LTC3728LXCUH Linear Technology, LTC3728LXCUH Datasheet - Page 33

• Manufacturer Part Number: LTC3728LXCUH
• Description: IC CTRLR SW REG 2-PH SYNC 32-QFN
• Manufacturer: Linear Technology
• Series: PolyPhase®r
• Type: Step-Down (Buck)r

Specifications of LTC3728LXCUH

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: 0.8 ~ 7 V
• Current - Output: 3A
• Frequency - Switching: 250kHz ~ 550kHz
• Voltage - Input: 4.5 ~ 28 V
• Operating Temperature: 0°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-QFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

TYPICAL APPLICATIONS
V
V
IN
OUT
180pF
180pF
100pF
100pF
0.1μF
8.06k
4.75k
: 7V TO 28V
20k
10k
20k
1%
1%
: 5V, 4A/3.3V, 5A
0.01μF
0.1μF
1500pF
1000pF
63.4k
105k
1%
1%
Figure 13. LTC3728L/LTC3728LX 5V/4A, 3.3V/5A Regulator with External Frequency Synchronization
1000pF
1000pF
1000pF
SWITCHING FREQUENCY = 250kHz TO 550kHz
M1, M2: FDS6982S OR VISHAY Si4810DY
3.3V
f
SYNC
RUN/SS1
SENSE1
SENSE1
V
PLLFLTR
PLLIN
FCB
I
SGND
3.3V
I
V
SENSE2
SENSE2
TH1
TH2
LTC3728L/LTC3728LX
OSENSE1
OSENSE2
OUT
+
–
–
+
RUN/SS2
BOOST1
BOOST2
EXTV
PGOOD
INTV
PGND
SW1
SW2
BG1
BG2
TG1
TG2
V
CC
CC
IN
L1, L2: SUMIDA CDEP105-4R3MC-88
OUTPUT CAPACITORS: PANASONIC SP SERIES
1μF
CMDSH-3TR
0.1μF
V
(<7V)
PGOOD
CMDSH-3TR
PULL-UP
4.7μF, 10V
0.1μF
PIN 4
PIN 4
LTC3728L/LTC3728LX
0.1μF
10Ω
M1
M2
Q1
Q3
1μF 50V
1μF 50V
4.3μH
4.3μH
22μF
50V
L1
L2
Q2
Q4
150μF, 6.3V
0.008Ω
0.008Ω
180μF, 4V
3728 F13
V
5V/4A
GND
V
7V TO
28V
V
3.3V/5A
OUT1
IN
OUT2
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