RT8256

2A, 22V, 400kHz Step-Down Converter

The RT8256 is an as high voltage buck converter that can support the input voltage range from 4.75V to 22V and the output current can be up to 2A. 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 draws 25μA of supply current. The RT8256 is available in a SOP-8 surface mount package.

Applications

Distributive Power Systems
Battery Charger
DSL Modems
Pre-regulator for Linear Regulators

Key Spec.
	RT8256
Status	Active
Vin (min) (V)	4.75
Vin (max) (V)	22
Number of Outputs	1
Vout (min) (V)	1.22
Vout (max) (V)	16
Output Adj. Method	Resistor
Iout (max) (A)	2
Current Limit (typ) (A)	2.7
Freq (typ) (kHz)	400
Freq (min) (kHz)	340
Freq (max) (kHz)	460
Ext Sync	No
Ron_HS (typ) (mOhm)	180
Iq (typ) (mA)	0.7
Features	Current Mode Control;Cycle-by-Cycle Current Limit;Enable Input;Force PWM;OCP;OTP;Stable with Ceramic Capacitor;UVP
Package Type	SOP-8

Features

Wide Operating Input Range : 4.75V to 22V
Adjustable Output Voltage Range : 1.22V to 16V
Output Current up to 2A
25μA Low Shutdown Current
Power MOSFET : 0.18Ω
High Efficiency up to 95%
400kHz Fixed Switching Frequency
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
2A, 22V, 400kHz Step-Down Converter	2015/04/29

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.