RT7270
Parameter
Maximum Duty Cycle
Symbol
DMAX
Test Conditions
Min
--
Typ
93
100
--
Max
--
Unit
%
VFB = 0.7V
Minimum On Time
tON
VIH
VIL
--
--
ns
Logic-High
Logic-Low
2.7
--
18
0.4
4.5
EN Input Threshold
Voltage
V
--
Input Under Voltage Lockout Threshold VUVLO
VIN Rising
3.8
4.2
V
Input Under Voltage Lockout
ΔVUVLO
--
320
--
mV
Hysteresis
Soft-Start Current
Soft-Start Period
Thermal Shutdown
ISS
tSS
TSD
VSS = 0V
--
--
--
6
--
--
--
μA
ms
°C
CSS = 0.1μF
15.5
150
Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in
the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may
affect device reliability.
Note 2. θJA is measured at TA = 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. θJC is
measured at the exposed pad of the package.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
Copyright 2012 Richtek Technology Corporation. All rights reserved.
©
is a registered trademark of Richtek Technology Corporation.
DS7270-01 September 2012
www.richtek.com
5
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
