RT7252A Datasheet, PDF (4/14 Pages) Richtek Technology Corporation – 2A, 17V, 340/800kHz Synchronous Step-Down Converter

RT7252A/B
Absolute Maximum Ratings (Note 1)
z Supply Voltage, VIN ----------------------------------------------------------------------------------------- −0.3V to 19V
z SW --------------------------------------------------------------------------------------------------------------- −0.3V to (V_IN + 0.3V)
z BOOT ----------------------------------------------------------------------------------------------------------- (SW − 0.3V) to (SW + 0.3V)
z All Other Pins ------------------------------------------------------------------------------------------------- −0.3V to 6V
z Power Dissipation, P_D @ T_A = 25°C
SOP-8 (Exposed Pad) -------------------------------------------------------------------------------------- 1.333W
z Package Thermal Resistance (Note 2)
SOP-8 (Exposed Pad), θ_JA --------------------------------------------------------------------------------- 75°C/W
SOP-8 (Exposed Pad), θ_JC -------------------------------------------------------------------------------- 15°C/W
z Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------ 260°C
z Junction Temperature ---------------------------------------------------------------------------------------- 150°C
z Storage Temperature Range ------------------------------------------------------------------------------- −65°C to 150°C
z ESD Susceptibility (Note 3)
HBM (Human Body Model) --------------------------------------------------------------------------------- 2kV
MM (Machine Model) ---------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions (Note 4)
z Supply Input Voltage, VIN ---------------------------------------------------------------------------------- 4V to 17V
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
Test Conditions
Min Typ Max Unit
Shutdown Supply Current
Supply Current
Feedback Voltage
Feedback Current
High Side Switch On
Resistance
Low Side Switch On
Resistance
I_SHDN
I_OUT
V_FB
I_FB
V_EN = 0V
V_EN = 3V, V_FB = 0.9V
4V ≤ V_IN ≤ 17V
V_FB = 0.8V
R_DS(ON)1
R_DS(ON)2
--
1
5
μA
--
0.6
1
mA
0.788 0.8 0.812 V
--
10
--
nA
-- 155 -- mΩ
-- 150 -- mΩ
Upper Switch Current Limit
Min. Duty Cycle, V_BOOT − V_SW = 4.8V
Maximum Loading = 2A
--
3.6
--
A
Lower Switch Current Limit
From Drain to Source
--
1
--
A
Oscillation Frequency
f_OSC1
For RT7252A
For RT7252B
300 340 380
kHz
700 800 900
Short-Circuit Oscillation
Frequency
Maximum Duty Cycle
f_OSC2
D_MAX
V_FB = 0V, For RT7252A
V_FB = 0V, For RT7252B
V_FB = 0.7V, For RT7252A
V_FB = 0.7V, For RT7252B
--
95
--
kHz
-- 170 --
--
93
--
%
--
84
--
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
www.richtek.com
4
is a registered trademark of Richtek Technology Corporation.
DS7252A/B-01 April 2012