MC34717 View Datasheet(PDF) - Freescale Semiconductor
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Description
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MC34717 Datasheet PDF : 28 Pages
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ELECTRICAL CHARACTERISTICS
DYNAMIC ELECTRICAL CHARACTERISTICS
DYNAMIC ELECTRICAL CHARACTERISTICS
Table 4. Dynamic Electrical Characteristics
Characteristics noted under conditions 3.0 V ≤ VIN ≤ 6.0 V, -40°C ≤ TA ≤ 85°C, GND = 0 V, unless otherwise noted. Typical
values noted reflect the approximate parameter means at TA = 25°C under nominal conditions, unless otherwise noted.
Characteristic
Symbol
Min
Typ
Max
Unit
CHANNEL 1 BUCK CONVERTER (PVIN1, SW1, PGND1, BOOT1, INV1, COMP1, ILIM1)
Switching Node (SW1) Rise Time(18)
(PVIN = 3.3 V, IOUT1 = 5.0 A)
Switching Node (SW1) Fall Time(18)
(PVIN = 3.3 V, IOUT1 = 5.0 A)
-
8.0
-
tRISE1
ns
-
5.0
-
tFALL1
ns
Minimum OFF Time
Minimum ON Time
Soft Start Duration (Normal Mode)
tOFFMIN
-
150
-
ns
tONMIN
-
0(19)
-
ns
tSS1
ILIM1: 1.25 to 1.49 V
-
3.2
-
1.5 to 1.81 V
-
1.6
-
ms
1.82 to 2.13 V
-
0.8
-
2.14 to 2.5 V
-
0.4
-
Over-current Limit Timer
Over-current Limit Retry Timeout Period
Output Under-voltage/Over-voltage Filter Delay Timer
tLIM1
-
10
-
ms
tTIMEOUT1
80
-
120
ms
tFILTER1
5.0
-
25
µs
CHANNEL 2 BUCK CONVERTER (PVIN2, SW2, PGND2, BOOT2, INV2, COMP2, ILIM2)
Switching Node (SW2) Rise Time(18)
(PVIN = 3.3 V, IOUT2 = 5.0 A)
Switching Node (SW2) Fall Time(18)
(PVIN = 3.3 V, IOUT2 = 5.0 A)
-
28
-
tRISE2
ns
-
12.0
-
tFALL2
ns
Minimum OFF Time
Minimum ON Time
Soft Start Duration (Normal Mode)
tOFFMIN
-
150
-
ns
tONMIN
-
0(19)
-
ns
tSS2
ms
ILIM2: 1.25 to 1.49 V
-
3.2
-
1.5 to 1.81 V
-
1.6
-
1.82 to 2.13 V
-
0.8
-
2.14 to 2.5 V
-
0.4
-
Over-current Limit Timer
Over-current Limit Retry Timeout Period
Output Under-voltage/Over-voltage Filter Delay Timer
OSCILLATOR (FREQ)(20)
tLIM2
-
10
-
ms
tTIMEOUT2
80
-
120
ms
tFILTER2
5.0
-
25
µs
Notes
18. Design information only, this parameter is not production tested.
19. The regulator has the ability to enter into pulse skip mode when the inductor current ripple reaches the threshold for the LS zero detect,
which has a typical value of 500 mA.
20. Oscillator frequency is ±10%
34717
10
Analog Integrated Circuit Device Data
Freescale Semiconductor
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