RT8253A データシートの表示（PDF） - Richtek Technology
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RT8253A Datasheet PDF : 15 Pages
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RT8253A
Absolute Maximum Ratings (Note 1)
z VIN ------------------------------------------------------------------------------------------------------------------ −0.3V to 25V
z SW ----------------------------------------------------------------------------------------------------------------- −0.3V to (VIN + 0.3V)
z BOOT ------------------------------------------------------------------------------------------------------------- (SW−0.3V) to (SW + 6V)
z All Other Voltages ---------------------------------------------------------------------------------------------- −0.3V to 6V
z BOOT − SW ----------------------------------------------------------------------------------------------------- −0.3V to 6V
z Power Dissipation, PD @ TA = 25°C
SOP-8 (Exposed Pad) ---------------------------------------------------------------------------------------- 1.333W
z Package Thermal Resistance (Note 2)
SOP-8 (Exposed Pad), θJA ----------------------------------------------------------------------------------- 75°C/W
SOP-8 (Exposed Pad), θJC ---------------------------------------------------------------------------------- 15°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 Voltage, VIN -------------------------------------------------------------------------------------------- 4.5V to 23V
z Junction Temperature Range --------------------------------------------------------------------------------- −40°C to 125°C
z Ambient Temperature Range --------------------------------------------------------------------------------- −40°C to 85°C
Electrical Characteristics
(VIN = 12V, TA = 25°C, unless otherwise specified)
Parameter
Symbol
Test Conditions
Shutdown Supply Current
VEN = 0V
Supply Current
Feedback Reference
Voltage
Error Amplifier
Transconductance
High Side Switch
On Resistance
Low Side Switch
On Resistance
High Side Switch Leakage
Current
Upper Switch Current Limit
COMP to Current Sense
Transconductance
Oscillation Frequency
Short Circuit Oscillation
Frequency
VFB
gEA
RDS(ON)1
RDS(ON)2
gCS
fOSC1
fOSC2
VEN = 3 V, VFB = 0.9V
4.5V ≤ VIN ≤ 23V
ΔIC = ± 10μA
VEN = 0V, VSW = 0V
Min. Duty Cycle,
VBOOT − VSW = 4.8V
VFB = 0V
Maximum Duty Cycle
Minimum On Time
DMAX
tON
VFB = 0.7V
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4
Min
--
--
0.788
--
--
--
--
--
--
300
--
--
--
Typ Max Unit
0.5
3
μA
0.8
1.2
mA
0.8 0.812 V
940
--
μA/V
85
--
mΩ
85
--
mΩ
0
10
μA
5.8
--
A
5.6
--
A/V
340 380 kHz
110
--
kHz
93
--
%
100
--
ns
To be continued
DS8253A-02 March 2011
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