RT8290
Function Block Diagram
VIN
Internal
Regulator
Shutdown
Comparator
+
1.2V
5k
EN
3V
-
-
+
2.5V
Lockout
Comparator
V
CC
7µA
SS
0.925V
+
+ EA
-
0.5V
VA V
CC
Oscillator
Current Sense
Slope Comp Amplifier
+
-
Foldback
Control
+
+
-
Current
Comparator
R
Q
85mΩ
GND
BOOT
S
Q
100mΩ
SW
VA
-
UV
Comparator
FB
COMP
Absolute Maximum Ratings
(Note 1)
−0.3V
to 25V
−0.3V
to (V
IN
+
0.3V)
(V
SW
−
0.3V) to (V
SW
+
6V)
−0.3V
to 6V
1.333W
75°C/W
15°C/W
150°C
260°C
Supply Voltage, V
IN
------------------------------------------------------------------------------------------
Switching Voltage, SW -------------------------------------------------------------------------------------
BOOT Voltage -------------------------------------------------------------------------------------------------
The Other Pins ------------------------------------------------------------------------------------------------
Power Dissipation, P
D
@ T
A
= 25°C
SOP-8 (Exposed Pad) --------------------------------------------------------------------------------------
Package Thermal Resistance (Note 2)
SOP-8 (Exposed Pad),
θ
JA
---------------------------------------------------------------------------------
SOP-8 (Exposed Pad),
θ
JC
--------------------------------------------------------------------------------
Junction Temperature ----------------------------------------------------------------------------------------
Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------
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)
4.5V to 23V
0V to 5.5V
−40°C
to 125°C
−40°C
to 85°C
Supply Voltage, V
IN
------------------------------------------------------------------------------------------
Enable Voltage, V
EN
-----------------------------------------------------------------------------------------
Junction Temperature Range -------------------------------------------------------------------------------
Ambient Temperature Range -------------------------------------------------------------------------------
DS8290-02 March 2011
www.richtek.com
3
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
