Datasheet
LTC3728
2
3728fg
ABSOLUTE MAXIMUM RATINGS
Input Supply Voltage (V
IN
) .........................36V to –0.3V
Topside Driver Voltages
(BOOST1, BOOST2) ............................... 42V to –0.3V
Switch Voltage (SW1, SW2) ......................... 36V 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)
PIN CONFIGURATION
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3728EG#PBF LTC3728EG#TRPBF LTC3728EG 28-Lead Plastic SSOP –40°C to 85°C
LTC3728IG#PBF LTC3728IG#TRPBF LTC3728IG 28-Lead Plastic SSOP –40°C to 85°C
LTC3728EUH#PBF LTC3728EUH#TRPBF 3728
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 85°C
LTC3728IUH#PBF LTC3728IUH#TRPBF 3728
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 85°C
LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3728EG LTC3728EG#TR LTC3728EG 28-Lead Plastic SSOP –40°C to 85°C
LTC3728IG LTC3728IG#TR LTC3728IG 28-Lead Plastic SSOP –40°C to 85°C
LTC3728EUH LTC3728EUH#TR 3728
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 85°C
LTC3728IUH LTC3728IUH#TR 3728
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to:
http://www.linear.com/tapeandreel/
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 ................................. 50mA
Operating Temperature Range (Note 7).... –40°C to 85°C
Junction Temperature (Note 2) ............................. 125°C
Storage Temperature Range ................... –65°C to 125°C
Lead Temperature (Soldering, 10 sec)
(G Package Only) .................................................. 300°C
T
JMAX
= 125°C, θ
JA
= 34°C/W
EXPOSED PAD IS SGND (MUST BE SOLDERED TO PCB)
T
JMAX
= 125°C, θ
JA
= 90°C/W - SINGLE LAYER BOARD
68º C/W - 4 LAYER
32
33
31 30 29 28 27 26 25
9 10 11 12 13
TOP VIEW
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
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TOP VIEW
G PACKAGE
28-LEAD 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