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MC33998DW Scheda tecnica(PDF) 10 Page - Freescale Semiconductor, Inc

Il numero della parte MC33998DW
Spiegazioni elettronici  Switching Power Supply with Linear Regulators
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Produttore elettronici  FREESCALE [Freescale Semiconductor, Inc]
Homepage  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

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33998
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
10
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
5.0
15
ms
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
1.0
20
ms
Charge Pump Ramp-Up Time
VPWR = KA_VPWR = 7.0 V, CRES = 22 nF, VCP = 7.0 V to 10 V
tCRES
1.0
10
ms
SENSOR SUPPLIES VREF1, VREF2
VREF Overcurrent Detection Time (see Figure 3)
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
tDet
0.5
2.0
µs
VREF Retry Timer Delay (see Figure 3)
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
tRet
5.0
20
ms
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.
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com


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