RT8251
Function Block Diagram
VIN
V
CC
1µA
EN
10k
1.1V
3V
VA V
CC
-
+
Shutdown
Comparator
0.4V
Foldback
Control
+
+
-
Current
Comparator
Logic
Internal
Regulator
Oscillator
570kHz
Current Sense
Slope Comp Amplifier
+
-
BOOT
SW
VA
V
CC
10µA
SS
-
UV
Comparator
GND
+
+
EA
-
Gm = 820µA/V
0.8V
FB
COMP
Absolute Maximum Ratings
(Note 1)
Supply Voltage, V
IN
------------------------------------------------------------------------------------------
−0.3V
to 26V
Switching Voltage, V
SW
-------------------------------------------------------------------------------------
−0.3V
to (V
IN
+
0.3V)
BOOT Voltage, V
BOOT
--------------------------------------------------------------------------------------- (V
SW
−
0.3V) to (V
SW
+
6V)
All Other Pins -------------------------------------------------------------------------------------------------
−0.3V
to 6V
Power Dissipation, P
D
@ T
A
= 25°C
WQFN-16L 3x3 ----------------------------------------------------------------------------------------------- 1.471W
SOP-8 (Exposed Pad) -------------------------------------------------------------------------------------- 1.333W
Package Thermal Resistance (Note 2)
WQFN-16L 3x3,
θ
JA
------------------------------------------------------------------------------------------ 68°C/W
WQFN-16L 3x3,
θ
JC
----------------------------------------------------------------------------------------- 7.5°C/W
SOP-8 (Exposed pad),
θ
JA
--------------------------------------------------------------------------------- 75°C/W
SOP-8 (Exposed Pad),
θ
JC
-------------------------------------------------------------------------------- 15°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 Model) --------------------------------------------------------------------------------- 2kV
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
Copyright
©
2013 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DS8251-04 February 2013
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
