Datasheet
LT3435
2
3435fa
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
SHDN
SHDN Threshold 1.15 1.3 1.45 V
I
SHDN
SHDN Input Current SHDN = 12V ● 520 µA
Minimum Input Voltage (Note 3) ● 2.4 3 V
I
VINS
Supply Shutdown Current SHDN = 0V, BOOST = 0V, FB/PGFB = 0V 0.1 2 µA
Supply Sleep Current (Note 4) BIAS = 0V, FB = 1.35V ● 170 250 µA
FB = 1.35V
● 45 75 µA
I
VIN
Supply Quiescent Current BIAS = 0V, FB = 1.15V 3.3 7 mA
BIAS = 5V, FB = 1.15V 2.6 6 mA
Minimum BIAS Voltage (Note 5) ● 2.7 3.1 V
I
BIASS
BIAS Sleep Current (Note 4) ● 125 180 µA
I
BIAS
BIAS Quiescent Current SYNC = 3.3V 700 900 µA
Minimum Boost Voltage (Note 6) I
SW
= 1.5A 1.8 V
Input Boost Current (Note 7) I
SW
= 3A 65 85 mA
V
REF
Reference Voltage (V
REF
) 3.3V < V
VIN
< 60V ● 1.225 1.25 1.275 V
I
FB
FB Input Bias Current 75 200 nA
EA Voltage Gain (Note 8) 900 V/V
EA Voltage g
m
dI(V
C
)= ±10µA 400 650 900 µMho
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
ELECTRICAL CHARACTERISTICS
(Note 1)
V
IN
, SHDN, BIAS, PGOOD, SW ............................... 60V
BOOST Pin Above SW ............................................ 35V
BOOST Pin Voltage ................................................. 68V
SYNC, C
SS
, PGFB, FB................................................ 6V
Operating JunctionTemperature Range
(Note 2) ........................................... –40°C to 125°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
J
= 25°C. V
IN
= 12V, SHDN = 12V, BIAS = 5V, FB/PGFB = 1.25V, C
SS
/SYNC = 0V
unless otherwise noted.
T
JMAX
= 125°C, θ
JA
= 45°C/W, θ
JC(PAD)
= 10°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO GND (PIN 8)
FE PART MARKING
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
ORDER PART NUMBER
LT3435EFE
LT3435IFE
3435EFE
3435IFE
FE PACKAGE
16-LEAD PLASTIC TSSOP
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
NC
SW
V
IN
V
IN
SW
BOOST
C
T
GND
PGOOD
SHDN
SYNC
PGFB
FB
V
C
BIAS
C
SS
17