Datasheet
LTC3850/LTC3850-1
2
38501fc
ABSOLUTE MAXIMUM RATINGS
Input Supply Voltage (V
IN
) ......................... 28V to –0.3V
Input Supply Voltage (V
IN
),
LTC3850I Only .......................................30V to –0.3V
Input Supply Transient Voltage (V
IN
) < 500ms, with
INTV
CC
≥ 5V, LTC3850I Only ...................34V to –0.3V
Top Side Driver Voltages
BOOST1, BOOST2 ..................................34V to –0.3V
Switch Voltage (SW1, SW2)
.........................28V to –5V
Switch Voltage (SW1, SW2),
LTC3850I Only
..........................................30V to –5V
INTV
CC
, RUN1, RUN2, PGOOD, EXTV
CC
,
(BOOST1-SW1), (BOOST2-SW2)
.................6V to –0.3V
(Note 1)
SENSE1
+
, SENSE2
+
, SENSE1
–
,
SENSE2
–
Voltages .....................................5.5V to –0.3V
MODE/PLLIN, I
LIM
,TK/SS1,TK/SS2, FREQ/PLLFLTR
Voltages
................................................ INTV
CC
to –0.3V
I
TH1
, I
TH2
, V
FB1
, V
FB2
Voltages .................. 2.7V to –0.3V
INTV
CC
Peak Output Current ................................100mA
Operating Temperature Range (Note 2)....–40°C to 85°C
Junction Temperature (Note 3)
............................. 125°C
Storage Temperature Range
...................–65°C to 125°C
Lead Temperature (Soldering, 10 sec)
(GN Package)
.................................................... 300°C
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TOP VIEW
GN PACKAGE
28-LEAD NARROW PLASTIC SSOP
28
27
26
25
24
23
22
21
20
19
18
17
16
15
RUN1
SENSE1
+
SENSE1
–
TK/SS1
I
TH1
V
FB1
SGND
V
FB2
I
TH2
TK/SS2
SENSE2
–
SENSE2
+
RUN2
I
LIM
(EXTV
CC
)*
FREQ/PLLFLTR
MODE/PLLIN
SW1
TG1
BOOST1
BG1
V
IN
INTV
CC
BG2
PGND
BOOST2
TG2
SW2
PGOOD
T
JMAX
= 125°C, θ
JA
= 95°C/W
*PIN 14 = I
LIM
FOR LTC3850GN, EXTV
CC
FOR LTC3850GN-1
28 27 26 25 24 23
8 9
TOP VIEW
29
UF PACKAGE
28-LEAD (4mm × 4mm) PLASTIC QFN
10
11 12 13 14
TK/SS1
I
TH1
V
FB1
V
FB2
I
TH2
TK/SS2
SENSE2
–
BOOST1
BG1
V
IN
INTV
CC
BG2
PGND
BOOST2
SENSE1
–
SENSE1
+
RUN1
FREQ/PLLFLTR
MODE/PLLIN
SW1
TG1
SENSE2
+
RUN2
I
LIM
EXTV
CC
PGOOD
SW2
TG2
16
15
17
18
19
20
21
6
7
5
4
3
2
1
22
T
JMAX
= 125°C, θ
JA
= 37°C/W, θ
JC
= 2.6°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
9 10
TOP VIEW
UFD PACKAGE
28-LEAD (4mm × 5mm) PLASTIC QFN
11 12 13
28 27 26 25 24
14
23
6
5
4
3
2
1
SENSE1
–
TK/SS1
ITH1
VFB1
VFB2
ITH2
TK/SS2
SENSE2
–
BOOST1
BG1
VIN
INTV
CC
BG2
PGND
BOOST2
TG2
SENSE1
+
RUN1
FREQ/PLLFLTR
MODE/PLLIN
SW1
TG1
SENSE2
+
RUN2
ILIM
EXTV
CC
PGOOD
SW2
7
17
18
19
20
21
22
16
8
15
29
T
JMAX
= 125°C, θ
JA
= 34°C/W, EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
PIN CONFIGURATION