High Performance, Low Noise Boost Converter


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The RT9277A/B is a high performance, low noise, fixed frequency step up DC-DC Converter. The RT9277A/B converters input voltage ranging 2.5V to 5.5V into output voltage up to 16V. Current mode control with external compensation network makes it easy to stabilize the system and keep maximum flexibility. Soft start function minimizes impact on the input power system. Internal power MOSFET with very low RDS(ON) provides high efficiency. The RT9277A/B automatically transits from PWM to PSM (Pulse Skipping Mode) during light load condition further increasing efficiency. 640kHz and 1.2MHz operation frequency options provide flexibiltity of minimum output inductor size, maximum efficiency and low BOM cost.

The RT9277A/B also provides comprehensive protection functions such as UVLO, OCP and OTP.


  • TFT LCD panel
  • OLED Display
  • PCMCIA Cards
  • Portable Device
Key Spec.
RT9277A RT9277B
Status Active Active
Vin (min) (V) 2.5 2.5
Vin (max) (V) 5.5 5.5
Vout (min) (V) 3 3
Vout (max) (V) 16 16
Output Adj. Method Resistor Resistor
Iq (typ) (mA) 2 2
SW Current Limit (typ) (A) 1.6 1.6
Freq (typ) (kHz) 1200;640 1200;640
Freq (min) (kHz) 640 640
Freq (max) (kHz) 1200 1200
Ron (typ) (Ohm) 0.2 0.2
Features Adjustable Soft-Start;Enable Input;OCP;OVP;SCP Adjustable Soft-Start;Enable Input;OCP;OVP;SCP
Package Type MSOP-8 MSOP-8
  • 90% Efficiency
  • VIN Operating Range : 2.5V to 5.5V
  • 1.6A, 0.2Ω, 16V Internal Power MOSFET
  • 640kHz and 1.2MHz Operation Frequency
  • External Compensation Network
  • Internal/External Programmable Soft Start Function
  • Small MSOP8 Package
  • OCP and OTP Function are Included
  • RoHS Compliant and 100% Lead (Pb)-Free
TitleLast UpdateShareDownload
High Performance, Low Noise Boost Converter2006/05/12
Technical Documents
TitleLast UpdateShareDownload
Power Mangement Components for Lithium-Ion Battery Powered Applications2020/12/30
Richtek Selection Guide [Oct., 2020]2020/12/30
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT9277BGFMSOP-82500 Not available Buy from Distributor