RT9275 데이터 시트보기 (PDF) - Richtek Technology
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RT9275 Datasheet PDF : 14 Pages
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Preliminary
RT9275
Absolute Maximum Ratings (Note 1)
z Supply Voltage --------------------------------------------------------------------------------------------------------- 7V
z LX Pin Switch Voltage ------------------------------------------------------------------------------------------------ −0.3V to 7V
z Other I/O Pin Voltages ----------------------------------------------------------------------------------------------- −0.3V to 7V
z LX Pin Switch Current ------------------------------------------------------------------------------------------------ 2.5A
z EXT Pin Driver Current ------------------------------------------------------------------------------------------------ 200mA
z Power Dissipation, PD @ TA = 25°C
SOT-23-6 --------------------------------------------------------------------------------------------------------------- 0.4W
z Package Thermal Resistance (Note 3)
SOT-23-6, θJA ---------------------------------------------------------------------------------------------------------- 250°C/W
z Junction Temperature ------------------------------------------------------------------------------------------------- 150°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
Electrical Characteristics
(VIN = 1.5V, VOUT = VDD = 3.3V, TA = 25°C, unless otherwise specified)
Parameter
Symbol
Test Conditions
Start-UP Voltage
Operating VDD Range
VST
IL = 1mA
VDD
VDD pin voltage
No Load Current I (VIN) (Note 4)
Continuous Switching Current
INO LOAD
ISWITCH
VIN = 1.5V, VOUT = 3.3V
VIN = EN = 3.3V, VFB = GND
Switch-off Current I (VDD)
ISWITCH OFF VIN = 6V
Shutdown Current I (VIN)
IOFF
Feedback Reference Voltage
Output Voltage Temperature
Coefficient (refer to VFB)
VREF
Ts
Switching Frequency
FS
Frequency Temperature Coefficient Δf
EN = 0V, VIN = 4.5V
Close Loop, VDD = 3.3V
TA = −40°C to 85°C
VDD = 3.3V
TA = −40°C to 85°C
Maximum Duty
LX ON Resistance
Current Limit Setting (Note 5)
DMAX
ILIM
VDD = 3.3V
VDD = 3.3V
VDD = 3.3V
EXT ON Resistance to VDD
EXT ON Resistance to GND
Line Regulation (refer to VFB)
Load Regulation (Note 6)
ΔVLINE
ΔVLOAD
VDD = 3.3V
VDD = 3.3V
VDD = 3.5 ~ 6V, IL = 1mA
VIN = 2.5V, IL = 1 ~ 100mA
VDD Over Voltage Protection
EN Pin Trip Level
VDD = 3.3V
Min
--
2
--
0.2
--
--
1.225
--
300
85
--
1.5
--
--
--
--
6.3
0.4
Typ Max Units
0.9 1.0
V
--
6
V
160 200 μA
0.3 0.5 mA
50 75 μA
0.01 1
μA
1.25 1.275 V
50
-- ppm/°C
400 500 kHz
0.3
%/°C
90
--
%
0.3 1.1
Ω
2.0 2.5
A
5
8.5
Ω
5
8.5
Ω
1.5 10 mV/V
0.25 -- mV/mA
6.8 7.3
V
0.8 1.2
V
To be continued
DS9275-06 March 2007
www.richtek.com
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