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PDF RT9284C Data sheet ( Hoja de datos )
| Número de pieza | RT9284C | |
| Descripción | Constant Current Switching Regulator | |
| Fabricantes | Richtek Technology | |
| Logotipo |  |
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Conceptual
RT9284A/B/C
Tiny Package, High Performance, Constant Current
Switching Regulator for White LED
General Description
Features
The RT9284A/B/C is a compact, high efficient and high
integration LED driver. Internal 20V MOSFET can support
2 to 4 White LEDs for backlighting and camera flashing.
Highly integration and internal compensation network
minimizes as 5 external component counts. Tiny package
type of TSOT-23 package provide the best solution for
PCB space saving and total BOM cost.
Internal 0.1V low current feedback voltage, which minimize
the power loss due to the current sense resistor. Optimized
operation frequency can meet the requirement of small
LC filters value and low operation current with high
efficiency, as one of the LED is open. Floating or pull EN
pin low can easily disable this function. For reducing the
inrush current, internal soft start function can protect inrush
current.
Ordering Information
RT9284 (- )
z VIN Operating Range: 3.0V to 5.5V
z Maximum Output Voltage up to 20V
z Dimming with Zero-inrush and Wide Frequency
Range of 100 to 100kHz
z Over Voltage Protection
z Output Current up to 100mA at VOUT = 12V.
z Zero Shutdown Supply Current
z Minimize the Output Component
z Small LC Filter
z Internal Soft Start
Applications
z Camera Flash white Led
z Mobile Phone, Smart Phone Led Backlight
z PDA Led Backlight
z Digital Still Camera
z Camcorder
Pin Configurations
Package Type
J5 : TSOT23-5
J6 : TSOT23-6
Operating Temperature Range
C : Commercial Standard
P : Pb Free with Commercial Standard
OVP Voltage
Default : No OVP Voltage
15 : 15V
18 : 18V
FB Voltage
A : 0.1V
B : 0.25V
C : 1.235
TOP VIEW
LX 1 5 VDD
GND 2
FB 3 4 EN
TSOT-23-5
VDD OVP EN
654
123
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.
LX GND FB
TSOT-23-6
Note : There is no pin1 indicator on top mark for TSOT-23-6
type, and pin 1 will be lower left pin when reading top mark
from left to right.
DS9284A/B/C-00C March 2005
1
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1 page  
Conceptual
RT9284A/B/C
Parameter
Symbol
Test Condition
Min Typ Max Units
Reference Voltage
Feedback Voltage (Note 5)
RT9284A
RT9284B
Default
Option 1
0.095 0.1 0.105 V
0.237 0.25 0.263 V
RT9284C
1.173 1.235 1.296 V
MOSFET
On Resistance of MOSFET
Protection
OVP Threshold
OCP
Shut Down Voltage
Enable Voltage
RDS(ON)
VOVP
for 2,3 WLEDs application
for 4 WLEDs application
VEN
VEN
-- 0.75 -- Ω
-- 15 -- V
-- 18 - V
-- 1000 -- mA
-- -- 0.4 V
1.6 --
-- V
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. Devices are ESD sensitive. Handling precaution recommended.
Note 3. The device is not guaranteed to function outside its operating conditions.
Note 4. θJA is measured in the natural convection at TA = 25°C on a low effective thermal conductivity test board of
JEDEC 51-3 thermal measurement standard.
Note 5. Floating the OVP pin to disable OVP function.
DS9284A/B/C-00C March 2005
5
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5 Page 
Outline Dimension
Conceptual
RT9284A/B/C
D
C
b
A
e
H
L
B
A1
Symbol
A
A1
B
b
C
D
e
H
L
Dimensions In Millimeters
Min Max
0.700
1.000
0.000
0.100
1.397
1.803
0.350
0.559
2.591
3.000
2.692
3.099
0.838
1.041
0.100
0.254
0.356
0.610
Dimensions In Inches
Min Max
0.028
0.039
0.000
0.004
0.055
0.071
0.014
0.022
0.102
0.118
0.106
0.122
0.033
0.041
0.004
0.010
0.014
0.024
TSOT- 23-5 Surface Mount Package
DS9284A/B/C-00C March 2005
11
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11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet RT9284C.PDF ] | |
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