Datasheet

LTC3728L/LTC3728LX
2
3728lxff
absoluTe MaxiMuM raTings
Input Supply Voltage (V
IN
) ........................ 30V to –0.3V
Topside Driver Voltages
(BOOST1, BOOST2) .............................. 36V to –0.3V
Switch Voltage (SW1, SW2) ........................ 30V to –5V
INTV
CC,
EXTV
CC
, RUN/SS1, RUN/SS2,
(BOOST1-SW1), (BOOST2-SW2), PGOOD .... 7V to –0.3V
SENSE1
+
, SENSE2
+
, SENSE1
–
,
SENSE2
–
Voltages ........................ (1.1)INTV
CC
to –0.3V
PLLIN, PLLFLTR, FCB Voltages ............ INTV
CC
to –0.3V
(Note 1)
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
RUN/SS1
SENSE1
+
SENSE1
–
V
OSENSE1
PLLFLTR
PLLIN
FCB
I
TH1
SGND
3.3V
OUT
I
TH2
V
OSENSE2
SENSE2
–
SENSE2
+
PGOOD
TG1
SW1
BOOST1
V
IN
BG1
EXTV
CC
INTV
CC
PGND
BG2
BOOST2
SW2
TG2
RUN/SS2
T
JMAX
= 125°C, θ
JA
= 95°C/W
32 31 30 29 28 27 26 25
9 10 11 12 13
TOP VIEW
33
14 15 16
17
18
19
20
21
22
23
24
8
7
6
5
4
3
2
1V
OSENSE1
PLLFLTR
PLLIN
FCB
I
TH1
SGND
3.3V
OUT
I
TH2
BOOST1
V
IN
BG1
EXTV
CC
INTV
CC
PGND
BG2
BOOST2
NC SENSE1
–
SENSE1
+
NC RUN/SS1 PGOOD TG1 SW1
V
OSENSE2
NC
SENSE2
–
SENSE2
+
RUN/SS2
TG2
SW2
NC
UH PACKAGE
32-LEAD (5mm × 5mm) PLASTIC QFN
T
JMAX
= 125°C, θ
JA
= 34°C/W
EXPOSED PAD IS SGND (PIN 33), MUST BE SOLDERED TO PCB
pin conFiguraTion
I
TH1,
I
TH2
, V
OSENSE1
, V
OSENSE2
Voltages ... 2.7V to –0.3V
Peak Output Current <10µs (TG1, TG2, BG1, BG2) .... 3A
INTV
CC
Peak Output Current ................................. 40mA
Operating Temperature Range (Note 7)
LTC3728LC/LTC3728LXC ........................ 0°C to 85°C
LTC3728LE/LTC3728LI ........................ –40°C to 85°C
Junction Temperature (Note 2) ............................ 125°C
Storage Temperature Range .................. –65°C to 125°C
Reflow Peak Body Temperature (UH Package) ..... 260°C
Lead Temperature (Soldering, 10 sec)
(GN Package) .................................................... 300°C