mc33998 Freescale Semiconductor, Inc, mc33998 Datasheet - Page 11

• Manufacturer Part Number: mc33998
• Description: Switching Power Supply With Linear Regulators
• Manufacturer: Freescale Semiconductor, Inc

Table 4. DYNAMIC ELECTRICAL CHARACTERISTICS
11
Figure
conditions unless otherwise noted.
BUCK REGULATOR (VDDH)
CHARGE PUMP (CRES)
SENSOR SUPPLIES (VREF1, VREF2)
SUPERVISORY CIRCUITS (VPWR)
Notes
33998
ELECTRICAL CHARACTERISTICS
DYNAMIC ELECTRICAL CHARACTERISTICS
Switching Frequency
Soft Start Duration (see
Charge Pump Current Ramp-Up Time
Charge Pump Ramp-Up Time
VREF Overcurrent Detection Time (see
VREF Retry Timer Delay (see
PWROK Delay Time (Power-On Reset) (see
VKAMOK Delay Time (see
VDDH Power-Up Delay Time (see
Fault-Off Timer Delay Time (see
14.
Characteristics noted under conditions 9.0 V
V
V
V
V
EN = 5.0 V, SNSEN = 5.0 V
V
EN = 5.0 V, SNSEN = 5.0 V
PWR
PWR
PWR
REF
REF
Guaranteed by design but not production tested.
8) unless otherwise noted. Typical values noted reflect the approximate parameter mean at T
Load R
Load R
= KA_V
= KA_V
= KA_V
L
L
PWR
PWR
PWR
= 5.0 Ω to GND, V
= 5.0 Ω to GND, V
(14)
= 6.0 V
= 14 V, C
= 7.0 V, C
Figure
Figure
Figure
Characteristic
2)
RES
RES
Figure
5)
Figure
DDH
= 22 nF, V
DDH
= 22 nF, V
3)
7)
Figure
DYNAMIC ELECTRICAL CHARACTERISTICS
= 5.1 V, V
= 5.1 V, V
6)
Figure
CP
3)
CP
= 1.0 V to 11 V
= 7.0 V to 10 V
PWR
PWR
4)
≤
V
PWR
= KA_V
= KA_V
≤
16 V, -40°C
PWR
PWR
= 10 V,
= 10 V,
≤
T
J
t
t
= T
D(VKAMOK)
D(PWROK)
t
Symbol
D(VPWR)
t
t
t
FAULT
CRES
CRES
t
t
f
t
DET
RET
A
SW
SS
≤
125°C using the typical application circuit (see
Analog Integrated Circuit Device Data
Min
5.0
1.0
1.0
0.5
5.0
5.0
1.0
1.0
10
–
A
Typ
750
Freescale Semiconductor
= 25°C under nominal
–
–
–
–
–
–
–
–
–
Max
2.0
15
20
10
20
15
30
10
10
–
Unit
kHz
ms
ms
ms
ms
ms
ms
ms
ms
µs