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  Richtek Technology Electronic Components Datasheet  

RT9276 Datasheet

Synchronous Boost Converter

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®
RT9276
Synchronous Boost Converter with Voltage Detector
General Description
Features
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
Compensation
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
Load Current
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
Applications
Ordering Information
RT9276(- )
Package Type
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
Note :
Lead Plating System
G : Green (Halogen Free and Pb Free)
Boost VOUT
Default : Adjustable
33 : 3.3V
50 : 5.0V
Pin Configurations
(TOP VIEW)
EN 1
VOUT 2
FB/NC 3
LBO 4
GND 5
10 PGND
9 LX
8 PGOOD
7 LBI
11 6 VBAT
Richtek products are :
WDFN-10L 3x3
` 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.
Marking Information
EW= : Product Code
EW=YM
DNN
YMDNN : Date Code
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS9276-02 July 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT9276 Datasheet

Synchronous Boost Converter

No Preview Available !

RT9276
Typical Application Circuit
VBAT
L
CIN
R1
R2
Chip Enable
RT9276
9 LX
6 VBAT
VOUT 2
7 LBI
10 PGND
FB 3
LBO 4
PGOOD 8
R3
R4
COUT
1 EN
GND 5, Exposed Pad (11)
R5
VOUT
R6
LBO
PGOOD
Figure 1. Adjustable Output Voltage Boost Converter with Voltage Detector
VBAT
L
CIN
R1
R2
Chip Enable
RT9276
9 LX
6 VBAT
VOUT 2
7 LBI
10 PGND
LBO 4
PGOOD 8
NC 3
R3 COUT
1 EN
GND 5, Exposed Pad (11)
R4
VOUT
PGOOD
Figure 2. Fixed Output Voltage Boost Converter with Voltage Detector
Functional Pin Description
Pin No.
Pin Name
Pin Function
1 EN
Chip Enable (Active High).
2
VOUT
Boost Output.
Feedback Input for Adjustable Output Voltage Version / No Internal Connection
3 FB / NC
for Fixed Output Voltage Version.
4
LBO
Voltage Detector Output.
5
GND
Ground.
6
VBAT
Battery Supply Input.
7 LBI Voltage Detector Input.
8 PGOOD Power Good Indicator.
9 LX
Switching Node. Connect this pin to an inductor.
10 PGND
11 (Exposed Pad) GND
Power Ground.
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS9276-02 July 2013


Part Number RT9276
Description Synchronous Boost Converter
Maker Richtek
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RT9276 Datasheet PDF






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