

high light-load efficiency, innovative peak over

current protection, integrated VCC bias supply and

bootstrap diode, precision enable and thermal

shutdown protection with automatic recovery. An

open-drain PGOOD indicator provides sequencing,

fault reporting, and output voltage monitoring.