RT9278 데이터 시트보기 (PDF) - Richtek Technology
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RT9278 Datasheet PDF : 13 Pages
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Preliminary
RT9278
Absolute Maximum Ratings (Note 1)
l Supply Voltage, VDD ------------------------------------------------------------------------------------------------- 7V
l LX Pin Voltage -------------------------------------------------------------------------------------------------------- − 0.3V to 7V
l The Other pins -------------------------------------------------------------------------------------------------------- − 0.3V to 7V
l Power Dissipation, PD @ TA = 25°C
VDFN-10L 3x3 -------------------------------------------------------------------------------------------------------- 1.43W
l Package Thermal Resistance (Note 4)
VDFN-10L 3x3, θJA--------------------------------------------------------------------------------------------------- 70°C/W
l Lead Temperature (Soldering, 10 sec.)-------------------------------------------------------------------------- 260°C
l Operation Temperature Range ------------------------------------------------------------------------------------ −40°C to 85°C
l Storage Temperature Range --------------------------------------------------------------------------------------- − 65°C to 150°C
l ESD Susceptibility (Note 2)
HBM (Human Body Mode) ----------------------------------------------------------------------------------------- 2kV
Recommended Operating Conditions (Note 3)
l Ambient Temperature Range -------------------------------------------------------------------------------------- 0°C to 70°C
l Junction Temperature Range -------------------------------------------------------------------------------------- 0°C to 125°C
Electrical Characteristics
(VBAT = 1.8V, VOUT = 3.3V, TA = 25°C, unless otherwise specified)
Parameter
Symbol
Test Conditions
Min Typ Max Units
Start-Up Voltage
Operating Voltage Range, After start-up
VOUT Output Voltage Range
VOUT Over Voltage Protection
VST
IL = 1mA
VBAT
VOUT_ADJ
--
1.5
--
V
1.1
--
5.5
V
2.4
--
5.5
V
--
6.5
--
V
Switch-off Current I (VBAT)
Shutdown Current
Feedback Reference Voltage
Switching Frequency
Maximum Duty
SWN Switch ON Resistance
SWP Switch ON Resistance
Current Limit Setting
Error Amplifier
ISW OFF VOUT = 3.3V, VFB = 0.9V
--
200 350 µA
IOFF
EN Pin = 0V, Open Loop
-- 0.01 1
µA
VFB
Close Loop, VOUT = 3.3V 0.784 0.8 0.816 V
FS
-- 650 --
kHz
D(MAX)
--
85
--
%
VOUT = 3.3V
-- 210 --
mΩ
VOUT = 3.3V
-- 240 --
mΩ
ISW
VOUT = 3.3V
--
2
--
A
GM
--
0.2
--
ms
Compensation Source Current
--
22
--
uA
Compensation Sink Current
--
22
--
uA
To be continued
DS9278-04 August 2007
www.richtek.com
7
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