Synchronous Boost Converter with Voltage Detector
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.
z True Load Disconnection During Shutdown
z Internal Synchronous Rectifier
z Up to 96% Efficiency
z Current Mode PWM Operation with Internal
z Low Start-Up Voltage
z Low Quiescent Current
z Internal Soft-Start Control
z Low Battery Comparator
z Low EMI Converter (Anti-Ringing)
z Power Save Mode for Improved Efficiency at Light
z Over Current Protection
z Short Circuit Protection
z Over Temperature Protection
z Over Voltage Protection
z Small WDFN-10L 3x3 Package
z RoHS Compliant and Halogen Free
QW : WDFN-10L 3x3 (W-Type)
z All One-Cell, Two-Cell and Three-Cell Alkaline, NiCd,
NiMH and Single-Cell Li Batteries
z Hand-Held Devices
z WLED Flash Light
Lead Plating System
G : Green (Halogen Free and Pb Free)
Default : Adjustable
33 : 3.3V
50 : 5.0V
11 6 VBAT
Richtek products are :
` RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
EW= : Product Code
YMDNN : Date Code
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS9276-02 July 2013
is a registered trademark of Richtek Technology Corporation.