RT8278 データシートの表示（PDF） - Richtek Technology
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RT8278 Datasheet PDF : 16 Pages
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RT8278
Absolute Maximum Ratings (Note 1)
VIN ---------------------------------------------------------------------------------------------------------------- −0.3V to 26V
SW --------------------------------------------------------------------------------------------------------------- −0.3V to (VIN + 0.3V)
BOOT ----------------------------------------------------------------------------------------------------------- (VSW − 0.3V) to (VSW + 6V)
All Other Pins ------------------------------------------------------------------------------------------------- −0.3V to 6V
Power Dissipation, PD @ TA = 25°C
SOP-8 (Exposed Pad) -------------------------------------------------------------------------------------- 1.333W
Package Thermal Resistance (Note 2)
SOP-8 (Exposed Pad), θJA --------------------------------------------------------------------------------- 75°C/W
SOP-8 (Exposed Pad), θJC -------------------------------------------------------------------------------- 28°C/W
Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------ 260°C
Junction Temperature ---------------------------------------------------------------------------------------- 150°C
Storage Temperature Range ------------------------------------------------------------------------------- −65°C to 150°C
ESD Susceptibility (Note 3)
HBM (Human Body Mode) --------------------------------------------------------------------------------- 2kV
MM (Machine Mode) ----------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions (Note 4)
Supply Input Voltage, VIN ----------------------------------------------------------------------------------- 4.5V to 24V
Junction Temperature Range ------------------------------------------------------------------------------- −40°C to 125°C
Ambient Temperature Range ------------------------------------------------------------------------------- −40°C to 85°C
Electrical Characteristics
(VIN = 12V, TA = 25°C, unless otherwise specified)
Par amete r
Sym bol
Test Conditions
Feedback Reference Voltage VFB
4.5V ≤ VIN ≤ 24V
Upper Switch On Resistance RDS(ON)1
Lower Switch On Resistance
Upper Switch Leakage
Current Limit
Current Sense
Trans c ondu cta nc e
Output Current to Comp Pin
Vo lta ge
Error Amplifier
Trans c ondu cta nc e
Oscillator Frequency
Short Circuit Frequency
Under Voltage Lockout
Threshold Rising
Under Voltage Lockout
Threshold Hysteresis
Maximum Duty Cycle
Minimum On Time
RDS(ON)2
ILEAK
ILIM
VEN = 0V, VSW = 0V
Duty = 90%,
VBOOT − VSW = 4.8V
gCS
gEA
fSW
VUVLO
ΔV UV LO
DMAX
tON
ΔIC = ±10μA
RRT = 24kΩ
VFB = 0V, RRT = 24kΩ
VFB = 0.7V, RRT = 24kΩ
M in
0.78 4
--
--
--
--
Typ
0 .8
0. 18
10
0
3
M ax
0 .816
--
--
10
--
Uni t
V
Ω
Ω
μA
A
--
1 .8
-- A/V
--
920
-- μA/V
--
2 .2
-- MHz
--
550
-- kHz
--
4 .2
--
V
--
430
--
mV
--
65
--
%
--
70
--
ns
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4
To be continued
DS8278-02 March 2011
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