LTC1435A Linear Technology, LTC1435A Datasheet - Page 2

• Manufacturer Part Number: LTC1435A
• Description: High Efficiency Low Noise Synchronous Step-Down Switching Regulator
• Manufacturer: Linear Technology

ABSOLUTE
LTC1435A
Input Supply Voltage (V
Topside Driver Supply Voltage (BOOST)....42V to – 0.3V
Switch Voltage (SW)............................. V
EXTV
SENSE
I
SFB, Run/SS Voltages .............................. 10V to – 0.3V
Peak Driver Output Current < 10 s (TG, BG) ............. 2A
INTV
Operating Ambient Temperature Range
Junction Temperature (Note 1)............................. 125 C
Storage Temperature Range ................. – 65 C to 150 C
Lead Temperature (Soldering, 10 sec).................. 300 C
ELECTRICAL CHARACTERISTICS
SYMBOL
Main Control Loop
I
V
V
I
V
I
V
I
t
TG t
TG t
BG t
BG t
Internal V
V
V
V
V
2
IN
SFB
Q
RUN/SS
ON(MIN)
TH
OSENSE
SFB
OVL
RUN/SS
INTVCC
LDO
LDO
EXTVCC
V
V
V
V
LINEREG
LOADREG
SENSE(MAX)
LTC1435AC ............................................ 0 C to 70 C
LTC1435AI ......................................... – 40 C to 85 C
, V
r
OSENSE
r
f
f
INT
EXT
CC
CC
OSENSE
+
CC
Output Current ........................................ 50mA
Voltage ........................................ 10V to – 0.3V
, SENSE
Regulator
PARAMETER
Feedback Current
Feedback Voltage
Reference Voltage Line Regulation
Output Voltage Load Regulation
Secondary Feedback Threshold
Secondary Feedback Current
Output Overvoltage Lockout
Input DC Supply Current
Run Pin Threshold
Soft Start Current Source
Maximum Current Sense Threshold
Minimum On-Time
TG Transition Time
BG Transition Time
Internal V
INTV
EXTV
EXTV
Voltages .............................. 2.7V to – 0.3V
Normal Mode
Shutdown
Rise Time
Fall Time
Rise Time
Fall Time
CC
CC
CC
–
W
Load Regulation
MAXIMUM
Voltages ...... INTV
Voltage Drop
Switchover Voltage
CC
Voltage
IN
)......................... 36V to – 0.3V
W W
RATINGS
CC
+ 0.3V to – 0.3V
IN
U
+ 5V to – 5V
CONDITIONS
(Note 2)
(Note 2)
V
I
I
V
V
EXTV
3.6V < V
V
V
V
Tested with Square Wave, SENSE
C
C
C
C
6V < V
I
I
I
TH
TH
INTVCC
INTVCC
INTVCC
IN
SFB
SFB
RUN/SS
RUN/SS
OSENSE
V
LOAD
LOAD
LOAD
LOAD
SENSE
Sinking 5 A (Note 2)
Sourcing 5 A
= 3.6V to 20V (Note 2)
Ramping Negative
= 1.5V
CC
IN
= 3000pF
= 3000pF
= 3000pF
= 3000pF
= 5V (Note 3)
= 15mA, V
= 15mA, V
= 15mA, V
= 0V, 3.6V < V
= 0V
IN
= 0V, 5V
< 30V, V
= 20mV (Note 5
T
A
< 30V
= 25 C, V
EXTVCC
EXTVCC
EXTVCC
EXTVCC
PACKAGE/ORDER
Consult factory for Military grade parts.
IN
IN
= 4V
< 15V
= 4V
= 5V
Ramping Positive
16-LEAD PLASTIC SSOP
= 15V, V
V
RUN/SS
SENSE
SENSE
OSENSE
SGND
C
G PACKAGE
)
SFB
OSC
I
TH
T
T
–
–
+
JMAX
JMAX
= 1.6V,
RUN/SS
1
2
3
4
5
6
7
8
= 125 C,
= 125 C,
TOP VIEW
= 5V unless otherwise noted.
JA
JA
16-LEAD PLASTIC SO
= 130 C/ W (G)
= 110 C/ W (S)
S PACKAGE
16
15
14
13
12
11
10
9
TG
BOOST
SW
V
INTV
BG
PGND
EXTV
IN
1.178
1.16
1.24
MIN
130
0.8
1.5
4.8
4.5
CC
INFORMATION
CC
U
0.002
– 0.5
– 0.2
1.19
1.19
1.28
TYP
280
150
250
130
1.3
5.0
4.7
10
– 1
16
50
50
50
40
0.5
3
ORDER PART
LTC1435ACG
LTC1435ACS
LTC1435AIG
LTC1435AIS
W
1.202
NUMBER
MAX
0.01
– 0.8
1.22
1.32
180
300
150
150
150
150
230
4.5
5.2
– 2
– 1
50
25
0.8
2
UNITS
U
%/V
mV
mV
nA
ns
ns
ns
ns
ns
%
%
%
V
V
A
V
A
A
V
A
V
V