RT8280 查看數據表（PDF） - Richtek Technology
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RT8280 Datasheet PDF : 16 Pages
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RT8280
Absolute Maximum Ratings (Note 1)
VIN ---------------------------------------------------------------------------------------------------------------- −0.3V to 26V
SW --------------------------------------------------------------------------------------------------------------- −0.3V to (VIN + 0.3V)
BOOT ----------------------------------------------------------------------------------------------------------- (SW − 0.3V) to (SW + 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 ------------------------------------------------------------------------------- 15°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)
Parameter
Symbol
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
Transconductance
Output Current to Comp Pin
Voltage
Error Amplifier
Transconductance
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
ΔVUVLO
DMAX
tON
ΔIC = ±10μA
RRT = 24kΩ
VFB = 0V, RRT = 24kΩ
VFB = 0.7V, RRT = 24kΩ
Min Typ Max Unit
0.784 0.8 0.816 V
-- 0.11 --
Ω
--
10
--
Ω
--
0
10
μA
--
5
--
A
--
3.8
--
A/V
--
920
-- μA/V
--
2.2
-- MHz
--
230
--
kHz
--
4.2
--
V
--
430
--
mV
--
65
--
%
--
70
--
ns
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
www.richtek.com
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is a registered trademark of Richtek Technology Corporation.
DS8280-02 March 2012
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