LTC1435
W W U W
U
W U
ABSOLUTE MAXIMUM RATINGS
PACKAGE/ORDER INFORMATION
Input Supply Voltage (VIN).........................36V to –0.3V
Topside Driver Supply Voltage (Boost)......42V to –0.3V
Switch Voltage (SW)............................. VIN + 5V to –5V
EXTVCC Voltage ........................................ 10V to –0.3V
Sense+, Sense– Voltages ......... INTVCC + 0.3V to –0.3V
ITH, VOSENSE Voltages .............................. 2.7V to –0.3V
SFB, Run/SS Voltages .............................. 10V to –0.3V
Peak Driver Output Current < 10µs (TG, BG) ............. 2A
INTVCC Output Current ........................................ 50mA
Operating Ambient Temperature Range
LTC1435C............................................... 0°C to 70°C
LTC1435I............................................ –40°C to 85°C
Junction Temperature (Note 1)............................. 125°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER PART
TOP VIEW
NUMBER
C
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
TG
OSC
RUN/SS
BOOST
SW
LTC1435CG
LTC1435CS
LTC1435IG
LTC1435IS
I
TH
SFB
V
IN
SGND
INTV
BG
CC
V
OSENSE
–
SENSE
PGND
EXTV
+
SENSE
CC
G PACKAGE
S PACKAGE
16-LEAD PLASTIC SSOP 16-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 130°C/ W (G)
TJMAX = 125°C, θJA = 110°C/ W (S)
Consult factory for Military grade parts.
TA = 25°C, VIN = 15V, VRUN/SS = 5V unless otherwise noted.
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Main Control Loop
I
V
∆V
∆V
V
Feedback Current
Feedback Voltage
Reference Voltage Line Regulation
Output Voltage Load Regulation
(Note 2)
(Note 2)
10
1.19
0.002
0.5
–0.5
50
1.202
0.01
0.8
–0.8
nA
V
%/V
%
%
IN OSENSE
●
1.178
OSENSE
V
= 3.6V to 20V (Note 2)
LINEREG
IN
I
I
Sinking 5µA (Note 2)
Sourcing 5µA
●
●
LOADREG
TH
TH
V
Secondary Feedback Threshold
Secondary Feedback Current
Output Overvoltage Lockout
V
V
Ramping Negative
= 1.5V
●
1.16
1.24
1.19
–1
1.28
1.22
–2
1.32
V
µA
V
SFB
SFB
SFB
I
SFB
V
OVL
I
Input DC Supply Current
Normal Mode
Shutdown
Run Pin Threshold
Soft Start Current Source
Maximum Current Sense Threshold
EXTV = 5V (Note 3)
CC
Q
3.6V < V < 30V
260
16
1.3
3
µA
µA
V
µA
IN
V
= 0V, 3.6V < V < 15V
25
2
4.5
180
RUN/SS
IN
V
I
∆V
●
0.8
1.5
130
RUN/SS
V
V
= 0V
= 0V, 5V
RUN/SS
RUN/SS
OSENSE
150
mV
SENSE(MAX)
TG Transition Time
Rise Time
TG t
TG t
C
C
= 3000pF
= 3000pF
50
50
150
150
ns
ns
r
f
LOAD
LOAD
Fall Time
BG Transition Time
Rise Time
BG t
BG t
C
C
= 3000pF
= 3000pF
50
40
150
150
ns
ns
r
f
LOAD
LOAD
Fall Time
Internal V Regulator
CC
V
V
V
V
Internal V Voltage
6V < V < 30V, V = 4V
EXTVCC
●
●
4.8
5.0
–0.2
130
4.7
5.2
–1
230
V
%
mV
V
INTVCC
CC
IN
INT
EXT
INTV Load Regulation
I
I
I
= 15mA, V
= 15mA, V
= 15mA, V
= 4V
= 5V
Ramping Positive
LDO
LDO
CC
INTVCC
INTVCC
INTVCC
EXTVCC
EXTVCC
EXTVCC
EXTV Voltage Drop
CC
EXTV Switchover Voltage
4.5
EXTVCC
CC
Oscillator
f
Oscillator Frequency
C
= 100pF (Note 4)
OSC
112
125
138
kHz
OSC
2
Linear [ Linear ]
