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  Richtek Technology Electronic Components Datasheet  

RT9288A Datasheet

PWM Step-Up DC/DC Controller

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RT9288A
PWM Step-Up DC/DC Controller for White-LED Driver
General Description
The RT9288A is a wide input operating voltage range step-
up controller. High voltage output and large output current
are feasible by using an external N-MOSFET. The RT9288A
input operating range is from 3V to 13.5V. Besides, it
could support up to 60V output at 12V input.
The RT9288A is an optimized design for WLED driver
applications. Adjusting the output current of the RT9288A
changes the brightness of the WLEDs. Chip Enable pin
can be used as a digital input allowing WLED brightness
control with a logic-level PWM signal.
Ordering Information
RT9288A
Package Type
E : SOT-23-6
Note :
Lead Plating System
P : Pb Free
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.
Features
z VIN Operating Range : 3V to 13.5V
z Fixed PWM Frequency : 1MHz
z 200Hz to 200kHz PWM Dimming Frequency
z Flexible PWM/Analog Dimming Control
z Voltage Mode with External Compensation
z Soft Start Function
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z TFT LCD Panels
z LED Backlighting
Pin Configurations
(TOP VIEW)
EXT GND COMP
654
23
VDD EN FB
SOT-23-6
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Functional Pin Description
Pin No. Pin Name
Pin Function
1 VDD
Supply Input Voltage Pin. Bypass an 1uF capacitor to GND to reduce the input noise.
2 EN
Chip Enable (Active High).
3 FB
4 COMP
5 GND
6 EXT
Feedback to Error Amplifier Input.
Output of Error Amplifier. Connect a capacitor between the COMP pin and GND for
compensation. While shutdown, this pin is pulled down by an internal resistor.
Ground Pin.
Output for External Transistor.
DS9288A-02 April 2011
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT9288A Datasheet

PWM Step-Up DC/DC Controller

No Preview Available !

RT9288A
Typical Application Circuit
L1
VIN 10uH/1.5A
5V
C1
C2 R1
RT9288A
100nF
1 VDD
EXT 6
R2
10
PWM
Dimming
2 EN
5 GND
COMP 4 C3 100nF
FB 3
R3
D1
VOUT
30V/25mA
C4
10uF
Figure 1. LED Driver with PWM Brightness Control (5V J 30V)
L1
VIN 10uH/1.5A
12V
C1 C2 R1
100nF
RT9288A
1 VDD
EXT 6
R2
10
PWM
Dimming
2 EN
5 GND
COMP 4 C3 100nF
FB 3
R3
D1
VOUT
60V/25mA
C4
10uF
Figure 2. LED Driver with PWM Brightness Control (12V J 60V)
L1
VIN
10uH/1.5A
D1 VOUT
12V 24V
C1
C2
100nF
Chip Enable
R1
RT9288A
1 VDD
EXT 6
2 EN
COMP 4
R2
10
RC
30k
CC
6.8nF
R3
C4
10uF
5 GND
FB 3
R4
Figure 3. Application for Constant Output Voltage
www.richtek.com
2
DS9288A-02 April 2011


Part Number RT9288A
Description PWM Step-Up DC/DC Controller
Maker Richtek Technology
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RT9288A Datasheet PDF






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