RT5028
Parameter
Buck1 to Buck4
Input Voltage
V
INB
Buck1 I C Programmable per step 25mV
Output Voltage
V
OUTB
Buck2 I C Programmable per step 25mV
Buck3 I C Programmable per step 50mV
Buck4 I C Programmable per step 50mV
Consumption
Current
Efficiency Peak
Output Voltage
Accuracy
Output Voltage
Ripple
Output Voltage
Temperature
Coefficient
Switching
Frequency
Switching
Frequency Accuracy
Suggest Inductor
L
Buck
Buck1
Peak Current Limit
OCP
Buck2
Buck3
Buck4
Under-Voltage
Protection
UVP
VOUTB1S to VOUTB4S < 0.66 x (V
OUT
Target)
Buck1
Maximum Output
Current
I
MAX
Buck2
Buck3
Buck4
Output Transient
Response
High-Side
On-Resistance
Low-Side
On-Resistance
V
peak
R
pon
R
non
0.8A to 1.6A at 20μs, V
OUT
= 1.2V
Buck1 and Buck2
V
IN
= 3.7V
V
IN
= 3.7V
I
VINB
Eff
AUTO Mode I
OUT
= 0mA, Each Buck
V
OUT
= 1.2V, V
IN
= I
LOAD
= CCM
3.6V
I
LOAD
= 1mA
3.1V < V
IN
< 5.5V, As VOUTB1S to VOUTB4S
≥
1V.
1mA < I
OUT
< I
MAX
As VOUTB1S to VOUTB4S < 1V.
I
OUT
= 1mA, C
OUT
= 10μF, 2MHz
I
OUT
= 1A, C
OUT
= 10μF, 2MHz
2
2
2
2
Symbol
Test Conditions
Min
Typ
Max
Unit
3.3
0.7
0.7
0.7
0.7
10
--
--
−3
30
--
--
--
--
--
--
--
--
20
88
80
--
--
25
8
±100
--
--
--
2.2
4.4
4
3.7
4.1
66
--
--
--
--
--
150
110
5.5
1.8
1.8
V
V
3.6
3.6
40
--
--
3
30
--
--
--
2
10
%
20
--
5.8
5.2
4.8
5.3
76
--
--
--
--
4
250
160
%
mΩ
mΩ
A
%
A
μH
ppm/°C
MHz
μA
%
V
OUTAcc
V
Rip
%mV
mV
f
SW
I C Programmable
1MHz
<
f
SW
f
SW
≤
1MHz
2
0.43
−10
−20
--
3.1
2.8
2.6
2.8
56
2.4
2
1.6
2.0
−4
50
40
Copyright
©
2016 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS5028-02
September 2016
www.richtek.com
7
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
