RT6254A/B
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Enable Voltage
Logic-High
Logic= Low
VEN_H
1.5
--
--
--
--
V
V
EN Input Voltage
VEN_L
0.4
Feedback Voltage
Feedback Voltage
Feedback Current
Internal MOSFET
VREF
IFB
0.594
0.6
--
0.606
50
V
VFB = 4V
50
nA
High-Side Switch-On Resistance
Low-Side Switch-On Resistance
Discharge FET RON
RDS(ON)_H VBOOT VLX = 4.8V
--
--
--
48
25
50
--
--
--
m
m
RDS(ON)_L
RDISCHG
Current Limit
Hide-Side Switch Current Limit
ILIM_H
--
10
--
A
A
Low-Side Switch Valley Current Limit ILIM_L
4.2
6.2
8.2
Switching Frequency
Oscillator Frequency
fSW
400
500
600
kHz
On-Time Timer Control
Minimum On-Time
tON(MIN)
VIN = VIN(MAX)
--
--
60
--
--
ns
ns
Minimum Off-Time
tOFF(MIN)
200
Thermal Shutdown
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
Output Under Voltage
TSD
--
--
150
15
--
--
C
C
TSD
UVP detect
Hysteresis
--
--
60
10
--
--
%
%
UVP Trip Threshold
Power Good for TSOT 23-8 (FC) Package
Power Good Threshold VPGOOD
FB rising
FB falling
85
80
90
85
95
90
%
%
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 in the natural convection at TA = 25°C on a Four-layer Richtek Evaluation Board. θJC is measured at the
lead 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 2017 Richtek Technology Corporation. All rights reserved.
©
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
6
DS6254A/B-02 March 2017
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
