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RT9284B-15GJ6E

P1-P3P4-P6P7-P9P10-P12P13-P14
4
RT9284A/B
www.richtek.com
DS9284A/B-07 April 2011
Absolute Maximum Ratings (Note 1)
z Supply Input Voltage ---------------------------------------------------------------------------------------------------- −0.3V to 7V
z LX Input Voltage ---------------------------------------------------------------------------------------------------------- −0.3V to 22V
z OVP Voltage -------------------------------------------------------------------------------------------------------------- −0.3V to 22V
z The Other Pins ----------------------------------------------------------------------------------------------------------- −0.3V to 6V
z Power Dissipation, P
D
@ T
A
= 25°C
TSOT-23-5 ----------------------------------------------------------------------------------------------------------------- 0.455W
TSOT-23-6 ----------------------------------------------------------------------------------------------------------------- 0.455W
z Package Thermal Resistance (Note 2)
TSOT-23-5, θ
JA
------------------------------------------------------------------------------------------------------------ 220°C/W
TSOT-23-6, θ
JA
------------------------------------------------------------------------------------------------------------ 220°C/W
z Lead Temperature (Soldering, 10 sec.) ----------------------------------------------------------------------------- 260°C
z Junction Temperature --------------------------------------------------------------------------------------------------- 150°C
z Storage Temperature Range ------------------------------------------------------------------------------------------- −65°C to 150°C
z ESD Susceptibility (Note 3)
HBM (Human Body Mode) --------------------------------------------------------------------------------------------- 2kV
MM (Machine Mode) ---------------------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions (Note 4)
z Supply Input Voltage ---------------------------------------------------------------------------------------------------- 2.7V to 5.5V
z Junction Temperature Range ------------------------------------------------------------------------------------------ −40°C to 125°C
z Ambient Temperature Range ------------------------------------------------------------------------------------------ −40°C to 85°C
Electrical Characteristics
To be continued
(V
IN
= 3.7V, T
A
= 25°C unless otherwise specified)
Parameter Symbol Test Conditions Min Typ Max Unit
System Supply Input
Operation voltage Range
V
DD
2.7 -- 5.5 V
Under Voltage Lock Out
V
DD
1.8 2.2 2.5 V
Quiescent Current
I
DD
FB = 1.5V, No switch 50 300 1000 uA
Supply Current
I
DD
FB = 0V, Switch 0.1 2 3 mA
Shut Down Current
I
DD
V
EN
< 0.4V
-- -- 1 uA
Line Regulation
V
IN
: 3.0~4.3V
-- 3 -- %
Oscillator
Operation Frequency
f
OSC
0.9 1.2 1.5 MHz
Maximum Duty Cycle 85 -- -- %
Dimming Frequency 100 -- 100k Hz
Reference Voltage
RT9284A 1.173 1.235 1.296
Feedback Voltage (Note 5)
RT9284B 0.237 0.25 0.263
V
5
RT9284A/B
DS9284A/B-07 April 2011
www.richtek.com
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. θ
JA
is measured in the natural convection at T
A
= 25°C on a low effective thermal conductivity test board of
JEDEC 51-3 thermal measurement standard.
Note 3. Devices are ESD sensitive. Handling precaution recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
Note 5. Floating the OVP pin to disable OVP function.
Parameter Symbol Test Condition Min Typ Max Unit
MOSFET
On Resistance of MOSFET
R
DS(ON)
-- 0.75 --
Ω
Protection
for 2,3,4 WLEDs application 14 15 16
OVP Threshold
V
OVP
for 5 WLED application 19 20 21
V
OVP Sink Current -- 5 -- μA
OCP -- 750 -- mA
Shut Down Voltage
V
EN
-- -- 0.4 V
Enable Voltage
V
EN
1.5 -- -- V
6
RT9284A/B
www.richtek.com
DS9284A/B-07 April 2011
Typical Operating Characteristics
LED Current vs. Input Voltage
18
18.5
19
19.5
20
20.5
21
21.5
22
3 3.25 3.5 3.75 4 4.25 4.5 4.75 5 5.25 5.5
Input Voltage (V)
LED Current (mA)
4WLEDs, L = 10μH
Maximum Duty Cycle vs. V
DD
85%
86%
87%
88%
89%
90%
91%
3 3.25 3.5 3.75 4 4.25 4.5 4.75 5 5.25 5.5
V
DD
(V)
Maximum Duty Cycle (%)
91
90
89
88
87
86
85
POR (Rising/Falling) vs. Temperature
1.5
1.7
1.9
2.1
2.3
2.5
2.7
-40-30-20-100 102030405060708090
Temperature
POR (V)
(°C)
Rising
Falling
Shut Down Voltage vs. Input Voltage
0.5
0.6
0.7
0.8
0.9
1
1.1
1.2
3 3.25 3.5 3.75 4 4.25 4.5 4.75 5 5.25 5.5
Input Voltage (V)
Shut Down Voltage (V)
-45°C
25°C
85°C
Enable Voltage vs. Input Voltage
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
3 3.25 3.5 3.75 4 4.25 4.5 4.75 5 5.25 5.5
Input Voltage (V)
Enable Voltage (V)
-45°C
25°C
85°C
Efficiency vs. Input Voltage
80.5
81
81.5
82
82.5
83
83.5
84
3 3.2 3.4 3.6 3.8 4 4.2 4.4
Input Voltage (V)
Efficiency (%)
3WLEDs
4WLEDs
I
LED
= 20mA, L = 4.7μH, DCR = 0.15Ω
P1-P3P4-P6P7-P9P10-P12P13-P14

RT9284B-15GJ6E

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Description:
IC LED DRIVER RGLTR DIM TSOT23-6
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