1MHz, 2A, High Efficiency PWM Step-Down DC/DC Converter


Update Alert Share

The RT8058 is a current mode PWM step-down converter. The chip is ideal for fixed frequency and low ripple applications over full range of load conditions. Its input voltage range is from 2.6V to 5.5V with a constant 1MHz switching frequency that allows it to adopt tiny, low cost capacitors and inductors with 2mm or less in height making it ideal for single-cell Li-lon/polymer battery applications. The low on resistance internal MOSFET can achieve high efficiency without the need of external schottky diodes in wide operating ranges and the output voltage is adjustable from 0.6V to 5V that can provide up to 2A load current. The RT8058 operates at 100% duty cycle for low dropout operation that extends battery life in portable devices.
The RT8058 is available in a WQFN-16L 3x3 package.


Key Spec.
Status Active
Vin (min) (V) 2.6
Vin (max) (V) 5.5
Number of Outputs 1
Vout (min) (V) 0.6
Vout (max) (V) 5
Output Adj. Method Resistor
Iout (max) (A) 2
Current Limit (typ) (A) 3
Freq (typ) (kHz) 1000
Ext Sync No
Ron_HS (typ) (mOhm) 142
Ron_LS (typ) (mOhm) 96
Iq (typ) (mA) 0.34
Features 100% Duty Cycle;Current Mode Control;Enable Input;Force PWM;Internal Compensation;OCP;Stable with Ceramic Capacitor;UVP
Package Type WQFN3x3-16
  • 0.6V Reference Allows Low Output Voltage
  • Low Dropout Operation : 100% Duty Cycle
  • 2A Load Current
  • < 2μA Shutdown Current
  • Up to 95% Efficiency
  • No Schottky Diode Required
  • 1MHZ Constant Switching Frequency
  • Low RDS(ON) Internal Switches
  • Internally Compensated
  • Internal Soft-Start
  • Over temperature Protection
  • Short Circuit Protection
  • Small 16-Lead WQFN Package
  • RoHS Compliant and 100% Lead (Pb)-Free
TitleLast UpdateShareDownload
1MHz, 2A, High Efficiency PWM Step-Down DC/DC Converter2015/04/29
Title Last Update ShareDownload
1MHz, 2A, High Efficiency PWM Step-Down DC/DC Converter 2015/05/19
Technical Documents
TitleLast UpdateShareDownload
Richtek Selection Guide [Oct., 2020]2020/12/30
TitleLast UpdateShareViews
How to estimate control loop bandwidth from the transient response time?2017/03/30 1379
Reference Design
TitleLast UpdateShareDownload
Richtek Load Transient Tool2021/01/21