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LTC1709 Datasheet(PDF) 25 Page - Linear Technology

Part # LTC1709
Description  2-Phase, 5-Bit Adjustable, High Efficiency, Synchronous Step-Down Switching Regulator
PDF  28 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1709 Datasheet(HTML) 25 Page - Linear Technology

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LTC1709
APPLICATIO S I FOR ATIO
Figure 10. Instantaneous Current Path Flow in a Multiple Phase Switching Regulator
RL
VOUT
COUT
+
D1
L1
SW1
RSENSE1
VIN
CIN
RIN
+
D2
BOLD LINES INDICATE
HIGH, SWITCHING
CURRENT LINES.
KEEP LINES TO A
MINIMUM LENGTH.
L2
SW2
1709 F10
RSENSE2
The output ripple current is reduced significantly when
compared to the single phase solution using the same
inductance value because the VOUT/L discharge current
term from the stage that has its bottom MOSFET on
subtracts current from the (VIN - VOUT)/L charging current
resulting from the stage which has its top MOSFET on. The
output ripple current is:
∆I
V
fL
DD
D
RIPPLE
OUT
=
−−
()
−+
2
12
1
12
1
where D is duty factor.
The input and output ripple frequency is increased by the
number of stages used, reducing the output capacity
requirements. When VIN is approximately equal to 2(VOUT)
as illustrated in Figures 3 and 4, very low input and output
ripple currents result.



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