RT8280H

3A, 24V, 3MHz Step-Down Converter

The RT8280H is a high voltage buck converter that can support an input voltage range from 4.5V to 24V with output current up to 3A. Current mode operation provides fast transient response and eases loop stabilization.The chip provides protection functions such as cycle-by-cycle current limiting and thermal shutdown protection. In shutdown mode, the regulator only draws 25μA of supply current. The RT8280H is available in a SOP-8 (Exposed Pad) package.

Applications

DSL Modem for ADSL2+ Standard
Distributed Power Systems
Pre-Regulator for Linear Regulators

Key Spec.
	RT8280H
Status	Active
Vin (min) (V)	4.5
Vin (max) (V)	24
Number of Outputs	1
Vout (min) (V)	0.8
Vout (max) (V)	15
Output Adj. Method	Resistor
Iout (max) (A)	3
Current Limit (typ) (A)	5
Freq (typ) (kHz)	2200
Freq (min) (kHz)	220
Freq (max) (kHz)	3000
Ext Sync	No
Ron_HS (typ) (mOhm)	110
Iq (typ) (mA)	0.8
Features	Adjustable Frequency;Current Mode Control;Enable Input;OCP;OTP;PSM;Stable with Ceramic Capacitor;UVP
Package Type	PSOP-8

Features

Wide Operating Input Range : 4.5V to 24V
Adjustable Output Voltage Range : 0.8V to 15V
Output Current up to 3A
25μA Low Shutdown Current
High Efficiency up to 90% at 2.2MHz
Programmable Frequency : 220kHz to 3MHz
Internal Soft-Start
Stable with Low ESR Output Ceramic Capacitors
Thermal Shutdown Protection
Cycle-By-Cycle Over Current Protection
RoHS Compliant and Halogen Free

Datasheet
Title	Last Update	Download
3A, 24V, 3MHz Step-Down Converter	2011/12/09

Videos
Title	Last Update	Views
How to estimate control loop bandwidth from the transient response time?	2017/03/30	2389

Reference Design
Title	Last Update	Download
Richtek Load Transient Tool	2022/07/25

Please confirm with our distributor or sales representative for actual stock status.