RT8272
Function Block Diagram
VIN
V
CC
1µA
EN
10k
VA V
CC
-
+
1V
Shutdown
Comparator
V
CC
10µA
SS
+
+
EA
-
Gm = 680µA/V
0.92V
Foldback
Control
0.5V
+
-
UV
Comparator
Internal
Regulator
Oscillator
1.2MHz/440kHz
Current Sense
Slope Comp Amplifier
+
-
VA
BOOT
SW
3V
+
-
Current
Comparator
Logic
GND
FB
COMP
Absolute Maximum Ratings
(Note 1)
Supply Voltage, V
IN
-----------------------------------------------------------------------------------------
−0.3V
to 26V
Switching Voltage, SW -------------------------------------------------------------------------------------
−0.3V
to (V
IN
+
0.3V)
BOOT Voltage ------------------------------------------------------------------------------------------------ (V
SW
−
0.3V) to (V
SW
+
6V)
All Other Pins Voltage --------------------------------------------------------------------------------------
−0.3V
to 6V
Power Dissipation, P
D
@ T
A
= 25°C
SOP-8 (Exposed Pad) -------------------------------------------------------------------------------------- 1.333W
Package Thermal Resistance (Note 2)
SOP-8 (Exposed Pad),
θ
JA
-------------------------------------------------------------------------------- 75°C/W
Junction Temperature --------------------------------------------------------------------------------------- 150°C
Lead Temperature (Soldering, 10 sec.) ----------------------------------------------------------------- 260°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 Voltage, V
IN
----------------------------------------------------------------------------------------- 4.75V to 24V
Enable Voltage, V
EN
----------------------------------------------------------------------------------------- 0V to 5.5V
Junction Temperature Range ------------------------------------------------------------------------------
−
40°C to 125°C
Ambient Temperature Range ------------------------------------------------------------------------------
−
40°C to 85°C
DS8272-02 March 2011
www.richtek.com
3
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
