LTC1709EG#PBF Linear Technology, LTC1709EG#PBF Datasheet - Page 25
LTC1709EG#PBF
Manufacturer Part Number
LTC1709EG#PBF
Description
IC REG SW 2PH SYNC STPDWN 36SSOP
Manufacturer
Linear Technology
Type
Step-Down (Buck)r
Datasheet
1.LTC1709EG.pdf
(28 pages)
Specifications of LTC1709EG#PBF
Internal Switch(s)
No
Synchronous Rectifier
Yes
Number Of Outputs
2
Voltage - Output
1.3 ~ 3.5 V
Current - Output
3A
Voltage - Input
4 ~ 36 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
36-SSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Frequency - Switching
-
Available stocks
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APPLICATIO S I FOR ATIO
The output ripple current is reduced significantly when
compared to the single phase solution using the same
inductance value because the V
term from the stage that has its bottom MOSFET on
subtracts current from the (V
resulting from the stage which has its top MOSFET on. The
output ripple current is:
where D is duty factor.
I
RIPPLE
R
IN
V
IN
C
IN
BOLD LINES INDICATE
HIGH, SWITCHING
CURRENT LINES.
KEEP LINES TO A
MINIMUM LENGTH.
+
2
V
fL
OUT
U
Figure 10. Instantaneous Current Path Flow in a Multiple Phase Switching Regulator
1 2
1 2
U
D
IN
D
- V
1
OUT
OUT
1
D
W
/L discharge current
)/L charging current
SW1
SW2
D1
D2
U
L1
L2
The input and output ripple frequency is increased by the
number of stages used, reducing the output capacity
requirements. When V
as illustrated in Figures 3 and 4, very low input and output
ripple currents result.
R
R
SENSE1
SENSE2
IN
is approximately equal to 2(V
+
C
V
OUT
OUT
LTC1709
1709 F10
R
25
L
OUT
)