RT7248
Absolute Maximum Ratings
(Note 1)
Supply Voltage, VIN -----------------------------------------------------------------------------------------------
−0.3V
to 20V
Input Voltage, SW --------------------------------------------------------------------------------------------------
−0.3V
to (V
IN
+
0.3V)
V
BOOT
−
V
SW
---------------------------------------------------------------------------------------------------------
−0.3V
to 6V
Other Pins Voltages -----------------------------------------------------------------------------------------------
−0.3V
to 20V
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
SOP-8 (Exposed Pad),
θ
JC
--------------------------------------------------------------------------------------- 15°C
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, VIN ----------------------------------------------------------------------------------------------- 4.5V to 18V
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 Voltage
Symbol
Test Conditions
V
EN
= 0V
Min
--
--
0.909
--
--
--
Typ
0.5
0.8
0.923
940
150
130
0
4
3.7
340
100
93
100
Max
3
1.2
0.937
--
--
--
10
--
--
380
--
--
--
Unit
μA
mA
V
μA/V
mΩ
mΩ
μA
A
A/V
kHz
kHz
%
ns
I
CC
V
FB
R
DS(ON)1
R
DS(ON)2
V
EN
= 3 V, V
FB
= 1V
4.5V
≤
V
IN
≤
23V
ΔI
C
=
±10μA
Error Amplifier Transconductance G
EA
High Side Switch-On Resistance
Low Side Switch-On Resistance
High Side Switch Leakage Current
Upper Switch Current Limit
COMP to Current Sense
Transconductance
Oscillator Frequency
Short Circuit Oscillation
Frequency
Maximum Duty Cycle
Minimum On-Time
V
EN
= 0V, V
SW
= 0V
Min.Duty Cycle, V
BOOT−SW
= 4.8V
G
CS
f
OSC1
f
OSC2
D
MAX
V
FB
= 0V
V
FB
= 0.7V
--
--
--
300
--
--
--
t
ON
Copyright
©
2012 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DS7248-01
September 2012
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
