LTC3731HG Linear Technology, LTC3731HG Datasheet - Page 25

• Manufacturer Part Number: LTC3731HG
• Description: IC REG SW SYNC 3PH STPDWN 36SSOP
• Manufacturer: Linear Technology
• Series: PolyPhase®r
• Type: Step-Down (Buck)r

Specifications of LTC3731HG

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 0.6 ~ 6 V
• Frequency - Switching: 225kHz ~ 680kHz
• Voltage - Input: 4 ~ 36 V
• Operating Temperature: -40°C ~ 140°C
• Mounting Type: Surface Mount
• Package / Case: 36-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Output: -
• Power - Output: -
• Lead Free Status / Rohs Status: Not Compliant

APPLICATIO S I FOR ATIO
ground should return to the negative terminal of the input
capacitor and not share a common ground path with any
switched current paths. The left half of the circuit gives rise
to the “noise” generated by a switching regulator. The
ground terminations of the synchronous MOSFETs and
Schottky diodes should return to the bottom plate(s) of the
input capacitor(s) with a short isolated PC trace since very
high switched currents are present. A separate isolated path
from the bottom plate(s) of the input and output capacitor(s)
should be used to tie in the IC power ground pin (PGND).
This technique keeps inherent signals generated by high
current pulses taking alternate current paths that have fi-
nite impedances during the total period of the switching
regulator. External OPTI-LOOP compensation allows over-
compensation for PC layouts which are not optimized but
this is not the recommended design procedure.
U
U
W
Figure 13. Single and Polyphase Current Waveforms
I
I
V
V
V
COUT
COUT
V
SW1
SW2
SW3
I
I
CIN
CIN
SW
I
I
I
L1
L2
L3
U
SINGLE PHASE
TRIPLE PHASE
Simplified Visual Explanation of How a 3-Phase
Controller Reduces Both Input and Output RMS
Ripple Current
The effect of multiphase power supply design significantly
reduces the amount of ripple current in both the input and
output capacitors. The RMS input ripple current is divided
by, and the effective ripple frequency is multiplied up by
the number of phases used (assuming that the input
voltage is greater than the number of phases used times
the output voltage). The output ripple amplitude is also
reduced by, and the effective ripple frequency is increased
by the number of phases used. Figure 13 graphically
illustrates the principle.
3731H F13
LTC3731H
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