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RT8256

Richtek
Part Number RT8256
Manufacturer Richtek
Description 400kHz Step-Down Converter
Published Jan 28, 2013
Detailed Description RT8256 2A, 22V, 400kHz Step-Down Converter General Description The RT8256 is an as high voltage buck converter that can ...
Datasheet PDF File RT8256 PDF File

RT8256
RT8256

Overview
RT8256 2A, 22V, 400kHz Step-Down Converter General Description 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-bycycle current limiting and thermal shutdown protection.
In shutdown mode, the regulator draws 25uA of supply current.
The RT8256 is available in a SOP-8 surface mount package.
Features z z z z z z z z z z z Wide Operating Input Range : 4.
75V to 22V Adjustable Output Voltage Range : 1.
22V to 16V Output Current up to 2A 25uA 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 Ordering Information RT8256 Package Type S : SOP-8 Lead Plating System G : Green (Halogen Free and Pb Free) Note : Richtek products are : ` Applications z z z z Distributive Power Systems Battery Charger DSL Modems Pre-regulator for Linear Regulators Pin Configurations http://www.
DataSheet4U.
net/ RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.
NC BOOT VIN SW (TOP VIEW) 8 2 3 4 7 6 5 EN COMP FB GND ` Suitable for use in SnPb or Pb-free soldering processes.
SOP-8 Typical Application Circuit VIN 4.
75V to 22V 3 CIN 10µF 8 EN FB 6 5 GND COMP 7 VIN BOOT RT8256 SW 4 2 CB 10nF D1 B230 RC CC 10k 1.
5nF L1 15µH R1 17k R2 10k VOUT 3.
3V/2A COUT 22µF Chip Enable CP NC DS8256-01 March 2011 www.
richtek.
com 1 datasheet pdf - http://www.
DataSheet4U.
net/ RT8256 Table 1.
Recommended Component Selection VOUT (V) 12 5 3.
3 2.
5 1.
8 1.
222 R1 (kΩ) 88.
7 30 17 10.
45 4.
75 0 R2 (kΩ) 10 10 10 10 10 10 RC (kΩ) 62 20 10 7.
5 6 6 CC (nF) 0.
82 2.
2 1.
5 1.
5 1.
5 3.
9 L1 (μH) 33 22 15 10 10 6.
8 C OUT (μF) 22 22 22 22 22 22 Functional Pin Descripti...


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