LM3559 datasheet(38/50 Pages) TI1

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PEAK

LOAD

+ '

where

L =

IN x

(

)

OUT - V

OUT

LM3559

SNVS624B – JUNE 2011 – REVISED JUNE 2016

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Table 20. Recommended Input/Output Capacitors (X5r Dielectric)

MANUFACTURER

PART NUMBER

VALUE

CASE SIZE

VOLTAGE RATING

TDK Corporation

C1608JB0J106M

10 µF

0603 (1.6 mm × 0.8 mm × 0.8 mm)

6.3 V

TDK Corporation

C2012JB1A106M

10 µF

0805 (2 mm × 1.25 mm ×1.25 mm)

10 V

TDK Corporation

C2012JB0J226M

22 µF

0805 (2 mm × 1.25 mm ×1.25 mm)

6.3 V

Murata

GRM188R60J06M

10 µF

0603 (1.6 mm × 0.8 mm × 0.8 mm)

6.3 V

Murata

GRM21BR61A106KE19

10 µF

0805 (2 mm ×1.25 mm × 1.25 mm)

10 V

Murata

GRM21BR60J226ME39L

22 µF

0805 (2 mm ×1.25 mm ×1.25 mm)

6.3 V

9.2.1.2.3

Inductor Selection

The LM3559 is designed to use a 1-µH or 2.2-µH inductor. Table 21 lists various inductors and their

manufacturers that can work well with the LM3559. When the device is boosting (VOUT > VIN) the inductor

typically is the largest area of efficiency loss in the circuit. Therefore, choosing an inductor with the lowest

possible series resistance is important. Additionally, the saturation rating of the inductor must be greater than the

maximum operating peak current of the LM3559. This prevents excess efficiency loss that can occur with

inductors that operate in saturation and prevents overheating of the inductor and further efficiency loss. For

proper inductor operation and circuit performance ensure that the inductor saturation and the peak current limit

setting of the LM3559 is greater than IPEAK in Equation 3:

where

•

ƒSW = 2 MHz

•

Efficiency can be found in Typical Characteristics

(3)

Table 21. Recommended Inductors

MANUFACTURER

PART NUMBER

DIMENSIONS (L×W×H)

ISAT

RDC

TOKO

2.2 µH

FDSD0312-H-2R2M

3 mm × 3.2 mm × 1.2 mm

2.3 A

105 m

Ω

TOKO

1 µH

FDSD0312-H-1R0M

3 mm × 3.2 mm × 1.2 mm

3.4 A

43 m

Ω

TOKO

1.5 µH

FDSD0312-H-1R5M

3 mm × 3.2 mm × 1.2 mm

2.8 A

71 m

Ω

TOKO

2.2 µH

FDSD0312-2R2M

3 mm × 3.2 mm × 1.2 mm

2.3 A

145 m

Ω

TOKO

1 µH

FDSD0312-1R0M

3 mm × 3.2 mm × 1.2 mm

3.4 A

70 m

Ω

TDK

1 µH

VLS4012ET-1R0N

4 mm × 4 mm × 1.2 mm

2.8 A

50 m

Ω

TDK

2.2 µH

VLS252012T-2R2M1R3

2 mm × 2.5 mm × 1.2 mm

1.5 A

130 m

Ω

LM3559 Datasheet(PDF) 38 Page - Texas Instruments

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