RT5112A
Functional Pin Description
Pin No.
A1
A2
Pin Name
LXB1
VINB1
Pin Function
Buck1 switch output. Connect with a wide PCB trace.
Supply voltage input of Buck1. The IC operates from a 2.5V to 5.5V input rail.
Requires a 10F ceramic capacitor to decouple the input rail. Connect using a
wide PCB trace.
Supply voltage input of Buck2. The IC operates from a 2.5V to 5.5V input rail.
Requires a 10F ceramic capacitor to decouple the input rail. Connect using a
wide PCB trace.
Buck2 switch output. Connect with a wide PCB trace.
Buck1 power ground.
Feedback of Buck1. Directly connect the Buck1’s output to this pin.
This pin should connect to ground.
Interrupt output. Open drain output. When interrupt happens, interrupt pin is
pulled down.
Buck2 power ground.
Feedback of Buck2. Directly connect the Buck2’s output to this pin.
Chip enable control input.
Digital ground.
I
2
C data pin.
I
2
C clock signal input.
LDO4 power supply input. Requires a 2.2F ceramic capacitor to decouple the
input rail.
LDO3 power supply input. Requires a 2.2F ceramic capacitor to decouple the
input rail.
System analog power supply. Requires a 1uF ceramic capacitor to decouple
the input rail. It also connected to V
INB
externally.
Internal reference output, require a 10nF decouple capacitor.
LDO1 and 2 power supply input. Requires a 2.2F ceramic capacitor to
decouple the input rail.
LDO4 output. Requires a 2.2F ceramic decouple capacitor.
LDO3 output. Requires a 2.2F ceramic decouple capacitor.
Analog ground.
LDO2 output. Requires a 2.2F ceramic decouple capacitor.
LDO1 output. Requires a 2.2F ceramic decouple capacitor.
A3
A4, A5
B1
B2
B3
B4
B5
C1
C2
C3
C4
C5
D1
D2
D3
D4
D5
E1
E2
E3
E4
E5
VINB2
LXB2
GNDB1
FB1
NC
INTRB
GNDB2
FB2
HWEN
DGND
SDA
SCL
VIN4
VIN3
VSYS
REF
VIN12
LDO4
LDO3
AGND
LDO2
LDO1
Copyright
©
2019 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS5112A-02 August 2019
www.richtek.com
3
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
