RT6218A/B
Parameter
Enable Voltage
Enable Voltage Threshold
Enable Voltage Hysteresis
Feedback Voltage
Feedback Reference Voltage
Internal MOSFET
High-Side On-Resistance
Low-Side On-Resistance
Current Limit
Current Limit
Switching Frequency
Switching Frequency
On-Time Timer Control
Minimum On-Time
Minimum Off-Time
t
ON_MIN
t
OFF_MIN
UVP detect
Hysteresis
--
--
60
240
--
--
ns
f
SW
--
650
--
kHz
I
LIM
Valley current
2.5
3.2
--
A
R
DS(ON)_H
R
DS(ON)_L
V
BOOT
V
LX
= 4.8V
--
--
120
65
--
--
m
V
REF
4.5V
VIN
18V,
0.753
0.765
0.777
V
V
EN_R
VEN rising
1.32
--
1.43
0.18
1.55
--
V
V
Symbol
Test Conditions
Min
Typ
Max
Unit
Output Under-Voltage Protections
UVP Trip Threshold
Thermal Shutdown
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
Power Good
Power Good Threshold
VPGOOD
FB rising
FB falling
--
--
90
85
--
--
%
T
SD
T
SD
--
--
150
20
--
--
°C
°C
57.5
--
62.5
10
67.5
--
%
Note 1.
Stresses beyond those listed under “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.
JA
is measured under natural convection (still air) at T
A
= 25C with the component mounted on a high
effective-thermal-conductivity four-layer test board on a JEDEC 51-7 thermal measurement standard. The first layer is
filled with copper.
JA
is measured at the lead of the package.
Note 3.
Devices are ESD sensitive. Handling precaution recommended.
Note 4.
The device is not guaranteed to function outside its operating conditions.
Copyright © 2018 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS6218A/B-01
October
2018
www.richtek.com
7
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
