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MC34717 Fiches technique(PDF) 10 Page - Freescale Semiconductor, Inc

No de pièce MC34717
Description  5.0 A 1.0 MHz Fully Integrated Dual Switch-Mode Power Supply
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Fabricant  FREESCALE [Freescale Semiconductor, Inc]
Site Internet  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC34717 Fiches technique(HTML) 10 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
10
Freescale Semiconductor
34717
ELECTRICAL CHARACTERISTICS
DYNAMIC ELECTRICAL CHARACTERISTICS
DYNAMIC ELECTRICAL CHARACTERISTICS
Table 4. Dynamic Electrical Characteristics
Characteristics noted under conditions 3.0 V
≤ V
IN ≤ 6.0 V, - 40°C ≤ T
A ≤ 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)
tRISE1
-
8.0
-
ns
Switching Node (SW1) Fall Time(18)
(PVIN = 3.3 V, IOUT1 = 5.0 A)
tFALL1
-
5.0
-
ns
Minimum OFF Time
tOFFMIN
-
150
-
ns
Minimum ON Time
tONMIN
-
0(19)
-
ns
Soft Start Duration (Normal Mode)
ILIM1: 1.25 to 1.49 V
1.5 to 1.81 V
1.82 to 2.13 V
2.14 to 2.5 V
tSS1
-
-
-
-
3.2
1.6
0.8
0.4
-
-
-
-
ms
Over-current Limit Timer
tLIM1
-
10
-
ms
Over-current Limit Retry Timeout Period
tTIMEOUT1
80
-
120
ms
Output Under-voltage/Over-voltage Filter Delay Timer
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)
tRISE2
-
28
-
ns
Switching Node (SW2) Fall Time(18)
(PVIN = 3.3 V, IOUT2 = 5.0 A)
tFALL2
-
12.0
-
ns
Minimum OFF Time
tOFFMIN
-
150
-
ns
Minimum ON Time
tONMIN
-
0(19)
-
ns
Soft Start Duration (Normal Mode)
ILIM2: 1.25 to 1.49 V
1.5 to 1.81 V
1.82 to 2.13 V
2.14 to 2.5 V
tSS2
-
-
-
-
3.2
1.6
0.8
0.4
-
-
-
-
ms
Over-current Limit Timer
tLIM2
-
10
-
ms
Over-current Limit Retry Timeout Period
tTIMEOUT2
80
-
120
ms
Output Under-voltage/Over-voltage Filter Delay Timer
tFILTER2
5.0
-
25
µs
OSCILLATOR (FREQ)(20)
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%


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