LTC3731 Linear Technology, LTC3731 Datasheet - Page 2

• Manufacturer Part Number: LTC3731
• Description: Synchronous Buck Switching Regulator Controller
• Manufacturer: Linear Technology

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ELECTRICAL CHARACTERISTICS
ABSOLUTE AXI U RATI GS
LTC3731
Topside Driver Voltages (BOOST
Switch Voltage (SW
Boosted Driver Voltage (BOOST
Peak Output Current <1ms (TG
Supply Voltages (V
Pin Voltage .................................................. 7V to –0.3V
RUN/SS, PLLFLTR, PLLIN, UVADJ,
FCB Voltages ............................................. V
PACKAGE/ORDER I FOR ATIO
Consult LTC Marketing for parts specified with wider operating temperature ranges.
temperature range, otherwise specifications are at T
SYMBOL
Main Control Loop
V
2
REGULATED
SENSE2
SENSE2
SENSE3
PLLFLTR
SENSE1
SENSE1
SENSE3
DIFFOUT
RUN/SS
UVADJ
T
PLLIN
SGND
JMAX
EAIN
V
FCB
IN
IN
I
CC
TH
+
–
+
–
+
–
–
+
= 125°C, θ
36-LEAD PLASTIC SSOP
10
11
12
13
14
15
16
17
18
1
2
3
4
5
6
7
8
9
PARAMETER
Regulated Voltage at IN
G PACKAGE
TOP VIEW
JA
= 95°C/W, θ
W
CC
N
)................................... 32V to –5V
, V
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
JC
DR
= 32°C/W
CLKOUT
PGOOD
BOOST1
TG1
SW1
BOOST2
TG2
SW2
V
BG1
PGND
BG2
BG3
SW3
TG3
BOOST3
PHASMD
SGND2
), PGOOD
DR
W W
+
N
U
N
, BG
N
– SW
) ............ 38V to –0.3V
ORDER PART
N
LTC3731CG
LTC3731IG
) ..................... 5A
NUMBER
N
) .... 7V to –0.3V
W
CONDITIONS
V
LTC3731IG
U
ITH
CC
A
= 1.2V (Note 3)
= 25°C. V
to –0.3V
The
U
●
CC
SENSE1
SENSE1
SENSE2
SENSE2
SENSE3
(Note 1)
DIFFOUT
denotes the specifications which apply over the full operating
= V
EAIN
IN
I
Operating Ambient Temperature Range
LTC3731C .................................................... 0°C to 70°C
LTC3731I ................................................. –40°C to 85°C
Junction Temperature (Note 2) ............................. 125°C
Storage Temperature Range ..................–65°C to 150°C
Lead Temperature G Package (Soldering, 10sec).. 300°C
Peak Body Temperature UH Package ................... 240°C
RUN/SS
–
+
–
+
–
–
TH
EXPOSED PAD (PIN 33) IS SIGNAL GROUND
(SGND) AND MUST BE SOLDERED TO PCB
1
2
3
4
5
6
7
8
Voltage ................................................ 2.4V to –0.3V
32 31 30 29 28 27 26 25
9 10 11 12 13 14 15 16
T
= 5V unless otherwise noted.
JMAX
32-LEAD PLASTIC QFN
= 125°C, θ
UH PACKAGE
33
JA
= 34°C/W
●
●
24
23
22
21
20
19
18
17
0.596
0.594
0.591
MIN
BOOST2
TG2
SW2
V
BG1
PGND
BG2
BG3
CC
0.600
0.600
TYP
ORDER PART
LTC3731CUH
LTC3731IUH
NUMBER
UH PART
NUMBER
3731I
3731
0.604
0.606
0.609
MAX
UNITS
3731fa
V
V
V