EV5424-R-00A datasheet(37/44 Pages) MPS

37 / 44 page

MP5424

– 5V POWER MANAGEMENT IC WITH I2C AND MTP

MP5424 Rev. 1.0

MonolithicPower.com

12/6/2021

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

APPLICATION INFORMATION

Selecting the Inductor

Optimized Performance with

MPS Inductor MPL-AL6050 Series

For most applications, use a 0.47µH to 2.2µH

inductor with a DC current rating at least 25%

greater

than

the

maximum

load

current

(ILOAD_MAX). For improved efficiency, use an

inductor with a DC resistance below

15mΩ. For

most designs, the inductance (L1) can be

calculated with Equation (1):

OUT

OSC

)

−

  

(1)

Where ∆IL is the inductor ripple current.

Choose the inductor ripple current to be

approximately 30% of ILOAD_MAX. The maximum

inductor peak current (IL(MAX)) can be estimated

with Equation (2):

LOAD

)

MAX

(



(2)

Choose an inductor with a higher inductance to

improve efficiency under light-load conditions

(<100mA).

MPS inductors are optimized and tested for use

with our complete line of integrated circuits.

Table

lists

MPS’s

power

inductor

recommendations for use with the MP5424.

Select a part number based on your design

requirements.

Table 3: Power Inductor Selection

Part Number

Inductance

Manufacturer

Select family

series (MPL-AL)

1µH to 1.5µH

MPS

MPL-AL6050-1R0

μH

MPS

MPL-AL6050-1R5

1.5μH

MPS

Visit MonolithicPower.com under Products >

Inductors for more information.

Selecting the

Step-Down Converter Input

Capacitor (C1)

The step-down converter has a discontinuous

input current (IIN), and requires a capacitor to

supply the AC current to the converter while

maintaining the DC VIN. Use low-ESR capacitors

for the best performance. Ceramic capacitors

with X5R or X7R dielectrics are recommended

due to their low ESR and small temperature

coefficients. For most applications, a 22µF

capacitor is sufficient.

Since the input capacitor (C1) absorbs the input

switching current, it requires an adequate ripple

current rating. The RMS current in C1 (IC1) can

be estimated with Equation (3):















−



OUT

LOAD

(3)

The worst-case condition occurs at VIN = 2 x VOUT,

which can be estimated with Equation (4):

LOAD

(4)

For simplification, choose C1 to have an RMS

current rating greater than half of ILOAD_MAX.

C1 can be electrolytic, tantalum, or ceramic. If

using electrolytic or tantalum capacitors, add a

small, high-quality ceramic capacitor (

0.1μF)

placed as close to the IC as possible. If using

ceramic capacitors, ensure that they have

enough capacitance to provide sufficient charge

to prevent excessive voltage ripple at the input.

The input voltage ripple

(∆VIN) caused by the

capacitance can be calculated with Equation (5):

LOAD

OUT







 −







(5)

Selecting the Step-Down Converter Output

Capacitor (C2)

The output capacitor (C2) for the step-down

converter maintains the DC VOUT. C2 can be

ceramic, tantalum, or electrolytic. For the best

results, use low-ESR capacitors to keep the

output voltage ripple (

∆VOUT) low. For most

applications, two 22µF ceramic capacitors are

sufficient .

∆VOUT can be estimated with Equation (6):

OUT

ESR

8 f







−







 

(6)

Where RESR is the equivalent series resistance

(ESR) value of C2.

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