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MC34716 Datasheet, PDF (10/27 Pages) Freescale Semiconductor, Inc – 1.0 MHz Dual Switch-Mode DDR Power Supply
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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(21)
(PVIN = 3.3 V, IOUT1 = 5.0 A)
Switching Node (SW1) Fall Time(21)
(PVIN = 3.3 V, IOUT1 = 5.0 A)
tRISE1
-
8.0
-
ns
tFALL1
-
5.0
-
ns
Minimum OFF Time
Minimum ON Time
tOFFMIN
-
150
-
ns
tONMIN
-
0(22)
-
ns
Soft Start Duration (Normal Mode)
tSS1
ms
ILIM1: 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
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)
Switching Node (SW2) Rise Time(21)
(PVIN = 3.3 V, IOUT2 = ±3.0 A)
Switching Node (SW2) Fall Time(21)
(PVIN = 3.3 V, IOUT2 = ±3.0 A)
tRISE2
-
28
-
ns
tFALL2
-
12.0
-
ns
Minimum OFF Time
tOFFMIN
-
150
-
ns
Minimum ON Time
tONMIN
-
100
-
ns
Soft Start Duration (Normal Mode)
tSS2
-
1.6
-
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
OSCILLATOR (FREQ)(23)
tFILTER2
5.0
-
25
µs
Oscillator Default Switching Frequency
(FREQ = GND)
fSW
-
1.0
-
MHz
Oscillator Switching Frequency Range
fSW
200
-
1000
kHz
Notes
21. Design information only, this parameter is not production tested.
22. 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.
23. Oscillator Frequency tolerance is ±10%.
34716
10
Analog Integrated Circuit Device Data
Freescale Semiconductor
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