SC411 Semtech Corporation, SC411 Datasheet - Page 5

• Manufacturer Part Number: SC411
• Description: Synchronous Buck Pseudo-Fixed Frequency Power Supply Controller
• Manufacturer: Semtech Corporation

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Notes:
1) When the inductor is in continuous and discontinuous conduction mode, the output voltage will have a DC regulation level higher than the
error-comparator threshold by 50% of the ripple voltage.
2) Using a current sense resistor, this measurement relates to PGND minus the voltage of the source on the low-side MOSFET. These values
guaranteed by the ILIM Source Current and Current Comparator Offset tests.
3) clks = Switching cycles.
4) Guaranteed by design. See Shoot-Through Delay Timing Diagram on Page 8.
5) Semtech’s SmartDriver
pull-up device is activated, reducing the resistance to 2Ω (typ). This negates the need for an external gate or boost resistor.
© 2007 Semtech Corp.
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Parameter
Soft-Start
Soft-Start Ramp Time
Under-Voltage Blank Time
Gate Drivers
Shoot-Through Delay
DL Pull-Down Resistance
DL Sink Current
DL Pull-Up Resistance
DL Source Current
TM
(4)
FET drive fi rst pulls DH high with a pull-up resistance of 10Ω (typ) until LX = 1.5V (typ). At this point, an additional
EN/PSV High to PGD High
EN/PSV High to UV High
DH or DL Rising
Conditions
DL = 2.5V
DL = 2.5V
DL High
DL Low
5
Min
25°C
0.80
Typ
440
440
3.1
1.3
30
2
Max
-40°C to 125°C
Min
Max
1.75
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4
SC411
Units
clks
clks
ns
Ω
Ω
A
A
(3)
(3)