RT7274/79/80/81
Absolute Maximum Ratings
(Note 1)
Supply Input Voltage, VIN, VINR -------------------------------------------------------------------------------
−0.3V
to 21V
Switch Node, SW --------------------------------------------------------------------------------------------------
−0.8V
to (V
IN
+ 0.3V)
Switch Node, SW (<10ns) ----------------------------------------------------------------------------------------
−5V
to 25V
BOOT to SW, PVCC ----------------------------------------------------------------------------------------------
−0.3V
to 6V
Other Pins ------------------------------------------------------------------------------------------------------------
−0.3V
to 21V
Power Dissipation, P
D
@ T
A
= 25°C
TSSOP-14 (Exposed Pad) --------------------------------------------------------------------------------------- 2.50W
SOP-8 (Exposed Pad) -------------------------------------------------------------------------------------------- 2.04W
Package Thermal Resistance (Note 2)
TSSOP-14 (Exposed Pad),
θ
JA
--------------------------------------------------------------------------------- 40°C/W
SOP-8 (Exposed Pad),
θ
JA
--------------------------------------------------------------------------------------- 49°C/W
SOP-8 (Exposed Pad),
θ
JC
-------------------------------------------------------------------------------------- 15°C/W
Junction Temperature Range ------------------------------------------------------------------------------------- 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 Input 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
Supply Current
Supply Current (Shutdown)
Supply Current (Quiescent)
Logic Threshold
EN Voltage
Logic High
Logic Low
Symbol
Test Conditions
V
EN
= 0V
V
EN
= 3V, V
FB
= 1V
Min
--
--
1.6
--
Typ
1
0.7
--
--
440
Max
10
--
18
0.4
880
Unit
μA
mA
V
IH
V
IL
V
EN
= 12V
V
kΩ
EN Pin Resistance to GND
(RT7274/81)
V
FB
Voltage and Discharge Resistance
Feedback Threshold Voltage
Feedback Input Current
VOUT Discharge Resistance
V
FB_TH
I
FB
R
DIS
220
4.5V
≤
V
IN
≤
18V
V
FB
= 0.8V
EN = 0V, V
VOUT
= 0.5V
0.757
−0.1
--
0.765 0.773
0
50
0.1
100
V
μA
Ω
Copyright
©
2013 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS7274/79/80/81-01
February 2013
www.richtek.com
9
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
