RT5112
Component List of Evaluation Board
Reference
C1, C2, C3
C4
C5, C8, C12
C6, C7, C9, C10
C11
C13
L1
L2
Qty
1
1
1
1
1
1
1
1
Part Number
JMK105CBJ106MV-F
JMK107BBJ226MA-T
JMK105BJ225KV-F
GRM033R60J225ME47D
LMK105BJ103KV-F
LMK063BBJ105MPLF
MEKK2016T1R0M
DFE201210S-R47MH=P2
Description
10F/X5R/6.3V
22F/X5R/6.3V
2.2F/X5R/6.3V
2.2F/X5R/6.3V
10nF/X5R/6.3V
1F/X5R/10V
1H/3.1A/50m
0.47H/3.4A/32m
Package
0402
0603
0402
0201
0402
0201
2016
2012
Manufacturer
TAIYO YUDEN
TAIYO YUDEN
TAIYO YUDEN
MURATA
TAIYO YUDEN
TAIYO YUDEN
TAIYO YUDEN
MURATA
Functional Pin Description
Pin No.
A1
A2
Pin Name
LXB
VINB
Pin Function
Buck switch output. Connect this pin to an inductor with a wide PCB trace.
Supply voltage input of Buck. The IC operates from a 2.5V to 5.5V input rail. It
requires a 10F decouple ceramic capacitor. Connect this pin to input voltage
with a wide PCB trace.
Boost output pin. PCB trace length from BSTVOUT to the output filter capacitor
should be as short and wide as possible. It requires a 22F decouple ceramic
capacitor. BSTVOUT is completely disconnected from LXBST when Boost is at
off state.
Boost switch output. Connect this pin to an inductor with a wide PCB trace and
keep the PCB trace length as short and wide as possible to reduce EMI and
voltage spike.
Buck power ground.
Feedback of Buck. Directly connect the Buck’s output to this pin.
Boost enable control input.
Interrupt output. Open drain output. When interrupt happens, interrupt pin is
pulled down.
Boost power ground.
NC internal connection and should keep floating state.
Chip enable control input.
Digital ground.
I
2
C data pin.
I
2
C clock signal input.
LDO4 power supply input. It requires a 2.2F decouple ceramic capacitor.
LDO3 power supply input. It requires a 2.2F decouple ceramic capacitor.
System analog power supply. It requires a 1F decouple ceramic capacitor. It
also connected to V
INB
externally.
A3
BSTVOUT
A4, A5
B1
B2
B3
B4
B5
C1
C2
C3
C4
C5
D1
D2
D3
LXBST
GNDB
FB1
BSTEN
INTRB
GNDBST
NC
HWEN
DGND
SDA
SCL
VIN4
VIN3
VSYS
Copyright
©
2019 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS5112-03 August 2019
www.richtek.com
3
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