RT7255
Absolute Maximum Ratings (Note 1)
VIN to GND -------------------------------------------------------------------------------------------------------------0.3V to 20V
SW to GND -------------------------------------------------------------------------------------------------------------0.3V to 20V
<10ns---------------------------------------------------------------------------------------------------------------------5V to 25V
BOOT to GND----------------------------------------------------------------------------------------------------------0.3V to 26V
BOOT to SW------------------------------------------------------------------------------------------------------------0.3V to 6V
Other Pins---------------------------------------------------------------------------------------------------------------0.3V to 6V
Power Dissipation, PD @ TA = 25C
SOT-23-8----------------------------------------------------------------------------------------------------------------0.53W
Package Thermal Resistance
(Note 2)
SOT-23-8, JA----------------------------------------------------------------------------------------------------------186.2C/W
SOT-23-8, JC----------------------------------------------------------------------------------------------------------47.4C/W
Lead Temperature (Soldering, 10 sec.)--------------------------------------------------------------------------260C
Junction Temperature------------------------------------------------------------------------------------------------150C
Storage Temperature Range---------------------------------------------------------------------------------------65C to 150C
ESD Susceptibility
(Note 3)
HBM (Human Body Model) -----------------------------------------------------------------------------------------2kV
Recommended Operating Conditions
(Note 4)
Supply Input Voltage -------------------------------------------------------------------------------------------------4.3V to 18V
Ambient Temperature Range---------------------------------------------------------------------------------------40C to 85C
Junction Temperature Range --------------------------------------------------------------------------------------40C to 125C
Electrical Characteristics
(VIN = 12V, TA = 25C, unless otherwise specified)
Parameter
Symbol
ISHDN
IQ
Test Conditions
VEN = 0V
Min Typ Max Unit
Supply Current (Shutdown)
Supply Current (Quiescent)
--
--
--
12
--
A
VEN = 2V, VFB = 1V
VBST SW = 4.8V
PVIN = 5V
0.5
230
130
2.2
500
90
mA
High-Side RDS(ON)_H
--
--
Switch-On Resistance
m
Low-Side RDS(ON)_L
--
--
Current Limit
ILIM
Vally Current
1.7
--
2.8
--
A
kHz
%
Oscillator Frequency
Maximum Duty Cycle
Minimum On-Time
fSW
DMAX
tON
VFB
--
--
--
60
--
ns
Feedback Threshold Voltage
591 600 609
mV
Logic-High VEN_H
Logic-Low VEN_L
1.5
--
--
--
--
Enable Input Voltage
V
V
0.4
VIN Under-Voltage Lockout
Threshold-Rising
VUVLO
3.55 3.9 4.25
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DS7255-00 June 2015
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