RT8267 Datasheet, PDF (3/12 Pages) Richtek Technology Corporation – 2A, 22V, 400kHz Step-Down Converter

RT8267
Absolute Maximum Ratings (Note 1)
z Supply Voltage, V_IN ----------------------------------------------------------------------------------------- 23V
z Switching Voltage, SW ------------------------------------------------------------------------------------- −0.3V to (V_IN + 0.3V)
z BOOT Voltage ------------------------------------------------------------------------------------------------ (V_SW − 0.3V) to (V_SW + 6V)
z All Other Voltage --------------------------------------------------------------------------------------------- −0.3V to 6V
z Power Dissipation, P_D @ T_A = 25°C
SOP-8 ---------------------------------------------------------------------------------------------------------- 0.833W
z Package Thermal Resistance (Note 2)
SOP-8, θ_JA ---------------------------------------------------------------------------------------------------- 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, V_IN ----------------------------------------------------------------------------------------- 22V
z Enable Voltage, V_EN ----------------------------------------------------------------------------------------- 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
V_FB
R _DS(ON)1
R _DS(ON)2
Current Limit
I_LIM
Current Sense Transconductance G_CS
Error Amplifier Tansconductance G_m
Oscillator Frequency
f_SW
Short Circuit Oscillation Frequency
Maximum Duty Cycle
D _{MA X}
Minimum On-Time
t_ON
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
4.75V ≤ V_IN ≤ 22V
V_EN = 0V, V_SW = 0V
Duty = 90%; V_BOOT−SW = 4.8V
Output Current to V_COMP
ΔI_C = ±10μA
V_FB = 0V
V_FB = 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
320 400 460 kHz
-- 120 -- kHz
--
90 --
%
-- 100 --
ns
4
4.2 4.5 V
-- 300 -- mV
--
-- 0.4 V
1.4 --
--
V
--
1
-- μA
To be continued
DS8267-02 March 2011
www.richtek.com
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