AAT1157 查看數據表（PDF） - Analog Technology Inc

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AAT1157

1MHz 1.2A Buck DC/DC Converter

Analog Technology Inc 

AAT1157

1MHz 1.2A Buck DC/DC Converter

AAT1157 Dissipation and Junction Temperature Estimate:

PTOTAL

=

IO2

·

(RDSON(HS)

·

VO +

VIN

RDSON(LS)

·

(VIN

-VO))

+ (tsw · F · IO + IQ) · VIN

1.2A2 · (0.17Ω · 2.5V + 0.16Ω · (4.2V - 2.5V))

=

+ (20nsec · 1MHz · 1.2A + 275µA) · 4.2V

4.2V

= 341mW

TJ(MAX) = TAMB + ΘJA · PTOTAL = 85°C + 50°C/W · 0.341W = 102°C

Surface Mount Inductors

Manufacturer

Sumida

Sumida

Sumida

TaiyoYuden

Sumida

Sumida

Sumida

Sumida

Sumida

Sumida

MuRata

MuRata

Part Number

CDRH5D28-2R6

CDRH5D28-3R0

CDRH5D28-4R2

NPO5DB4R7M

CDRH4D28-2R2

CDRH4D28-2R7

CDRH4D28-3R3

CDRH5D18-4R1

CDRH3D16/HP-2R2

CDRH3D16/HP-3R3

LQH55DN4R7M03

LQH66SN4R7M03

Value

(µH)

2.6

3.0

4.2

4.7

2.2

2.7

3.3

4.1

2.2

3.3

4.7

4.7

Max DC

Current (A)

2.6

2.4

2.2

1.4

2.04

1.6

1.57

1.95

2.3

1.8

2.7

2.2

DCR

(mΩ)

18

24

31

38

31

43

49

57

59

85

41

25

Size (mm)

Lx W x H

5.7x5.7x3.0

5.7x5.7x3.0

5.7x5.7x3.0

5.9x6.1x2.8

5.0x5.0x3.0

5.0x5.0x3.0

5.0x5.0x3.0

5.7x5.7x2.0

4.0x4.0x1.8

4.0x4.0x1.8

5.0x5.0x4.7

6.3x6.3x4.7

Type

Shielded

Shielded

Shielded

Shielded

Shielded

Shielded

Shielded

Shielded

Shielded

Shielded

Non-Shielded

Shielded

Surface Mount Capacitors

Manufacturer

MuRata

MuRata

MuRata

Part Number

GRM21BR60J106ME01L

GRM21BR60J226ME01L

GRM31CR60J106KA01L

Value

(µF)

10

22

10

Voltage

(V)

6.3

6.3

6.3

Temp. Co.

X5R

X5R

X5R

Case

0805

0805

1206

12

1157.2005.11.1.4

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