4A, 2MHz, Synchronous Step-Down Converter


Update Alert Share

The RT8070 is a high efficiency synchronous, step-down DC/DC converter. Its input voltage range is from 2.7V to 5.5V and provides an adjustable regulated output voltage from 0.8V to 5V while delivering up to 4A of output current.

The internal synchronous low on-resistance power switches increase efficiency and eliminate the need for an external Schottky diode. The default switching frequency is set at 2MHz, if the RT pin is left open. It can also be varied from 200kHz to 2MHz by adding an external resistor. Current mode operation with external compensation allows the transient response to be optimized over a wide range of loads and output capacitors.


  • LCD TV and Monitor
  • Notebook Computers
  • Distributed Power Systems
  • IP Phones
  • Digital Cameras
Key Spec.
Status Active
Vin (min) (V) 2.7
Vin (max) (V) 5.5
Number of Outputs 1
Vout (min) (V) 0.8
Vout (max) (V) 5
Output Adj. Method Resistor
Iout (max) (A) 4
Current Limit (typ) (A) 5.8
Freq (typ) (kHz) 1000
Freq (min) (kHz) 200
Freq (max) (kHz) 2000
Ext Sync No
Ron_HS (typ) (mOhm) 110
Ron_LS (typ) (mOhm) 70
Iq (typ) (mA) 0.46
Features 100% Duty Cycle;Adjustable Frequency;Adjustable Soft-Start;Current Mode Control;Enable Input;Fast Transient Response;OCP;PSM;Power Good;Stable with Ceramic Capacitor;UVP
Package Type PSOP-8;WDFN3x3-8
  • High Efficiency : Up to 95%
  • Adjustable Frequency : 200kHz to 2MHz
  • No Schottky Diode Required
  • 0.8V Reference Allows Low Output Voltage
  • Low Dropout Operation : 100% Duty Cycle
  • Enable Function
  • External Soft-Start
  • Power Good Function
  • RoHS Compliant and Halogen Free
TitleLast UpdateShareDownload
4A, 2MHz, Synchronous Step-Down Converter2010/12/02
Title Last Update ShareDownload
4A, 2MHz, Synchronous Step-Down Converter 2015/05/19
TitleLast UpdateShareViews
How to estimate control loop bandwidth from the transient response time?2017/03/30 666
Reference Design
TitleLast UpdateShareDownload
Richtek Load Transient Tool2019/01/09
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT8070ZQWWDFN3x3-81500 Not available Buy from Distributor
RT8070ZSPPSOP-82500 Request Buy from Distributor