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, P
D
@ T
A
= 25C
TSOT-23-8 --------------------------------------------------------------------------------------------------------------
0.68W
Package Thermal Resistance
(Note 2)
TSOT-23-8,
JA
--------------------------------------------------------------------------------------------------------
145.5C/W
TSOT-23-8,
JC
--------------------------------------------------------------------------------------------------------
13.6C/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
(V
IN
= 12V, T
A
= 25C, unless otherwise specified)
Parameter
Supply Current (Shutdown)
Supply Current (Quiescent)
Switch-On Resistance
Current Limit
Oscillator Frequency
Maximum Duty Cycle
Minimum On-Time
Feedback Threshold Voltage
Enable Input Voltage
Logic-Low
High-Side
Low-Side
I
Q
Symbol
I
SHDN
R
DS(ON)_H
R
DS(ON)_L
I
LIM
f
SW
D
MAX
t
ON_MIN
V
FB
V
EN_L
V
UVLO
Logic-High V
EN_H
Test Conditions
V
EN
= 0V
V
EN
= 2V, V
FB
= 1V
VBST
SW
= 4.8V
PVIN = 5V
Valley current
Min
--
--
--
--
1.7
--
--
--
591
1.5
--
3.55
Typ
--
0.5
230
130
2.2
500
90
60
600
--
--
3.9
Max
12
--
--
--
2.8
--
--
--
609
--
0.4
4.25
Unit
A
mA
m
A
kHz
%
ns
mV
V
V
VIN Under-Voltage Lockout
Threshold-Rising
Copyright © 2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DS7255-01
November 2017
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
