LT8640 datasheet(6/22 Pages) AD

6 / 22 page

LT8644S

Rev. 0

For more information www.analog.com

TYPICAL PERFORMANCE CHARACTERISTICS

Switching Frequency

Burst Frequency

Soft-Start Tracking

Soft-Start Current

Error Amp Output Current

PG Thresholds Above VREF

PG Thresholds Below VREF

RT = 18.2k

TEMPERATURE (°C)

–50 –25

100 125

1.875

1.900

1.925

1.950

1.975

2.000

2.025

8644S G17

VSS = 0.5V

TEMPERATURE (°C)

–50 –25

100 125

1.6

1.7

1.8

1.9

2.0

2.1

2.2

2.3

2.4

Soft-Start Current

8644S G20

FB RISING

FB FALLING

TEMPERATURE (°C)

–50 –25

100 125

–9.5

–9.0

–8.5

–8.0

–7.5

–7.0

–6.5

–6.0

PG Thresholds Below VREF

8644S G23

FB RISING

FB FALLING

TEMPERATURE (°C)

–50 –25

100 125

6.0

6.5

7.0

7.5

8.0

8.5

9.0

9.5

8644S G22

RT Programmed Switching

Frequency

Minimum Input Voltage

SWITCHING FREQUENCY (MHz)

0.5

1.5

2.5

3.5

105

120

135

150

Frequency

8644S G24

TEMPERATURE (°C)

–50 –25

100 125

2.0

2.1

2.2

2.3

2.4

2.5

2.6

2.7

2.8

Minimum Input Voltage

8644S G25

SS VOLTAGE (V)

0.2

0.4

0.6

0.8

1.0

1.2

1.4

0.2

0.4

0.6

0.8

8644S G19

FRONT PAGE APPLICATION

VIN = 5V

VOUT = 1.2V

LOAD CURRENT (A)

0 0.25 0.50 0.75 1 1.25 1.50 1.75 2

0.5

1.0

1.5

2.0

2.5

8644S G18

VC = 1.25V

FB PIN ERROR VOLTAGE (mV)

–200

–100

100

200

–400

–300

–200

–100

100

200

300

400

8644S G21

TA = 25°C, unless otherwise noted.

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