AAT1126IGV-0.6-T1 查看數據表（PDF） - Analog Technology Inc

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AAT1126IGV-0.6-T1

600mA, 1MHz Step-Down Converter

Analog Technology Inc 

AAT1126

600mA, 1MHz Step-Down Converter

Step-Down Converter Design Example

Specifications

VO = 1.8V @ 400mA (adjustable using 0.6V version), Pulsed Load ΔILOAD = 300mA

VIN = 2.7V to 4.2V (3.6V nominal)

FS

= 1.0MHz

TAMB = 85°C

1.8V Output Inductor

μsec

μsec

L1 = 3 A ⋅ VO2 = 3 A ⋅ 1.8V = 5.4μH

(see Table 1)

For Sumida inductor CDRH3D16, 4.7µH, DCR = 105mΩ.

ΔIL1 =

VO

L1 ⋅ F

⋅

⎛⎝1

-

VO ⎞

VIN ⎠

=

1.8V

4.7μH ⋅ 1.0MHz

⋅

1-

⎛

⎝

1.8V⎞

4.2V⎠

=

218mA

IPKL1

=

IO

+

ΔIL1

2

=

0.4A

+

0.11A

=

0.51A

PL1 = IO2 ⋅ DCR = 0.4A2 ⋅ 105mΩ = 17mW

1.8V Output Capacitor

VDROOP = 0.05V

COUT

=

3 · ΔILOAD

VDROOP · FS

=

3 · 0.3A

0.05V · 1MHz

= 18.0μF

IRMS

=

1 · (VO) · (VIN(MAX) - VO) = 1 ·

2· 3

L1 · F · VIN(MAX)

2· 3

1.8V · (4.2V - 1.8V) = 63mArms

4.7μH · 1.0MHz · 4.2V

Pesr = esr · IRMS2 = 5mΩ · (63mA)2 = 20μW

1126.2006.05.1.1

15

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