LTC3728EG Linear Technology, LTC3728EG Datasheet - Page 32

• 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: -

LTC3728
TYPICAL APPLICATIONS
32
V
V
SWITCHING FREQUENCY = 250kHz
MI, M2, M3, M4: NDS8410A
L1: SUMIDA CEP123-6R3MC
T1: 10 H 1:1.8 — DALE LPE6562-A262 GAPPED E-CORE OR BH ELECTRONICS #501-0657 GAPPED TOROID
IN
OUT
180pF
180pF
0.1 F
: 7V TO 28V
33pF
33pF
20k
15k
15k
20k
1%
1%
: 5V, 3A/3.3V, 5A/12V, 120mA
59k
0.1 F
1000pF
1000pF
105k, 1%
63.4k
1%
1000pF
1000pF
3.3V
Figure 12. LTC3728 High Effi ciency Low Noise 5V/3A, 3.3V/5A, 12V/120mA Regulator
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
BG1
BG2
TG1
TG2
V
CC
CC
IN
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1 F
10V
100k
V
(<7V)
PGOOD
CMDSH-3TR
CMDSH-3TR
PULL-UP
0.1 F
0.1 F
4.7 F
1M
0.1 F
10
M1
M3
MBRS1100T3
T1, 1:1.8
6.3 H
10 H
M2
22 F
M4
50V
L1
PANASONIC SP
PANASONIC SP
150 F, 6.3V
180 F, 4V
0.01
0.015
D1
MBRM
140T3
D2
MBRM
140T3
3728 F12
33 F
25V
3
+
V
7V TO
28V
V
3.3V
5A; 6A PEAK
IN
OUT2
LT1121
2
100k
220k
8
+
1
5
GND
1 F
25V
V
5V
3A; 4A PEAK
ON/OFF
V
12V
120mA
OUT1
OUT3
3728fg