Datasheet
LTC3859A
2
3859af
absoluTe MaxiMuM raTings
Bias Input Supply Voltage (V
BIAS
) .............. –0.3V to 40V
Buck Top Side Driver Voltages
(BOOST1, BOOST2) ............................. –0.3V to 46V
Boost Top Side Driver Voltages
(BOOST3) ............................................ –0.3V to 76V
Buck Switch Voltage (SW1, SW2) ................–5V to 40V
Boost Switch Voltage (SW3) ........................–5V to 70V
INTV
CC
, (BOOST1–SW1),
(BOOST2–SW2), (BOOST3–SW3), .......... –0.3V to 6V
RUN1, RUN2, RUN3 .................................... –0.3V to 8V
Maximum Current Sourced Into Pin
from Source >8V...............................................100µA
(Notes 1, 3)
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
I
TH1
V
FB1
SENSE1
+
SENSE1
–
FREQ
PLLIN/MODE
SS3
SENSE3
+
SENSE3
–
V
FB3
I
TH3
SGND
RUN1
RUN2
RUN3
SENSE2
–
SENSE2
+
V
FB2
I
TH2
TRACK/SS1
PGOOD1
TG1
SW1
BOOST1
BG1
SW3
TG3
BOOST3
BG3
V
BIAS
EXTV
CC
INTV
CC
BG2
BOOST2
SW2
TG2
OV3
TRACK/SS2
39
PGND
T
JMAX
= 150°C, q
JA
= 25°C/W
EXPOSED PAD (PIN 39) IS PGND, MUST BE SOLDERED TO PCB
13 14 15 16
TOP VIEW
39
PGND
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
1FREQ
PLLIN/MODE
SS3
SENSE3
+
SENSE3
–
V
FB3
I
TH3
SGND
RUN1
RUN2
RUN3
SENSE2
–
SW1
BOOST1
BG1
SW3
TG3
BOOST3
BG3
V
BIAS
EXTV
CC
INTV
CC
BG2
BOOST2
SENSE1
–
SENSE1
+
V
FB1
I
TH1
TRACK/SS1
PGOOD1
TG1
SENSE2
+
V
FB2
I
TH2
TRACK/SS2
OV3
TG2
SW2
23
22
21
20
9
10
11
12
T
JMAX
= 150°C, q
JA
= 34.7°C/W
EXPOSED PAD (PIN 39) IS PGND, MUST BE SOLDERED TO PCB
pin conFiguraTion
SENSE1
+
, SENSE2
+
, SENSE1
–
SENSE2
–
Voltages .....................................–0.3V to 28V
SENSE3
+
, SENSE3
–
Voltages .....................–0.3V to 40V
FREQ Voltages ......................................–0.3V to INTV
CC
EXTV
CC
....................................................... –0.3V to 14V
I
TH1
, I
TH2
, I
TH3
, V
FB1
, V
FB2
, V
FB3
Voltages ....–0.3V to 6V
PLLIN/MODE, PGOOD1, OV3 Voltages .......–0.3V to 6V
TRACK/SS1, TRACK/SS2, SS3 Voltages .....–0.3V to 6V
Operating Junction Temperature Range (Note 2)
LTC3859AE, LTC3859AI .....................–40°C to 125°C
LTC3859AH ........................................ –40°C to 150°C
LTC3859AMP ..................................... –55°C to 150°C
Storage Temperature Range ..............–65°C to 150°C