The RT9276 is a synchronous boost converter, which is based on a fixed frequency Pulse-Width-Modulation (PWM) controller using a synchronous rectifier to obtain maximum efficiency. The converter provides a power supply solution for products powered by a variety of batteries such as single cell, dual cell alkaline, NiMH and NiCd battery. At light load currents, the converter enters power save mode to maintain a high efficiency over a wide load current range.
The output voltage can be programmed by an external resistor divider, or fixed at a certain voltage. Moreover, the converter can be disabled to minimize battery drain. During shutdown, the load is completely disconnected from the battery. The maximum peak current in the boost switch is limited to 2A for current limit.
For the RT9276, a low-EMI mode is implemented to reduce ringing of the inductor phase pin when the converter enters discontinuous conduction mode. Moreover, a voltage detector is built-in in the chip for low battery detection.


  • All One-Cell, Two-Cell and Three-Cell Alkaline, NiCd, NiMH and Single-Cell Li Batteries
  • Hand-Held Devices
  • WLED Flash Light
Key Spec.
Status Active
Vin (min) (V) 1.2
Vin (max) (V) 5
Vout (min) (V) 3.3
Vout (max) (V) 5
Output Adj. Method Fixed;Resistor
Iq (typ) (mA) 0.1
SW Current Limit (typ) (A) 2
Freq (typ) (kHz) 1200
Freq (min) (kHz) 960
Freq (max) (kHz) 1440
Ron (typ) (Ohm) 0.24
Features Enable Input;OCP;OVP;SCP
Package Type WDFN3x3-10
  • True Load Disconnection During Shutdown
  • Internal Synchronous Rectifier
  • Up to 96% Efficiency
  • Current Mode PWM Operation with Internal Compensation
  • Low Start-Up Voltage
  • Low Quiescent Current
  • Internal Soft-Start Control
  • Low Battery Comparator
  • Low EMI Converter (Anti-Ringing)
  • Power Save Mode for Improved Efficiency at Light Load Current
  • Over Current Protection
  • Short Circuit Protection
  • Over Temperature Protection
  • Over Voltage Protection
  • Small WDFN-10L 3x3 Package
  • RoHS Compliant and Halogen Free
TitleLast UpdateDownload
Synchronous Boost Converter with Voltage Detector2011/10/05
Additional Documents
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Power Management Components for Lithium-Ion Battery Powered Applications
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT9276GQWWDFN3x3-101500 Request Buy from Distributor