Datasheet

LTC3731
2
3731fc
ABSOLUTE MAXIMUM RATINGS
Topside Driver Voltages (BOOSTn) ............. 38V to –0.3V
Switch Voltage (SWn)
................................... 32V to –5V
Boosted Driver Voltage (BOOSTn – SWn)
.... 7V to –0.3V
Peak Output Current < 1ms (TGn, BGn)
......................5A
Supply Voltages (V
CC
, V
DR
), PGOOD
Pin Voltage
................................................... 7V to –0.3V
RUN/SS, PLLFLTR, PLLIN, UVADJ,
FCB Voltages
.............................................. V
CC
to –0.3V
SENSE+, SENSE– Voltages
....................... 5.5V to –0.3V
(Note 1)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
TOP VIEW
G PACKAGE
36-LEAD PLASTIC SSOP
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
V
CC
PLLIN
PLLFLTR
FCB
IN
+
IN
–
DIFFOUT
EAIN
SGND
SENSE1
+
SENSE1
–
SENSE2
+
SENSE2
–
SENSE3
–
SENSE3
+
RUN/SS
I
TH
UVADJ
CLKOUT
PGOOD
BOOST1
TG1
SW1
BOOST2
TG2
SW2
V
DR
BG1
PGND
BG2
BG3
SW3
TG3
BOOST3
PHASMD
SGND2
T
JMAX
= 125°C, θ
JA
= 95°C/W, θ
JC
= 32°C/W
32 31 30 29 28 27 26 25
9 10 11 12 13 14 15 16
17
18
19
20
21
22
23
24
33
SGND
8
7
6
5
4
3
2
1IN
–
DIFFOUT
EAIN
SENSE1
+
SENSE1
–
SENSE2
+
SENSE2
–
SENSE3
–
BOOST2
TG2
SW2
V
CC
BG1
PGND
BG2
BG3
IN
+
FCB PLLFLTR PLLIN CLKOUT BOOST1 TG1 SW1
SENSE3
+
RUN/SS
I
TH
UVADJ
PHASMD/PG
BOOST3
TG3
SW3
UH PACKAGE
32-LEAD (5mm
×
5mm) PLASTIC QFN
TOP VIEW
T
JMAX
= 125°C, θ
JA
= 34°C/W
EXPOSED PAD (PIN 33) IS SGND, MUST BE SOLDERED TO PCB
PIN CONFIGURATION
I
TH
Voltage ............................................... 2.4V to –0.3V
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 125°C
Lead Temperature G Package (Soldering, 10 sec).. 300°C
Peak Body Temperature UH Package
................... 240°C