LTC1735
ABSOLUTE
AXI U RATI GS
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
PACKAGE/ORDER I FOR ATIO
TOP VIEW
C
OSC
1
RUN/SS 2
I
TH
3
FCB 4
SGND 5
V
OSENSE
6
SENSE
–
7
SENSE
+
8
GN PACKAGE
16-LEAD NARROW
PLASTIC SSOP
16 TG
15 BOOST
14 SW
13 V
IN
12 INTV
CC
11 BG
10 PGND
9
EXTV
CC
ORDER PART
NUMBER
LTC1735CGN
LTC1735CS
LTC1735IGN
LTC1735IS
LTC1735EGN
GN PART MARKING
1735
1735I
1735E
S PACKAGE
16-LEAD PLASTIC SO
T
JMAX
= 125°C,
θ
JA
= 130°C/W (GN)
T
JMAX
= 125°C,
θ
JA
= 110°C/W (S)
Consult LTC marketing for parts specified with wider operating temperature ranges.
The
q
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.
SYMBOL
I
VOSENSE
V
OSENSE
∆V
LINEREG
∆V
LOADREG
PARAMETER
Feedback Current
Feedback Voltage
Reference Voltage Line Regulation
Output Voltage Load Regulation
CONDITIONS
(Note 3)
(Note 3)
V
IN
= 3.6V to 30V (Note 3)
(Note 3)
Measured in Servo Loop; V
ITH
= 0.7V
Measured in Servo Loop; V
ITH
= 2V
In Dropout
q
q
q
q
ELECTRICAL CHARACTERISTICS
Main Control Loop
DF Max
g
m
V
FCB
I
FCB
Maximum Duty Factor
Transconductance Amplifier g
m
Forced Continuous Threshold
Forced Continuous Current
V
FCB
= 0.85V
2
U
U
W
W W
U
W
(Note 1)
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
TOP VIEW
NC
C
OSC
RUN/SS
I
TH
FCB
SGND
V
OSENSE
PGOOD
SENSE
–
1
2
3
4
5
6
7
8
9
20 NC
19 TG
18 BOOST
17 SW
16 V
IN
15 INTV
CC
14 BG
13 PGND
12 EXTV
CC
11 NC
ORDER PART
NUMBER
LTC1735CF
LTC1735IF
SENSE
+
10
F PACKAGE
20-LEAD PLASTIC TSSOP
T
JMAX
= 125°C,
θ
JA
= 110°C/W
MIN
TYP
–4
MAX
– 25
0.808
0.02
0.3
– 0.3
UNITS
nA
V
%/V
%
%
%
mmho
0.792
0.8
0.001
0.1
– 0.1
98
0.76
99.4
1.3
0.8
– 0.17
0.84
– 0.3
V
µA
1735fc
LINER [ LINEAR TECHNOLOGY ]
