LT8625SP datasheet(18/44 Pages) AD

18 / 44 page

Data Sheet

LT83401/LT83402

analog.com

Rev. 0

18 of 44

Figure 40. Switching Waveforms, Pulse-Skipping Operation

Figure 41. Transient Response: Load Current Stepped

from 1A to 2A

See Typical Application Circuit (Figure 59)

Figure 42. Transient Response: Load Current Stepped

from 0.1A to 1.1A

Figure 43. Case Temperature Rise

Figure 44. Conducted EMI Performance (CISPR Conducted

Emission Test with Class 5 Peak Limits)

Figure 45. Radiated EMI Performance (CISPR25 Radiated

Emission Test with Class 5 Peak Limits)

12VIN TO 3.3VOUT AT 5mA

VSYNC = 0V

1µs/DIV

VSW

5V/DIV

100mA/DIV

20µs/DIV

ILOAD

1A/DIV

VOUT

20mV/DIV

VIN = 12V, VOUT = 3.3V, fSW = 2MHz, RC = 1.0kΩ, CC = 4.7nF

FORCED CONTINUOUS MODE

PULSE-SKIPPING MODE

0.1A

1.1A

20µs/DIV

ILOAD

1A/DIV

VOUT

20mV/DIV

VIN = 12V, VOUT = 3.3V, fSW = 2MHz, RC = 1.0k, CC = 4.7nF

DEMO BOARD, IN STILL AIR

VOUT = 3.3V

FORCED CONTINUOUS MODE

VIN = 12V, fSW = 1MHz

VIN = 12V, fSW = 2MHz

VIN = 24V, fSW = 1MHz

VIN = 24V, fSW = 2MHz

LOAD CURRENT (A)

0.5

1.0

1.5

2.0

2.5

EVAL-LT83402-AZ DEMO BOARD

(WITH EMI FILTER INSTALLED)

12V INPUT TO 3.3V OUTPUT AT 2.5A, fSW = 2MHz

CLASS 5 PEAK LIMIT

AMBIENT

FORCED CONTINUOUS MODE

FREQUENCY (MHz)

0.1

100 200

–10

EVAL-LT83402-AZ DEMO BOARD

(WITH EMI FILTER INSTALLED)

12V INPUT TO 3.3V OUTPUT AT 2.5A, fSW = 2MHz

CLASS 5 PEAK LIMIT

AMBIENT

FORCED CONTINUOUS MODE

FREQUENCY (MHz)

0.1

100

1000

–10

LT8625SP Datasheet(PDF) 18 Page - Analog Devices

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