RT6278A/B
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
On Resistance
High-Side Switch On-Resistance RDS(ON)_H
Low-Side Switch On-Resistance RDS(ON)_L
--
--
--
24
12
50
--
--
--
m
m
Discharge FET Ron
RDISCHG
Current Limit
ILMT = ”0”
8
--
--
--
--
--
--
Bottom FET Current Limit
ILIM
ILMT = Floating
ILMT = ”1”
10
12
A
VCC
0.8
ILMT Rising Threshold
VILMTH
VILMTL
--
--
VCC
0.8
V
V
ILMT Falling Threshold
Oscillator Frequency
Oscillator Frequency
--
fOSC
--
0.5
--
MHz
On-Time Timer Control
Minimum On-Time
tON_MIN
VIN = VIN(MAX)
--
--
50
--
--
ns
ns
Minimum Off-Time
tOFF_MIN
400
Ultrasonic Mode
Operation Period
tUSM
20
30
40
s
Soft-Start
Power Good Enable Delay Time
Soft-Start Time
From EN high to PGOOD high
From 10% to 90% VOUT
1.3
--
1.65
0.4
2
ms
ms
tSS
--
UVLO
Input UVLO Threshold
UVLO Hysteresis
VUVLO
Wake up
--
--
--
4.4
--
V
V
VUVLO_HYS
0.3
Output Over-Voltage Protection
Output Over Voltage Threshold
Output Over Voltage Hysteresis
Output Over Voltage Delay Time
Output Under-Voltage Protection
Output Under Voltage Threshold
VOUT rising
115
--
120
3
125
--
%
%
--
20
--
s
VFB falling
--
--
--
60
20
--
--
--
%
s
Output Under Voltage Delay
Time
FB forced below UV threshold
From EN high
UV Blank Time
1.65
ms
Power Good
Power Good Threshold
Power Good Hysteresis
Power Good Delay Time
VOUT rising (Good)
88
--
90
15
10
92
--
%
%
--
--
s
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is a registered trademark of Richtek Technology Corporation.
www.richtek.com
6
DS6278A/B-01 May 2018
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
