MC33997 Datasheet, PDF (10/20 Pages) Motorola, Inc – Switching Power Supply with Linear Regulators

Freescale Semiconductor, Inc.
DYNAMIC ELECTRICAL CHARACTERISTICS
Characteristics noted under conditions 9.0 V ≤ V_PWR ≤ 16 V, -40°C ≤ T_J = T_A ≤ 125°C using the typical application circuit (see
Figure 8) unless otherwise noted. Typical values noted reflect the approximate parameter mean at T_A = 25°C under nominal
conditions unless otherwise noted.
Characteristic
Symbol
Min
Typ
Max
Unit
BUCK REGULATOR V_DDH
Switching Frequency (Note 14)
f_SW
–
750
–
kHz
Soft Start Duration (see Figure 2)
V_PWR = KA_V_PWR = 6.0 V
t_SS
ms
5.0
–
15
CHARGE PUMP C_RES
Charge Pump Current Ramp-Up Time
V_PWR = KA_V_PWR = 14 V, C_RES = 22 nF, V_CP = 1.0 V to 11 V
t_CRES
ms
1.0
–
20
Charge Pump Ramp-Up Time
V_PWR = KA_V_PWR = 7.0 V, C_RES = 22 nF, V_CP = 7.0 V to 10 V
t_CRES
ms
1.0
–
10
SENSOR SUPPLIES V_REF1, V_REF2
V_REF Overcurrent Detection Time (see Figure 3)
t_Det
V_REF Load R_L = 5.0 Ω to GND, V_DDH = 5.1 V, V_PWR = KA_V_PWR = 10 V,
EN = 5.0 V, SNSEN = 5.0 V
µs
0.5
–
2.0
V_REF Retry Timer Delay (see Figure 3)
t_Ret
V_REF Load R_L = 5.0 Ω to GND, V_DDH = 5.1 V, V_PWR = KA_V_PWR = 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)
t_D(PWROK)
5.0
–
15
ms
VKAMOK Delay Time (see Figure 5)
t_D(VKAMOK)
10
–
30
ms
V_DDH Power-Up Delay Time (see Figure 6)
t_D(VPWR)
1.0
–
10
ms
Fault-Off Timer Delay Time (see Figure 7)
t_Fault
1.0
–
10
ms
Notes
14. Guaranteed by design but not production tested.
33997
10
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