LTC3728EG Linear Technology, LTC3728EG Datasheet - Page 33

• Manufacturer Part Number: LTC3728EG
• Description: IC SW REG SYNC STP-DN DUAL28SSOP
• Manufacturer: Linear Technology
• Series: PolyPhase®r
• Type: Step-Down (Buck)r

Specifications of LTC3728EG

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: 0.8 ~ 5.5 V
• Current - Output: 3A
• Frequency - Switching: 250kHz ~ 550kHz
• Voltage - Input: 3.5 ~ 36 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

TYPICAL APPLICATIONS
V
V
IN
OUT
0.1 F
: 5.2V TO 28V
27pF
27pF
33pF
33pF
20k
10k
15k
15k
20k
1%
1%
: 5V, 4A/3.3V, 4A
0.01 F
0.1 F
220pF
220pF
63.4k
105k
1%
1%
1000pF
1000pF
1000pF
Figure 13. LTC3728 5V/4A, 3.3V/4A Regulator with External Frequency Synchronization
SWITCHING FREQUENCY = 250kHz TO 550kHz
MI, M2: FDS6982S
3.3V
f
SYNC
10
11
12
13
14
1
2
3
4
5
6
7
8
9
RUN/SS1
SENSE1
SENSE1
V
PLLFLTR
PLLIN
FCB
I
SGND
3.3V
I
V
SENSE2
SENSE2
TH1
TH2
OSENSE1
OSENSE2
OUT
LTC3728
+
–
–
+
RUN/SS2
BOOST1
BOOST2
EXTV
PGOOD
INTV
PGND
SW1
SW2
TG1
BG1
BG2
TG2
V
CC
CC
IN
28
27
26
25
24
23
22
21
20
19
18
17
16
15
L1, L2: 8 H SUMIDA CEP1238R0MC
OUTPUT CAPACITORS: PANASONIC SP SERIES
1 F
10V
V
(<7V)
CMDSH-3TR
CMDSH-3TR
PGOOD
0.1 F
0.1 F
PULL-UP
4.7 F
0.1 F
10
M2
M1
8 H
22 F
8 H
50V
L1
L2
0.015
0.015
56 F, 4V
47 F
6.3V
LTC3728
3728 F13
V
5V
3A; 4A PEAK
GND
V
5.2V TO
28V
V
3.3V
3A; 4A PEAK
OUT1
IN
OUT2
33
3728fg