Data Sheet

ADP2230

Rev. A | Page 15 of 18

APPLICATIONS INFORMATION

The ADP2230 is designed with a high 1.5 MHz to 2.5 MHz

operating frequency that enables the use of small chip inductors

and capacitors that are ideal for use in applications with solution

size constraints. The external component selection for the

ADP2230 application circuit is also driven by the input and

output operating requirements. Compatible components for the

application circuits in Figure 32 and Figure 33 are identified

using the recommended inductors in Table 6 and selection

guides in the following sections.

Figure 32. Typical Application Circuit Fixed Output Voltage

Figure 33. Typical Application Circuit Adjustable Output Voltage

SETTING THE OUTPUT VOLTAGE

The ADP2230 is available with 1.2 V/1.8 V, 1.2 V/3.3 V, or

1.8 V/3.3 V fixed output voltage pairs. For these options, the

output voltage is set by an internal resistive feedback divider,

and no external resistors are necessary to set the output, as

shown in Figure 32.

The ADP2230 is available with adjustable output voltage pairs

and can be configured for output voltages between 0.8 V and

Use the following equation to determine R1 and R2 for the

FB

OUT

V

R2

R1

V













 

 1

(3)

SELECTING THE INDUCTOR

The ADP2230 is designed for optimal performance with 2.2 μH

inductors that have favorable saturation currents and lower dc

resistances (DCR) for their given physical size. Other inductor

values are not recommended.

To ensure stable and efficient performance with the ADP2230,

select a compatible inductor with a sufficient current rating,

saturation current, and low DCR. The specifications and value

of the selected inductor affect efficiency, output ripple, transient

response, and the transition level between PSM/PWM.

Suggested inductors are shown in Table 6.

The saturation current of the selected inductor must be greater

tion. The maximum peak inductor current is the maximum

load current plus half the inductor ripple current determined by

the following equation:











 





2

)

(

L

MAX

LOAD

PK

I

I

I

(4)

The ripple current can be calculated as follows:























IN

OUT

SW

OUT

L

V

V

L

f

V

I

1

(5)

where:

L is the inductor value.

voltage.

EN1

EN2

PGND

(EPAD)

SYNC

SW1

VIN2

VIN1

AGND

10µF

10µF

L1

2

9

ADP2230/

ADP2231

1

SW2

10µF

L2

10

5

11

ON

OFF

4

7

6

ON

OFF

PWM

PSM/PWM

EN1

EN2

PGND

(EPAD)

SYNC

SW1

VIN2

VIN1

AGND

10µF

10µF

L1

2

9

1

SW2

10µF

L2

10

5

11

ON

OFF

4

7

6

ON

OFF

PWM

PSM/PWM

ADP2230/

ADP2231