Datasheet

2
LTC1735
1735fc
ABSOLUTE AXI U RATI GS
W
WW
U
Input Supply Voltage (V
IN
).........................36V to –0.3V
Topside Driver Supply Voltage (BOOST)....42V to –0.3V
Switch Voltage (SW) ....................................36V to –5V
EXTV
CC
Voltage ...........................................7V to –0.3V
Boosted Driver Voltage (BOOST – SW) .......7V to –0.3V
SENSE
+
, SENSE
–
Voltages ..........1.1 (INTV
CC
) to –0.3V
FCB Voltage ............................(INTV
CC
+ 0.3V) to –0.3V
I
TH
, V
OSENSE
Voltages ...............................2.7V to –0.3V
RUN/SS, PGOOD (LTC1735F Only)
Voltages.......................................................7V to –0.3V
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 15V, V
RUN/SS
= 5V unless otherwise noted.
Peak Driver Output Current <10µs (TG, BG) .............. 3A
INTV
CC
Output Current ......................................... 50mA
Operating Ambient Temperature Range
LTC1735C ............................................... 0°C to 85°C
LTC1735I/LTC1735E (Note 8) ............ –40°C to 85°C
Junction Temperature (Note 2)............................. 125°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)..................300°C
(Note 1)
PACKAGE/ORDER I FOR ATIO
UUW
ORDER PART
NUMBER
LTC1735CGN
LTC1735CS
LTC1735IGN
LTC1735IS
LTC1735EGN
T
JMAX
= 125°C, θ
JA
= 130°C/W (GN)
T
JMAX
= 125°C, θ
JA
= 110°C/W (S)
TOP VIEW
S PACKAGE
16-LEAD PLASTIC SO
GN PACKAGE
16-LEAD NARROW
PLASTIC SSOP
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
C
OSC
RUN/SS
I
TH
FCB
SGND
V
OSENSE
SENSE
–
SENSE
+
TG
BOOST
SW
V
IN
INTV
CC
BG
PGND
EXTV
CC
GN PART MARKING
1735
1735I
1735E
Consult LTC marketing for parts specified with wider operating temperature ranges.
ORDER PART
NUMBER
LTC1735CF
LTC1735IF
T
JMAX
= 125°C, θ
JA
= 110°C/W
1
2
3
4
5
6
7
8
9
10
TOP VIEW
F PACKAGE
20-LEAD PLASTIC TSSOP
20
19
18
17
16
15
14
13
12
11
NC
C
OSC
RUN/SS
I
TH
FCB
SGND
V
OSENSE
PGOOD
SENSE
–
SENSE
+
NC
TG
BOOST
SW
V
IN
INTV
CC
BG
PGND
EXTV
CC
NC
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Main Control Loop
I
VOSENSE
Feedback Current (Note 3) –4 –25 nA
V
OSENSE
Feedback Voltage (Note 3) ● 0.792 0.8 0.808 V
∆V
LINEREG
Reference Voltage Line Regulation V
IN
= 3.6V to 30V (Note 3) 0.001 0.02 %/V
∆V
LOADREG
Output Voltage Load Regulation (Note 3)
Measured in Servo Loop; V
ITH
= 0.7V ● 0.1 0.3 %
Measured in Servo Loop; V
ITH
= 2V ● –0.1 –0.3 %
DF Max Maximum Duty Factor In Dropout 98 99.4 %
g
m
Transconductance Amplifier g
m
1.3 mmho
V
FCB
Forced Continuous Threshold ● 0.76 0.8 0.84 V
I
FCB
Forced Continuous Current V
FCB
= 0.85V – 0.17 –0.3 µA