RT8271 데이터 시트보기 (PDF) - Richtek Technology
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RT8271 Datasheet PDF : 15 Pages
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RT8271
Absolute Maximum Ratings (Note 1)
z Supply Voltage, VIN ----------------------------------------------------------------------------------------- −0.3V to 26V
z Switching Voltage, SW ------------------------------------------------------------------------------------- −0.3V to (VIN + 0.3V)
z BOOT Voltage ------------------------------------------------------------------------------------------------ (VSW − 0.3V) to (VSW + 6V)
z The Other Pins Voltage ------------------------------------------------------------------------------------- −0.3V to 6V
z Power Dissipation, PD @ TA = 25°C
SOP-8 ---------------------------------------------------------------------------------------------------------- 0.833W
MSOP-10 (Exposed Pad) ---------------------------------------------------------------------------------- 1.163W
z Package Thermal Resistance (Note 2)
SOP-8, θJA ---------------------------------------------------------------------------------------------------- 120°C/W
MSOP-10 (Exposed Pad), θJA ---------------------------------------------------------------------------- 86°C/W
MSOP-10 (Exposed Pad), θJC ---------------------------------------------------------------------------- 30°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 3)
HBM (Human Body Mode) --------------------------------------------------------------------------------- 2kV
MM (Machine Mode) ---------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions (Note 4)
z Supply Voltage, VIN ----------------------------------------------------------------------------------------- 4.75V to 24V
z Enable Voltage, VEN ----------------------------------------------------------------------------------------- 0V to 5.5V
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
Feedback Reference Voltage
High Side Switch-On Resistance
Low Side Switch-On Resistance
Switch Leakage
VFB
RDS (ON )1
RDS (ON )2
Current Limit
Current Sense Transconductance
Error Amplifier Tansconductance
Oscillator Frequency
Short Circuit Oscillation Frequency
Maximum Duty Cycle
Minimum On-Time
Under Voltage Lockout Threshold
Rising
ILIM
GCS
Gm
fSW
DMAX
tON
Under Voltage Lockout Threshold
Hysteresis
Test Conditions
Min
4.75V ≤ VIN ≤ 24V
0.902
--
--
VEN = 0V, VSW = 0V
--
Duty = 75%; VBOOT−SW = 4.8V --
Output Current to VCOMP
--
ΔIC = ±10μA
620
--
VFB = 0V
--
VFB = 0.8V
--
--
Typ
0.92
0.18
10
--
3
2.5
920
1.2
440
75
90
Max Unit
0.938 V
--
Ω
--
Ω
10 μA
--
A
-- A/V
1220 μA/V
-- MHz
-- kHz
--
%
--
ns
3.8 4.2 4.5 V
-- 250 -- mV
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4
To be continued
DS8271-02 March 2011
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