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  Richtek Technology Electronic Components Datasheet  

RT9297 Datasheet

3A High Performance Step-Up DC/DC Converter

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®
RT9297
3A High Performance Step-Up DC/DC Converter
General Description
The RT9297 includes a high performance step-up DC/DC
converter that provides a regulated supply voltage for active-
matrix thin-film transistor (TFT) liquid-crystal displays
(LCDs).
The Boost Converter incorporates current mode, fixed-
frequency, pulse-width modulation (PWM) circuitry with
a built-in N-Channel power MOSFET to achieve high
efficiency and fast transient response.
The RT9297 is available in a WDFN -10L 3x3 package.
Ordering Information
RT9297
Package Type
QW : WDFN-10L 3x3 (W-Type)
Note :
Lead Plating System
G : Green (Halogen Free and Pb Free)
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.
Marking Information
EZ= : Product Code
EZ=YM
DNN
YMDNN : Date Code
Features
z High Efficiency Up to 90%
z Adjustable Output Voltage : VDD to 24V
z Wide Input Supply Voltage : 2.6V to 5.5V
z Input Under Voltage Lockout
z Pin-Programmable Switching Frequency 640kHz/
1.2MHz
z Programmable Soft-Start
z Small 10-Lead WDFN Package
z RoHS Compliant and Halogen Free
Applications
z Notebook Computer Displays
z LCD Monitor Panels
z LCD TV Panels
Pin Configurations
(TOP VIEW)
COMP 1
FB 2
EN 3
GND 4
GND 5
10 SS
9 FREQ
8 VDD
7 LX
11 6 LX
WDFN-10L 3x3
Typical Application Circuit
VDD
2.6V to 5.5V
C1
R3
C3
L1 D1
RT9297
8 VDD
LX 6, 7
9 FREQ
3 EN
1 COMP
GND
FB 2
SS 10 CSS
4, 5,
11 (Exposed Pad)
R1
R2
VAVDD
C2
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS9297-02 June 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT9297 Datasheet

3A High Performance Step-Up DC/DC Converter

No Preview Available !

RT9297
Function Block Diagram
EN
COMP
FB
FREQ
LX
VIN
VFB
Protection
Soft-
Start
4µA
1.24V
Error
Amplifier
-
+
Summing
Comparator
-
+
Clock
Control
and
Driver
Logic
Oscillator
4µA
Slope
Compen-
sation
Current
Sense
VDD
SS
LX
GND
Functional Pin Description
Pin No.
1
2
Pin Name
COMP
FB
Pin Function
Compensation Pin for Error Amplifier. Connect a series RC from COMP to
ground.
Feedback. The feedback regulation voltage is 1.24V nominal. Connect an
external resistive voltage-divider between the step-up regulator’s output (VAVDD)
and GND, with the center tap connected to FB. Place the divider close to the IC
and minimize the trace area to reduce noise coupling.
3
4, 5
11 (Exposed Pad)
EN
GND
6, 7 LX
8 VDD
9 FREQ
Enable Control Input. Drive EN low to turn off the Boost Converter.
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
Switch. LX is the drain of the internal MOSFET. Connect the inductor/rectifier
diode junction to LX and minimize the trace area for lower EMI.
Supply Pin. Bypass VDD with a minimum 1μF ceramic capacitor directly to GND.
Frequency-Select Input. When FREQ is low, the oscillator frequency will be set
to 640kHz. When FREQ is high, the frequency will be set to 1.2MHz. This input
has a 6μA pull-down current.
Soft-Start Control. Connect a soft-start capacitor (CSS) to this pin. A 4μA
10
SS
constant current charges the soft-start capacitor. When EN connected to GND,
the soft-start capacitor is discharged. When EN connected to VDD high, the
soft-start capacitor is charged to VDD. Leave floating for not using soft-start.
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS9297-02 June 2012


Part Number RT9297
Description 3A High Performance Step-Up DC/DC Converter
Maker Richtek Technology
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RT9297 Datasheet PDF






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