LTC1435 Linear Technology, LTC1435 Datasheet - Page 2

• Manufacturer Part Number: LTC1435
• Description: High Efficiency Low Noise Synchronous Step-Down Switching Regulator
• Manufacturer: Linear Technology

ELECTRICAL CHARACTERISTICS
ABSOLUTE
SYMBOL
Main Control Loop
I
V
V
I
V
I
V
I
TG t
TG t
BG t
BG t
Internal V
V
V
V
V
Oscillator
f
LTC1435
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
2
IN
SFB
Q
RUN/SS
OSC
TH
OSENSE
V
V
SFB
OVL
RUN/SS
V
INTVCC
LDO
LDO
EXTVCC
V
LINEREG
LOADREG
SENSE(MAX)
LTC1435C............................................... 0 C to 70 C
LTC1435I............................................ – 40 C to 85 C
, V
r
r
OSENSE
f
f
INT
EXT
CC
CC
OSENSE
+
, Sense
CC
Output Current ........................................ 50mA
Voltage ........................................ 10V to – 0.3V
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
TG Transition Time
BG Transition Time
Internal V
INTV
EXTV
EXTV
Oscillator Frequency
Voltages .............................. 2.7V to – 0.3V
Normal Mode
Shutdown
Rise Time
Fall Time
Rise Time
Fall Time
–
CC
CC
CC
Voltages ......... INTV
Load Regulation
Voltage Drop
Switchover Voltage
W
MAXIMUM
CC
Voltage
IN
)......................... 36V to – 0.3V
W W
RATINGS
CC
+ 0.3V to – 0.3V
IN
U
CONDITIONS
(Note 2)
(Note 2)
V
I
I
V
V
EXTV
3.6V < V
V
V
V
C
C
C
C
6V < V
C
+ 5V to – 5V
TH
TH
I
I
I
IN
SFB
SFB
RUN/SS
RUN/SS
OSENSE
LOAD
LOAD
LOAD
LOAD
INTVCC
INTVCC
INTVCC
OSC
Sinking 5 A (Note 2)
Sourcing 5 A
= 3.6V to 20V (Note 2)
Ramping Negative
= 1.5V
CC
= 100pF (Note 4)
= 3000pF
= 3000pF
= 3000pF
= 3000pF
IN
= 5V (Note 3)
= 15mA, V
= 15mA, V
= 15mA, V
IN
= 0V, 3.6V < V
= 0V
= 0V, 5V
< 30V, V
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
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
MIN
1.16
1.24
130
112
0.8
1.5
4.8
4.5
CC
CC
INFORMATION
U
0.002
– 0.5
– 0.2
1.19
1.19
1.28
TYP
260
150
130
125
1.3
5.0
4.7
– 1
10
16
50
50
50
40
0.5
3
ORDER PART
W
LTC1435CG
LTC1435CS
LTC1435IG
LTC1435IS
1.202
NUMBER
MAX
– 0.8
0.01
1.22
1.32
180
150
150
150
150
230
138
4.5
5.2
– 2
– 1
50
25
0.8
2
UNITS
U
%/V
kHz
mV
mV
nA
ns
ns
ns
ns
%
%
%
V
V
A
V
A
A
V
A
V
V