sc1485itstr Semtech Corporation, sc1485itstr Datasheet - Page 4
sc1485itstr
Manufacturer Part Number
sc1485itstr
Description
Dual Synchronous Buck Pseudo Fixed Frequency Power Supply Controller
Manufacturer
Semtech Corporation
Datasheet
1.SC1485ITSTR.pdf
(27 pages)
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Part Number
Manufacturer
Quantity
Price
Part Number:
SC1485ITSTR
Manufacturer:
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Quantity:
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Part Number:
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Part Number:
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Test Conditions: V
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 6.
(5) Semtech’s SmartDriver
At this point, an additional pullup device is activated, reducing the resistance to 2 (typ.). This negates the need for
an external gate or boost resistor.
POWER MANAGEMENT
Electrical Characteristics (Cont.)
P
F
P
V
O
n I
L
L
L
E
S
S
U
G
S
D
D
D
D
D
D
D
2005 Semtech Corp.
o
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N
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FET drive first pulls DH high with a pullup resistance of 10 (typ.) until LX = 1.5V (typ.).
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8 .
5 .
0 .
1 .
3 .
3 .
0
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C
= V
OUT2
M
=1.25V, R
a
x
4 -
TON1
M
3
3
° 0
7 .
1 .
n i
C
= R
o t
TON2
1
SC1485
www.semtech.com
M
= 1M
2
4
1
1
° 5
4
4
4
a
3 .
2 .
6 .
x
C
U
l c
l c
M
°C
µ
s k
s k
i n
s n
V
V
V
V
A
A
A
s
s t
(
(
) 3
) 3