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KTZ8866

January 2022 - Revision 04b

Page 34 of 37

Company Confidential

Capacitor Selection

Small size ceramic capacitors with low ESR are ideal for all applications. A 10µF input capacitor and a

4.7µF output capacitor are suggested. The voltage rating of these capacitors should exceed the maximum

possible voltage at the corresponding pins, and these capacitors should be as close as possible to the IC. Table

25 shows the recommended capacitor vendors.

Table 25. Recommended Capacitor Vendors

Manufacturer

Website

Murata

www.murata.com

AVX

www.avx.com

Taiyo Yuden

www.t-yuden.com

Inductor Selection

An inductor of 4.7µH to 10µH with low DCR can be selected for the boost converter. To decide the current rating

of the inductor required for the application, the following equation can be used to estimate the peak inductor

current IPEAK in continuous conduction mode (CCM):

where VOUT(MAX) is the maximum output voltage, VIN(MIN) is the minimum input voltage, IOUT(MAX) is the maximum

output current, FSW

is the boost converter’s switching frequency, L is the inductor value,

 is the boost converter’s

efficiency under that condition. Table 26 shows recommended inductors under different application conditions.

Table 26. Recommended Inductors

Value

(µH)

Manufacturer

Inductor Part Number

DCR

(Ω)

Saturation Current

(A)

EIA Size

(mm)

6.8

ECS INC.

ECS-MPI4040R4-6R8-R

0.091

3.2

4.0 x 4.0 x 1.8

6.8

CYNTEC

CMLB051H-6R8MS

0.125

3.4

5.4 x 5.2 x 1.8

Schottky Diode Selection

Using a schottky diode is recommended because of its low forward voltage drop and fast reverse recovery time.

The average current rating of the schottky diode should exceed the maximum output current, and its peak current

rating should exceed the peak inductor current. Its voltage rating should also exceed the OVP setting. Table 27

shows the recommended schottky diode.

Table 27. Recommended Schottky Diode

Application

Schottky Diode

Part Number

Forward Voltage

(V)

Forward Current

(A)

Reverse Voltage

(V)

Manufacturer

All

PMEG6010CEGWX

0.57

1

60

Nexperia

Capacitor Selection for Dual Output Bias

Small size ceramic capacitors with low ESR are ideal for all applications. A 10µF output capacitor at REG are

suggested. Higher capacitor values can be used to improve the load transient response. The voltage rating of

these capacitors should exceed the maximum possible voltage at the corresponding pins, and these capacitors

should be as close as possible to the IC.

















−





+





=

)

(

)

(

)

(

)

(

)

(

)

(

1

2

MAX

OUT

MIN

IN

SW

MIN

IN

MIN

IN

MAX

OUT

MAX

OUT

PEAK

V

V

F

L

V

V

I

V

I

