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33997

Switching Power Supply with Linear Regulators

Motorola => Freescale 

Freescale Semiconductor, Inc.

DYNAMIC ELECTRICAL CHARACTERISTICS

Characteristics noted under conditions 9.0 V ≤ VPWR ≤ 16 V, -40°C ≤ TJ = TA ≤ 125°C using the typical application circuit (see

Figure 8) unless otherwise noted. Typical values noted reflect the approximate parameter mean at TA = 25°C under nominal

conditions unless otherwise noted.

Characteristic

Symbol

Min

Typ

Max

Unit

BUCK REGULATOR VDDH

Switching Frequency (Note 14)

fSW

–

750

–

kHz

Soft Start Duration (see Figure 2)

VPWR = KA_VPWR = 6.0 V

tSS

ms

5.0

–

15

CHARGE PUMP CRES

Charge Pump Current Ramp-Up Time

VPWR = KA_VPWR = 14 V, CRES = 22 nF, VCP = 1.0 V to 11 V

tCRES

ms

1.0

–

20

Charge Pump Ramp-Up Time

VPWR = KA_VPWR = 7.0 V, CRES = 22 nF, VCP = 7.0 V to 10 V

tCRES

ms

1.0

–

10

SENSOR SUPPLIES VREF1, VREF2

VREF Overcurrent Detection Time (see Figure 3)

tDet

VREF Load RL = 5.0 Ω to GND, VDDH = 5.1 V, VPWR = KA_VPWR = 10 V,

EN = 5.0 V, SNSEN = 5.0 V

µs

0.5

–

2.0

VREF Retry Timer Delay (see Figure 3)

tRet

VREF Load RL = 5.0 Ω to GND, VDDH = 5.1 V, VPWR = KA_VPWR = 10 V,

EN = 5.0 V, SNSEN = 5.0 V

5.0

–

ms

20

SUPERVISORY CIRCUITS

PWROK Delay Time (Power-On Reset) (see Figure 4)

tD(PWROK)

5.0

–

15

ms

VKAMOK Delay Time (see Figure 5)

tD(VKAMOK)

10

–

30

ms

VDDH Power-Up Delay Time (see Figure 6)

tD(VPWR)

1.0

–

10

ms

Fault-Off Timer Delay Time (see Figure 7)

tFault

1.0

–

10

ms

Notes

14. Guaranteed by design but not production tested.

33997

10

For More Information OMnOTTOhRiOsLAPrAoNdALuOcGt,INTEGRATED CIRCUIT DEVICE DATA

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