RT8298
Absolute Maximum Ratings
(Note 1)
Supply Input Voltage, V
IN
------------------------------------------------------------------------------------------
–0.3V
to 26V
Switching Voltage, SW --------------------------------------------------------------------------------------------
–0.3V
to (V
IN
+ 0.3V)
BOOT to SW ---------------------------------------------------------------------------------------------------------
–0.3V
to 6V
All Other Voltage ----------------------------------------------------------------------------------------------------
−0.3V
to 6V
Power Dissipation, P
D
@ T
A
= 25°C
WDFN-14L 4x3 ------------------------------------------------------------------------------------------------------- 1.667W
SOP-8 (Exposed Pad) --------------------------------------------------------------------------------------------- 1.333W
Package Thermal Resistance (Note 2)
WDFN-14L 4x3,
θ
JA
------------------------------------------------------------------------------------------------- 60°C/W
WDFN-14L 4x3,
θ
JC
------------------------------------------------------------------------------------------------- 7.5°C/W
SOP-8 (Exposed Pad),
θ
JA
---------------------------------------------------------------------------------------- 75°C/W
SOP-8 (Exposed Pad),
θ
JC
--------------------------------------------------------------------------------------- 15°C/W
Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------- 260°C
Junction Temperature ----------------------------------------------------------------------------------------------- 150°C
Storage Temperature Range --------------------------------------------------------------------------------------
–65°C
to 150°C
ESD Susceptibility (Note 3)
HBM (Human Body Mode) ---------------------------------------------------------------------------------------- 2kV
MM (Machine Mode) ------------------------------------------------------------------------------------------------ 200V
Recommended Operating Conditions
(Note 4)
Supply Input Voltage, V
IN
------------------------------------------------------------------------------------------ 4.5V to 24V
Junction Temperature Range --------------------------------------------------------------------------------------
−
40°C to 125°C
Ambient Temperature Range --------------------------------------------------------------------------------------
−
40°C to 85°C
Electrical Characteristics
(V
IN
= 12V, T
A
= 25°C, unless otherwise specified)
Parameter
Shutdown Supply Current
Supply Current
Feedback Reference Voltage
Feedback Current
High-Side Switch On Resistance
High-Side Switch Current Limit
Oscillation Frequency
Short Circuit Oscillation Frequency
Maximum Duty Cycle
Minimum On-Time
Input Under Voltage Lockout Threshold
Input Under Voltage Lockout Threshold
Hysteresis
EN Threshold
Voltage
Logic-High
Logic-Low
Symbol
Test Conditions
V
EN
= 0V
V
EN
= 3V, V
FB
= 1V
Min
--
--
--
--
--
--
--
--
--
4
--
2
--
Typ
1
0.9
10
45
10
600
190
90
100
4.2
400
--
--
Max
--
--
0.82
--
--
--
--
--
--
--
4.4
--
5.5
0.4
Unit
μA
mA
V
nA
mΩ
A
kHz
kHz
%
ns
V
mV
V
V
REF
I
FB
R
DS(ON)
4.5V
≤
V
IN
≤
24V
V
FB
= 0.8V
BOOT
−
SW = 4.8V
0.796 0.808
f
OSC1
f
OSC2
D
MAX
t
ON
V
UVLO
ΔV
UVLO
V
IH
V
IL
V
FB
= 0V
V
FB
= 0.6V
V
FB
= 1V
Copyright
©
2011 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS8298-01
November 2011
www.richtek.com
5
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
