MC34717(2007) 查看數據表（PDF） - Freescale Semiconductor

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MC34717
(Rev.:2007)

5.0 A 1.0 MHz Fully Integrated Dual Switch-Mode Power Supply

Freescale Semiconductor 

ELECTRICAL CHARACTERISTICS

DYNAMIC ELECTRICAL CHARACTERISTICS

DYNAMIC ELECTRICAL CHARACTERISTICS

Table 4. Dynamic Electrical Characteristics

Characteristics noted under conditions 3.0 V ≤ VIN ≤ 6.0 V, -40°C ≤ TA ≤ 85°C, GND = 0 V unless otherwise noted. Typical

values noted reflect the approximate parameter means at TA = 25°C under nominal conditions unless otherwise noted.

Characteristic

Symbol

Min

Typ

Max

Unit

CHANNEL 1 BUCK CONVERTER (PVIN1, SW1, PGND1, BOOT1, INV1, COMP1, ILIM1)

Switching Node (SW1) Rise Time (19)

(PVIN = 3.3 V, IOUT1 = 5.0 A)

Switching Node (SW1) Fall Time (19)

(PVIN = 3.3 V, IOUT1 = 5.0 A)

-

tRISE1

-

tFALL1

Soft Start Duration (Normal Mode)

tSS1

ILIM1: 1.25V to 1.49V

-

1.5V to 1.81V

-

1.82V to 2.13V

-

2.14V to 2.5V

-

Over Current Limit Timer

tLIM1

-

Over Current Limit Retry Time-out Period

tTIMEOUT1

80

Output Undervoltage/Overvoltage Filter Delay Timer

tFILTER1

5.0

CHANNEL 2 BUCK CONVERTER (PVIN2, SW2, PGND2, BOOT2, INV2, COMP2, ILIM2)

Switching Node (SW2) Rise Time (19)

(PVIN = 3.3 V, IOUT2 = 5.0 A)

Switching Node (SW2) Fall Time (19)

(PVIN = 3.3 V, IOUT2 = 5.0 A)

-

tRISE2

-

tFALL2

Soft Start Duration (Normal Mode)

tSS2

ILIM2: 1.25V to 1.49V

-

1.5V to 1.81V

-

1.82V to 2.13V

-

2.14V to 2.5V

-

Over Current Limit Timer

Over Current Limit Retry Time-out Period

Output Undervoltage/Overvoltage Filter Delay Timer

OSCILLATOR (FREQ) (20)

tLIM2

-

tTIMEOUT2

80

tFILTER2

5.0

Oscillator Default Switching Frequency

(FREQ = GND)

FSW

-

Oscillator Switching Frequency Range

CONTROL AND SUPERVISORY (SD, PG)

FSW

200

PG Reset Delay

Thermal Shutdown Retry Time-out Period (19)

Notes

19. Design information only, this parameter is not production tested.

20. Oscillator frequency is ±10%

tPGRESET

8.0

tTIMEOUT

80

8.0

-

ns

5.0

-

ns

3.2

-

1.6

-

ms

0.8

-

0.4

-

10

-

ms

-

120

ms

-

25

µs

28

-

ns

12.0

-

ns

ms

3.2

-

1.6

-

0.8

-

0.4

-

10

-

ms

-

120

ms

-

25

µs

1.0

-

MHz

-

1000

kHz

-

12

ms

-

120

ms

34717

10

Analog Integrated Circuit Device Data

Freescale Semiconductor

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