sc1485itstr Semtech Corporation, sc1485itstr Datasheet - Page 4
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sc1485itstr
Manufacturer Part Number
sc1485itstr
Description
Dual Synchronous Buck Pseudo Fixed Frequency Power Supply Controller
Manufacturer
Semtech Corporation
Datasheet
1.SC1485ITSTR.pdf
(27 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
SC1485ITSTR
Manufacturer:
SEMTECH/美国升特
Quantity:
20 000
Company:
Part Number:
sc1485itstrT
Manufacturer:
ON
Quantity:
6 285
Part Number:
sc1485itstrT
Manufacturer:
SEMTECH/美国升特
Quantity:
20 000
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.).
1
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0 .
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8 .
5 .
0 .
1 .
3 .
3 .
0
p
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