LTC3731HG Linear Technology, LTC3731HG Datasheet - Page 24

• 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
LTC3731H
24
V
IN
BOLD LINES INDICATE HIGH,
SWITCHING CURRENTS.
KEEP LINES TO A MINIMUM LENGTH.
R
IN
+
C
IN
Figure 12. Kelvin Sensing R
LTC3731H
SENSE
SENSE
U
+
–
U
1000pF
OUTPUT CAPACITOR
INDUCTOR
W
SENSE
RESISTOR
SENSE
3731H F12b
Figure 11. Branch Current Waveforms
SW1
SW2
SW3
D2
D1
D3
U
L1
L2
L3
7) The 47pF to 330pF ceramic capacitor between the I
pin and signal ground should be placed as close as
possible to the IC.
Figure 11 illustrates all branch currents in a three-phase
switching regulator. It becomes very clear after studying
the current waveforms why it is critical to keep the high
switching current paths to a small physical size. High elec-
tric and magnetic fields will radiate from these “loops” just
as radio stations transmit signals. The output capacitor
R
R
R
SENSE2
SENSE3
SENSE1
C
3731H F11
OUT
V
+
OUT
3731hfa
TH
R
L