RT7250A/B
Absolute Maximum Ratings
(Note 1)
Supply Voltage, VIN ------------------------------------------------------------------------------------------------
−0.3V
to 19V
SW ----------------------------------------------------------------------------------------------------------------------
−0.3V
to (V
IN
+ 0.3V)
BOOT to SW ---------------------------------------------------------------------------------------------------------
−0.3V
to 6V
All Other Pins --------------------------------------------------------------------------------------------------------
−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
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 Model) ---------------------------------------------------------------------------------------- 2kV
MM (Machine Model) ----------------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions
(Note 4)
Supply Input Voltage, VIN ----------------------------------------------------------------------------------------- 4V to 17V
Junction Temperature Range --------------------------------------------------------------------------------------
−40°C
to 125°C
Ambient Temperature Range --------------------------------------------------------------------------------------
−40°C
to 85°C
Electrical Characteristics
Parameter
Shutdown Supply Current
Supply Current
I
SHDN
I
OUT
(V
IN
= 12V, T
A
= 25°C, unless otherwise specified)
Symbol
V
EN
= 0V
Test Conditions
V
EN
= 3V, V
FB
= 0.9V
Min
--
--
0.788
--
--
--
--
--
300
700
--
--
--
--
Typ
1
0.6
0.8
10
155
150
3.6
1
340
800
95
170
93
84
Max
5
1
0.812
--
--
--
--
--
380
900
--
--
--
--
Unit
μA
mA
V
nA
mΩ
mΩ
A
A
kHz
kHz
%
Feedback Reference Voltage V
FB
4V
≤
V
IN
≤
17V
Feedback Current
I
FB
V
FB
= 0.8V
High Side Switch On
R
DS(ON)1
Resistance
Low Side Switch On
R
DS(ON)2
Resistance
Upper Switch Current Limit
Lower Switch Current Limit
Oscillation Frequency
Short-Circuit Oscillation
Frequency
Maximum Duty Cycle
f
OSC1
f
OSC2
D
MAX
Min. Duty Cycle, V
BOOT
−V
SW
= 4.8V
Maximum Loading = 2A
From Drain to Source
For RT7250A
For RT7250B
V
FB
= 0V, For RT7250A
V
FB
= 0V, For RT7250B
V
FB
= 0.7V, For RT7250A
V
FB
= 0.7V, For RT7250B
Copyright
©
2012 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology
To be continued
Corporation.
www.richtek.com
4
DS7250A/B-01 May 2012
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
