RT9300AGE Richtek USA Inc, RT9300AGE Datasheet

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RT9300AGE

Manufacturer Part Number
RT9300AGE
Description
IC LED DVR WHITE BCKLGT SOT23-6
Manufacturer
Richtek USA Inc
Datasheet

Specifications of RT9300AGE

Constant Current
Yes
Internal Driver
Yes
Type - Primary
Backlight, General Purpose
Type - Secondary
White LED
Mounting Type
Surface Mount
Topology
Linear (LDO), PWM
Number Of Outputs
4
Voltage - Supply
2.5 V ~ 5.5 V
Package / Case
SOT-23-6
Operating Temperature
-40°C ~ 85°C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Frequency
-
Voltage - Output
-
Tiny Package, Low Dropout Current Source
General Description
The RT9300A/B low-dropout bias supply for white LEDs
is a high-performance alternative to the simple ballast
resistors used in conventional white LED designs. The
RT9300A/B uses an internal resistor to set the bias
current for four LEDs, which are matched to 5%. The
RT9300A/B's advantages over ballast resistors include
much lower bias variation with supply voltage variation,
significantly lower dropout voltage, and in some applications,
significantly improved efficiency. The RT9300A/B requires
only a 60/45mV dropout voltage at a 20/15mA load on
each output to match the LED brightness.
Ordering Information
Note :
Richtek Pb-free and Green products are :
Typical Application Circuit
DS9300A/B-04 October 2008
RT9300A/B
RoHS compliant and compatible with the current require-
Suitable for use in SnPb or Pb-free soldering processes.
ments of IPC/JEDEC J-STD-020.
Package Type
E : SOT-23-6
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
Sink Current
A : 20mA
B : 15mA
cial Standard)
Enable
V
IN
Figure 1. Application Circuit for Backlight.
1
EN
LED1
6
LED2
RT9300A/B
5
GND
2
LED3
Features
Applications
Pin Configurations
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area, otherwise visit our website for detail.
4
Low 60/45mV Dropout at 20/15mA
5% LED Current Matching
Simple LED Brightness Control
2.5V to 5.5V Supply Voltage Range
Thermal Shutdown Protection
RoHS Compliant and 100% Lead (Pb)-Free
Next-Generation Wireless Handsets
PDAs, Palmtops, and Handy Terminals
Digital Cameras, Camcorders
Battery-Powered Equipment
LED4
3
0.1uF
C
LED1 LED2 LED3
(TOP VIEW)
EN GND LED4
6
SOT-23-6
5
2
RT9300A/B
4
3
www.richtek.com
1

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RT9300AGE Summary of contents

Page 1

Tiny Package, Low Dropout Current Source General Description The RT9300A/B low-dropout bias supply for white LEDs is a high-performance alternative to the simple ballast resistors used in conventional white LED designs. The RT9300A/B uses an internal resistor to set the ...

Page 2

RT9300A/B Function Block Diagram EN Functional Pin Description Pin Name 1 EN Chip Enable (Active High). 2 GND Ground LED4 Cathode Connection. Current flowing into LED4 is Constant. (20mA/15 mA) 3 LED4 LED4 is High Impedance when EN is Low. ...

Page 3

Absolute Maximum Ratings Supply Input Voltage, V ------------------------------------------------------------------------------------------------ IN The other pins -------------------------------------------------------------------------------------------------------------- Power Dissipation 25° SOT-23-6 -------------------------------------------------------------------------------------------------------------------- 0.4W Package Thermal Resistance (Note 4) SOT-23-6, θ --------------------------------------------------------------------------------------------------------------- 250°C/W JA Lead Temperature (Soldering, 10 sec.) ...

Page 4

RT9300A/B Note 1. Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational ...

Page 5

Typical Operating Characteristics LED Current vs. Input Voltage LED 1 LED 2 12 LED 3 LED 2.5 3 Input Voltage (V) LED Current vs. Temperature 15.5 15.4 15.3 15.2 ...

Page 6

RT9300A/B Line Transient Response V = 3.2V to 3.7V IN Input Voltage (1V/Div) LED (25mA/Div) Current Time (100us/Div) www.richtek.com 6 DS9300A/B-04 October 2008 ...

Page 7

Applications Information The RT9300A 4-Channel current source driver for white LEDs. Enable Input EN powers the input of the RT9300A/B. This IC provides an under voltage lockout (UVLO) function to prevent it from unstable issue when startup. The ...

Page 8

RT9300A/B Layout Considerations For best performance, careful PCB layout is necessary. All peripheral components should be placed as close to the IC as possible. A short connection is highly recommended. The following guidelines should be strictly followed when designing a ...

Page 9

Outline Dimension Symbol Richtek Technology Corporation Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 Information that is provided by Richtek Technology Corporation is believed ...

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