ADP1607

Data Sheet

Rev. C | Page 12 of 16

APPLICATIONS INFORMATION

SETTING THE OUTPUT VOLTAGE

The ADP1607 can be configured for output voltages between

1.8 V and 3.3 V. The output voltage is set by a resistor voltage

feedback input at FB and R2 from FB to GND (see Figure 24).

Resistances between 100 kΩ and 1 MΩ are recommended.

For larger R1 and R2 values, the voltage drop due to the FB pin

needs to be factored in.

use the following equation to determine R1 and R2 for the

)

(

1

R1

I

V

R2

R1

V

FB

FB

OUT

+











 +

=

(1)

where:

INDUCTOR SELECTION

The ADP1607 is designed with a 2 MHz operating frequency

enabling the use of small chip inductors ideal for use in

applications with limited solution size constraints. The

ADP1607 is designed for optimal performance with 2.2 µH

inductors, which have favorable saturation currents and lower

series resistances for their given physical size.

To ensure stable and efficient performance with the ADP1607,

care should be taken to select a compatible inductor with a

sufficient current rating, saturation current, and low dc

resistance (DCR.)

The maximum rated rms current of the inductor must be

greater than the maximum input current to the regulator.

Likewise, the saturation current of the chosen inductor must be

able to support the peak inductor current (the maximum input

current plus half the inductor ripple current) of the application.

mode can be calculated as

SW

IN

L

f

L

D

V

I

×

×

=

∆

(2)

where:

D is the duty cycle of the application.

L is the inductor value.

OUT

IN

OUT

V

V

V

D

−

=

(3)

Inductors with a low DCR minimize power loss and improve

efficiency. DCR values below 100 mΩ are recommended.

Table 5. 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

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

VLF302515MT-2R2M

2.2 ± 20%

42

2.71

1.57

3.00 × 2.50 × 1.40

Murata

LQM2HPN2R2MG0

2.2 ± 20%

80

1.30

2.50 × 2.00 × 0.90

1008

LQH32PN2R2NNC

2.2 ± 30%

64

1.85

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

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

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

DEM2815C (1226AS-H-2R2M)

2.2 ± 20%

43

1.40

2.20

3.20 × 3.00 × 1.50

Coilcraft

XFL3012-222

2.2 ± 20%

81

1.9

1.6

3.00 × 3.00 × 1.20

1212

XFL4020-222

2.2 ± 10%

21

8.0

3.1

4.00 × 4.00 × 2.10

1515