RT6257A/B
Parameter
Feedback Voltage
Feedback Voltage
Feedback Current
Internal MOSFET
Switch-On Resistance
Discharge FET R
ON
Current Limit
Hide-Side Switch Current Limit
I
LIM_H
--
6.3
400
V
IN
= V
IN(MAX)
--
--
--
--
UVP detect
Hysteresis
--
--
11
8.5
500
60
200
150
15
60
10
--
10.7
600
--
--
--
--
--
--
A
A
kHz
ns
ns
C
C
%
%
Low-Side Switch Valley Current Limit I
LIM_L
Switching Frequency
Switching Frequency
On-Time Timer Control
Minimum On-Time
Minimum Off-Time
Thermal Shutdown
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
Output Under Voltage
UVP Trip Threshold
T
SD
T
SD
t
ON(MIN)
t
OFF(MIN)
f
SW
High-Side
Low-Side
R
DS(ON)_H
R
DS(ON)_L
R
DISCHG
V
BOOT
V
LX
= 4.8V
--
--
--
30
20
50
--
--
--
m
m
V
FB
I
FB
V
FB
= 4V
0.594
50
0.6
--
0.606
50
V
nA
Symbol
Conditions
Min
Typ
Max
Unit
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.
θ
JA
is measured in the natural convection at T
A
= 25°C on a four-layer Richtek Evaluation Board.
Note 3.
Devices are ESD sensitive. Handling precaution is 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.
DS6257A/B-03 October
2018
www.richtek.com
7
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
