SC2440TETRT Semtech, SC2440TETRT Datasheet - Page 21
SC2440TETRT
Manufacturer Part Number
SC2440TETRT
Description
IC SW REG DUAL 2.5MHZ 16-TSSOP
Manufacturer
Semtech
Type
Step-Down (Buck)r
Datasheet
1.SC2440TETRT.pdf
(26 pages)
Specifications of SC2440TETRT
Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
2
Current - Output
2A
Frequency - Switching
1.4MHz
Voltage - Input
2.8 ~ 20 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
16-TSSOP Exposed Pad, 16-eTSSOP, 16-HTSSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Output
-
Power - Output
-
Other names
SC2440TETR
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
SC2440TETRT
Manufacturer:
TEXAS
Quantity:
198
Part Number:
SC2440TETRT
Manufacturer:
SEMTECH/美国升特
Quantity:
20 000
Board Layout Considerations
In a step-down switching regulator, the input bypass
capacitor, the main power switch and the freewheeling
diode carry switched currents with high
POWER MANAGEMENT
Applications Information
2005 Semtech Corp.
Upper Trace : OUT1 Voltage, AC Coupled, 0.5V/div
Lower Trace : L
Figure 14. Overall Loop Gain and Phase versus Frequency for (a) Channel 1 and (b) Channel 2 of the Dual
V
C
IN
5
=470pF, R
=12V, V
DC-DC Converter in Figure 1. (c) Channel 1 Load Transient Response, I
0.3A and 1.7A. (d) Channel 2 Load Transient Response, I
1.7A.
OUT
1
=3.3V at 1.7A,
5
=15.4K
Inductor Current, 0.5A/div
40 s/div
(a)
(c)
and C
V
6
OUT
=10pF
=3.3V
dt
di
(Figure 15).
21
For jitter-free operation, the size of the loop formed by
these components should be minimized. Since the power
switches are already integrated within the SC2440,
connecting the anodes of both freewheeling diodes close
to the negative terminal of the input bypass capacitor
minimizes size of the switched current loop. The input
bypass capacitors should also be placed close to the
Upper Trace : OUT2 Voltage, AC Coupled, 0.5V/div
Lower Trace : L
V
C
IN
7
=220pF, R
=12V, V
OUT2
OUT
2
=5V at 1.7A,
8
is switched between 0.45A and
=24.3K
Inductor Current, 0.5A/div
40 s/div
(b)
(d)
OUT1
and C
is switched between
9
V
=10pF
OUT
=5V
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