1.5MHz, 600mA, High Efficiency PWM Step-Down Converter


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The RT8099 is a Pulse-Width-Modulated (PWM) DC/DC step-down converter, and is capable of delivering 0.6A output current over a wide input voltage range from 2.7V to 5.5V. The RT8099 is ideally suited for portable electronic devices that are powered from 1-cell Li-ion battery such as cellular phones, PDAs and handy-terminals. Internal synchronous rectifier with low RDS(ON) dramatically reduces conduction loss at PWM mode. No external schottky barrier diode is required in practical application.

The RT8099 enters low-dropout mode when normal PWM cannot provide regulated output voltage by continuously turning on the high-side P-MOSFET. The RT8099 enters shut-down mode and consumes less than 0.1μA when the EN pin is pulled low. The switching ripple is easily smoothed-out by small package filtering elements due to 1.5MHz high switching frequency. Other features include soft-start, auto discharge, lower internal reference voltage, over-temperature protection, and over-current protection.

The RT8099 is available in the small UDFN-6L 1.6x1.6 package for saving PCB space.


  • Cellular Telephones
  • Personal Information Appliances
  • Wireless and DSL Modems
  • MP3 Players
  • Portable Instruments
Key Spec.
Status Active
Vin (min) (V) 2.7
Vin (max) (V) 5.5
Number of Outputs 1
Vout (min) (V) 0.7
Vout (max) (V) 5
Output Adj. Method Resistor
Iout (max) (A) 0.6
Current Limit (typ) (A) 1.5
Freq (typ) (kHz) 1500
Ext Sync No
Ron_HS (typ) (mOhm) 280
Ron_LS (typ) (mOhm) 250
Iq (typ) (mA) 0.02
Features 100% Duty Cycle;Cycle-by-Cycle Current Limit;Enable Input;OCP;PSM;UVP
Package Type UDFN1.6x1.6-6
  • 2.7V to 5.5V Input Range
  • Adjustable Output from 0.7V to 5V
  • 0.6A Output Current
  • 95% Efficiency
  • No Schottky Barrier Diode Required
  • 1.5MHz Spread Spectrum Frequency PWM Operation
  • Auto Discharge Function
  • Over-Current Protection
  • Overt-Temperature Protection
  • Integrated Soft-Start Function
  • Small 6-Lead UDFN Package
  • RoHS Compliant and Halogen Free
TitleLast UpdateShareDownload
1.5MHz, 600mA, High Efficiency PWM Step-Down Converter2013/04/03
Technical Documents
TitleLast UpdateShareDownload
Richtek Selection Guide [Oct., 2020]2020/12/30
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT8099GQUUDFN1.6x1.6-62500 Not available Buy from Distributor