RT5112A
Parameter
FB1 Leakage Current
Symbol
I
FB1_LK
Test Conditions
Buck1 disable, 0x0B[7] = 0
(Buck1 discharge disable), V
IN_B1
= 5.5V, V
LXB1
= 5.5V, V
FB1
= 5.5V
Buck1 disable, 0x0B[7] = 0
(Buck1 discharge disable), V
IN_B1
= 5.5V, V
LXB1
= 0 or 5.5V
2.5V
V
IN_B1
5.5V
V
IN_B1
= 3.6V
V
IN_B1
= 3.6V, CCM
V
IN_B1
= 3.6V, V
OUT_BUCK1
=
1.8V
V
IN_B1
= V
OUT_BUCK1
= 3.3V
Min
0
Typ
50
Max
100
Unit
nA
Switch Leakage Current
UG Peak Current Limit
LG Valley Current Limit
LG Negative Current
Limit
Minimum On Time
Minimum Off Time
Input Voltage Range
Output Voltage Range
Output Voltage Step
Output Voltage Accuracy
Switching Frequency
P-Channel MOSFET On
Resistance
N-Channel MOSFET On
Resistance
Maximum Duty Cycle
Output Discharge
Resistor
Over-Voltage Rising
Threshold Detection
Over-Voltage Falling
Threshold Detection
Under-Voltage Rising
Threshold Detection
Under-Voltage Falling
Threshold Detection
I
LXB1_LK
I
CL_peak_B1
I
CL_valley_B1
I
NCL_NEG_B1
t
MIN_ON_B1
t
MIN_OFF_B1
V
IN_B2
V
OUT_BUCK2
V
OUT_ACCBUCK2
f
SW_BUCK2
R
ON_HG_BUCK2
R
ON_LG_BUCK2
D
MAX_BUCK2
R
DIS_BUCK2
OVP
_R_BUCK2
0
1.5
1
0.5
167
20
2.5
0.6
--
--
2
1.5
--
200
40
--
--
12.5
--
2.5
95
100
--
100
V
OUT_
1
2.5
2
3
250
60
5.5
3.3
--
2
3
120
130
100
120
--
A
A
A
A
ns
ns
V
V
mV
%
MHz
m
m
%
V
Step Down Converter Buck2 (V
IN_B2
= 3.8V, C3 = C4 = 10F, L2 = 1H)
All output range of V
OUT_BUCK2
,
I
OUT
= I
OUT(MAX)
V
OUT_BUCK2
= 2.85V, operating
under CCM
From VINB2 pin to LXB2 pin
From LXB2 pin to GNDB2 pin
2
2
--
--
--
80
--
BUCK2
x 120%
V
OUT_
OVP
_F_BUCK2
--
BUCK2
--
V
x 109%
V
OUT_
UVP
_R_BUCK2
--
BUCK2
--
V
x 92%
V
OUT_
UVP
_F_BUCK2
--
BUCK2
--
V
x 80%
Copyright
©
2019 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS5112A-02 August 2019
www.richtek.com
7
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
