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