RT8256 데이터 시트보기 (PDF) - Richtek Technology
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RT8256 Datasheet PDF : 12 Pages
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RT8256
Absolute Maximum Ratings (Note 1)
z Supply Voltage, VIN ----------------------------------------------------------------------------------------- 23V
z Switching Voltage, SW ------------------------------------------------------------------------------------- −0.3V to (VIN + 0.3V)
z BOOT Voltage ------------------------------------------------------------------------------------------------ (VSW − 0.3V) to (VSW + 6V)
z The Other Pins ----------------------------------------------------------------------------------------------- −0.3V to 6V
z Power Dissipation, PD @ TA = 25°C
SOP-8 ---------------------------------------------------------------------------------------------------------- 0.833W
z Package Thermal Resistance (Note 2)
SOP-8, θJA ---------------------------------------------------------------------------------------------------- 120°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 ----------------------------------------------------------------------------------------- 22V
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
En input Low Voltage
En input High Voltage
Enable Pull Up Current
Test Conditions
4.75V ≤ VIN ≤ 22V
VEN = 0V, VSW = 0V
Duty = 90%; VBOOT−SW = 4.8V
Output Current to VCOMP
ΔIC = ±10μA
VFB = 0V
VFB = 0.8V
Min Typ Max Unit
1.184 1.222 1.258 V
-- 0.18 --
Ω
--
10 --
Ω
--
-- 10 μA
--
2.7 --
A
--
2.5 -- A/V
-- 780 -- μA/V
340 400 460 kHz
-- 120 -- kHz
--
90 --
%
--
100 --
ns
4
4.2 4.5 V
-- 300 -- mV
--
-- 0.4 V
1.4
--
--
V
--
1
-- μA
DS8256-01 March 2011
To be continued
www.richtek.com
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