LTC3736EGN-1#TR Linear Technology, LTC3736EGN-1#TR Datasheet - Page 22

• Manufacturer Part Number: LTC3736EGN-1#TR
• Description: IC CTRLR SW SYNC DUAL 2PH 24SSOP
• Manufacturer: Linear Technology
• Series: PolyPhase®r
• Type: Step-Down (Buck)r

Specifications of LTC3736EGN-1#TR

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: 0.6 ~ 9.8 V
• Current - Output: 1A
• Frequency - Switching: 450kHz ~ 580kHz
• Voltage - Input: 2.75 ~ 9.8 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

APPLICATIO S I FOR ATIO
LTC3736-1
at the FETs. It is better to have two separate, smaller valued
input capacitors (e.g., two 10µF—one for each channel)
than it is to have a single larger valued capacitor (e.g.,
22µF) that the channels share with a common connection.
2) The signal and power grounds should be kept separate.
The signal ground consists of the feedback resistor divid-
ers, I
The power grounds consist of the (–) terminal of the input
and output capacitors and the source of the N-channel
MOSFET. Each channel should have its own power ground
for its power loop (as described in (1) above). The power
grounds for the two channels should connect together at
a common point. It is most important to keep the ground
paths with high switching currents away from each other.
22
TH
compensation networks and the SGND pin.
R
U
IN
V
IN
C
IN
BOLD LINES INDICATE
HIGH, SWITCHING
CURRENT LINES.
KEEP LINES TO A
MINIMUM LENGTH
U
+
W
Figure 12. Branch Current Waveforms
MP1
MP2
U
MN1
MN2
The PGND pins on the LTC3736-1 IC should be shorted
together and connected to the common power ground
connection (away from the switching currents).
3) Put the feedback resistors close to the V
trace connecting the top feedback resistor (R
output capacitor should be a Kelvin trace. The I
sation components should also be very close to the
LTC3736-1.
4) The current sense traces (SENSE
Kelvin connections right at the P-channel MOSFET source
and drain.
5) Keep the switch nodes (SW1, SW2) and the gate driver
nodes (TG1, TG2, BG1, BG2) away from the small-signal
components, especially the opposite channels feedback
resistors, I
sense pins (SENSE
L1
L2
C
C
TH
OUT1
OUT2
compensation components and the current
V
V
+
+
OUT1
OUT2
+
and SW).
37361 F12
R
R
+
L1
L2
and SW) should be
FB
TH
pins. The
B
compen-
) to the
37361f