RT9271 데이터 시트보기 (PDF) - Richtek Technology
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RT9271 Datasheet PDF : 15 Pages
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RT9271
Absolute Maximum Ratings (Note 1)
z Supply Voltage, VCC -------------------------------------------------------------------------------------------------- −0.3V to 7V
z LX, OVP ----------------------------------------------------------------------------------------------------------------- −0.3V to 21V
z The Other Pins --------------------------------------------------------------------------------------------------------- −0.3V to 7V
z Power Dissipation, PD @ TA = 25°C
SOT-23-6 ---------------------------------------------------------------------------------------------------------------- 0.4W
z Package Thermal Resistance (Note 4)
SOT-23-6, θJA ----------------------------------------------------------------------------------------------------------- 250°C/W
z Maximum Junction Temperature ----------------------------------------------------------------------------------- 125°C
z Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------- 260°C
z Storage Temperature Range ---------------------------------------------------------------------------------------- −65°C to 150°C
z ESD Susceptibility (Note 2)
HBM (Human Body Mode) ------------------------------------------------------------------------------------------ 2kV
MM (Machine Mode) -------------------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions (Note 3)
z Supply Voltage, VCC -------------------------------------------------------------------------------------------------- 2.4V to 6V
z Junction Temperature Range ---------------------------------------------------------------------------------------- −40°C to 125°C
Electrical Characteristics
(VCC = 3.6V, TA = 25°C, unless otherwise specified.)
Parameter
Symbol
Test Condition
Min Typ Max Units
System Supply Input
Under Voltage Lock Out
UVLO
1.8
2.2
2.3
V
Maximum Output Voltage
--
--
20
V
Supply Current
ICC1
VCC=6V, Continuously Switching
--
--
2
mA
Quiescent Current
ICC2
VCC=6V, FB=1.3V, No Switching
50
90
120 μA
Shut Down Current
ICC3
VCC=6V, VEN<0.4V
--
0.1
1
μA
Oscillator
Operation Frequency
FOSC
0.9
1.1
1.3 MHz
Maximum Duty Cycle
Dmax
85
90
--
%
Reference Voltage
Feedback Voltage
VFB
0.237 0.25 0.263 V
MOSFET
On Resistance of MOSFET Rds(on)
0.5 0.75 1.0 Ω
Current Limit
Imax1
Normal Operation
800 900 1000 mA
Current Limit
Imax2
Start up Condition
500 625 750 mA
Control and Protection
Shut Down Voltage
VEN1
0.4
0.8
--
V
Enable Voltage
VEN2
--
0.8
1.4
V
EN Pin Pull Low Current
IEN
--
4
6
μA
OVP Threshold (Note 5)
OVP
14.5 15.5 20.0 V
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DS9271-13 March 2007
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