LTC1735I-1 Linear Technology, LTC1735I-1 Datasheet - Page 2

• Manufacturer Part Number: LTC1735I-1
• Description: High Efficiency Synchronous Step-Down Switching Regulator
• Manufacturer: Linear Technology

LTC1735-1
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
INTV
SENSE
PGOOD Voltages ................ 1.1(INTV
I
RUN/SS Voltage ....................(INTV
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
I
UVLO
I
t
2
VOSENSE
Q
RUN/SS
SCL
SENSE
ON(MIN)
TH
m
OSENSE
OVL
RUN/SS
V
V
V
LINEREG
LOADREG
SENSE(MAX)
LTC1735C-1 ............................................ 0 C to 85 C
LTC1735I-1 ........................................ – 40 C to 85 C
, V
CC
CC
OSENSE
, EXTV
+
Output Current ......................................... 50mA
, SENSE
, C
PARAMETER
Feedback Current
Feedback Voltage
Reference Voltage Line Regulation
Output Voltage Load Regulation
Maximum Duty Factor
Transconductance Amplifier g
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
SENSE Pins Total Source Current
Minimum On-Time
CC
OSC
–
Normal Mode
Shutdown
(BOOST, SW) Voltages ..... 7V to – 0.3V
,
W
Voltages .....................2.7V to – 0.3V
IN
)........................ 36V to – 0.3V
W W
CC
m
CC
+ 0.3V) to – 0.3V
+ 0.3V) to – 0.3V
CONDITIONS
(Note 3)
(Note 3)
V
(Note 3)
Measured in Servo Loop; V
Measured in Servo Loop; V
In Dropout
(Note 5)
3.6V < V
V
V
V
V
Soft Short Condition, V
V
Measured at V
V
V
Tested with a Square Wave (Note 4)
U
IN
RUN/SS
RUN/SS
RUN/SS
RUN/SS
RUN/SS
OSENSE
SENSE
A
= 25 C. V
= 3.6V to 30V (Note 3)
–
, Ramping Positive
, Ramping Positive
IN
= 0V
= 0V
= 4.5V
= V
The
= 0.7V
< 30V
SENSE
IN
IN
denotes specifications which apply over the full operating
Pin (Ramping Negative)
= 15V, V
+
= 0V
PACKAGE/ORDER I FOR ATIO
Consult factory for Military grade parts.
OSENSE
16-LEAD PLASTIC SSOP
V
RUN/SS
SENSE
SENSE
RUN/SS
ITH
ITH
PGOOD
OSENSE
GN PACKAGE
SGND
C
T
T
OSC
JMAX
JMAX
= 0.7V
= 2V
= 0.5V,
I
TH
–
+
= 125 C,
= 125 C,
= 5V unless otherwise noted.
1
2
3
4
5
6
7
8
TOP VIEW
JA
JA
= 130 C/W (GN)
= 110 C/W (S)
16-LEAD PLASTIC SO
S PACKAGE
16
15
14
13
12
11
10
9
TG
BOOST
SW
V
INTV
BG
PGND
EXTV
IN
0.792
– 0.7
0.84
MIN
1.0
0.5
98
60
CC
CC
U
0.001
– 0.1
99.4
0.86
– 1.2
TYP
450
160
0.8
1.3
1.5
4.1
3.5
– 4
15
75
60
0.1
2
LTC1735CGN-1
LTC1735CS-1
LTC1735IGN-1
LTC1735IS-1
ORDER PART
NUMBER
W
0.808
MAX
0.02
– 0.3
0.88
– 25
200
1.9
4.5
3.9
25
85
80
0.3
4
UNITS
mmho
U
%/V
mV
nA
ns
%
%
%
V
V
A
A
V
V
A
A
V
A