RT5112
Parameter
Hysteresis Voltage of
UVLO
HWEN and BSTEN Low
Level Input Voltage
Symbol
UVLO_H
Test Conditions
Min
--
Typ
100
Max
--
Unit
mV
HWEN and BSTEN Control
V
IL
--
1.2
--
--
--
1
0.4
--
-
V
V
M
HWEN and BSTEN High
V
IH
Level Input Voltage
HWEN and BSTEN Pull
Down Resistor
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
R
EN
Step Down Buck Converter (V
IN_B
= 3.8V, C1 = C2 = 10F, L1 = 1H)
V
IN_B
V
OUT_BUCK
V
OUT_ACC_BUCK
f
SW_BUCK
R
ON_HG_BUCK
R
ON_LG_BUCK
D
MAX_BUCK
R
DIS_BUCK
OVP
_R_BUCK
All output range of V
OUT_BUCK
,
I
OUT
= I
OUT(MAX)
V
OUT_BUCK
= 1.1V, operating
under CCM
From VINB pin to LXB pin
From LXB pin to GNDB pin
2.5
0.6
--
2
2
--
--
--
80
--
--
--
12.5
--
2.5
150
70
--
100
V
OUT_
BUCK
5.5
3.3
--
2
3
200
140
100
140
--
V
V
mV
%
MHz
m
m
%
V
x 120%
V
OUT_
OVP
_F_BUCK
--
BUCK
--
V
x 109%
V
OUT_
UVP
_R_BUCK
--
BUCK
--
V
x 92%
V
OUT_
UVP
_F_BUCK
Buck disable, 0x0B[7] = 0 (Buck
discharge disable), V
IN_B
= 5.5V,
V
LXB
= 5.5V, V
FB1
= 5.5V
Buck disable, 0x0B[7] = 0 (Buck
discharge disable), V
IN_B
= 5.5V,
V
LXB
= 0 or 5.5V
--
BUCK
--
V
x 80%
I
FB_LK
0
50
100
nA
FB1 Leakage Current
Switch Leakage Current
I
LXB_LK
0
--
1
A
Copyright
©
2019 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
6
DS5112-03 August 2019
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
