RT8270 Ver la hoja de datos (PDF) - Richtek Technology
Número de pieza
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RT8270 Datasheet PDF : 12 Pages
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RT8270
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 All Other Voltage --------------------------------------------------------------------------------------------- −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 ----------------------------------------------------------------------------------------- 4.75V to 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
R DS(ON)1
R DS(ON)2
Current Limit
ILIM
Current Sense Transconductance GCS
Error Amplifier Tansconductance Gm
Oscillator Frequency
fSW
Short Circuit Oscillation Frequency
Maximum Duty Cycle
D MA X
Minimum On-Time
tON
Under Voltage Lockout Threshold
Ris ing
Under Voltage Lockout Threshold
Hysteresis
En input Low Voltage
En input High Voltage
Enable Pull Up Current
Test Conditions
Min Typ Max Unit
4.75V ≤ VIN ≤ 22V
1.184 1.222 1.258 V
-- 0.18 --
Ω
--
VEN = 0V, VSW = 0V
--
Duty = 90%; VBOOT−SW = 4.8V --
Output Current to VCOMP
--
ΔIC = ±10μA
--
--
10 --
Ω
--
10 μA
3
--
A
2.5 -- A/V
780 -- μA/V
1.2 -- MHz
VFB = 0V
VFB = 0.8V
-- 440 -- kHz
--
80 --
%
--
100 --
ns
4
4.2 4.5 V
-- 300 -- mV
--
-- 0.4 V
1.4
--
--
V
--
1
-- μA
DS8270-01 March 2011
To be continued
www.richtek.com
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