Datasheet
LT8705
2
8705fb
For more information www.linear.com/LT8705
pin conFiguraTion
absoluTe MaxiMuM raTings
V
CSP
-V
CSN
, V
CSPIN
-V
CSNIN
,
V
CSPOUT
-V
CSNOUT
...................................... –0.3V to 0.3V
SS, CLKOUT, CSP, CSN Voltage ................... –0.3V to 3V
V
C
Voltage (Note 2) ................................... –0.3V to 2.2V
RT, LDO33, FBOUT Voltage .......................... –0.3V to 5V
IMON_IN, IMON_OUT Voltage ..................... –0.3V to 5V
SYNC Voltage ............................................ –0.3V to 5.5V
INTV
CC
, GATEV
CC
Voltage ............................ –0.3V to 7V
V
BOOST1
-V
SW1
, V
BOOST2
-V
SW2
..................... –0.3V to 7V
SWEN, MODE Voltage .................................. –0.3V to 7V
SRVO_FBIN, SRVO_FBOUT Voltage ........... –0.3V to 30V
SRVO_IIN, SRVO_IOUT Voltage ................. –0.3V to 30V
(Note 1)
FBIN, SHDN Voltage ................................... –0.3V to 30V
CSNIN, CSPIN, CSPOUT, CSNOUT Voltage ..–0.3V to 80V
V
IN
, EXTV
CC
Voltage .................................. –0.3V to 80V
SW1, SW2 Voltage ......................................81V (Note 7)
BOOST1, BOOST2 Voltage ......................... –0.3V to 87V
BG1, BG2, TG1, TG2 ........................................... (Note 6)
Operating Junction Temperature Range
LT8705E (Notes 3, 8) ......................... –40°C to 125°C
LT8705I (Notes 3, 8) .......................... –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
FE Package .......................................................300°C
13 14 15 16
TOP VIEW
39
GND
UHF PACKAGE
38-LEAD (5mm × 7mm) PLASTIC QFN
17 18 19
38 37 36 35 34 33 32
24
25
26
27
28
29
30
31
8
7
6
5
4
3
2
1SHDN
CSN
CSP
LDO33
FBIN
FBOUT
IMON_OUT
V
C
SS
CLKOUT
SYNC
RT
CSPOUT
CSNOUT
EXTV
CC
SRVO_FBOUT
SRVO_IOUT
SRVO_IIN
SRVO_FBIN
NC
BOOST1
TG1
SW1
NC
IMON_IN
MODE
SWEN
INTV
CC
V
IN
CSPIN
CSNIN
GND
BG1
GATEV
CC
BG2
BOOST2
TG2
SW2
23
22
21
20
9
10
11
12
T
JMAX
= 125°C, θ
JA
= 34°C/W
EXPOSED PAD (PIN 39) IS GND, MUST BE SOLDERED TO PCB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
TOP VIEW
FE PACKAGE
VARIATION: FE38(31)
38-LEAD PLASTIC TSSOP
38
37
36
34
32
30
28
26
24
22
21
20
39
GND
INTV
CC
MODE
IMON_IN
SHDN
CSN
CSP
LDO33
FBIN
FBOUT
IMON_OUT
V
C
SS
CLKOUT
SYNC
RT
GND
BG1
GATEV
CC
BG2
V
IN
CSPIN
CSNIN
CSPOUT
CSNOUT
EXTV
CC
BOOST1
TG1
SW1
SW2
TG2
BOOST2
T
JMAX
= 125°C, θ
JA
= 25°C/W
EXPOSED PAD (PIN 39) IS GND, MUST BE SOLDERED TO PCB