AAT2500 datasheet(10/26 Pages) ANALOGICTECH

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Typical Characteristics

Unless otherwise noted, VIN = 5V, TA = 25°C.

Step-Down Converter Soft Start

(VIN = 3.6V; VOUT = 1.8V; 400mA;

EN = VIN; ENLDO = GND)

250

μμs/div

-4.0

-3.0

-2.0

-1.0

0.0

1.0

2.0

3.0

4.0

-0.5

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

Step-Down Converter Line Regulation

(VOUT = 1.8V; EN = VIN; ENLDO = GND)

Input Voltage (V)

-0.35

-0.3

-0.25

-0.2

-0.15

-0.1

-0.05

0.05

0.1

2.5

3.0

3.5

4.0

4.5

5.0

5.5

6.0

IOUT = 400mA

IOUT = 100mA

IOUT = 10mA

Step-Down Converter Line Transient

(VOUT = 1.8V @ 400mA; EN = VIN; ENLDO = GND)

Time (25

μμs/div)

1.50

1.55

1.60

1.65

1.70

1.75

1.80

1.85

1.90

3.0

3.5

4.0

4.5

5.0

5.5

6.0

6.5

7.0

Step-Down Converter Load Transient Response

(30mA - 300mA; VIN = 3.6V; VOUT = 1.8V;

C1 = 4.7

μμF; EN = V

IN; ENLDO = GND)

Time (25

μs/div)

1.2

1.3

1.4

1.5

1.6

1.7

1.8

1.9

2.0

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0.0

-0.2

300mA

30mA

Step-Down Converter Load Transient Response

(30mA - 300mA; VIN = 3.6V; VOUT = 1.8V; C1 = 10

μμF;

C4 = 100pF; EN = VIN; ENLDO = GND)

Time (25

μs/div)

-0.7

-0.6

-0.5

-0.4

-0.3

-0.2

-0.1

0.1

0.0

1.2

1.4

0.8

0.6

1.0

0.2

0.4

-0.2

0.0

300mA

30mA

Step-Down Converter Load Transient Response

(30mA - 300mA; VIN = 3.6V; VOUT = 1.8V;

C1 = 10

μμF; EN = V

IN; ENLDO = GND)

Time (25

μs/div)

1.2

1.3

1.4

1.5

1.6

1.7

1.8

1.9

2.0

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0.0

-0.2

300mA

30mA

AAT2500

1MHz Step-Down Converter/LDO Regulator

2500.2006.05.1.16

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