AS1170 datasheet(47/53 Pages) AMSOSRAM

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AS1170

Application information

Datasheet

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Table 22: Recommended output capacitor

Part number

code

Rated

voltage

Size

Manufacturer

GRM219R61A116U

10 µF ±10% > 4.2 µF @ 5 V

X5R

10 V

0805

Murata

GRM188R60J106ME84

10 µF ±20% > 4.2 µF @ 4 V

X5R

6.3 V

0603

(1.6x0.8x0.85 mm

max. 0.95 mm

height)

(1) Use only for VLED < 3.75 V.

If a different output capacitor is chosen, ensure similar ESR values and at least 4.2 µF

capacitance at 5 V output voltage.

10.1.3

Inductor LDCDC

The fast switching frequency (4 MHz) of the AS1170 allows for the use of small SMDs for the

external inductor. The saturation current ISATURATION should be chosen to be above the

maximum value of ILIMIT13. The inductor should have very low DC resistance (DCR) to reduce

the I²R power losses - high DCR values will reduce efficiency.

Table 23: Recommended inductor

Part number

DCR

ISATURATION

Size

Manufacturer

C3-P1.5R

1.5 µH

58 m

Ω

2.4 A @ 25°C,

2.0 A (1)

3x3x1.5 mm

(height is max.)

Mitsumi

LQM32PN1R0MG0

1.0 µH > 0.6 µH @ 3.0 A

60 m

Ω

3.0 A (2)

3.2x2.5x0.9 mm

max 1.0 mm height

Murata

LQM2HPN1R0MGC

1.0 µH > 0.6 µH @ 2.0 A

100 m

Ω

1.5 A (2.0 A) (3)

2.5x2.0x0.9 mm

max 1.00 mm

height

CIG32W1R0MNE

1.0 µH > 0.7 µH @ 2.7 A

> 0.6 µH @ 3.0 A

60 m

Ω

±25%

3.0 A

3.2x2.5 mm max

1.0 mm height

Samsung Electro-

Mechanics

NRH2412T1R0N

1.0 µH > 0.6 µH @ 2.5 A

77 m

Ω

2.5 A (4)

2.4x2.4x1.2 mm

(height is max.)

Taiyo Yuden

CKP3225N1R0M

1.0 µH > 0.6 µH @ 3.0 A

<60 m

Ω

3.0 A

3.2x2.5x0.9 mm

max 1.0 mm height

MAMK2520T1R0M

1.0 µH > 0.6µH @

2.75 A

45 m

Ω

3.0 A (5)

2.5x2.0x1.2 mm

height is max

13 Can be adjusted in I²C mode with register coil_peak (see Page 24).

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