Datasheet

LTC3856
2
3856f
Input Supply Voltage (V
IN
) ......................... 40V to –0.3V
Topside Driver Voltages (BOOSTn) ............ 46V to –0.3V
Switch Voltage (SWn) ................................... 40V to –5V
INTV
CC
, RUN, PGOOD, EXTV
CC
,
(BOOSTn – SWn) ......................................... 6V to –0.3V
SENSEn Voltages ...................................... 5.5V to –0.3V
MODE, PLLIN, ILIM, TK/SS, AVP,
FREQ, ISET Voltages ............................. INTV
CC
to –0.3V
DIFFP, DIFFN, DIFFOUT, PHASMD,
ITEMP Voltages ..................................... INTV
CC
to –0.3V
(Note 1)
absoluTe MaxiMuM raTings
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
TOP VIEW
FE PACKAGE
38-LEAD PLASTIC TSSOP
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
FREQ
RUN
SENSE1
+
SENSE1
–
NC
TK/SS
V
FB
I
TH
SGND
AVP
ITEMP
PHASMD
SENSE2
+
SENSE2–
DIFFP
DIFFN
DIFFOUT
ISET
ILIM
PLLIN
CLKOUT
SW1
TG1
NC
BOOST1
PGND1
BG1
V
IN
INTV
CC
EXTV
CC
BG2
PGND2
NC
BOOST2
TG2
SW2
PGOOD
MODE
39
T
JMAX
= 125°C, θ
JA
= 25°C/W
EXPOSED PAD (PIN 39) IS SGND/PGND, MUST BE SOLDERED TO PCB
32
33
31 30 29 28 27 26 25
9 10 11 12
TOP VIEW
UH PACKAGE
32-LEAD (5mm s 5mm) PLASTIC QFN
13 14 15 16
17
18
19
20
21
22
23
24
8
7
6
5
4
3
2
1TK/SS
V
FB
I
TH
AVP
ITEMP
PHASMD
SENSE2
+
SENSE2
–
BOOST1
BG1
V
IN
INTV
CC
EXTV
CC
BG2
BOOST2
TG2
SENSE1
–
SENSE1
+
RUN FREQ PLLIN CLKOUT SW1 TG1
DIFFP
DIFFN
DIFFOUT
ISET ILIM
MODE
PGOOD
SW2
T
JMAX
= 125°C, θ
JA
= 34°C/W
EXPOSED PAD (PIN 33) IS SGND/PGND, MUST BE SOLDERED TO PCB
pin conFiguraTion
I
TH
, V
FB
Voltages ................................... INTV
CC
to –0.3V
INTV
CC
Peak Output Current ................................100mA
Operating Junction Temperature Range
(Notes 2, 3) ............................................ –40°C to 125°C
Storage Temperature Range ................... –65°C to 125°C
Reflow Peak Body Temperature (UH Package) ...... 260°C
Lead Temperature (Soldering, 10 sec.)
FE Package ............................................................ 300°C