RT6228A/B/C
Parameter
Ultra-Sonic Mode
Normal Mode
Output Voltage
Output Voltage Setpoint
VCC Regulator Voltage
Feedback Voltage
Feedback Reference Voltage
Feedback Current
On Resistance
High-Side Switch On Resistance
Low-Side Switch On Resistance
Discharge FET Ron
Current Limit
Bottom FET Current Limit
Bottom FET Current Limit
ILMT Rising Threshold
ILMT Falling Threshold
Oscillator Frequency
Oscillator Frequency
On-Time Timer Control
Minimum On-Time
Minimum Off-Time
Minimum Off-Time
Ultrasonic Mode
Operation Period
Soft-Start
Soft-Start Time
Output Rising Time
UVLO
Input UVLO Threshold
UVLO Hysteresis
V
UVLO
V
HYS
Wake up RT6228A/B
Wake up RT6228C
--
--
--
--
--
0.3
4.5
5.4
--
V
V
t
SS
t
R
From EN high to PGOOD high
From 10% to 90% VOUT
1.3
--
1.65
0.6
2
--
ms
ms
t
USM
20
30
40
s
t
ON_MIN
t
OFF_MIN
t
OFF_MIN
V
IN
= V
IN(MAX)
RT6228A
RT6228B/C
40
300
150
50
400
200
80
600
300
ns
ns
ns
f
OSC
RT6228A/B
RT6228C
0.42
0.62
0.5
0.75
0.58
0.9
MHz
MHz
I
LIM
I
LIM
V
ILMTH
V
ILMTL
RT6228C
ILMT = ”0”
ILMT = Floating
ILMT = ”1”
RT6228A/B
9
8
10
12
V
CC
0.8
--
10.4
9.6
12
14.9
--
--
11.8
12
15
17.8
V
CC
0.8
A
A
V
V
R
DS(ON)_H
R
DS(ON)_L
R
DIS
14
8
40
20
10
50
26
12
63
m
m
V
REF
I
FB
(RT6228A)
V
FB
= 4V (RT6228A)
0.594
50
0.6
--
0.606
50
V
nA
V
OUT
V
CC
RT6228B
RT6228C
3.267
5.049
--
3.3
5.1
5
3.333
5.151
--
V
V
Symbol
V
EN
V
EN
Test Conditions
Min
2.3
--
Typ
--
--
Max
--
1.7
Unit
V
V
Copyright
©
2018 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS6228A/B/C-02
September 2018
www.richtek.com
7
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
