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PDF RT8453B Data sheet ( Hoja de datos )
| Número de pieza | RT8453B | |
| Descripción | High Voltage Buck LED Driver | |
| Fabricantes | Richtek | |
| Logotipo |  |
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RT8453B
1.5A, 500kHz, 40V High Voltage Buck LED Driver
General Description
The RT8453B is a buck current mode PWM regulator for
LED driving applications. It provides an integrated 1.5A
switch and can be operated with a wide input voltage range
from 4.5V to 40V. With a 500kHz operating frequency, the
RT8453B allows all external inductor and input/output
capacitors to be small. High efficiency is achieved with its
190mV current sensing capability. Dimming can be either
analog or PWM digital signal driven. The RT8453B is
available in a small SOP-8 (Exposed pad) package.
Ordering Information
RT8453B
Package Type
SP : SOP-8 (Exposed Pad-Option 2)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
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
RT8453B
GSPYMDNN
RT8453BGSP : Product Number
YMDNN : Date Code
Features
z Input Operating Range 4.5 to 40V
z 1.5A Switching Current Limitation
z 10% Constant Current Output Accuracy
z Current Mode PWM with 500kHz Switching
Frequency
z Analog or PWM Control Signal for LED Dimming
z Programmable Soft-Start
z Input Under Voltage Lockout
z Over Temperature Protection
z RoHS Compliant and Halogen Free
Applications
z General Illumination
z Desk Lights and Room Lighting
z Industrial Backlight/Lighting
z Constant Current Source
Pin Configurations
(TOP VIEW)
ISN
VC
ACTL
EN
8
27
GND
36
9
45
VCC
SW
GND
SS
SOP-8 (Exposed Pad)
DS8453B-01 May 2011
www.richtek.com
1 page  
RT8453B
Parameter
Symbol
Test Conditions
Min Typ Max Unit
Maximum Duty Cycle (Note 6)
SW On-Voltage
SW Current Limit
VSW
ILIM_SW
Soft-Start
Soft-Start Current
ISS
Over Temperature Protection
Thermal Shutdown Temperature TSD
Thermal Shutdown Hysteresis ΔTSD
ISW = 0.5A
VSS ≤ 2V
-- 88 -- %
-- 0.4 -- V
1.25
1.5
--
A
-- 6 -- μA
-- 150 -- °C
-- 10 -- °C
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 sections of the specifications is not implied. Exposure to absolute maximum rating conditions for
extended periods may remain possibility to affect device reliability.
Note 2. If connected with a 20kΩ series resistor, this pin can go up to 40V.
Note 3. θJA is measured in natural convection at TA = 25°C on a high effective thermal conductivity four-layer test board of
JEDEC 51-7 thermal measurement standard. The measurement case position of θJC is on the exposed pad of the
package.
Note 4. Devices are ESD sensitive. Handling precaution is recommended.
Note 5. The device is not guaranteed to function outside its operating conditions.
Note 6. When the natural maximum duty cycle of 500kHz switching frequency is reached, the switching cycle will be skipped
(not reset) as the operating condition requires to effectively stretch and achieve higher on cycle.
DS8453B-01 May 2011
www.richtek.com
5 Page 
Outline Dimension
EXPOSED THERMAL PAD
(Bottom of Package)
J
A
Y
XB
RT8453B
H
M
F
C
I
D
Symbol
A
B
C
D
F
H
I
J
M
Option 1
Option 2
X
Y
X
Y
Dimensions In Millimeters
Min
4.801
Max
5.004
3.810
4.000
1.346
1.753
0.330
0.510
1.194
1.346
0.170
0.000
0.254
0.152
5.791
0.406
6.200
1.270
2.000
2.300
2.000
2.300
2.100
2.500
3.000
3.500
Dimensions In Inches
Min
0.189
Max
0.197
0.150
0.157
0.053
0.069
0.013
0.020
0.047
0.053
0.007
0.000
0.010
0.006
0.228
0.016
0.244
0.050
0.079
0.091
0.079
0.091
0.083
0.098
0.118
0.138
8-Lead SOP (Exposed Pad) Plastic Package
Richtek Technology Corporation
Headquarter
5F, No. 20, Taiyuen Street, Chupei City
Hsinchu, Taiwan, R.O.C.
Tel: (8863)5526789 Fax: (8863)5526611
Richtek Technology Corporation
Taipei Office (Marketing)
5F, No. 95, Minchiuan Road, Hsintien City
Taipei County, Taiwan, R.O.C.
Tel: (8862)86672399 Fax: (8862)86672377
Email: [email protected]
Information that is provided by Richtek Technology Corporation is believed to be accurate and reliable. Richtek reserves the right to make any change in circuit design,
specification or other related things if necessary without notice at any time. No third party intellectual property infringement of the applications should be guaranteed
by users when integrating Richtek products into any application. No legal responsibility for any said applications is assumed by Richtek.
DS8453B-01 May 2011
www.richtek.com
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet RT8453B.PDF ] | |
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