1.5MHz, 1A, High Efficiency PWM Step-Down DC/DC Converter


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The RT8080 is a high efficiency Pulse-Width-Modulated (PWM) step-down DC/DC converter. Capable of delivering 1A output current over a wide input voltage range from 2.8V to 5.5V, the RT8080 is ideally suited for portable electronic devices that are powered from 1-cell Li-ion battery or from other power sources such as cellular phones, PDAs and hand-held devices.

Two operating modes are available including : PWM/Low-Dropout auto switch and shutdown modes. The Internal synchronous rectifier with low RDS(ON) dramatically reduces conduction loss at PWM mode. No external Schottky diode is required in practical application.

The RT8080 enters Low Dropout mode when normal PWM cannot provide regulated output voltage by continuously turning on the upper P-MOSFET. When EN pin is pulled low, the RT8080 will enter shutdown mode and consume less than 0.1μA.

The switching ripple is easily smoothed-out by small package filtering elements due to a fixed operating frequency of 1.5MHz. This along with small WDFN-6L 2x2 package provides small PCB area application. Other features include soft start, lower internal reference voltage with 2% accuracy, over temperature protection, and over current protection.


  • Mobile Phones
  • Personal Information Appliances
  • Wireless and DSL Modems
  • MP3 Players
  • Portable Instruments
Key Spec.
Status Active
Vin (min) (V) 2.8
Vin (max) (V) 5.5
Number of Outputs 1
Vout (min) (V) 0.6
Vout (max) (V) 5.5
Output Adj. Method Resistor
Iout (max) (A) 1
Current Limit (typ) (A) 1.5
Freq (typ) (kHz) 1500
Ext Sync No
Ron_HS (typ) (mOhm) 250
Ron_LS (typ) (mOhm) 250
Iq (typ) (mA) 0.078
Features Current Mode Control;Enable Input;Force PWM;Internal Compensation;OCP;OTP;Stable with Ceramic Capacitor
Package Type WDFN2x2-6
  • 2.8V to 5.5V Input Range
  • Adjustable Output From 0.6V to VIN
  • 1A Output Current
  • 95% Efficiency
  • No Schottky Diode Required
  • 1.5MHz Fixed-Frequency PWM Operation
  • Small 6-Lead WDFN Package
  • RoHS Compliant and Halogen Free
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1.5MHz, 1A, High Efficiency PWM Step-Down DC/DC Converter2012/05/03
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