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MC33998 数据表(PDF) 11 Page - Freescale Semiconductor, Inc

部件名 MC33998
功能描述  Switching Power Supply with Linear Regulators
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制造商  FREESCALE [Freescale Semiconductor, Inc]
网页  http://www.freescale.com
标志 FREESCALE - Freescale Semiconductor, Inc

MC33998 数据表(HTML) 11 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
11
Freescale Semiconductor
33998
ELECTRICAL CHARACTERISTICS
DYNAMIC ELECTRICAL CHARACTERISTICS
DYNAMIC ELECTRICAL CHARACTERISTICS
Table 4. 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 (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 (VPWR)
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.


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