LTC3728 Linear Technology, LTC3728 Datasheet - Page 2

• Manufacturer Part Number: LTC3728
• Description: 2-Phase Synchronous Step-Down Switching Regulator
• Manufacturer: Linear Technology

PACKAGE/ORDER I FOR ATIO
ABSOLUTE AXI U RATI GS
LTC3728
Input Supply Voltage (V
Top Side Driver Voltages
(BOOST1, BOOST2) ...................................42V to – 0.3V
Switch Voltage (SW1, SW2) .........................36V to – 5V
INTV
(BOOST2-SW2), PGOOD .............................7V to – 0.3V
SENSE1
SENSE2
Consult LTC Marketing for parts specified with wider operating temperature ranges.
SYMBOL
Main Control Loops
V
I
V
V
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
2
VOSENSE1, 2
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking:
OSENSE1, 2
REFLNREG
LOADREG
V
V
RUN/SS1
SENSE1
SENSE1
SENSE2
SENSE2
PLLFLTR
OSENSE1
3.3V
OSENSE2
PLLIN
SGND
CC,
I
I
FCB
OUT
TH1
TH2
+
–
–
+
T
EXTV
+
–
JMAX
, SENSE2
28-LEAD PLASTIC SSOP
10
11
12
13
14
1
2
3
4
5
6
7
8
9
Voltages ........................ (1.1)INTV
PARAMETER
Regulated Feedback Voltage
Feedback Current
Reference Voltage Line Regulation
Output Voltage Load Regulation
= 125°C, θ
G PACKAGE
CC
TOP VIEW
, RUN/SS1, RUN/SS2, (BOOST1-SW1),
W
JA
+
= 95°C/W
, SENSE1
28
27
26
25
24
23
22
21
20
19
18
17
16
15
IN
).........................36V to – 0.3V
PGOOD
TG1
SW1
BOOST1
V
BG1
EXTV
INTV
PGND
BG2
BOOST2
SW2
TG2
RUN/SS2
IN
W W
CC
CC
–
,
U
ORDER PART
LTC3728EG
NUMBER
W
CONDITIONS
(Note 3); I
(Note 3)
V
(Note 3)
Measured in Servo Loop; ∆I
Measured in Servo Loop; ∆I
IN
U
= 3.6V to 30V (Note 3)
CC
A
= 25°C. V
to – 0.3V
TH1, 2
The
U
(Note 1)
Voltage = 1.2V
V
IN
●
PLLFLTR
OSENSE1
3.3V
denotes the specifications which apply over the full operating
= 15V, V
PLLIN
SGND
I
I
EXPOSED PAD IS SGND (MUST BE SOLDERED TO PCB)
FCB
OUT
TH1
TH2
PLLIN, PLLFLTR, FCB, Voltage ............ INTV
I
Peak Output Current <10µs (TG1, TG2, BG1, BG2) ... 3A
INTV
Operating Temperature Range (Note 7) ... –40°C to 85°C
Junction Temperature (Note 2) ............................. 125°C
Storage Temperature Range ................. – 65°C to 125°C
Lead Temperature (Soldering, 10 sec)
(G Package Only) .................................................. 300°C
TH1,
TH
TH
1
2
3
4
5
6
7
8
32-LEAD (5mm × 5mm) PLASTIC QFN
Voltage = 1.2V to 0.7V
Voltage = 1.2V to 2.0V
RUN/SS1, 2
32
9 10 11 12 13
I
CC
TH2
T
JMAX
http://www.linear.com/leadfree/
31 30 29 28 27 26 25
Peak Output Current ................................ 50mA
, V
= 125°C, θ
UH PACKAGE
OSENSE1
TOP VIEW
= 5V unless otherwise noted.
33
JA
= 34°C/W
14 15 16
, V
OSENSE2
●
●
●
24
23
22
21
20
19
18
17
0.792
MIN
BOOST1
V
BG1
EXTV
INTV
PGND
BG2
BOOST2
IN
Voltages ...2.7V to – 0.3V
CC
CC
www.DataSheet4U.com
0.800
0.002
– 0.1
TYP
0.1
– 5
ORDER PART
LTC3728EUH
MARKING
NUMBER
UH PART
0.808
3728
MAX
0.02
– 0.5
– 50
0.5
CC
to – 0.3V
UNITS
3728fb
%/V
nA
%
%
V