RT5112A
HWEN
Fault
INTRB
MASK = 0
EVENT = 0
Status = 0
INT_CLS = 0
EVENT READ
MASK = 1
MASK = 0
MASK = 1
MASK=0
EVENT = 0
EVENT = 1
EVENT = 0
EVENT = 1
Status = 1
Status = 0
Status = 1
Status = 0
1
INT_CLS = 0
1
INT_CLS = 0
READ
READ
Figure 9.
IL
Component Selection
Inductor Selection
VOUT VESR VOUT1
8COUT fSW
V
ICOUT_RMS RCOUT_ESR
where
ESR
The recommended nominal inductance 1μH for Buck
converter. The inductor saturation current must be
chosen carefully considering the current limit level. It
is suggested to select an inductor with the low DCR to
provide good performance and efficiency for application.
LDOs
Like any low dropout regulator, the external capacitors
of the RT5112A must be carefully selected for
regulator stability and performance. Using a capacitor
of at least 2.2μF (X5R or X7R) is suitable.
Input and Output Capacitor Selection
It is recommended at least a 10μF (6.3V) input capacitor
for Buck, a 10μF (6.3V) output capacitor for Buck. The
ripple voltage is an important index for choosing output
capacitor. This portion consists of two parts. One is
the product of ripple current with the ESR of the output
capacitor, while the other part is formed by the charging
and discharging process of the output capacitor. The
output ripple can be calculated as below.
Copyright 2019 Richtek Technology Corporation. All rights reserved.
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is a registered trademark of Richtek Technology Corporation.
DS5112A-02 August 2019
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