ADP2230

Data Sheet

Table 6. Suggested Inductors

Manufacturer

Part Number

Inductance

(µH)

DCR (mΩ)

Typ

Current

Rating (A)

Saturation

Current (A)

Size (L × W × H) (mm)

Package

TDK

MLP2016S2R2M

2.2 ± 20%

110

1.20

N/A

2.00 × 1.60 × 1.00

0806

MLP2520S2R2S

2.2 ± 20%

110

1.20

1.20

2.50 × 2.00 × 1.00

1008

VLF252012MT-2R2M

2.2 ± 20%

57

1.67

1.04

2.50 × 2.00 × 1.00

1008

VLF302510MT-2R2M

2.2 ± 20%

70

1.23

1.37

3.00 × 2.50 × 1.00

N/A

VLF302515MT-2R2M

2.2 ± 20%

42

2.71

1.57

3.00 × 2.50 × 1.40

N/A

Murata

LQM2HPN2R2MG0

2.2 ± 20%

80

1.30

N/A

2.50 × 2.00 × 0.90

1008

LQH32PN2R2NNC

2.2 ± 30%

64

1.85

N/A

3.20 × 2.50 × 1.55

1210

Wurth

74479787222

2.2 ± 20%

80

1.50

0.70

2.50 × 2.00 × 1.00

1008

7440430022

2.2 ± 30%

23

2.50

2.35

4.80 × 48.0 × 2.80

N/A

Taiyo Yuden

BRC2012T2R2MD

2.2 ± 20%

110

1.00

1.10

2.00 × 1.25 × 1.40

0805

Toko

MDT2520-CR2R2M

2.2 ± 20%

90

1.35

N/A

2.50 × 2.00 × 1.00

1008

DEM2810C (1224AS-H-2R2M)

2.2 ± 20%

85

1.10

1.40

3.20 × 3.00 × 1.00

N/A

DEM2815C (1226AS-H-2R2M)

2.2 ± 20%

43

1.40

2.20

3.20 × 3.00 × 1.50

N/A

Coilcraft

XPL2010-222

2.2 ± 20%

156

0.96

0.94

1.90 × 2.00 × 1.00

N/A

XFL3010-222

2.2 ± 20%

111

1.0

0.94

3.00 × 3.00 × 1.00

N/A

XFL3012-222

2.2 ± 20%

81

1.40

1.00

3.00 × 3.00 × 1.30

1212

1

N/A means not applicable.

SELECTING THE INPUT AND OUTPUT CAPACITORS

The ADP2230 is designed for optimal performance with 10 µF

capacitors. Use any size, good quality, low ESR, X5R or X7R

ceramic capacitors with the ADP2230, as long as they meet

the capacitance and voltage requirements of the application.

Capacitors less than 10 µF are not recommended.

Input Capacitor

The ADP2230 is designed to operate with a single 10 µF input

maximum input operating voltage and the maximum rms input

current.

Place the input capacitor as close as possible to the VINx pins

to reduce input voltage ripple. Select an input capacitor capable

of withstanding the rms input current for the maximum

continuous load current in the application using the following

equation:

(

)

IN

OUT

IN

OUT

MAX

OUT

RMS

V

V

V

V

I

I

−

×

×

≈

)

(

(6)

The input capacitor reduces the input voltage ripple caused by

the switch currents on the VINx pin and reduces the circuit

sensitivity to the PCB layout, especially when long input traces or

high source impedance are encountered.

Output Capacitor

with one capacitor on each buck output. The output capacitor

stability of the control loop.

The ADP2230 is designed for operation with small, space

saving ceramic capacitors, but function with most commonly

used capacitors as long as care is taken to calculate the effective

ESR value. Capacitors with low ESR values produce the lowest

output voltage ripple. A capacitor with an ESR between 0.001 Ω

and 0.01 Ω is recommended to ensure stability of the ADP2230.

following equation:

L

OUT

MAX

C

I

V

ESR

OUT

∆

∆

<

)

(

(7)

calculated in Equation 8.

The overall output voltage ripple is the sum of the voltage spike

caused by the output capacitor ESR plus the voltage ripple caused

by charging and discharging the output capacitor. The output

voltage ripple is determined by the following equation:

(8)

where:

The largest voltage ripple occurs at the highest input voltage.

At light load currents, if SYNC is set low, the converter operates

in PSM, and the output voltage ripple increases.

To improve the transient response of the ADP2230, increase the

Rev. A | Page 16 of 18