RT8268 View Datasheet(PDF) - Richtek Technology
Part Name
Description
Manufacturer
RT8268 Datasheet PDF : 15 Pages
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RT8268
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 All Other 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
ILIM
Current Sense Transconductance GCS
Error Amplifier Tansconductance Gm
Oscillator Frequency
fSW
Short Circuit Oscillation Frequency
Maximum Duty Cycle
Minimum On-Time
Under Voltage Lockout Threshold
Ris ing
Under Voltage Lockout Threshold
H ysteresis
DMAX
tON
Test Conditions
Min
4.75V ≤ VIN ≤ 24V
0.902
--
--
VEN = 0V, VSW = 0V
--
Duty = 90%; 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
400
120
90
90
Max Unit
0.938
--
--
10
--
--
1220
--
V
Ω
Ω
μA
A
A/V
μA/V
kHz
-- kHz
--
%
--
ns
3.8 4.2 4.5 V
-- 250 -- mV
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4
To be continued
DS8268-02 March 2011
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