RT5112A
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Buck1 disable, 0x0B[7] = 0
FB1 Leakage Current
0
50
100
nA
(Buck1 discharge disable), VIN_B1
= 5.5V, VLXB1 = 5.5V, VFB1 = 5.5V
Buck1 disable, 0x0B[7] = 0
IFB1_LK
Switch Leakage Current
(Buck1 discharge disable), VIN_B1
= 5.5V, VLXB1 = 0 or 5.5V
0
--
1
A
ILXB1_LK
2.5V
V
5.5V
UG Peak Current Limit
LG Valley Current Limit
1.5
1
2
2.5
2
A
A
IN_B1
ICL_peak_B1
ICL_valley_B1
1.5
VIN_B1 = 3.6V
LG Negative Current
Limit
0.5
--
3
A
INCL_NEG_B1
VIN_B1 = 3.6V, CCM
VIN_B1 = 3.6V, VOUT_BUCK1
1.8V
=
Minimum On Time
Minimum Off Time
167
20
200
40
250
60
ns
ns
tMIN_ON_B1
tMIN_OFF_B1
VIN_B1 = VOUT_BUCK1 = 3.3V
Step Down Converter Buck2 (VIN_B2 = 3.8V, C3 = C4 = 10F, L2 = 1H)
Input Voltage Range
Output Voltage Range
Output Voltage Step
2.5
0.6
--
--
--
5.5
3.3
--
V
V
VIN_B2
VOUT_BUCK2
12.5
mV
All output range of VOUT_BUCK2
,
Output Voltage Accuracy
Switching Frequency
--
2
%
2
2
VOUT_ACCBUCK2
fSW_BUCK2
IOUT = IOUT(MAX)
VOUT_BUCK2 = 2.85V, operating
under CCM
2.5
95
3
MHz
m
P-Channel MOSFET On
Resistance
From VINB2 pin to LXB2 pin
From LXB2 pin to GNDB2 pin
--
120
RON_HG_BUCK2
N-Channel MOSFET On
Resistance
--
--
100
--
130
100
120
m
%
RON_LG_BUCK2
DMAX_BUCK2
RDIS_BUCK2
Maximum Duty Cycle
Output Discharge
Resistor
80
100
VOUT_
Over-Voltage Rising
Threshold Detection
--
--
--
--
--
--
--
--
V
V
V
V
OVP_R_BUCK2
OVP_F_BUCK2
UVP_R_BUCK2
UVP_F_BUCK2
BUCK2
x 120%
VOUT_
Over-Voltage Falling
Threshold Detection
BUCK2
x 109%
VOUT_
Under-Voltage Rising
Threshold Detection
BUCK2
x 92%
VOUT_
Under-Voltage Falling
Threshold Detection
BUCK2
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 ]
