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  Richtek Technology Electronic Components Datasheet  

RT9296 Datasheet

Synchronous Boost Converter

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RT9296
Synchronous Boost Converter with LDO Controller
General Description
Features
The RT9296 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 the 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 be a fixed voltage. Moreover, the
converter can be disabled to the 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 RT9296, a low-EMI (anti-ringing) mode is
implemented (by trim option) to reduce ringing of the
inductor phase pin when the converter enters the
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 Linear Controller
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 10-Lead WDFN Package
z RoHS Compliant and Halogen Free
discontinuous conduction mode. Moreover, a linear
controller is built-in in the chip for linear regulator
application.
Applications
z All One-Cell, Two-Cell and Three-Cell Alkaline, NiCd,
NiMH and Single-Cell Li Batteries
Ordering Information
RT9296(- )
z Hand-Held Devices
z WLED Flash Light
Package Type
QW : WDFN-10L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
Boost VOUT
Default : Adjustable
33 : 3.3V
50 : 5.0V
Richtek products are :
Pin Configurations
(TOP VIEW)
EN 1
VOUT 2
FB/NC 3
DRV 4
GND 5
10 PGND
9 LX
8 PGOOD
7 FBL
11 6 VBAT
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
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
DS9296-01 April 2011
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT9296 Datasheet

Synchronous Boost Converter

No Preview Available !

RT9296
Typical Application Circuit
VBAT
VOUT
L
4.7µH
CIN
10µF
R4
RT9296
9 LX
VOUT 2
6 VBAT
8 PGOOD
DRV 4
VOUT
R1 COUT
22µF
Q1
LDO
Chip Enable
1 EN
5, Exposed Pad (11) GND
FBL 7
PGND 10
R2 CLDO
R3
Figure 1. Fixed Output Voltage Boost Converter with Linear Regulator
VBAT
VOUT
Chip Enable
L
4.7µH
CIN
10µF
R5
RT9296
9 LX
VOUT 2
6 VBAT
8 PGOOD
FB 3
DRV 4
1 EN
PGND 10
5, Exposed Pad (11) GND
FBL 7
R1
R2
COUT
22µF
R3
VOUT
Q1
WLED
R4
Figure 2. Adjustable Output Voltage Boost Converter with WLEDDriver
Functional Pin Description
Pin No.
Pin Name
Pin Function
1 EN Chip Enable (Active High).
2
VOUT
Boost Output.
3 FB / NC Feedback Pin / No Internal Connection.
4
DRV
Driver of Linear Controller.
5
GND
Ground.
6
VBAT
Battery Supply Input.
7 FBL Feedback Input Linear Controller.
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.
www.richtek.com
2
DS9296-01 April 2011


Part Number RT9296
Description Synchronous Boost Converter
Maker Richtek Technology
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RT9296 Datasheet PDF






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