LTC1735 Linear Technology, LTC1735 Datasheet - Page 2

• Manufacturer Part Number: LTC1735
• Description: High Efficiency Synchronous Step-Down Switching Regulator
• Manufacturer: Linear Technology

LTC1735
ABSOLUTE AXI U RATI GS
(Note 1)
Input Supply Voltage (V
Topside Driver Supply Voltage (BOOST)....42V to – 0.3V
Switch Voltage (SW) ....................................36V to – 5V
EXTV
Boosted Driver Voltage (BOOST – SW) .......7V to – 0.3V
SENSE
FCB Voltage ............................(INTV
I
RUN/SS Voltages .........................................7V to – 0.3V
Peak Driver Output Current <10 s (TG, BG) .............. 3A
INTV
Operating Ambient Temperature Range
Junction Temperature (Note 2) ............................. 125 C
Storage Temperature Range ................. – 65 C to 150 C
Lead Temperature (Soldering, 10 sec).................. 300 C
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
SYMBOL
Main Control Loop
I
V
DF Max
g
V
I
V
I
V
V
I
I
UVLO
2
VOSENSE
FCB
Q
RUN/SS
SCL
TH
m
OSENSE
FCB
OVL
RUN/SS
RUN/SS
V
V
V
LINEREG
LOADREG
SENSE(MAX)
LTC1735C ............................................... 0 C to 85 C
LTC1735I ............................................ – 40 C to 85 C
, V
CC
CC
OSENSE
+
Output Current ......................................... 50mA
, SENSE
Voltage ...........................................7V to – 0.3V
Voltages ...............................2.7V to – 0.3V
PARAMETER
Feedback Current
Feedback Voltage
Reference Voltage Line Regulation
Output Voltage Load Regulation
Maximum Duty Factor
Transconductance Amplifier g
Forced Continuous Threshold
Forced Continuous Current
Feedback Overvoltage Lockout
Input DC Supply Current
Run Pin Start Threshold
Run Pin Begin Latchoff Threshold
Soft-Start Charge Current
RUN/SS Discharge Current
Undervoltage Lockout
Maximum Current Sense Threshold
Normal Mode
Shutdown
–
W
Voltages .......... 1.1 (INTV
IN
).........................36V to – 0.3V
W W
m
CC
+ 0.3V) to – 0.3V
CC
U
A
CONDITIONS
(Note 3)
(Note 3)
V
(Note 3)
Measured in Servo Loop; V
Measured in Servo Loop; V
In Dropout
V
(Note 4)
V
V
V
V
Soft Short Condition, V
V
Measured at V
V
) to – 0.3V
IN
FCB
RUN/SS
RUN/SS
RUN/SS
RUN/SS
RUN/SS
OSENSE
= 25 C. V
= 3.6V to 30V (Note 3)
= 0.85V
The
, Ramping Positive
, Ramping Positive
= 0V
= 0V
= 4.5V
= 0.7V
IN
denotes specifications which apply over the full operating
IN
= 15V, V
Pin (V
PACKAGE/ORDER I FOR ATIO
Consult factory for Military grade parts.
IN
OSENSE
V
16-LEAD NARROW
RUN/SS
SENSE
SENSE
OSENSE
RUN/SS
Ramping Down)
PLASTIC SSOP
SGND
GN PACKAGE
C
ITH
ITH
FCB
OSC
I
T
T
TH
JMAX
JMAX
–
+
= 0.5V,
= 0.7V
= 2V
1
2
3
4
5
6
7
8
= 5V unless otherwise noted.
= 125 C,
= 125 C,
TOP VIEW
JA
JA
16-LEAD PLASTIC SO
= 130 C/W (GN)
= 110 C/W (S)
S PACKAGE
16
15
14
13
12
11
10
9
TG
BOOST
SW
V
INTV
BG
PGND
EXTV
IN
0.792
– 0.7
0.76
0.84
MIN
CC
1.0
0.5
CC
98
60
U
GN PART MARKING
– 0.17
0.001
– 0.1
99.4
0.86
– 1.2
TYP
450
0.8
1.3
0.8
1.5
4.1
3.5
– 4
15
75
0.1
2
ORDER PART
LTC1735CGN
LTC1735CS
LTC1735IGN
LTC1735IS
NUMBER
W
1735
1735I
0.808
MAX
0.02
– 0.3
0.84
– 0.3
0.88
– 25
1.9
4.5
3.9
25
85
0.3
4
UNITS
mmho
U
%/V
mV
nA
%
%
%
V
V
A
V
A
A
V
V
A
A
V