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

LTC3731H
applicaTions inForMaTion

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
+
–
1000pF
OUTPUT CAPACITOR
INDUCTOR
SENSE
RESISTOR
SENSE
3731H F12
Figure 11. Branch Current Waveforms
SW1
SW2
SW3
D2
D1
D3
L1
L2
L3
7) The 47pF to 330pF ceramic capacitor between the I
pin and signal ground should be placed as close as pos-
sible to the IC.
Figure 11 illustrates all branch currents in a three-phase
switching regulator. It becomes very clear after study-
ing the current waveforms why it is critical to keep the
high switching current paths to a small physical size.
High electric and magnetic fields will radiate from these
“loops” just as radio stations transmit signals. The output
capacitor ground should return to the negative terminal
R
R
R
SENSE2
SENSE3
SENSE1
C
3731H F11
OUT
+
V
OUT
3731Hfb
TH
R
L