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PDF RT8511A Data sheet ( Hoja de datos )
| Número de pieza | RT8511A | |
| Descripción | 43V Asynchronous Boost WLED Driver | |
| Fabricantes | Richtek | |
| Logotipo |  |
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®
RT8511A
43V Asynchronous Boost WLED Driver
General Description
The RT8511A is an LED driver IC that can support up to 10
WLED in series. It is composed of a current mode boost
converter integrated with a 43V/1.2A power switch running
at a fixed 1MHz frequency and covering a wide VIN range
from 2.7V to 24V.
The white LED current is set with an external resistor, and
the feedback voltage is regulated to 200mV (typ.). During
operation, the LED current can be controlled by the PWM
input signal in which the duty cycle determines the
feedback reference voltage.
For brightness dimming, the RT8511A is able to maintain
steady control of the LED current. Therefore, no audible
noises are generated on the output capacitor. The RT8511A
also has programmable over voltage pin to prevent the
output from exceeding absolute maximum ratings during
open LED conditions. The RT8511A is available in
WDFN-8L 2x2 and WDFN-8L 3x3 packages.
Ordering Information
RT8511A
Package Type
QW : WDFN-8L 2x2 (W-Type)
QWA : WDFN-8L 3x3 (W-Type)
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.
Features
Wide Input Voltage Range : 2.7V to 24V
High Output Voltage : up to 43V
Direct PWM Dimming Control and Frequency from
100Hz to 1kHz
Internal Soft -Start and Compensation
200mV Reference Voltage
PWM Dimming with Internal Filter
Programmable Over Voltage Protection
Over Temperature Protection
Current Limit Protection
Thin 8-Lead 2x2 and 8-Lead 3x3 WDFN Packages
RoHS Compliant and Halogen Free
Applications
UMPC and Notebook Computer Backlight
GPS, Portable DVD Backlight
Pin Configurations
(TOP VIEW)
OVP 1
FB 2
DIMC 3
GND 4
8 EN
7 PWM
6 VIN
9 5 LX
WDFN-8L 2x2 / WDFN-8L 3x3
Marking Information
RT8511AGQW
14W
14 : Product Code
W : Date Code
RT8511AGQWA
22=YM
DNN
22= : Product Code
YMDNN : Date Code
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8511A-05 June 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
RT8511A
Parameter
LED Current
Minimum PWM Dimming Duty
Cycle
Feedback Voltage
Fault Protection
LX Current Limit
Over Voltage Protection
Threshold
Thermal Shutdown
Temperature
Thermal Shutdown Hysteresis
Symbol
DMIN
VFB
ILIM
VOVP
TSD
TSD
Test Conditions
Dimming Freq. = 100Hz to 1kHz
Min Typ Max Unit
5 -- -- %
-- 200 -- mV
0.85 1.2 1.55
-- 1.2 --
A
V
-- 160 -- °C
-- 30 -- °C
Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only, and 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 may
affect device reliability.
Note 2. θJA is measured at TA = 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. θJC is
measured at the exposed pad of the package.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8511A-05 June 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
Outline Dimension
RT8511A
D2
D
L
E E2
SEE DETAIL A
1
eb
A
A3
A1
21
21
DETAIL A
Pin #1 ID and Tie Bar Mark Options
Note : The configuration of the Pin #1 identifier is optional,
but must be located within the zone indicated.
Symbol
A
A1
A3
b
D
D2
E
E2
e
L
Dimensions In Millimeters
Min Max
0.700
0.800
0.000
0.050
0.175
0.250
0.200
0.300
1.950
2.050
1.000
1.250
1.950
2.050
0.400
0.650
0.500
0.300
0.400
Dimensions In Inches
Min Max
0.028
0.031
0.000
0.002
0.007
0.010
0.008
0.012
0.077
0.081
0.039
0.049
0.077
0.081
0.016
0.026
0.020
0.012
0.016
W-Type 8L DFN 2x2 Package
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8511A-05 June 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet RT8511A.PDF ] | |
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