ADP1606/ADP1607

Data Sheet

APPLICATIONS INFORMATION

SETTING THE OUTPUT VOLTAGE

The ADP1606 is available with a 1.8 V fixed output voltage. The

output voltage is set by an internal resistive feedback divider,

and no external resistors are necessary.

The ADP1607 has an adjustable output voltage and can be

configured for output voltages between 1.8 V and 3.3 V. The

output voltage is set by a resistor voltage divider, R1, from the

R2 from FB to GND (see Figure 28). Resistances between 100 kΩ

and 1 MΩ are recommended.

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

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 ADP1606/ADP1607 are 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

ADP1606/ADP1607 are 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

ADP1606/ADP1607, take care 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 with Equation 2.

SW

IN

L

f

L

D

V

I

×

×

=

∆

(2)

where:

D is the duty cycle of the application.

L is the inductor value.

The duty cycle (D) can be determined with Equation 3.

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 7. 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

Rev. D | Page 12 of 16